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Shinji Morimoto

Section

Graduate School of Science

Job title

Professor

Degree

博士（理学）（東北大学）
理学修士（東北大学）

researchmap

https://researchmap.jp/7000006982

J-GLOBAL ID

201401032278586550

Committee Memberships 18

宮城県公害審査会　委員

2025/04 - Present
宇宙科学研究所　大気球専門委員会委員

2024/10 - Present
気象庁　品質評価懇談会委員

2023/10 - Present
南極観測統合推進本部委員

2022 - Present
国立極地研究所運営委員会　委員

2020/04 - Present
仙台市　環境影響評価審査会委員

2020 - Present
気象庁温室効果ガス観測標準化共同プログラム　メンバー

2017/04 - Present
日航財団航空機による大気観測データ利用委員会　委員

2017/04 - Present
日本気象学会論文誌SOLA編集委員会　委員

2014/04 - Present
日本学術会議IGBP・WCRP・DIVERSITAS合同分科会IGAC小委員会　委員

2013/04 - Present
国立極地研究所南極観測審議委員会　委員長

2022/05 - 2024/04
日本大気化学会監事

2021/07 - 2023/06
国立極地研究所南極観測審議委員会　副委員長

2020/04 - 2022/03
国立極地研究所南極観測審議委員会気水圏専門部会　部会長

2019/04 - 2022/03
日本大気化学会　運営委員

2017/07 - 2021/06
国立極地研究所南極観測審議委員会気水圏専門部会　副部会長

2014/04 - 2019/03
国立環境研究所温室効果ガス観測データ標準化ワーキンググループ　委員

2011/04 - 2017/03
北極環境研究コンソーシアム体制検討ワーキンググループ　委員

2014/09 - 2015/03

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Research Interests 1

Atmospheric Science

Research Areas 1

Natural sciences / Atmospheric and hydrospheric science /

Awards 1

日本気象学会山本・正野論文賞

1995/05　日本気象学会

Papers 127

Firn air composition at the H128 and NDFN sites, Dronning Maud Land, East Antarctica, Peer-reviewed

Oyabu, I., K. Kawamura, K. Kitamura, S. Sugawara, S. Ishidoya, T. Umezawa, T. Saito, D. Goto, R. Fujita, S. Morimoto, S. Aoki, H. Motoyama

Polar Data Journal　9　30-43　2025/05

DOI： 10.20575/00000061 　
New estimates of stratospheric age of air from halocarbon measurements of air samples collected by a balloon-borne cryogenic air sampler over Japan Peer-reviewed

Taku Umezawa, Satoshi Sugawara, Shoko Hikichi, Shinji Morimoto, Takuya Saito, Paul B Krummel, Paul J. Fraser, Ray F Weiss

SOLA　2025/05

DOI： 10.2151/sola.2025-029 　
Global Fossil Methane Emissions Constrained by Multi‐Isotopic Atmospheric Methane Histories Peer-reviewed

Ryo Fujita, Heather Graven, Giulia Zazzeri, Benjamin Hmiel, Vasilii V. Petrenko, Andrew M. Smith, Sylvia E. Michel, Shinji Morimoto

Journal of Geophysical Research: Atmospheres　130　(5)　2025/02/28
Publisher: American Geophysical Union (AGU)
DOI： 10.1029/2024jd041266 　

ISSN： 2169-897X

eISSN： 2169-8996

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Abstract The global CH₄ budget of sources and sinks is highly uncertain, particularly the emissions from specific sources such as fossil fuels (FF) or agriculture. Here, we estimate plausible global CH₄ source and sink scenarios using historical observations and simulations of atmospheric CH₄ mole fraction and its stable isotopic (δ¹³C‐CH₄, δD‐CH₄) and radiocarbon (Δ¹⁴C‐CH₄) composition, combining constraints from all these tracers for the first time. We employ a one‐box model along with a Monte Carlo particle filter technique, explicitly exploring the impact of each isotopic constraints and uncertainties in prior CH₄ source and sink parameters on posterior sectorial source fractions. We find our posterior anthropogenic FF emissions at the global scale are 30% lower than previous isotope‐based studies. Our analysis suggests previous δ¹³C‐CH₄‐based studies are potentially biased because the current database‐derived estimate of the global mean biogenic δ¹³C‐CH₄ source signature is too low and/or current sink‐weighted total carbon kinetic isotope effect is underestimated. We find modern atmospheric Δ¹⁴C‐CH₄ data constrains lower global FF emissions after 1980s, which is contrary to the most recent finding that utilized atmospheric Δ¹⁴C‐CH₄ data, but supported by an independent estimate of global nuclear ¹⁴CH₄ emissions. Our multi‐isotopic constraints align with CH₄‐only inversion results, while reducing their uncertainties with greater robustness against different prior emission scenarios. We find strong constraints not only on FF emissions but also other key sources and sinks, showing that long‐term multi‐isotopic observations are critical for refining the global CH₄ budget and developing effective CH₄ emission mitigation strategies.
Increasing Methane Emissions and Widespread Cold‐Season Release From High‐Arctic Regions Detected Through Atmospheric Measurements Peer-reviewed

Rebecca H. Ward, Colm Sweeney, John B. Miller, Mathias Goeckede, Tuomas Laurila, Juha Hatakka, Viktor Ivakov, Motoki Sasakawa, Toshinobu Machida, Shinji Morimoto, Daisuke Goto, Anita L. Ganesan

Journal of Geophysical Research: Atmospheres　129　(11)　2024/06/03
Publisher: American Geophysical Union (AGU)
DOI： 10.1029/2024jd040766 　

ISSN： 2169-897X

eISSN： 2169-8996

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Abstract Rising Arctic temperatures pose a threat to the large carbon stores trapped in Arctic permafrost. To assess methane emissions in high‐Arctic regions, we analyzed atmospheric data from Alaska and Siberia using two methods: (a) a wind sector approach to calculate emission changes based on concentration enhancements using wind direction, and (b) an inversion method utilizing a high‐resolution atmospheric transport model. Incorporating data after 2015, we observed a significant rise in methane emissions (0.018 ± 0.005 Tg yr⁻² from 2000 to 2021) from Alaska's North Slope, indicating a shift from previous analyses. We find 34%–50% of yearly emissions occurred in the late season (September–December) consistently across multiple years and regions, which is historically underestimated in models and inventories. Our findings reveal significant changes occurring in the Arctic, highlighting the crucial role of long‐term atmospheric measurements in monitoring the region, especially during the cold season.
Methane emissions decreased in fossil fuel exploitation and sustainably increased in microbial source sectors during 1990–2020 Peer-reviewed

Naveen Chandra, Prabir K. Patra, Ryo Fujita, Lena Höglund-Isaksson, Taku Umezawa, Daisuke Goto, Shinji Morimoto, Bruce H. Vaughn, Thomas Röckmann

Communications Earth and Environment　5　(1)　2024/04/17
Publisher: Springer Science and Business Media LLC
DOI： 10.1038/s43247-024-01286-x 　

eISSN： 2662-4435

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Abstract Methane (CH₄) emission reduction to limit warming to 1.5 °C can be tracked by analyzing CH₄ concentration and its isotopic composition (δ¹³C, δD) simultaneously. Based on reconstructions of the temporal trends, latitudinal, and vertical gradient of CH₄ and δ¹³C from 1985 to 2020 using an atmospheric chemistry transport model, we show (1) emission reductions from oil and gas exploitation (ONG) since the 1990s stabilized the atmospheric CH₄ growth rate in the late 1990s and early 2000s, and (2) emissions from farmed animals, waste management, and coal mining contributed to the increase in CH₄ since 2006. Our findings support neither the increasing ONG emissions reported by the EDGARv6 inventory during 1990–2020 nor the large unconventional emissions increase reported by the GAINSv4 inventory since 2006. Total fossil fuel emissions remained stable from 2000 to 2020, most likely because the decrease in ONG emissions in some regions offset the increase in coal mining emissions in China.
Estimating emissions of methane consistent with atmospheric measurements of methane and δ¹³C of methane Peer-reviewed

Sourish Basu, Xin Lan, Edward Dlugokencky, Sylvia Michel, Stefan Schwietzke, John B. Miller, Lori Bruhwiler, Youmi Oh, Pieter P. Tans, Francesco Apadula, Luciana V. Gatti, Armin Jordan, Jaroslaw Necki, Motoki Sasakawa, Shinji Morimoto, Tatiana Di Iorio, Haeyoung Lee, Jgor Arduini, Giovanni Manca

Atmospheric Chemistry and Physics　22　(23)　15351-15377　2022/12/05
Publisher: Copernicus GmbH
DOI： 10.5194/acp-22-15351-2022 　

eISSN： 1680-7324

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Abstract. We have constructed an atmospheric inversion framework based on TM5-4DVAR to jointly assimilate measurements of methane and δ13C of methane in order to estimate source-specific methane emissions. Here we present global emission estimates from this framework for the period 1999–2016. We assimilate a newly constructed, multi-agency database of CH4 and δ13C measurements. We find that traditional CH4-only atmospheric inversions are unlikely to estimate emissions consistent with atmospheric δ13C data, and assimilating δ13C data is necessary to derive emissions consistent with both measurements. Our framework attributes ca. 85 % of the post-2007 growth in atmospheric methane to microbial sources, with about half of that coming from the tropics between 23.5∘ N and 23.5∘ S. This contradicts the attribution of the recent growth in the methane budget of the Global Carbon Project (GCP). We find that the GCP attribution is only consistent with our top-down estimate in the absence of δ13C data. We find that at global and continental scales, δ13C data can separate microbial from fossil methane emissions much better than CH4 data alone, and at smaller scales this ability is limited by the current δ13C measurement coverage. Finally, we find that the largest uncertainty in using δ13C data to separate different methane source types comes from our knowledge of atmospheric chemistry, specifically the distribution of tropospheric chlorine and the isotopic discrimination of the methane sink.
Estimated regional CO2 flux and uncertainty based on an ensemble of atmospheric CO2 inversions Peer-reviewed

Naveen Chandra, Prabir K. Patra, Yousuke Niwa, Akihiko Ito, Yosuke Iida, Daisuke Goto, Shinji Morimoto, Masayuki Kondo, Masayuki Takigawa, Tomohiro Hajima, Michio Watanabe

Atmospheric Chemistry and Physics　22　(14)　9215-9243　2022/07/18

DOI： 10.5194/acp-22-9215-2022 　

ISSN： 1680-7316

eISSN： 1680-7324
Supplementary material to "Estimated regional CO2 flux and uncertainty based on an ensemble of atmospheric CO2 inversions" Peer-reviewed

Naveen Chandra, Prabir K. Patra, Yousuke Niwa, Akihiko Ito, Yosuke Iida, Daisuke Goto, Shinji Morimoto, Masayuki Kondo, Masayuki Takigawa, Tomohiro Hajima, Michio Watanabe

2021/12/22
Publisher: Copernicus {GmbH}
DOI： 10.5194/acp-2021-1039-supplement
Composition of firn air at the North Greenland Ice Core Project (NGRIP) site Peer-reviewed

Kawamura, K, T. Umezawa, S. Sugawara, S. Ishidoya, K. Ishijima, T. Saito, I. Oyabu, S. Murayama, S. Morimoto, S. Aoki, T. Nakazawa

Polar Data Journal　5　89-98　2021/09

DOI： 10.20575/00000030 　

ISSN： 2432-6771
Ship-board observations of atmospheric O2/N2 ratio in the Southern Ocean in the austral summer 2017-2018 Peer-reviewed

Morimoto, S, S. Takebayashi, D. Goto, G. Hashida, S. Aoki

Polar Science　29　2021/09

DOI： 10.1016/j.polar.2021.100691 　
Fractionation of O2/N2 and Ar/N2 in the Antarctic ice sheet during bubble formation and bubble-clathrate hydrate transition from precise gas measurements of the Dome Fuji ice core Peer-reviewed

Ikumi Oyabu, Kenji Kawamura, Tsutomu Uchida, Shuji Fujita, Kyotaro Kitamura, Motohiro Hirabayashi, Shuji Aoki, Shinji Morimoto, Takakiyo Nakazawa, Jeffrey P. Severinghaus, Jacob Morgan

The Cryosphere　15　5529-5555　2021/06/15
Publisher: Copernicus GmbH
DOI： 10.5194/tc-2021-147 　

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Abstract. The variations of δO2/N2 and δAr/N2 in the Dome Fuji ice core were measured from 112 m (bubbly ice) to 2001 m (clathrate hydrate ice) at high precision. Our method, combined with the low storage temperature of the samples (−50 °C), successfully excludes post-coring gas-loss fractionation signals from our data. From the bubbly ice to the middle of the bubble-clathrate transition zone (BCTZ) (112–800 m) and below the BCTZ (> 1200 m), the δO2/N2 and δAr/N2 data exhibit orbital-scale variations similar to local summer insolation. The data in the lower BCTZ (800–1200 m) have large scatters, which may be caused by mm-scale inhomogeneity of air composition combined with finite sample lengths. The insolation signal originally recorded at the bubble close-off remains through the BCTZ, and the insolation signal may be reconstructed by analyzing long ice samples. In the clathrate hydrate zone, the scatters around the orbital-scale variability decrease with depth, indicating diffusive smoothing of δO2/N2 and δAr/N2. A simple gas diffusion model was used to reproduce the smoothing and thus constrain their permeation coefficients. The relationship between δAr/Ν2 and δO2/N2 is markedly different for the datasets representing bubble close-off (slope ~0.5), bubble-clathrate hydrate transformation (~1), and post-coring gas-loss (~0.2), suggesting that the contribution of the mass-independent and mass-dependent fractionation processes are different for those cases. The method and data presented here may be useful for improving the orbital dating of deep ice cores over the multiple glacial cycles and further studying non-insolation-driven signals (e.g., atmospheric composition) of these gases.
Distribution and Production Mechanisms of N 2 O in the Western Arctic Ocean Peer-reviewed

Sakae Toyoda, Takahito Kakimoto, Kushi Kudo, Naohiro Yoshida, Daisuke Sasano, Naohiro Kosugi, Masao Ishii, Sohiko Kameyama, Mahomi Inagawa, Hisayuki Yoshikawa‐Inoue, Shigeto Nishino, Akihiko Murata, Shigeyuki Ishidoya, Shinji Morimoto

Global Biogeochemical Cycles　35　(4)　2021/04
Publisher: American Geophysical Union (AGU)
DOI： 10.1029/2020gb006881 　

ISSN： 0886-6236

eISSN： 1944-9224
Estimation of CH4 emissions from the East Siberian Arctic Shelf based on atmospheric observations aboard the R/V Mirai during fall cruises from 2012 to 2017 Peer-reviewed

Yasunori Tohjima, Jiye Zeng, Tomoko Shirai, Yosuke Niwa, Shigeyuki Ishidoya, Fumikazu Taketani, Daisuke Sasano, Naohiro Kosugi, Sohiko Kameyama, Hisahiro Takashima, Hideki Nara, Shinji Morimoto

Polar Science　27　100571-100571　2021/03

DOI： 10.1016/j.polar.2020.100571 　

ISSN： 1873-9652

eISSN： 1876-4428
Spatio-temporal variations of the atmospheric greenhouse gases and their sources and sinks in the Arctic region Peer-reviewed

Shinji Morimoto, Daisuke Goto, Shohei Murayama, Ryo Fujita, Yasunori Tohjima, Shigeyuki Ishidoya, Toshinobu Machida, Yoichi Inai, Prabir K. Patra, Shamil Maksyutov, Akihiko Ito, Shuji Aoki

Polar Science　27　100553-100553　2021/03
Publisher: Elsevier {BV}
DOI： 10.1016/j.polar.2020.100553 　
Seasonal Variations of SF6, CO2, CH4, and N2O in the UT/LS Region due to Emissions, Transport, and Chemistry Peer-reviewed

Jagat S. H. Bisht, Toshinobu Machida, Naveen Chandra, Kazuhiro Tsuboi, Prabir K. Patra, Taku Umezawa, Yosuke Niwa, Yousuke Sawa, Shinji Morimoto, Takakiyo Nakazawa, Naoko Saitoh, Masayuki Takigawa

Journal of Geophysical Research: Atmospheres　126　(4)　2021/02/27
Publisher: American Geophysical Union (AGU)
DOI： 10.1029/2020jd033541 　

ISSN： 2169-897X

eISSN： 2169-8996
Fractionation of O2/N2 and Ar/N2 in the Antarctic ice sheet during bubble formation and bubble-clathrate hydrate transition from precise gas measurements of the Dome Fuji ice core

Oyabu Ikumi, Kawamura Kenji, Uchida Tsutomu, Fujita Shuji, Kitamura Kyotaro, Hirabayashi, Aoki Shuji, Morimoto Shinji, Nakazawa Takakiyo, Severinghaus Jeffrey P., Morgan Jacob

Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research　2021　30-30　2021
Publisher: The Japanese Society of Snow and Ice / Japan Society for Snow Engineering
DOI： 10.14851/jcsir.2021.0_30 　

ISSN： 1883-0870

eISSN： 1883-0889
Intercomparison of O2/N2 ratio scales among AIST, NIES, TU, and SIO based on a round-robin exercise using gravimetric standard mixtures Peer-reviewed

Aoki, N, S. Ishidoya, Y. Tohjima, S. Morimoto, R.F. Keeling, A. Cox, S. Takebayashi, S. Murayama

Atmos. Meas. Tech.　14　6181-6193　2021

DOI： 10.5194/amt-14-6181-2021 　
Emissions from the Oil and Gas Sectors, Coal Mining and Ruminant Farming Drive Methane Growth over the Past Three Decades Peer-reviewed

Naveen CHANDRA, Prabir K. PATRA, Jagat S. H. BISHT, Akihiko ITO, Taku UMEZAWA, Nobuko SAIGUSA, Shinji MORIMOTO, Shuji AOKI, Greet JANSSENS-MAENHOUT, Ryo FUJITA, Masayuki TAKIGAWA, Shingo WATANABE, Naoko SAITOH, Josep G. CANADELL

Journal of the Meteorological Society of Japan. Ser. II　99　(2)　309-337　2021
Publisher: Meteorological Society of Japan
DOI： 10.2151/jmsj.2021-015 　

ISSN： 0026-1165

eISSN： 2186-9057
Global and Regional CH4 Emissions for 1995–2013 Derived From Atmospheric CH4, δ13C‐CH4, and δD‐CH4 Observations and a Chemical Transport Model Peer-reviewed

Ryo Fujita, Shinji Morimoto, Shamil Maksyutov, Heon‐Sook Kim, Mikhail Arshinov, Gordon Brailsford, Shuji Aoki, Takakiyo Nakazawa

Journal of Geophysical Research: Atmospheres　125　(14)　2020/07/27
Publisher: American Geophysical Union (AGU)
DOI： 10.1029/2020jd032903 　

ISSN： 2169-897X

eISSN： 2169-8996
Seasonal characteristics of trace gases transports into the extratropical upper troposphere and lower stratosphere Peer-reviewed

Inai, Y, Fujita, R, Machida, T, Matsueda, H, Sawa, Y, Tsuboi, K, Katsumata, K, Morimoto, S, Aoki, S, Nakazawa, T

Atmos. Chem. Phys.　19　7073-7103　2019/05
Three-dimensional simulation of stratospheric gravitational separation using the NIES global atmospheric tracer transport model Peer-reviewed

Belikov, D, S. Sugawara, S. Ishidoya, F. Hasebe, S. Maksyutov, S. Aoki, S. Morimoto, T. Nakazawa

Atmos. Chem. Phys.　19　(8)　5349-5361　2019/04
Publisher: Copernicus GmbH
DOI： 10.5194/acp-19-5349-2019 　

eISSN： 1680-7324

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Abstract. A three-dimensional simulation of gravitational separation, defined as the process of atmospheric molecule separation under gravity according to their molar masses, is performed for the first time in the upper troposphere and lower stratosphere. We analyze distributions of two isotopes with a small difference in molecular mass (13C16O2 (Mi=45) and 12C16O2 (Mi=44)) simulated by the National Institute for Environmental Studies (NIES) chemical transport model (TM) with a parameterization of molecular diffusion. The NIES model employs global reanalysis and an isentropic vertical coordinate and uses optimized CO2 fluxes. The applicability of the NIES TM to the modeling of gravitational separation is demonstrated by a comparison with measurements recorded by high-precision cryogenic balloon-borne samplers in the lower stratosphere. We investigate the processes affecting the seasonality of gravitational separation and examine the age of air derived from the tracer distributions modeled by the NIES TM. We find a strong relationship between age of air and gravitational separation for the main climatic zones. The advantages and limitations of using age of air and gravitational separation as indicators of the variability in the stratosphere circulation are discussed.
Coordinated upper-troposphere-to-stratosphere balloon experiment in Biak Peer-reviewed

Hasebe, F, S. Aoki, S. Morimoto, Y. Inai, T. Nakazawa, S. Sugawara, C. Ikeda, H. Honda, H. Yamazaki, Halimurrahman, N. Komala, F. Putri, A. Budiyono, M. Soedjarwo, S. Ishidoya, S. Toyoda, T. Shibata, M. Hayashi, N. Eguchi, N. Nishi, M. Fujiwara, S. Ogino, M. Shiotani, T. Sugidachi

Bull. Amer. Meteor. Soc., 99, 6, 1213-1230, doi: 10.1175/BAMS-D-16-0289.1　99　(6)　1213-1230　2018/06
Publisher: American Meteorological Society
DOI： 10.1175/BAMS-D-16-0289.1 　

ISSN： 0003-0007

eISSN： 1520-0477

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<title>Abstract</title>The stratospheric response to climate forcing, such as an increase in greenhouse gases, is often unpredictable because of interactions between radiation, dynamics, and chemistry. Climate models are unsuccessful in simulating the realistic distribution of stratospheric water vapor. The long-term trend of the stratospheric age of air (AoA), a measure that characterizes the stratospheric turnover time, remains inconsistent between diagnoses in climate models and estimates from tracer observations. For these reasons, observations designed specifically to distinguish the effects of individual contributing processes are required. Here, we report on the Coordinated Upper-Troposphere-to-Stratosphere Balloon Experiment in Biak (CUBE/Biak), an observation campaign organized in Indonesia. Being inside the “tropical pipe” makes it possible to study the dehydration in the tropical tropopause layer and the gradual ascent in the stratosphere while minimizing the effects of multiple circulation pathways and wave mixing. Cryogenic sampling of minor constituents and major isotopes was conducted simultaneously with radiosonde observations of water vapor, ozone, aerosols, and cloud particles. The water vapor “tape recorder,” gravitational separation, and isotopocules are being studied in conjunction with tracers that are accumulated in the atmosphere as dynamical and chemical measures of elapsed time since stratospheric air entry. The observational estimates concerning the AoA and water vapor tape recorder are compared with those derived from trajectory calculations.
Interlaboratory comparison of δ13C and δd measurements of atmospheric CH4 for combined use of data sets from different laboratories Peer-reviewed

Taku Umezawa, Carl A.M. Brenninkmeijer, Thomas Röckmann, Carina Van Der Veen, Stanley C. Tyler, Ryo Fujita, Shinji Morimoto, Shuji Aoki, Todd Sowers, Jochen Schmitt, Michael Bock, Jonas Beck, Hubertus Fischer, Sylvia E. Michel, Bruce H. Vaughn, John B. Miller, James W.C. White, Gordon Brailsford, Hinrich Schaefer, Peter Sperlich, Willi A. Brand, Michael Rothe, Thomas Blunier, David Lowry, Rebecca E. Fisher, Euan G. Nisbet, Andrew L. Rice, Peter Bergamaschi, Cordelia Veidt, Ingeborg Levin

Atmospheric Measurement Techniques　11　(2)　1207-1231　2018/03/02
Publisher: Copernicus GmbH
DOI： 10.5194/amt-11-1207-2018 　

ISSN： 1867-8548 1867-1381
Age and gravitational separation of the stratospheric air over Indonesia Peer-reviewed

Satoshi Sugawara, Shigeyuki Ishidoya, Shuji Aoki, Shinji Morimoto, Takakiyo Nakazawa, Sakae Toyoda, Yoichi Inai, Fumio Hasebe, Chusaku Ikeda, Hideyuki Honda, Daisuke Goto, Fanny A. Putri

Atmospheric Chemistry and Physics　18　(3)　1819-1833　2018/02/07
Publisher: Copernicus GmbH
DOI： 10.5194/acp-18-1819-2018 　

ISSN： 1680-7324 1680-7316
Vertical distributions of N<inf>2</inf>O isotopocules in the equatorial stratosphere Peer-reviewed

Sakae Toyoda, Naohiro Yoshida, Shinji Morimoto, Shuji Aoki, Takakiyo Nakazawa, Satoshi Sugawara, Shigeyuki Ishidoya, Mitsuo Uematsu, Yoichi Inai, Fumio Hasebe, Chusaku Ikeda, Hideyuki Honda, Kentaro Ishijima

Atmospheric Chemistry and Physics　18　(2)　833-844　2018/01/23
Publisher: Copernicus {GmbH}
DOI： 10.5194/acp-18-833-2018 　

ISSN： 1680-7316

eISSN： 1680-7324
Vertical distributions of N<inf>2</inf>O isotopocules in the equatorial stratosphere Peer-reviewed

Sakae Toyoda, Naohiro Yoshida, Shinji Morimoto, Shuji Aoki, Takakiyo Nakazawa, Satoshi Sugawara, Shigeyuki Ishidoya, Mitsuo Uematsu, Yoichi Inai, Fumio Hasebe, Chusaku Ikeda, Hideyuki Honda, Kentaro Ishijima

Atmospheric Chemistry and Physics　18　(2)　833-844　2018/01/23

DOI： 10.5194/acp-18-833-2018 　

ISSN： 1680-7316

eISSN： 1680-7324
Coordinated upper-troposphere-to-stratosphere balloon experiment in Biak (CUBE/Biak) Peer-reviewed

Hasebe, F, S. Aoki, S. Morimoto, Y. Inai, T. Nakazawa, S. Sugawara, C. Ikeda, H. Honda, H. Yamazaki, Halimurrahman, N. Komala, F. Putri, A. Budiyono, M. Soedjarwo, S. Ishidoya, S. Toyoda, T. Shibata, M. Hayashi, N. Eguchi, N. Nishi, M. Fujiwara, S. Ogino, M. Shiotani, T. Sugidachi

Bulletin of the American Meteorological Society　2018

DOI： 10.1175/BAMS-D-16-0289.1 　

ISSN： 1520-0477

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This article introduces CUBE/Biak, a big-balloon air sampling campaign conducted in Indonesia, describing from the scientific scope in historical perspective through challenges in campaign coordination.
Observations of dynamics and chemistry in the tropical upper atmosphere to disentangle the process responsible for global circulation changes Peer-reviewed

Hasebe, F, S. Aoki, S. Morimoto, Y. Inai, T. Nakazawa, S. Sugawara, C. Ikeda, H. Honda, H. Yamazaki, H. Mukri, N. Komala, F. A. Putri, A. Budiyono, M. Soedjarwo, S. Ishidoya, S. Toyoda, T. Shibata, M. Hayashi, N. Eguchi, N. Nishi, M. Fujiwara, S.-Y. Ogino, M. Shiotani, T. Sugidachi

BAMS　2018/01

DOI： 10.1175/BAMS-D-16-0289.1 　
Vertical profiles and temporal variations of greenhouse gases in the stratosphere over Syowa Station, Antarctica Peer-reviewed

Goto, D, S. Morimoto, S. Aoki, S. Sugawara, S. Ishidoya, Y. Inai, S. Toyoda, H. Honda, G. Hashida, T. Yamanouchi, T. Nakazawa

SOLA　13　224-229　2017/11
Publisher: Meteorological Society of Japan
DOI： 10.2151/sola.2017-041 　

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Stratospheric air sampling using balloon-borne cryogenic air samplers was conducted over Syowa Station, Antarctica in four austral summers between 1998 and 2013. The CH₄ and N₂O mole fractions decreased with increasing altitude due to chemical reactions and photodissociation in the stratosphere, and a compact positive correlation between CH₄ and N₂O was found in their vertical profiles. The vertical profiles of CO₂ and SF₆ mole fractions showed high values in the lower stratosphere, decreasing gradually with altitude, and then becoming almost constant at altitudes above 18 km. Stratospheric CO₂ and SF₆ above 18km over Antarctica increased secularly at the respective average rates of 1.82 ± 0.31 ppm yr⁻¹ and 0.26 ± 0.01 ppt yr⁻¹ during the study period. The CO₂ and SF₆ mole fractions increased in the Antarctic stratosphere, but were delayed 4.5 ± 0.5 and 5.6 ± 0.2 years, respectively, compared to the tropical troposphere. The secular increase in stratospheric CH₄ was also detected by classifying the measured mole fractions in terms of the N₂O depletion in the stratosphere.
Long-term variations of the mole fraction and carbon isotope ratio of atmospheric methane observed at Ny-angstrom lesund, Svalbard from 1996 to 2013 Peer-reviewed

Shinji Morimoto, Ryo Fujita, Shuji Aoki, Daisuke Goto, Takakiyo Nakazawa

TELLUS SERIES B-CHEMICAL AND PHYSICAL METEOROLOGY　69　2017/10

DOI： 10.1080/16000889.2017.1380497 　

ISSN： 1600-0889
Terrestrial biospheric and oceanic CO2 uptakes estimated from long-term measurements of atmospheric CO2 mole fraction, C-13, and (O-2/N-2) at Ny-angstrom lesund, Svalbard Peer-reviewed

Daisuke Goto, Shinji Morimoto, Shigeyuki Ishidoya, Shuji Aoki, Takakiyo Nakazawa

JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES　122　(5)　1192-1202　2017/05

DOI： 10.1002/2017JG003845 　

ISSN： 2169-8953

eISSN： 2169-8961
インドネシア・ビアク島におけるクライオジェニックサンプラー回収気球実験 Peer-reviewed

池田忠作, 青木周司, 森本真司, 菅原敏, 本田秀之, 豊田栄, 石戸谷重之, 中澤高清, 長谷部文雄, 稲飯洋一, 林政彦, 柴田隆, 後藤大輔, Halimurrahman Mukri, Moedji Soedjarwo, Ninong Komala、Fanny A. Putri, Thohirin Chodijah、Agus Hidayat, Afif Budiyono, Thomas Djamaluddin, 飯嶋一征, 田村誠, 井筒直樹, 吉田哲也

宇宙航空研究開発機構研究開発報告　JAXA-RR-16-008　33-48　2017/03/01
InterComparison Experiments for Greenhouse Gases Observation (iceGGO) in 2012_2016 Peer-reviewed

Tsuboi, K, T. Nakazawa, H. Matsueda, T. Machida, S. Aoki, S. Morimoto, D. Goto, T. Shimosaka, K. Kato, N. Aoki, T. Watanabe, H. Mukai, Y. Tohjima, K. Katsumata, S. Murayama, S. Ishidoya, T. Fujitani, H. Koide, M. Takahashi, T. Kawasaki, A. Takizawa, Y. Sawa

Technical Reports of The Meteorological Research Institute　79　2017

DOI： 10.11483/mritechrepo.79 　
Seasonal and short-term variations in atmospheric potential oxygen at Ny-Alesund, Svalbard Peer-reviewed

Daisuke Goto, Shinji Morimoto, Shuji Aoki, Prabir K. Patra, Takakiyo Nakazawa

TELLUS SERIES B-CHEMICAL AND PHYSICAL METEOROLOGY　69　2017

DOI： 10.1080/16000889.2017.1311767 　

ISSN： 1600-0889
INTERCOMPARISON EXPERIMENTS OF STANDARD GASES FOR JMA/WCC ACTIVITY

T. Kawasaki, A. Takizawa, M. Takahashi, H. Koide, T. Nakazawa, S. Aoki, S. Morimoto, K. Kato, T. Shimosaka, N. Aoki, T. Watanabe, T. Machida, Y. Tohjima, H. Mukai, K. Katsumata, T. Fujitani, S. Murayama, S. Ishidoya, D. Goto, H. Matsueda, Y. Sawa, K. Tsuboi

GAW Report of 18th WMO/IAEA Meeting on Carbon Dioxide, Other Greenhouse Gases and Related Tracers Measurement Techniques (GGMT-2015)　No. 229　104-109　2016/09
Regional emission and loss budgets of atmospheric methane (2002–2012) Peer-reviewed

Patra, P. K, T. Saeki, E. J. Dlugokencky, K. Ishijima, T. Umezawa, A. Ito, S. Aoki, S. Morimoto, E. A. Kort, A. Crotwell, K. Ravi Kumar, T. Nakazawa

Journal of Meteorological Society of Japan　94　(1)　91-113　2016/03

DOI： 10.2151/jmsj.2016-006 　
Ship-based observations of atmospheric potential oxygen and regional air-sea O-2 flux in the northern North Pacific and the Arctic Ocean Peer-reviewed

Shigeyuki Ishidoya, Hiroshi Uchida, Daisuke Sasano, Naohiro Kosugi, Shoichi Taguchi, Masao Ishii, Shinji Morimoto, Yasunori Tohjima, Shigeto Nishino, Shohei Murayama, Shuji Aoki, Kentaro Ishijima, Ryo Fujita, Daisuke Goto, Takakiyo Nakazawa

TELLUS SERIES B-CHEMICAL AND PHYSICAL METEOROLOGY　68　(68)　2016

DOI： 10.3402/tellusb.v68.29972 　

ISSN： 1600-0889
Regional Methane Emission Estimation Based on Observed Atmospheric Concentrations (2002-2012) Peer-reviewed

Prabir K. Patra, Tazu Saeki, Edward J. Dlugokencky, Kentaro Ishijima, Taku Umezawa, Akihiko Ito, Shuji Aoki, Shinji Morimoto, Eric A. Kort, Andrew Crotwell

JOURNAL OF THE METEOROLOGICAL SOCIETY OF JAPAN　94　(1)　91-113　2016

DOI： 10.2151/jmsj.2016-006 　

ISSN： 0026-1165

eISSN： 2186-9057
Development of an atmospheric N2O isotopocule model and optimization procedure, and application to source estimation Peer-reviewed

K. Ishijima, M. Takigawa, K. Sudo, S. Toyoda, N. Yoshida, T. Röckmann, J. Kaiser, S. Aoki, S. Morimoto, S. Sugawara, T. Nakazawa

Atmospheric Chemistry and Physics Discussions　15　(14)　19947-20011　2015/07/22

DOI： 10.5194/acpd-15-19947-2015 　

ISSN： 1680-7367

eISSN： 1680-7375
Seasonal changes of CO2, CH4, N2O, and SF6 in the upper troposphere/lower stratosphere over the Eurasian continent observed by commercial airliner Peer-reviewed

Yousuke Sawa, Toshinobu Machida, Hidekazu Matsueda, Yosuke Niwa, Kazuhiro Tsuboi, Shohei Murayama, Shinji Morimoto, Shuji Aoki

GEOPHYSICAL RESEARCH LETTERS　42　(6)　2001-2008　2015/03

DOI： 10.1002/2014GL062734 　

ISSN： 0094-8276

eISSN： 1944-8007
Balloon Launch and Flight Operation from the Research Vessel Hakuho Maru for Stratospheric Air Sampling over the Eastern Pacific Equator Peer-reviewed

Hideyuki Fuke, Issei Iijima, Naoki Izutsu, Yukihiko Matsuzaka, Yoichi Kato, Yuya Kakehashi, Yasuhiro Shoji, Tetsuya Yoshida, Hideyuki Honda, Shuji Aoki, Yoichi Inai, Shinji Morimoto

JOURNAL OF ATMOSPHERIC AND OCEANIC TECHNOLOGY　31　(7)　1540-1548　2014/07

DOI： 10.1175/JTECH-D-13-00248.1 　

ISSN： 0739-0572

eISSN： 1520-0426
Variations of tropospheric methane over Japan during 1988-2010 Peer-reviewed

Taku Umezawa, Daisuke Goto, Shuji Aoki, Kentaro Ishijima, Prabir K. Patra, Satoshi Sugawara, Shinji Morimoto, Takakiyo Nakazawa

TELLUS SERIES B-CHEMICAL AND PHYSICAL METEOROLOGY　66　2014

DOI： 10.3402/tellusb.v66.23837 　

ISSN： 1600-0889
大気球観測により初めて捉えられた成層圏大気主成分の重力分離とその中層大気循環研究への応用 Peer-reviewed

S. Ishidoya, S. Sugawara, S. Morimoto, S. Aoki, T. Nakazawa, S. Toyoda, H. Honda, G. Hashida, S. Murayama, T. Yamanouchi

JAXA-RR　31　1540-1548　2014
Development of a High Precision Continuous Measurement System for the Atmospheric O-2/N-2 Ratio and Its Application at Aobayama, Sendai, Japan Peer-reviewed

Daisuke Goto, Shinji Morimoto, Shigeyuki Ishidoya, Akinori Ogi, Shuji Aoki, Takakiyo Nakazawa

JOURNAL OF THE METEOROLOGICAL SOCIETY OF JAPAN　91　(2)　179-192　2013/04

DOI： 10.2151/jmsj.2013-206 　

ISSN： 0026-1165

eISSN： 2186-9057
Gravitational separation in the stratosphere - A new indicator of atmospheric circulation Peer-reviewed

S. Ishidoya, S. Sugawara, S. Morimoto, S. Aoki, T. Nakazawa, H. Honda, S. Murayama

Atmospheric Chemistry and Physics　13　(17)　8787-8796　2013

DOI： 10.5194/acp-13-8787-2013 　

ISSN： 1680-7316 1680-7324
A high-precision continuous measurement system for the atmospheric O 2/N2 ratio at Ny-Ålesund, Svalbard and preliminary observational results Peer-reviewed

Goto, D, S. Morimoto, S. Aok, T. Nakazawa

Antarct. Rec.　57　(1)　17-27　2013
Publisher: National Institute of Polar Research
DOI： 10.15094/00009680 　

ISSN： 0085-7289

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With the aim of carrying out detailed monitoring of temporal variations in the atmospheric O_2/N_2 ratio at Ny-Alesund, Svalbard, we have developed a new highprecision continuous measurement system, with a precision of better than ±4.0 per meg, using a fuel-cell O_2 analyzer. Considering the remoteness of the observation site, special attention was paid to the measurement system, in that: (1) the system can be controlled remotely from Japan using the Internet; (2) all of the data output from the system can be monitored and collected in Japan via the Internet; (3) a specially designed water trap based on a Stirling cooler is employed to automate the removal of water vapor from the sample air; (4) the CO_2 concentration can also be measured; and (5) it is possible to operate the system for one year without having to manually replace the high-pressure cylinders of standard gas and reference air. Systematic observation of the atmospheric O_2/N_2 ratio using the newly developed measurement system began at the site on November 8, 2012. By analyzing the observational results obtained over the first month, the effectiveness of the measurement system was verified, and the causes of cha acteristic temporal variations in the observed atmospheric O_2/N_2 ratio were examined.
O-2:CO2 exchange ratios observed in a cool temperate deciduous forest ecosystem of central Japan Peer-reviewed

Shigeyuki Ishidoya, Shohei Murayama, Chikako Takamura, Hiroaki Kondo, Nobuko Saigusa, Daisuke Goto, Shinji Morimoto, Nobuyuki Aoki, Shuji Aoki, Takakiyo Nakazawa

TELLUS SERIES B-CHEMICAL AND PHYSICAL METEOROLOGY　65　2013

DOI： 10.3402/tellusb.v65i0.21120 　

ISSN： 0280-6509

eISSN： 1600-0889
Oceanic and terrestrial biospheric CO2 uptake estimated from atmospheric potential oxygen observed at Ny-Alesund, Svalbard, and Syowa, Antarctica Peer-reviewed

Shigeyuki Ishidoya, Shinji Morimoto, Shuji Aoki, Shoichi Taguchi, Daisuke Goto, Shohei Murayama, Takakiyo Nakazawa

TELLUS SERIES B-CHEMICAL AND PHYSICAL METEOROLOGY　64　18924　2012

DOI： 10.3402/tellusb.v64i0.18924 　

ISSN： 0280-6509
Carbon and hydrogen stable isotopic ratios of methane emitted from wetlands and wildfires in Alaska: Aircraft observations and bonfire experiments Peer-reviewed

Taku Umezawa, Shuji Aoki, Yongwon Kim, Shinji Morimoto, Takakiyo Nakazawa

JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES　116　D15305　2011/08

DOI： 10.1029/2010JD015545 　

ISSN： 2169-897X

eISSN： 2169-8996
Carbon and hydrogen stable isotopic ratios of methane emitted from wetlands and wildfires in Alaska: Aircraft observations and bonfire experiments Peer-reviewed

Taku Umezawa, Shuji Aoki, Yongwon Kim, Shinji Morimoto, Takakiyo Nakazawa

Journal of Geophysical Research Atmospheres　116　(15)　2011
Publisher: Blackwell Publishing Ltd
DOI： 10.1029/2010JD015545 　

ISSN： 0148-0227
Gravitational separation of major atmospheric components observed in the stratosphere over Syowa Station, Antarctica, Kiruna, Sweden and Sanriku, Japan. Peer-reviewed

Shigeyuki Ishidoya, Satoshi Sugawara, Shinji Morimoto, Shuji Aoki, Takakiyo Nakazawa, Hideyuki Honda, Takashi Yamanouchi

南極資料　54　(0)　426-437　2010/12/28

DOI： 10.15094/00009565 　

ISSN： 0085-7289

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To investigate the gravitational separation of atmospheric components in the stratosphere, air samples collected using an aircraft during the Arctic Airborne Measurement Program 2002 (AAMP02) were analyzed for the O_2 N_2 ratios (δ(O_2 N_2)), δ^<15>N of N_2, δ^<18>O of O_2 and Ar N_2 ratio (δ(Ar N_2)). The relationship between observed stratospheric δ^<15>N of N_2, δ^<18>O of O_2 and δ(Ar N_2) over the Svalbard Islands and Barrow showed mass-dependent fractionation of atmospheric components in the stratosphere, which suggested that gravitational separation could be observable in the lowermost stratosphere inside the polar vortex. By examining the rates of change in δ(O_2 Nv) and δ^<13>C of CO_2 relative to the CO_2 concentration, such observed correlations were bound to be mainly attributable to upward propagation of their seasonal cycles produced in the troposphere and height-dependent air age as well as gravitational separation in the stratosphere. Air samples collected over Syowa Station, Antarctica, Kiruna, Sweden and Sanriku, Japan using balloon-borne cryogenic air samplers were analyzed for δ^<15>N of Nv and δ^<18>O of O_2. Strength of the gravitational separation was a function of latitude, showing the largest separation inside the polar vortex over Kiruna. It is suggested that information on increase of gravitational separation with height is useful in understanding the vertical transport of air masses in the stratosphere. By comparing the gravitational separations, mean age of air and N_2O concentration at two height intervals with N_2O concentrations > 125 ppb and < 45 ppb, the effect of descending air was found to be more significant over Kiruna than over Syowa Station and Sanriku. The variation in the gravitational separation with height is found to be weaker in the region with N_2O concentrations between 45 and 125 ppb than in other regions, which might suggest that vertical mixing of air occurred in this region.
Temporal variations of atmospheric greenhouse gases and their related gases at Syowa Station, Antarctica and Ny-Alesund, Svalbard.

Shinji Morimoto, Shigeyuki Ishidoya, Kentarou Ishijima, Hisashi Yashiro, Taku Umezawa, Gen Hashida, Satoshi Sugawara, Shuji Aoki, Takakiyo Nakazawa, Takashi Yamanouchi

Antarctic record　54　(0)　374-409　2010/12/28
Publisher: 国立極地研究所
DOI： 10.15094/00009563 　

ISSN： 0085-7289

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To elucidate temporal variations of greenhouse gases and their related gases in the Arctic and Antarctic regions and to investigate their sources and sinks, systematic measurements of atmospheric CO_2, CH_4CO, N_2O, O_2 and tropospheric O_3 concentrations have been carried out at Syowa Station, Antarctica and Ny-Alesund, Svalbard. The CO_2 concentrations at both polar sites have increased at a rate of about 1.9 ppmv yr^<-1>, reflecting fossil fuel combustion and land use change. The CH_4 concentrations also showed clear seasonal cycles superimposed on complex secular trends. The increase rate of the CH_4 concentration varied with time. CH_4 increases were observed until 1999, the concentrations remained steady from 2000 to 2006 and then rapid increases were observed in 2007. Stable isotope data of CH_4 revealed causes of the seasonal cycles and the secular variations of the CH_4 concentrations. The O_2 concentrations (δ(O_2 N_2)) at both polar sites showed prominent seasonal cycles and secular decreasing trends. From analyses of the Atmospheric Potential Oxygen (APO) and CO_2 concentrations, the CO_2 uptake rates by the terrestrial biosphere and the ocean were estimated to be 1.1 and 2.7 GtC yr^<-1>, respectively. By comparing the N_2O concentrations observed at Ny-Alesund and numerical model results, it was suggested that the observed seasonal N_2O cycle could be enlarged by intrusion of a stratospheric air mass with low N_2O concentration into the troposphere in summer. With an analysis using a three dimensional chemical-transport model and the CO concentration at Syowa Station, sporadic increases of CO concentration observed in February-March, 2003 and February, 2007 were ascribed to CO release by large-scale forest fires in Australia. Surface ozone depletion events were observed more than 40 times at Syowa Station from 1988 to 2007.
Stratopheric greenhouse gas observation using a balloon-borne cryogenic sampler at Syowa Station, Antarctica Peer-reviewed

Sugawara Satoshi, Toyoda Sakae, Ishidoya Shigeyuki, Morimoto Shinji, Hashida Gen, Aoki Shuji, Nakazawa Takakiyo, Yamanouchi Takashi, Honda Hideyuki

Antarctic record　54　(0)　410-425　2010/12
Publisher: National Institute of Polar Research
ISSN： 0085-7289

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Balloon-borne cryogenic samplers were launched from Japanese Antarctic Station, Syowa, on December 26, 2003 and January 5, 2004. Stratospheric air samples were successfully collected at 11 different altitudes from 10 to 30 km. After air samples were transported to Japan, they were analyzed for various greenhouse gases and their isotopes. The CO_2 concentration, thus obtained, shows no significant vertical gradient above 20 km. Secular increase of CO_2 concentration was clearly observable in the mid-stratosphere over Syowa station. From the average CO_2 concentrations in 1998 and 2004, the concentration difference was calculated to be 9.7 ppm, which is almost same the tropospheric trend. The average mean age was estimated to be 5.0±0.2 years above 20 km. This value was almost the same as that estimated from the CO_2 concentration data in 1998, 4.9±0.2 years. This result implies that there is no secular change of the mean age in the Antarctic stratosphere during this period. Vertical distributions of N_2O isotopomer ratios showed different characteristics among December, January, and previous observations in January 1998, showing that the short-term and long-term effects of transport processes.
Secular trends and seasonal variations of partial pressure of carbon dioxide in the surface sea water in the Australian secutor of the Southern Ocean Peer-reviewed

Hashida G, Nakaoka S, Ono H, Nakazawa T, Yoshikawa H, Aoki S, Morimoto S, Yamanouchi T, Odate T, Fukuchi M

Antarctic Record　54　438-448　2010/12
Publisher: National Institute of Polar Research
ISSN： 0085-7289

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In order to elucidate the secular trends of oceanic CO_2 uptake in the Indian sector of the Southern Ocean, pCO_2, the partial pressure of CO_2 in the ocean surface layer, has been measured since 1987 on board the icebreaker Shirase. Meridional distributions of pCO_2 along 110゜E in early December clearly show steep changes at such fronts as the subtropical front, subantarctic front, and polar front. Although pCO_2 of each zone shows interannual variation, secular trend is detectable. For example, the estimated rate of increase of pCO_2 in the permanent open ocean zone between the polar front (around 53゜S) and the northern edge of winter ice cover (63゜S) is about 1.3 μatm y, which is slightly lower than the rate of increase of the atmospheric CO_2 concentration. From the results obtained by multi-ship observations with 4 research vessels in the Southern Ocean in summer, we found that the values of pCO_2 off the coast of the Antarctic Continent (66゜S) varied temporally by 100 μatm for 5 months. We also found that nDIC decreased with time from December 2001 to March 2002 in the upper layer from 100 to 200 m due to biological activity during summer.
Seasonal variations of atmospheric CO2, delta C-13, and delta O-18 at a cool temperate deciduous forest in Japan: Influence of Asian monsoon Peer-reviewed

S. Murayama, C. Takamura, S. Yamamoto, N. Saigusa, S. Morimoto, H. Kondo, T. Nakazawa, S. Aoki, T. Usami, M. Kondo

JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES　115　D17304　2010/09

DOI： 10.1029/2009JD013626 　

ISSN： 2169-897X

eISSN： 2169-8996
Air-lake exchange of methane during the open water season in Syowa Oasis, East Antarctica Peer-reviewed

Masafumi Sasaki, Noboru Endoh, Satoshi Imura, Sakae Kudoh, Takashi Yamanouchi, Shinji Morimoto, Gen Hashida

JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES　115　2010/08

DOI： 10.1029/2010JD013822 　

ISSN： 2169-897X
Seasonal variations of atmospheric CO<inf>2</inf>, δ13C, and δ18O at a cool temperate deciduous forest in Japan: Influence of Asian monsoon Peer-reviewed

S. Murayama, C. Takamura, S. Yamamoto, N. Saigusa, S. Morimoto, H. Kondo, T. Nakazawa, S. Aoki, T. Usami, M. Kondo

Journal of Geophysical Research Atmospheres　115　(17)　2010
Publisher: Blackwell Publishing Ltd
DOI： 10.1029/2009JD013626 　

ISSN： 0148-0227
Air-lake exchange of methane during the open water season in Syowa Oasis, East Antarctica Peer-reviewed

Masafumi Sasaki, Noboru Endoh, Satoshi Imura, Sakae Kudoh, Takashi Yamanouchi, Shinji Morimoto, Gen Hashida

Journal of Geophysical Research Atmospheres　115　(16)　2010
Publisher: Blackwell Publishing Ltd
DOI： 10.1029/2010JD013822 　

ISSN： 0148-0227
Gravitational separation of major atmospheric components observed in the stratosphere over Syowa Station, Antarctica, Kiruna, Sweden and Sanriku, Japan Peer-reviewed

Ishidoya Shigeyuki, Sugawara Satoshi, Morimoto Shinji, Aoki Shuji, Nakazawa Takakiyo, Honda Hideyuki, Yamanouchi Takashi

Antarctic Record　54　(Sp. Iss. SI)　426-437　2010
Stratopheric greenhouse gas observation using a balloon-borne cryogenic sampler at Syowa Station, Antarctica Peer-reviewed

Sugawara Satoshi, Toyoda Sakae, Ishidoya Shigeyuki, Morimoto Shinji, Hashida Gen, Aoki Shuji, Nakazawa Takakiyo, Yamanouchi Takashi, Honda Hideyuki

Antarctic Record　54　(Sp. Iss. SI)　410-425　2010
A New Compact Cryogenic Air Sampler and Its Application in Stratospheric Greenhouse Gas Observation at Syowa Station, Antarctica Peer-reviewed

Shinji Morimoto, Takashi Yamanouchi, Hideyuki Honda, Shuji Aoki, Takakiyo Nakazawa, Satoshi Sugawara, Shigeyuki Ishidoya, Issei Iijima, Tetsuya Yoshida

JOURNAL OF ATMOSPHERIC AND OCEANIC TECHNOLOGY　26　(10)　2182-2191　2009/10

DOI： 10.1175/2009JTECHA1283.1 　

ISSN： 0739-0572

eISSN： 1520-0426
Variation of the oxygen isotopic ratio of atmospheric CO2 in a cool temperate deciduous forest in central Japan

C. Takamura, S. Murayama, T. Nakazawa, S. Aoki, N. Saigusa, S. Morimoto

Proceedings of the 8th International Carbon Dioxide Conference　CD　2009/09
Long-term variation of oceanic carbon dioxide and possible acidification in the Indian sector of the Southern Ocean

G. Hashida, T. Nakazawa, S. Aoki, S. Nakaoka, T. Yamanouchi, H. Yoshikawa-Inoue, S. Morimoto

Proceedings of the 8th International Carbon Dioxide Conference　CD　2009/09
Long-term variation of carbon isotopic ratio of the stratospheric CO2

S. Sugawara, S. Aoki, T. Nakazawa, K. Genma, S. Ishidoya, S. Morimoto

Proceedings of the 8th International Carbon Dioxide Conference　CD　2009/09
Continuous measurements of the atmospheric O2/N2 ratio at suburban and coastal sites in the northeastern part of the main island of Japan

D. Goto, S. Morimoto, S. Ishidoya, S. Aoki, T. Nakazawa

Proceedings of the 8th International Carbon Dioxide Conference　CD　2009/09
Continuous measurement of the atmospheric O2/N2 ratio at Syowa Station, Antarctica

S. Morimoto, D. Goto, S. Ishidoya, T. Nakazawa, S. Aoki

Proceedings of the 8th International Carbon Dioxide Conference　CD　2009/09
Methane efflux from bubbles suspended in ice-covered lakes in Syowa Oasis, East Antarctica Peer-reviewed

Masafumi Sasaki, Satoshi Imura, Sakae Kudoh, Takashi Yamanouchi, Shinji Morimoto, Gen Hashida

JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES　114　2009/09

DOI： 10.1029/2009JD011849 　

ISSN： 2169-897X
A High-precision Measurement System for Carbon and Hydrogen Isotopic Ratios of Atmospheric Methane and Its Application to Air Samples Collected in the Western Pacific Region Peer-reviewed

Taku Umezawa, Shuji Aoki, Takakiyo Nakazawa, Shinji Morimoto

JOURNAL OF THE METEOROLOGICAL SOCIETY OF JAPAN　87　(3)　365-379　2009/06

DOI： 10.2151/jmsj.87.365 　

ISSN： 0026-1165

eISSN： 2186-9057
Development of a compact cryogenic sampler for stratospheric air sampling using J-T mini cooler Peer-reviewed

MORIMOTO Shinji, YAMANOUCHI Takashi, HONDA Hideyuki, AOKI Shuji, NAKAZAWA Takakiyo, SUGAWARA Satoshi, ISHIDOYA Shigeyuki, IIJIMA Issei, YOSHIDA Tetsuya

JAXA research and development report　8　(001)　63-74　2009/02
Publisher: Japan Aerospace Exploration Agency
ISSN： 1349-1113

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A compact cryogenic whole air sampler was developed using Joule-Thomson (J-T) mini cooler. The J-Tcooler could produce cooling through the J-T expansion of high-pressure neon gas. The compact sampler used the cooling, thus produced, to collect stratospheric air samples cryogenically. Our laboratory experiments showed the compact sampler could collect air samples of 2.8 and 7.2 L_<STP> at the sample pressures of 25 and 200 hPa, respectively,in 4 minutes, when the neon gas was supplied from a 2-L cylinder of 19.0 MPa in pressure. Concentrations of CO_2 and CH_4 and carbon isotope ratio of CH_4 of the collected samples were confi rmed to be unchanged. A balloon-borne stratospheric air sampling experiment with the compact sampler was conducted at Sanriku Balloon Center on June 4, 2007, resulting that the sampler worked as expected in the stratosphere.
Methane efflux from bubbles suspended in ice-covered lakes in Syowa Oasis, East Antarctica Peer-reviewed

Masafumi Sasaki, Satoshi Imura, Sakae Kudoh, Takashi Yamanouchi, Shinji Morimoto, Gen Hashida

Journal of Geophysical Research Atmospheres　114　(18)　2009
Publisher: Blackwell Publishing Ltd
DOI： 10.1029/2009JD011849 　

ISSN： 0148-0227
Development of a high precision measurement system of the atmospheric O2/N2 ratio using a fuel cell oxygen analyzer

Shinji Morimoto, Shigeyuki Ishidoya, Daisuke Goto, Akinori Ogi, Shuji Aoki, Takakiyo Nakazawa

Report of the 14th WMO meeting of experts on carbon dioxide, Other Greenhouse Gases and related tracer measurement techniques　WMO-TD No. 186　67-70　2009
Growth rate, seasonal, synoptic and diurnal variations in lower atmospheric methane Peer-reviewed

P. K. Patra, M. Takigawa, K. Ishijima, B.-C. Choi, D. Cunnold, E. J. Dlugokencky, T.-Y. Goo, J.-S. Kim, P. Krummel, R. Langenfelds, F. Meinhardt, S. Morimoto, H. Mukai, R. G. Prinn, P. Steele, Y. Tohjima, K. Tsuboi, K. Uhse, R. Weiss, D. Worthy, T. Nakazawa

J. Meteorolo. Soc. Japan　87　615-633　2009
High precision continuous measurement system of the atmospheric O2/N2 ratio using a fuel cell oxygen analyzer Invited

S. Morimoto, S. Ishidoya, D. Goto, A. Ogi, S. Aoki, T. Nakazawa

Report of the 14th WMO meeting of experts on carbon dioxide concentration and related tracer measurement techniques　WMO-TD 186　85-88　2009
High precision measurements of carbon isotopic ratio of atmospheric methane using a continuous flow mass spectrometer Peer-reviewed

Morimoto, S, S. Aoki, T. Nakazawa

Antarct. Rec.　53　(1)　1-8　2009

ISSN： 0085-7289
Temporal and spatial variations of the atmospheric CO2 concentration in China Peer-reviewed

Dongqi Zhang, Jie Tang, Guangyu Shi, Takakiyo Nakazawa, Shuji Aoki, Satoshi Sugawara, Min Wen, Shinji Morimoto, Prabir K. Patra, Tadahiro Hayasaka, Tazu Saeki

GEOPHYSICAL RESEARCH LETTERS　35　(3)　L03801　2008/02

DOI： 10.1029/2007GL032531 　

ISSN： 0094-8276
Gravitational separation suggested by O(2)/N(2), delta(15)N of N(2), delta(18)O of O(2), Ar/N(2) observed in the lowermost part of the stratosphere at northern middle and high latitudes in the early spring of 2002 Peer-reviewed

Shigeyuki Ishidoya, Shinji Morimoto, Satoshi Sugawara, Tomonori Watai, Toshinobu Machida, Shuji Aoki, Takakiyo Nakazawa, Takashi Yamanouchi

GEOPHYSICAL RESEARCH LETTERS　35　(3)　L03812　2008/02

DOI： 10.1029/2007GL031526 　

ISSN： 0094-8276
Gravitational separation of major atmospheric components of nitrogen and oxygen in the stratosphere Peer-reviewed

Shigeyuki Ishidoya, Satoshi Sugawara, Shinji Morimoto, Shuji Aoki, Takakiyo Nakazawa

GEOPHYSICAL RESEARCH LETTERS　35　(3)　L03811　2008/02

DOI： 10.1029/2007GL030456 　

ISSN： 0094-8276
Temporal variations of the atmospheric nitrous oxide concentration and its δ15N and δ18O for the latter half of the 20th century reconstructed from firn air analyses

Kentaro Ishijima, Satoshi Sugawara, Kenji Kawamura, Gen Hashida, Shinji Morimoto, Shohei Murayama, Shuji Aoki, Takakiyo Nakazawa

Journal of Geophysical Research Atmospheres　112　(3)　2007/02/16
Publisher: Blackwell Publishing Ltd
DOI： 10.1029/2006JD007208 　

ISSN： 0148-0227
Temporal variations of the atmospheric nitrous oxide concentration and its delta N-15 and delta O-18 for the latter half of the 20th century reconstructed from firn air analyses Peer-reviewed

Kentaro Ishijima, Satoshi Sugawara, Kenji Kawamura, Gen Hashida, Shinji Morimoto, Shohei Murayama, Shuji Aoki, Takakiyo Nakazawa

JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES　112　(D3)　D03305　2007/02

DOI： 10.1029/2006JD007208 　

ISSN： 2169-897X

eISSN： 2169-8996
Concentration variation of the atmospheric CO2 observed at Syowa Station, Antarctica from 1984 to 2000. Peer-reviewed

Morimoto, S, T. Nakazawa, S. Aoki, G. Hashida, T. Yamanouchi

Tellus　55B, 170-177　2007

DOI： 10.1034/j.1600-0889.2003.01471.x 　
Temporal variations of the atmospheric nitrous oxide concentration and its isotopic ratios reconstructed from firn air analysis Peer-reviewed

K. Ishijima, S. Sugawara, K. Kawamura, G. Hashida, S. Morimoto, S. Murayama, S. Aoki, T. Nakazawa

J. Geopys. Res.　112　D03305, doi:10.1029/2006JD0072　2007

DOI： 10.1029/2006JD007208 　
Vertical profiles of the O2/N2 ratio in the stratosphere over Japan and Antarctica Peer-reviewed

Shigeyuki Ishidoya, Satoshi Sugawara, Gen Hashida, Shinji Morimoto, Shuji Aoki, Takakiyo Nakazawa, Takashi Yamanouchi

GEOPHYSICAL RESEARCH LETTERS　33　(13)　L13701　2006/07

DOI： 10.1029/2006GL025886 　

ISSN： 0094-8276

eISSN： 1944-8007
Temporal and spatial variations of oceanic pCO(2) and air-sea CO2 flux in the Greenland Sea and the Barents Sea Peer-reviewed

S Nakaoka, S Aiki, T Nakazawa, G Hashida, S Morimoto, T Yamanouchi, H Yoshikawa-Inoue

TELLUS SERIES B-CHEMICAL AND PHYSICAL METEOROLOGY　58　(2)　148-161　2006/04

DOI： 10.1111/j.1600-0889.2006.00178.x 　

ISSN： 0280-6509
Atmospheric observation room for clean air at Syowa Station, East Antarctica Peer-reviewed

Osada, Kazuo, Hayashi, Masahiko, Shiobara, Masataka, Hara, Keiichiro, Wada, Makoto, Hashida, Gen, Morimoto, Shinji, Yabuki, Masanori, Yamanouchi, Takashi

Antarctic Record　50　(1)　2006
Temporal variations of the carbon isotopic ratio of atmospheric methane observed at Ny Alesund, Svalbard from 1996 to 2004 Peer-reviewed

S Morimoto, S Aoki, T Nakazawa, T Yamanouchi

GEOPHYSICAL RESEARCH LETTERS　33　(1)　L01807　2006/01

DOI： 10.1029/2005GL024648 　

ISSN： 0094-8276

eISSN： 1944-8007
Observations of atmospheric CO2 concentration and its carbon isotopic ratio in China.

Sugawara, S, S. Aoki, T. Nakazawa, J. Tang, D. Zhang, G.-Y. Shi, Y. Liu, S. Morimoto, S. Ishidoya, T. Saeki, T. Hayasaka, M. Ishizawa

Proceeding of 7th International Carbon Dioxide Conference, September 25-30, 2005, Broomfield, USA　provided by CD　2005/09
Stratospheric Air Sampling Using a Balloon-borne Cryogenic Sampler Over Syowa Station, Antarctica by the 45th Japanese Antarctic Research Expedition Team

SUGAWARA Satoshi, HASHIDA Gen, ISHIDOYA Shigeyuki, NAMIKI Michiyoshi, IIJIMA Issei, MORIMOTO Shinji, AOKI Shuji, HONDA Hideyuki, IZUTSU Naoki, NAKAZAWA Takakiyo, YAMANOUCHI Takashi

JAXA research and development report　4　77-87　2005/02
Publisher: Japan Aerospace Exploration Agency
ISSN： 1349-1113

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Balloon-borne cryogenic samplers were launched from Japanese Antarctic Station,Syowa, on December 26, 2003 and January 5, 2004 by the 45th Japanese Antarctic Research Expedition team. Stratospheric air samples were successfully collected at 11 different altitudes from 10 to 30 km. After air sampling, the cryogenic samplers descended using a parachute and landed safely on sea ice near the station, and then they were recovered by using a helicopter. By measuring the pressures of air samples collected, it was found that their amounts were 9-18 L_<STP>, which are enough to analyze many atmospheric components. It is expected that long-term variations of the atmospheric components in the Antarctic stratosphere are elucidated by comparing the present analysis results with those of a similar measurement made in 1998.
連続観測システムの遠隔監視用小型データ収録装置の開発 Peer-reviewed

森本真司, 田中洋一

Antarctic Record　49　(2)　182-191　2005
Publisher: National Institute of Polar Research
DOI： 10.15094/00009324 　

ISSN： 0085-7289

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A data acquisition system based on an embedded CPU board and Linux/OS has been developed for monitoring continuous measurement systems installed at remote observation sites through a network. This system has several types of Input/Output devices, such as AD converter, parallel and serial IOs. Ethernet ports are also provided so that most network software can be used on the system. It was confirmed that all devices responded within 1 ms after being triggered by user software and the system had been stable for a long time under normal load. This performance is adequate for the purpose of monitoring a measurement system's status.
Temporal and latitudinal distributions of stratospheric N<inf>2</inf>O isotopomers Peer-reviewed

Sakae Toyoda, Naohiro Yoshida, Taichiro Urabe, Yusuke Nakayama, Takeshi Suzuki, Kazuhide Tsuji, Kazuhiko Shibuya, Shuji Aoki, Takakiyo Nakazawa, Shigeyuki Ishidoya, Kentaro Ishijima, Satoshi Sugawara, Toshinobu Machida, Gen Hashida, Shinji Morimoto, Hideyuki Honda

Journal of Geophysical Research D: Atmospheres　109　(8)　2004/04

DOI： 10.1029/2003JD004316 　

ISSN： 0148-0227
Temporal and latitudinal distributions of stratospheric N2O isotopomers Peer-reviewed

S Toyoda, N Yoshida, T Urabe, Y Nakayama, T Suzuki, K Tsuji, K Shibuya, S Aoki, T Nakazawa, S Ishidoya, K Ishijima, S Sugawara, T Machida, G Hashida, S Morimoto, H Honda

JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES　109　(D8)　D08308　2004/04

DOI： 10.1029/2003JD004316 　

ISSN： 2169-897X
Carbonyl sulfide concentration in the arctic lowermost stratosphere and stratosphere-troposphere transport Peer-reviewed

Y Inomata, Y Iwasaka, S Morimoto, M Shiobara, T Machida, S Sugawara

JOURNAL OF THE METEOROLOGICAL SOCIETY OF JAPAN　81　(6)　1471-1484　2003/12

ISSN： 0026-1165

eISSN： 2186-9057
Concentration variations of atmospheric CO2 observed at Syowa Station, Antarctica from 1984 to 2000 Peer-reviewed

S Morimoto, T Nakazawa, S Aoki, G Hashida, T Yamanouchi

TELLUS SERIES B-CHEMICAL AND PHYSICAL METEOROLOGY　55　(2)　170-177　2003/04

DOI： 10.1034/j.1600-0889.2003.01471.x 　

ISSN： 0280-6509
Carbon dioxide variations in the stratosphere over Japan, Scandinavia and Antarctica Peer-reviewed

S Aoki, T Nakazawa, T Machida, S Sugawara, S Morimoto, G Hashida, T Yamanouchi, K Kawamura, H Honda

TELLUS SERIES B-CHEMICAL AND PHYSICAL METEOROLOGY　55　(2)　178-186　2003/04

DOI： 10.1034/j.1600-0889.2003.00059.x 　

ISSN： 0280-6509
Preliminary report of "Arctic Airborne Measurement Program 2002" (AAMP02) Peer-reviewed

Yamanouchi Takashi, Wada Makoto, Shiobara Masataka, Morimoto Shinji, Asuma Yoshio, Yamagata Sadamu, Yamazaki Takashi, Ishidoya Shigeyuki, Kawahara Taku, Yabuki Masanori, Inomata Yayoi, Herber Andreas, Graeser Jurgen, Hara Keiichiro, Hirasawa Naohiko, Aoki Shuji, Sugawara Satoshi, Machida Toshinobu, Watai Tomonori, Treffeisen Renate

Polar meteorology and glaciology　17　17, 103-115-115　2003
Publisher: National Institute of Polar Research
ISSN： 1344-3437

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The Arctic Airborne Measurement Program 2002(AAMP 02) campaign was carried out in March 2002 as one of the sub programs of the project Variations of atmospheric constituents and their climate impact in the Arctic". The main goal of the project was to investigate the transport, transformation and radiative effect of trace gases and aerosols, and their role in the global climate. An instrumented jet plane, Gulfstream II(G-II), was flown from Nagoya, Japan via Barrow, Alaska to Longyearbyen(78°N , 15°E ), Svalbard, crossing the Arctic Ocean in the lower stratospher. Three local flights were made over the Greenland Sea around Svalbard and two profile flights near Barrow. The plane was equipped with CO_2 and ozone analyzers, gas and aerosol sampling systems, aerosol particle counter, nephelometer, absorption photometer, PMS particle probes, sunphotometer, dew point hygrometer and dropsonde system. During the campaign, intensitive surface operations were also conducted at Ny-Ålesund(79°N , 12°E ), Svalbard. Vertical profiles of several trace gases gave information about transport, a new observation by sunphotometer derived an aerosol optical depth in the stratosphere, and another new observation by dropsonde gave information on the polar vortex.
極域におけるモニタリングと氷床変動

渡邉興亜, 本山秀明, 牛尾収輝, 森本真司

「生物の科学遺伝」　別冊17号,58-68.　2003
Carbonyl sulfide concentration in the Arctic lowermost stratosphere and stratosphere-troposphere transport Peer-reviewed

Y. Inomata, Y. Iwasaka, S. Morimoto, M. Shiobara, T. Machida, S. Sugawara

Journal of the Meteorological Society of Japan　81　(6)　1471-1484　2003
Publisher: Meteorological Society of Japan
DOI： 10.2151/jmsj.81.1471 　

ISSN： 0026-1165
Ozone monitoring in the polar troposphere using a new diffusive sampler Peer-reviewed

F De Santis, C Vazzana, S Menichelli, Allegrini, I, S Morimoto

PHYSICS AND CHEMISTRY OF THE EARTH　28　(28-32)　1213-1216　2003

DOI： 10.1016/j.pce.2003.08.052 　

ISSN： 1474-7065
In-situ measurement of the ozone concentration in the Arctic Airborne Measurement Program 2002 (AAMP02) Peer-reviewed

Morimoto, S, T. Watai, T. Machida, M. Wada, T. Yamanouchi

Polar Meteorol. Glaciol.　17　81-93　2003
クロム還元法による水素同位体比の測定法と極域雪氷試料への適用 Peer-reviewed

本山秀明, 森本真司, 渡辺興亜

Antarctic Record　47　(2)　101-110　2003

DOI： 10.15094/00009260 　

ISSN： 0085-7289
Variations of stratospheric trace gases measured using a balloon-borne cryogenic sampler Peer-reviewed

T Nakazawa, S Aoki, K Kawamura, T Saeki, S Sugawara, H Honda, G Hashida, S Morimoto, N Yoshida, S Toyoda, Y Makide, T Shirai

SCIENTIFIC BALLOONING IN THE NEXT CENTURY: GOALS AND CHALLENGES　30　(5)　1349-1357　2002

DOI： 10.1016/S0273-1177(02)00551-3 　

ISSN： 0273-1177
In-situ measurements of the atmospheric CO concentration at Syowa Station, Antarctica. Peer-reviewed

Morimoto, S, M. Wada, S. Sugawara, S. Aoki, T. Nakazawa, T. Yamanouchi

Polar Meteorol. Glaciol.　16　95-105　2002
Publisher: National Institute of Polar Research
ISSN： 1344-3437

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A high-precision measurement system for the atmospheric CO concentration was developed. With some modifications to a gas chromatograph CO analyzer, instrumental reproducibility of 0.5 ppbv was achieved. This could be sufficient for detection of short-term, seasonal and long-term variations of the atmospheric CO concentration in the Antarctic region. A standard gas system to maintain a consistent calibration scale for the CO measurements was also prepared. The measurement system was installed at Syowa Station in March 2000 and has been maintained up to the present. The first-year's observation showed a clear seasonal cycle of CO concentration.
Temporal variations of the CO2 concentrations and isotope ratios observed at Syowa Station, Antarctica, since 1984

S. Morimoto

Proceedings of the 6th International Carbon Dioxide Conference　201-204　2001/10
Stratospheric whole air sampling at Antarctica using a compact grab sampler Peer-reviewed

H Honda, G Hashida, S Morimoto, N Yajima, T Nakazawa

15TH ESA SYMPOSIUM ON EUROPEAN ROCKET AND BALLOON PROGRAMMES AND RELATED RESEARCH, PROCEEDINGS　471　613-618　2001

ISSN： 0379-6566
Temporal variations of atmospheric CO2 concentration and carbon isotope ratio in Ny Ålesund, Svalbard. Peer-reviewed

Morimoto, S, S. Aoki, T. Yamanouchi

Mem. Natl. Polar Res., Spec. Issue　54　71-79　2001
Latitudinal distribution of atmospheric CO2 sources and sinks inferred by delta C-13 measurements from 1985 to 1991 Peer-reviewed

S Morimoto, T Nakazawa, K Higuchi, S Aoki

JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES　105　(D19)　24315-24326　2000/10

DOI： 10.1029/2000JD900386 　

ISSN： 2169-897X
Variations of the carbon isotopic ratio in atmospheric CO2 over the last 250 years recorded in an ice core from H15, Antarctica Peer-reviewed

Kawamura, K, Nakazawa, T, Machida, T, Morimoto, S, Aoki, S, Ishizawa, M, Fujii, Y, Watanabe, O

Polar Meteorology and Glaciology　14　47-57　2000
Balloon operation for stratospheric air sampling at Antarctica Peer-reviewed

H Honda, N Yajima, T Yamagami, S Aoki, G Hashida, T Machida, S Morimoto

SCIENTIFIC BALLOONING　26　(9)　1369-1372　2000

DOI： 10.1016/S0273-1177(00)00063-6 　

ISSN： 0273-1177
Variations of the atmospheric carbon dioxide concentration and its isotope ratio over the last 250 years from an ice core drilled at H15, Antarctica Peer-reviewed

Kawamura, K, T. Nakazawa, T. Machida, S. Morimoto, S. Aoki, M. Ishizawa, Y. Fujii, O. Watanabe

Polar Meteorol. Glaciol.　14　47-57　2000
Publisher: National Institute of Polar Research
ISSN： 1344-3437

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Variations of δ^<13>C in atmospheric CO_2 were reconstructed for the period of 1724 to 1961 by analyzing a high-accumulation ice core drilled at H15,Antarctica. Measured values of δ^<13>C were corrected for the gravitational enrichment which occurred in the firn, on the basis of the analytical results of δ^<15>N in N_2 in the core. From the vertical profile of δ^<15>N calculated using a diffusion model for the firn, it was suggested that the air in the layer shallower than 17m depth was mixed well with the atmosphere over the firn surface. The average value of δ^<13>C during the period 1724-1775 was found to be -6.67±0.11‰. δ^<13>C decreased secularly from this value to -7.33‰ in 1961,and its trend was enhanced especially after the late 19th century, corresponding to the long-term increase of the CO_2 concentration. CO_2 fluxes estimated by deconvolution analysis of the reconstructed CO_2 concentrations with the box-diffusion model accounted for the observed variations of δ^<13>C fairly well. It was also suggested that a dip of δ^<13>C found at the end of the 18th century was attributable to terrestrial biospheric CO_2 emissions enhanced under high air temperatures.
Stratospheric air sampling balloon operation at antarctica Peer-reviewed

N. Izutsu, H. Honda, N. Yajima, S. Morimoto, S. Aoki

AIAA International Balloon Technology Conference, 1999　257-265　1999
Publisher: American Institute of Aeronautics and Astronautics Inc, AIAA
DOI： 10.2514/6.1999-3884 　
Stratospheric air sampling experiment at Syowa Station, Antarctica Peer-reviewed

H Honda, N Yajima, T Yamagami, N Izutsu, S Aoki, G Hashida, T Machida, S Morimoto, S Okano, T Yamanouchi, T Nakazawa

14TH ESA SYMPOSIUM ON EUROPEAN ROCKET AND BALLOON PROGRAMMES AND RELATED RESEARCH　437　161-166　1999

ISSN： 0379-6566
Improved scientific ballooning applied to the cryo-sampling experiment at Syowa Station Peer-reviewed

Yajima, N, H. Honda, S. Aoki, G. Hashida, S. Morimoto, T. Machida, S. Okano

Adv. Pol. Upper Atmos.Res.　13　167-175　1999
Publisher: National Institute of Polar Research
ISSN： 1345-1065

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On January 3, 1998, a large balloon (30000 m^3) was successfully launched at Syowa Station for the cryo-sampling of the stratospheric atmosphere. The sampling system splashed down in the Liitzow-Holm Bay and recovered by icebreaker SHIRASE. The cryo-sampling at Antarctica was the first trial in the world and the recovery of a heavy payload was also the first challenge at Syowa Station. A lot of new ballooning technologies were applied to this operation, such as compact balloon launching equipments, a reliable recovery system, a handy ground radio station for the balloon tracking and data acquisition and so forth. The realtime flight data could be received at National Institute of Polar Research (NIPR) in Tokyo by using the computer network via INMARSAT. At NIPR the collaboration members could monitor the entire process of the experiment at Syowa Station in detail and send some instructions and advice. This balloon experiment showed an extended possibility of a large scale scientific ballooning at Syowa Station. This paper deals with those newly developed balloon engineering technologies.
An overview and preliminary results from the Arctic Airborne Measurement Program 1998 Campaign Peer-reviewed

Shiobara, M, Y. Fujii, S. Morimoto, Y. Asuma, S. Yamagata, S. Sugawara, Y. Inomata, M. Watanabe, T. Machida

Polar Meteorol. Glaciol.　13　99-110　1999
Publisher: National Institute of Polar Research
ISSN： 1344-3437

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The Arctic Airborne Measurement Program (AAMP) was planned to investigate the transport, exchange and chemical processes of gas and aerosol in the Arctic atmosphere in early spring, and further to understand their roles in global change. An instrumented aircraft, Gulfstream II (G-II) twin-jet plane, was used for airborne measurements in the troposphere and lower stratosphere of the Arctic. For the AAMP 1998 campaign, G-II was equipped with CO_2 and O_3 concentration monitor systems, gas and aerosol sampling systems, aerosol particle counters, and the PMS 1D and 2D airborne particle probes. The aircraft was flown from Alaska, USA to Svalbard, Norway passing over the North Pole, and on the reverse route, in the first half of March 1998. The approximate cruising altitude was 12km for long-range flights. Vertical profiles of gas and aerosol concentrations were obtained over Spitsbergen, Svalbard and Barrow, Alaska. A convective cloud system associated with a polar low was observed over the Norwegian Sea. Another cloud observation was made for marine boundary layer clouds over the open sea off Spitsbergen. Most of the instruments on-board G-II worked well, and measurements were successfully acquired during the AAMP 1998 campaign.
Variations of carbon and oxygen isotopes of atmospheric carbon dioxide and their implications for the global carbon cycle

T. Nakazawa, S. Morimoto

Proceedings of the International Symposium on Atmospheric Chemistry and Future Global Environment　32-35　1997/11
Sources and sinks of atmospheric carbon dioxide deduced from its surface concentration and carbon isotopic data using a two-dimensional atmospheric transport model

S. Morimoto

Proceedings of the Fifth International Carbon Dioxide Conference　141-142　1997/09
Temporal and spatial variations of the carbon isotopic ratio of atmospheric carbon dioxide in the western Pacific region Peer-reviewed

Takakiyo Nakazawa, Shinji Morimoto, Shuhji Aoki, Masayuki Tanaka

Journal of Geophysical Research Atmospheres　102　(1)　1271-1285　1997
Publisher: Blackwell Publishing Ltd
DOI： 10.1029/96JD02720 　

ISSN： 0148-0227
昭和基地における大気中CO2 の炭素同位体比δ13Cと酸素同位体比δ18Oの変化 Peer-reviewed

Murayama S, Nakazawa T, Aoki S, Morimoto S

南極資料　41　(1)　177-190　1997

DOI： 10.15094/00008968 　

ISSN： 0085-7289
A small stratospheric grab-sampler and its ground support system for Antarctic experiments (abstract)

Honda, H, Akiyama, H, Yajima, N, Morimoto, S, Hashida, G, Yamanouchi, T, Aoki, S, Nakazawa, T

Proc. NIPR Symp. Polar Meteorol. Glaciol.　11　11, 264.-264　1997
Publisher: National Institute of Polar Research
ISSN： 0914-2037

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In order to measure the concentrations of various minor constituents and their isotopic ratios in the stratosphere over Antarctica, a simple grab sampling system was newly developed. The sampling system was designed to be launched by a small number of personnel under severe experimental conditions. Special attention was paid to minimize the contamination of sample air, as well as to allow easy handling of the system. The sampler consisted mainly of a 15l sample container with electromagnetic and manual valves, control electronics for executing the air sampling procedures and sending the position and status information of the sampler to the ground station, batteries and transmitter. All these parts were assembled in an aluminum frame gondola with a shock absorbing system for landing on sea ice. The sampler was equipped with a turn-over mechanism of the gondola to minimize contamination from materials in the gondola, as well as with a GPS receiver and a Rawinsonde for its tracking. Total weight of the sampler was about 11kg. The sampler was designed to launch using a 4.5-kg rubber balloon because of its easy handling and inflation operation compared with a plastic one. A cross parachute was used for its stable descending characteristics so that the shock absorber functioned properly at landing. To receive, display and store the position and status data of the sampling system at the ground station, a simple data acquisition system, with a portable receiver, a demodulator and a microcomputer, was also developed. A new gas handling system and procedures were prepared to simplify the injection of He gas into the balloon and the measurement of its lift. For recovery, two helicopters and conventional beacon searching systems were used; they were confirmed to work well in the recovery tests of the JARE 36th operations.
Carbon dioxide variations in the Greenland Sea Peer-reviewed

Aoki, S, S. Morimoto, H. Ito, T. Nakazawa, T. Yamanouchi, N. Ono, T. Vinje

Mem. Natl. Polar Res., Spec. Issue　51　299-306　1997
Temporal and spatial variations of the carbon isotopic ratio of atmospheric carbon dioxide in the western Pacific region Peer-reviewed

T Nakazawa, S Morimoto, S Aoki, M Tanaka

JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES　102　(D1)　1271-1285　1997/01

DOI： 10.1029/96JD02720 　

ISSN： 2169-897X

eISSN： 2169-8996
Report of atmospheric science observations at Ny-A°lesund, Svalbard. Peer-reviewed

Yamanouchi, T, Aoki, S, Morimoto, S, Wada, M

Proc. Int. Symp. Environmental Research in the Arctic, 19-21 July 1995, NIPR, Tokyo. Mem. Natl Inst. Polar Res., Spec. Issue　51, 153-163　1996
Cryogenic air sampling system for measurements of the concentrations of stratospheric trace gases and their isotopic ratios over Antarctica Peer-reviewed

H Honda, S Aoki, T Nakazawa, S Morimoto, N Yajima

JOURNAL OF GEOMAGNETISM AND GEOELECTRICITY　48　(9)　1145-1155　1996

DOI： 10.5636/jgg.48.1145 　

ISSN： 0022-1392
A newly developed grab sampling system for collecting stratospheric air over Antarctica Peer-reviewed

Honda, H, S. Morimoto, H. Akiyama, G. Hashida, S. Aoki, H. Ui, T. Nakazawa, N. Yajima, T. Yamanouchi

Antarct. Rec.　40　(2)　156-168　1996

DOI： 10.15094/00008930 　

ISSN： 0085-7289
Measurements of the oxygen isotopic ratio of atmospheric CO2 at Syowa Station, Antarctica. Peer-reviewed

Murayama, S, T. Nakazawa, S. Aoki, S. Morimoto, A. Shimizu, M. Hayashi, S. Kawaguchi, M. Tanaka

Polar Meteorol. Glaciol.　10　92-101　1996
Publisher: National Institute of Polar Research
ISSN： 0914-2037

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Ground-based and aircraft measurements of the δ^<18>O of atmospheric CO_2 were made at Syowa Station, Antarctica during 1989 and 1990. To minimize the possibility of exchange of oxygen atoms between CO_2 and water during storage in sampling flasks, CO_2 was extracted from each air sample at the station within a few days of its collection. The maximum of the seasonal δ^<18>O cycle at the station appeared in summer and the minimum in winter. The peak-to-peak amplitude of the cycle was 0.27‰. δ^<18>O of CO_2 was slightly lower in the upper troposphere than in the middle and lower troposphere over the station during the measurement period. These results are in good agreement with those at Cape Grim, Tasmania and over Bass Strait. From a comparison of the CO_2 measurements at and over Syowa Station and δ^<18>O at other stations, it is suggested that seasonally dependent atmospheric transport to the Antarctic region is one of the important processes determining the seasonal cycle and the height variation of δ^<18>O of CO_2 at the station.
MEASUREMENTS OF THE STRATOSPHERIC CARBON-DIOXIDE CONCENTRATION OVER JAPAN USING A BALLOON-BORNE CRYOGENIC SAMPLER Peer-reviewed

T NAKAZAWA, T MACHIDA, S SUGAWARA, S MURAYAMA, S MORIMOTO, G HASHIDA

GEOPHYSICAL RESEARCH LETTERS　22　(10)　1229-1232　1995/05

DOI： 10.1029/95GL01188 　

ISSN： 0094-8276
Time and Space Variations of the carbon isotopic ratio of atmospheric CO2 in the western Pacific region

S. Morimoto

Proceedings of the International Symposium on Global Cycles of Atmospheric Greenhouse Gases　209-215　1994/03
TIME AND SPACE VARIATIONS OF THE CARBON ISOTOPIC RATIO OF TROPOSPHERIC CARBON-DIOXIDE OVER JAPAN Peer-reviewed

T NAKAZAWA, S MORIMOTO, S AOKI, M TANAKA

TELLUS SERIES B-CHEMICAL AND PHYSICAL METEOROLOGY　45　(3)　258-274　1993/07

DOI： 10.1034/j.1600-0889.1993.t01-2-00004.x 　

ISSN： 0280-6509
Aircraft measurements of the carbon isotopic ratios of atmospheric carbon dioxide over Japan

T. Nakazawa, S. Morimoto

Circulation and Control of Man-Made Substances in Envitonment　150-153　1993/03

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スバールバル諸島ニーオルスン基地における大気中二酸化炭素,メタン,一酸化炭素濃度の変動

村山昌平, 森本真司, 後藤大輔, 青木周司, 中澤高清, 石島健太郎, 前田高尚, 石戸谷重之, 菅原敏, 藤田遼

日本気象学会大会講演予稿集　(113)　204　2018/04/30
改良型クライオサンプラー性能実証試験（2025年度国内申請実験）

森本真司, 菅原敏, 石戸谷重之, 豊田栄, 後藤大輔, 亀崎和輝, 本田秀之, 梅澤拓, 石島健太郎, 池田忠作, 飯嶋一征, 福家英之

2024年度大気球シンポジウム集録　2024/11
改良型クライオサンプラー性能実証試験（2024年度国内申請実験）

菅原, 敏, 森本,真司, 青木, 周司, 本田, 秀之, 中澤, 高清, 豊田, 栄, 石戸谷, 重之, 後藤, 大輔, 梅澤, 拓, 長谷部, 文雄, 石島, 健太郎, 飯嶋, 一征, 福家, 英之

大気球シンポジウム: 2023年度　2023/10/01
Publisher: 宇宙航空研究開発機構宇宙科学研究所(JAXA)(ISAS)

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レポート番号: isas23-sbs-037
ハロカーボン類の測定から得られた新たな⼤気年代：成層圏⼤気サンプリング実験の結果—New estimates of age of air in the stratosphere based on halocarbon analyses for balloon-based air samples

梅澤, 拓, 引地, 祥⼦, 森本, 真司, ⻫藤, 拓也, 菅原, 敏, UMEZAWA, Taku, HIKICHI, Shoko, MORIMOTO, Shinji, SAITO, Takuya, SUGAWARA, Satoshi

大気球シンポジウム: 2022年度 = Balloon Symposium: 2022　2022/11
Publisher: 宇宙航空研究開発機構宇宙科学研究所(JAXA)(ISAS)

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大気球シンポジウム 2022年度（2022年11月7-8日. ハイブリッド開催（JAXA相模原キャンパス& オンライン)) Balloon Symposium 2022 (November 7-8, 2022. Hybrid(in-person & online) Conference (Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)(ISAS)), Sagamihara, Kanagawa Japan 資料番号: SA6000177035 レポート番号: isas22-sbs-035
西太平洋域及び極域での大気中CH₄濃度とその炭素・水素同位体比の変動

森本真司, 保田真人, 藤田遼, 梅澤拓, 後藤大輔, 青木周司

日本気象学会大会講演予稿集(CD-ROM)　(122)　2022
クライオサンプリングによる成層圏大気の長期観測と今後の展開

菅原, 敏, 青木, 周司, 森本, 真司, 本田, 秀之, 中澤, 高清, 豊田, 栄, 石戸谷, 重之, 後藤, 大輔, 梅澤, 拓, 長谷部, 文雄, 石島, 健太郎, 飯嶋, 一征, 福家, 英之, 吉田, 哲也, SUGAWARA, Satoshi, AOKI, Shuji, MORIMOTO, Shinji, HONDA, Hideyuki, NAKAZAWA, Takakiyo@@TOYODA Sakae, ISHIDOYA, Shigeyuki, GOTO, Daisuke, UMEZAWA, Taku, HASEBE, Fumio, ISHIJIMA, Kentaro, IIJIMA, Issei, FUKE, Hideyuki, YOSHIDA, Tetsuya

大気球シンポジウム: 2021年度 = Balloon Symposium: 2021　2021/11
Publisher: 宇宙航空研究開発機構宇宙科学研究所(JAXA)(ISAS)

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大気球シンポジウム 2021年度（2021年11月1-2日. オンライン開催) Balloon Symposium 2021 (November 1-2, 2021. Online Meeting) 著者人数: 14名PDF再処理の為、2023年3月24日に差替資料番号: SA6000166031 レポート番号: isas21-sbs-031
Report of the fifth methane reference gas inter-comparison experiment for Japan from 2018 to 2019

Kawasaki, T, A. Kinoshita, Y. Sawa, A. Murata, S. Morimoto, S. Murayama, T. Machida, M. Sasakawa, K. Tsuboi

GAW Report　263　1-5　2021/05
大気中二酸化炭素の放射性炭素同位体比の変動

森本真司, 山田千夏, 関根光, 青木周司, 南雅代, 中村俊夫

年代測定研究　5　27-31　2021/04
Challenges in isotope measurement of atmospheric methane for better understanding of the global methane budget

梅澤拓, 寺尾有希夫, 遠嶋康徳, 丹羽洋介, 伊藤昭彦, 森本真司, CHANDRA Naveen, PATRA Prabir K.

日本地球化学会年会要旨集(Web)　68th　2021
マルチクロックトレーサーによる大気年代推定(B20-04結果速報)

菅原敏, 青木周司, 森本真司, 本田秀之, 豊田栄, 石戸谷重之, 後藤大輔, 梅澤拓, 長谷部文雄, 石島健太郎, 飯嶋一征, 吉田哲也, SUGAWARA Satoshi, AOKI Shuji, MORIMOTO Shinji, HONDA Hideyuki, TOYODA Sakae, ISHIDOYA Shigeyuki, GOTO Daisuke, UMEZAWA Taku, HASEBE Fumio, ISHIJIMA Kentaro, IIJIMA Issei, YOSHIDA Tetsuya

大気球シンポジウム: 2020年度 = Balloon Symposium: 2020　2020/11
Publisher: 宇宙航空研究開発機構宇宙科学研究所(JAXA)(ISAS)

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大気球シンポジウム 2020年度（2020年11月5-6日. 宇宙航空研究開発機構宇宙科学研究所(JAXA)(ISAS)）, 相模原市, 神奈川県著者人数: 12名資料番号: SA6000151015レポート番号: isas20-sbs-015
マルチクロックトレーサーによる大気年代の推定—Estimation of 'Age of Air' from Multi-Clock-Tracers

菅原, 敏, 青木, 周司, 森本, 真司, 稲飯, 洋一, 本田, 秀之, 豊田, 栄, 石戸谷, 重之, 後藤, 大輔, 梅澤, 拓, 長谷部, 文雄, 石島, 健太郎, Sugawara, Satoshi, Aoki, Shuji, Morimoto, Shinji, Inai, Yoichi, Honda, Hideyuki, Toyoda, Sakae, Ishidoya, Shigeyuki, Goto, Daisuke, Umezawa, Taku, Hasebe, Fumio, Ishijima, Kentaro

大気球シンポジウム: 2019年度 = Balloon Symposium: 2019　2019/11
Publisher: 宇宙航空研究開発機構宇宙科学研究所(JAXA)(ISAS)

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大気球シンポジウム 2019年度（2019年11月7-8日. 宇宙航空研究開発機構宇宙科学研究所(JAXA)(ISAS)）, 相模原市, 神奈川県 Balloon Symposium 2019 (November 7-8, 2019. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency(JAXA)(ISAS)), Sagamihara, Kanagawa Japan 著者人数: 11名資料番号: SA6000140003 レポート番号: isas19-sbs-003
南北両極域における大気中メタン濃度とその同位体比の変動

森本真司, 藤田遼, 梅澤拓, 後藤大輔, 青木周司

日本気象学会大会講演予稿集(CD-ROM)　(116)　2019
マルチクロックトレーサーによる大気年代の推定—Estimation of ‘Age of Air’ from Multi-Clock-Tracers

菅原, 敏, 青木, 周司, 森本, 真司, 稲飯, 洋一, 本田, 秀之, 豊田, 栄, 石戸谷, 重之, 後藤, 大輔, 梅澤, 拓, 長谷部, 文雄, 石島, 健太郎, Sugawara, Satoshi, Aoki, Shuji, Morimoto, Shinji, Inai, Yoichi, Honda, Hideyuki, Toyoda, Sakae, Ishidoya, Shigeyuki, Goto, Daisuke, Umezawa, Taku, Hasebe, Fumio, Ishijima, Kentaro

大気球シンポジウム: 平成30年度 = Balloon Symposium: 2018　2018/11
Publisher: 宇宙航空研究開発機構宇宙科学研究所(JAXA)(ISAS)

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大気球シンポジウム平成30年度（2018年11月1-2日. 宇宙航空研究開発機構宇宙科学研究所 (JAXA)(ISAS)）, 相模原市, 神奈川県 Balloon Symposium 2018 (November 1-2, 2018. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)(ISAS)), Sagamihara, Kanagawa Japan 著者人数: 11名資料番号: SA6000128025 レポート番号: isas18-sbs-025
東南極沿岸のH128地点で採取されたフィルン空気の組成

大藪幾美, 川村賢二, 川村賢二, 川村賢二, 北村享太郎, 森本真司, 青木周司, 藤田遼, 菅原敏, 本山秀明, 本山秀明, 櫻井俊光, 櫻井俊光, 荒井美穂

日本地球惑星科学連合大会予稿集(Web)　2018　ROMBUNNO.ACC29‐17 (WEB ONLY)　2018
マルチクロックトレーサーによる大気年代の推定—Estimation of 'Age of Air' from Multi-Clock-Tracers

菅原, 敏, 青木, 周司, 森本, 真司, 中澤, 高清, 稲飯, 洋一, 豊田, 栄, 石戸谷, 重之, 後藤, 大輔, 梅澤, 拓, 長谷部, 文雄, 石島, 健太郎, Sugawara, Satoshi, Aoki, Shuji, Morimoto, Shinji, Nakazawa, Takakiyo, Inai, Yoichi, Toyoda, Sakae, Ishidoya, Shigeyuki, Goto, Daisuke, Umezawa, Taku, Hasebe, Fumio, Ishijima, Kentaro

大気球シンポジウム: 平成29年度 = Balloon Symposium: 2017　2017/11
Publisher: 宇宙航空研究開発機構宇宙科学研究所(JAXA)(ISAS)

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大気球シンポジウム平成29年度（2017年11月9-10日. 宇宙航空研究開発機構宇宙科学研究所 (JAXA)(ISAS)）, 相模原市, 神奈川県 Balloon Symposium 2017 (November 9-10, 2017. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)(ISAS)), Sagamihara, Kanagawa Japan 著者人数: 11名資料番号: SA6000103003 レポート番号: isas17-sbs-003
南極上空成層圏において観測された大気の重力分離と周辺域の気象場との関係

石戸谷重之, 菅原敏, 稲飯洋一, 森本真司, 本田秀之, 池田忠作, 冨川喜弘, 豊田栄, 青木周司, 中澤高清

日本気象学会大会講演予稿集　(111)　191　2017/04/30
ユーラシア大陸上空の対流圏界面領域におけるCH₄の変動と炭素・水素同位体比に基づいたその解釈

藤田遼, 森本真司, 稲飯洋一, 青木周司, 町田敏暢, 澤庸介, 松枝秀和, 丹羽洋介, 坪井一寛, 勝又啓一, 梅澤拓, 中澤高清

日本地球惑星科学連合大会予稿集(Web)　2017　2017
2015年度秋季大会スペシャル・セッション「温室効果気体研究の観測・測定技術の進展による新たな展開」報告

町田敏暢, 村山昌平, 森本真司, 松枝秀和, 青木周司, 藤谷徳之助

天気　63　(2)　131-136　2016/02
Publisher: 日本気象学会
ISSN： 0546-0921
ユーラシア大陸上空の対流圏界面領域における大気中CH₄濃度とその炭素・水素同位体比の季節変動の解析

藤田遼, 森本真司, 青木周司, 町田敏暢, 澤庸介, 松枝秀和, 坪井一寛, 勝又啓一, 梅澤拓, 中澤高清

日本気象学会大会講演予稿集　(110)　2016
Vertical profiles of nitrous oxide isotopocules in the stratosphere over Japan

Watanabe Yuma, Honda Hideyuki, Ikeda Chusaku, Izutsu Naoki, Yoshida Tetsuya, Toyoda Sakae, Yoshida Naohiro, Shimada Tomohiro, Aoki Shuji, Morimoto Shinji, Nakazawa Takakiyo, Sugawara Satoshi, Ishidoya Shigeyuki

Abstracts of Annual Meeting of the Geochemical Society of Japan　63　(0)　112-112　2016
Publisher: GEOCHEMICAL SOCIETY OF JAPAN
DOI： 10.14862/geochemproc.63.0_112 　

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A156 大気中一酸化二窒素の同位体分子種(isotopocule)の長期観測(温室効果気体研究の観測・測定技術の進展による新たな展開,スペシャル・セッション)

豊田栄, 町田敏暢, 遠嶋康徳, 森本真司, Worthy Doug, 石島健太郎, 吉田尚弘

大会講演予講集　108　106-106　2015
Publisher: 日本気象学会
P169 温室効果ガス観測に関する相互比較実験(iceGGO)の結果(ポスター・セッション)

川崎照夫, 中澤高清, 青木周司, 森本真司, 後藤大輔, 町田敏暢, 遠嶋康徳, 向井人史, 勝又啓一, 村山昌平, 石戸谷重之, 加藤健次, 下坂琢哉, 青木伸行, 渡邉卓朗, 小出寛, 高橋正臣, 滝沢厚詩, 藤谷徳之助, 松枝秀和, 澤庸介, 坪井一寛

大会講演予講集　108　249-249　2015
Publisher: 日本気象学会
B202 北極域における船舶および地上観測による大気ポテンシャル酸素の変動要因の解明(物質循環I,一般口頭発表)

石戸谷重之, 田口彰一, 笹野大輔, 小杉如央, 内田裕, 森本真司, 青木周司, 村山昌平, 石井雅男, 遠嶋康徳, 西野茂人, 後藤大輔, 藤田遼, 弓場彬江, 石島健太郎, 中澤高清

大会講演予講集　107　204-204　2015
Publisher: 日本気象学会
カナダ・チャーチルにおける大気中CH₄濃度とその炭素・水素同位体比の変動

藤田遼, 森本真司, 梅澤拓, 石島健太郎, PATRA Prabir, PATRA Prabir, WORTHY Doug, 青木周司, 中澤高清

日本気象学会東北支部気象研究会・仙台管区気象台東北地方調査研究会合同発表会予稿集(Web)　2015　2015
カナダ・チャーチルにおける大気中メタン濃度とその炭素・水素同位体比の変動

藤田遼, 森本真司, 梅澤拓, DOUG Worthy, 青木周司, 中澤高清

日本地球惑星科学連合大会予稿集(Web)　2015　2015
P369 放出源別モデル計算を用いたメタンフラックスの最適化について(ポスター・セッション)

石島健太郎, Patra Prabir, Dlugokencky Ed, 伊藤昭彦, 町田敏暢, 遠嶋康徳, 梅澤拓, 青木周司, 森本真司, 中澤高清

大会講演予講集　108　(108)　2015
Publisher: 日本気象学会
大気の重力分離の観測に基づく成層圏大気循環の研究とその今後の展望

石戸谷重之, 菅原敏, 森本真司, 青木周司, 中澤高清, 本田秀之, 豊田栄, 稲飯洋一, 橋田元, 山内恭, 植松光夫, 長谷部文雄, 後藤大輔, 村山昌平

日本気象学会大会講演予稿集　107　(107)　59-59　2015
Publisher: 日本気象学会
クロック・トレーサーを用いたAOA推定の課題

菅原敏, 青木周司, 森本真司, 中澤高清, 石戸谷重之, 豊田栄, 本田秀之

日本気象学会大会講演予稿集　107　(107)　57-57　2015
Publisher: 日本気象学会
インドネシア上空成層圏の温室効果気体と重力分離の観測

菅原敏, 石戸谷重之, 青木周司, 森本真司, 中澤高清, 豊田栄, 池田忠作, 本田秀之, 稲飯洋一, 長谷部文雄, PUTRI Fanny A, 後藤大輔

日本気象学会大会講演予稿集　108　(108)　103-103　2015
Publisher: 日本気象学会
気候変動と炭素循環の包括的評価を目指した大気中アルゴン濃度と酸素濃度の高精度観測

石戸谷重之, 村山昌平, 遠嶋康徳, 坪井一寛, 後藤大輔, 田口彰一, 松枝秀和, 森本真司, 菅原敏

日本気象学会大会講演予稿集　108　(108)　105-105　2015
Publisher: 日本気象学会
Gravitational separation of major atmospheric components in the stratosphere observed using a balloon-borne cryogenic air sampler and its application to the middle atmospheric circulation study

ISHIDOYA Shigeyuki, SUGAWARA Satoshi, MORIMOTO Shinji, AOKI Shuji, NAKAZAWA Takakiyo, TOYODA Sakae, HONDA Hideyuki, HASHIDA Gen, MURAYAMA Shohei, YAMANOUCHI Takashi

JAXA research and development report　13　71-86　2014/03
Publisher: Japan Aerospace Exploration Agency
ISSN： 1349-1113

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Gravitational separation of major atmospheric components in the stratosphere was detected firstly, from our high-precision measurements of O2/N2, Ar/N2 and the isotopic ratios of N2, O2 and Ar for the air samples collected using a balloon-borne cryogenic sampler. The relationships between the measured variables agree well with those expected from gravitational separation but clearly differ from those expected from artificial fractionation due to thermal diffusion. Simulations with a 2-dimensional model showed that a relationship between gravitational separation and the age of air in the stratosphere would be significantly affected by changes in the Brewer-Dobson circulation, which indicated gravitational separation is usable as a new indicator of the stratospheric circulation. In this paper, we review the past studies about gravitational separation in the middle atmosphere as well as changes in the Brewer-Dobson circulation briefly, and then summarize the above findings and suggestion presented in our recent papers.
P404 スバールバル諸島ニーオルスン基地における大気中二酸化炭素、メタン、一酸化炭素濃度の連続観測(ポスターセッション)

村山昌平, 森本真司, 後藤大輔, 青木周司, 中澤高清, 松枝秀和, 坪井一寛, 石島健太郎, 藤田遼, 石戸谷重之, 宇佐美哲之

大会講演予講集　105　361-361　2014
Publisher: 日本気象学会
P116 酸素安定同位体観測により推定された飛騨高山サイトにおける夜間の生態系呼吸に対する土壌呼吸の割合の季節的変動(ポスター・セッション)

村山昌平, 高村近子, 渡辺力, 三枝信子, 伊藤昭彦, 森本真司, 石戸谷重之, 近藤裕昭, 中澤高清, 青木周司, 宇佐美哲之

大会講演予講集　106　198-198　2014
Publisher: 日本気象学会
大気観測に基づく地球規模炭素循環の研究

森本真司, 町田敏暢, 澤庸介, 石戸谷重之, 遠嶋康徳, 青木周司

天気　61　(11)　922-926　2014
Publisher: 日本気象学会
ISSN： 0546-0921
「みらい」MR12-E03北極航海において観測された大気ポテンシャル酸素の変動

石戸谷重之, 笹野大輔, 内田裕, 田口彰一, 遠嶋康徳, 松下隼士, 松下隼士, 石井雅男, 小杉如央, 石島健太郎, 森本真司, 森本真司, 西野茂人, 村山昌平, 後藤大輔, 後藤大輔, 中澤高清, 青木周司

極域科学シンポジウム講演予稿集(CD-ROM)　4th　2013
2012年秋季「極域・寒冷域研究連絡会」の報告 : 極域・寒冷域の雲をつかむ(研究会報告)

平沢尚彦, 杉本志織, 佐藤和敏, 藤吉康志, 森本真司

天気　60　(2)　137-140　2013
Publisher: 日本気象学会
ISSN： 0546-0921
C351 大気中酸素濃度観測に基づく全球炭素循環の研究(大気-陸面間の水・エネルギー・炭素フラックスに関する最新研究2013,スペシャル・セッション)

後藤大輔, 石戸谷重之, 森本真司, 青木周司, 中澤高清

大会講演予講集　104　553-553　2013
Publisher: 日本気象学会
南極成層圏大気の直接採取による温室効果気体の観測第54次隊実験報告

森本真司, 稲飯洋一, 青木周司, 菅原敏, 石戸谷重之, 豊田栄, 本田秀之, 菊池雅行, 山内恭, 中澤高清, 飯嶋一征, 井筒直樹, 吉田哲也

極域科学シンポジウム講演予稿集(CD-ROM)　4th　ROMBUNNO.OM,MORIMOTOSHINJI,1　2013
大気の重力分離シミュレーション

菅原敏, 石戸谷重之, 森本真司, 青木周司, 中澤高清, 本田秀之, 村山昌平

日本気象学会大会講演予稿集　104　(104)　81-81　2013
Publisher: 日本気象学会
航空機を用いた大気主成分濃度・同位体比の高精度観測とその今後の展望

石戸谷重之, 青木周司, 森本真司, 坪井一寛, 松枝秀和, 菅原敏, 中澤高清, 村山昌平, 後藤大輔, 澤庸介, 丹羽洋介, 田口彰一, PATRA Prabir K, 町田敏暢, 山内恭

日本気象学会大会講演予稿集　104　(104)　134-134　2013
Publisher: 日本気象学会
南極・昭和基地での成層圏大気採取実験―第54次観測隊実験報告―

森本真司, 稲飯洋一, 青木周司, 菅原敏, 石戸谷重之, 豊田栄, 本田秀之, 山内恭, 中澤高清, 飯嶋一征, 井筒直樹, 吉田哲也

日本気象学会大会講演予稿集　104　(104)　493-493　2013
Publisher: 日本気象学会
成層圏大気主成分の重力分離とその物質循環研究への応用の可能性

石戸谷重之, 菅原敏, 森本真司, 青木周司, 中澤高清, 本田秀之, 村山昌平

日本気象学会大会講演予稿集　101　(101)　96-96　2012
Publisher: 日本気象学会
白鳳丸熱帯東部太平洋気球観測によるTTL上端大気のage推定

稲飯洋一, 青木周司, 本田秀之, 菅原敏, 森本真司, 長谷部文雄, 植松光夫

日本気象学会大会講演予稿集　102　(102)　357-357　2012
Publisher: 日本気象学会
気球搭載型小型J‐Tサンプラーを用いた成層圏大気主成分重力分離の観測

石戸谷重之, 青木周司, 森本真司, 菅原敏, 稲飯洋一, 本田秀之, 中澤高清, 村山昌平, 植松光夫

日本気象学会大会講演予稿集　102　(102)　358-358　2012
Publisher: 日本気象学会
白鳳丸による東部太平洋赤道上での大気微量成分の総合観測

青木周司, 稲飯洋一, 中澤高清, 本田秀之, 飯嶋一征, 荘司泰弘, 松坂幸彦, 井筒直樹, 吉田哲也, 森本真司, 菅原敏, 豊田栄, 古谷浩志, 植松光夫, 松見豊, 長谷部文雄

日本気象学会大会講演予稿集　102　(102)　356-356　2012
Publisher: 日本気象学会
P353 フラックス観測、酸素安定同位体観測及び群落微気候モデルにより推定された飛騨高山サイトにおける各呼吸要素の季節的変動(ポスター・セッション)

村山昌平, 渡辺力, 高村近子, 三枝信子, 森本真司, 石戸谷重之, 近藤裕昭, 中澤高清, 青木周司, 宇佐美哲之

大会講演予講集　102　527-527　2012
Publisher: 日本気象学会
D451 大気中酸素濃度観測に基づく森林生態系の総一次生産と生態系呼吸の分離評価(物質循環,一般口頭発表)

石戸谷重之, 村山昌平, 高村近子, 近藤裕昭, 三枝信子, 後藤大輔, 森本真司, 青木周司, 中澤高清, 宇佐美哲之

大会講演予講集　101　489-489　2012
Publisher: 日本気象学会
大気球を用いた成層圏の二酸化炭素観測

青木周司, 中澤高清, 本田秀之, 菅原敏, 森本真司

日本気象学会大会講演予稿集　(100)　173　2011/10/31
北極域における大気中メタン濃度と同位体比の変動

森本真司, 梅澤拓, 青木周司, 中澤高清

極域科学・宙空圏・気水圏・生物・地学シンポジウム講演予稿集(CD-ROM)　2011　2011
B353 大気球を用いた成層圏の二酸化炭素観測(スペシャル・セッション「大気中の二酸化炭素観測手法の新たな展開とそのデータ利用」,一般口頭発表)

青木周司, 中澤高清, 本田秀之, 菅原敏, 森本真司

大会講演予講集　100　(0)　173-173　2011
Publisher: 日本気象学会
P165 三陸沿岸における大気中酸素濃度の連続観測(ポスター・セッション)

後藤大輔, 森本真司, 青木周司, 中澤高清

大会講演予講集　98　(0)　402-402　2010/09/30
Publisher: 社団法人日本気象学会
P113 南極・昭和基地における大気中酸素濃度の連続観測(ポスターセッション)

森本真司, 後藤大輔, 石戸谷重之, 青木周司, 中澤高清

大会講演予講集　97　(0)　230-230　2010/04/30
Publisher: 社団法人日本気象学会
P208 冷温帯落葉広葉樹林における大気中二酸化炭素の酸素同位体比の季節変動(ポスターセッション)

高村近子, 村山昌平, 中澤高清, 青木周司, 三枝信子, 森本真司

大会講演予講集　97　(0)　258-258　2010/04/30
Publisher: 社団法人日本気象学会
ISSN： 0918-7928
南極域成層圏における温室効果気体観測

森本真司, 菅原敏, 石戸谷重之, 豊田栄, 本田秀之, 青木周司, 中澤高清, 和田誠, 山内恭

極域科学・宙空圏・気水圏・生物・地学シンポジウム講演予稿集(CD-ROM)　2010　ROMBUNNO.PS07　2010
Stratospheric whole air sampling experiments at Syowa Station with compact cryogenic air samplers in JARE-49

Morimoto Shinji, Asano Hitoshi, Aoyama Tomoki, Yoshimi Hideshi, Uchida Hiroko, Mochizuki Takashi, Iwabuchi Masami, Mizuno Taiji, Tsutsumi Masaki, Honda Hideyuki, Iijima Issei, Yoshida Tetsuya, Yamanouchi Takashi, Wada Makoto

Antarctic record　53　(1)　95-109　2009/03/30
Publisher: National Institute of Polar Research
DOI： 10.15094/00009486 　

ISSN： 0085-7289

More details Close

As a part of summer observations of the 49th Japanese Antarctic Research Expedition, stratospheric whole air sampling experiments were conducted at Syowa Station using newly developed compact cryogenic air samplers. The compact sampler uses liquefied neon (produced in-situ) as a refrigerant to solidify or liquefy atmospheric constituents. Because of its reduced size and weight, the sampler can be launched using small-size balloons (1000–2000 m3 in volume). On December 30, 2007 and January 4, 2008, a total of 4 samplers were launched from Syowa Station and recovered on the same day as their launches. Two of them functioned as designed and collected stratospheric air samples at altitudes of 18 and 25 km. The air samples were analyzed for greenhouse gas concentrations and stable isotopes after return to Japan.
C103 仙台市青葉山、スバルバール諸島ニーオールスン、および南極昭和基地における大気中酸素濃度の変動から見積もられた全球炭素収支(微量気体)

石戸谷重之, 中澤高清, 青木周司, 森本真司

大会講演予講集　93　(0)　190-190　2008/04/30
Publisher: 社団法人日本気象学会
B104 仙台市郊外における大気中酸素濃度の高精度連続観測(微量気体・GOSAT)

後藤大輔, 森本真司, 石戸谷重之, 青木周二, 中澤高清

大会講演予講集　94　112-112　2008
Publisher: 日本気象学会
B103 ジュール・トムソン・ミニクーラーを用いた小型成層圏大気クライオサンプラーの開発(微量気体・GOSAT)

森本真司, 山内恭, 本田秀之, 菅原敏, 石戸谷重之, 青木周司, 中澤高清

大会講演予講集　94　111-111　2008
Publisher: 日本気象学会
第49次夏隊での温室効果気体観測報告

森本真司, 浅野比, 青山朋樹, 山内恭, 和田誠, 本田秀之, 菅原敏, 石戸谷重之, 後藤大輔, 青木周司, 中澤高清

極域気水圏シンポジウムプログラム・講演要旨　31st　60　2008
A464 極域成層圏大気の微量成分観測と大気の平均年代(南極大型大気レーダーを軸とした極域大気研究の可能性,専門分科会)

菅原敏, 中澤高清, 青木周司, 石戸谷重之, 森本真司, 橋田元, 山内恭, 本田秀之

大会講演予講集　93　102-102　2008
Publisher: 日本気象学会
D261 冷温帯落葉広葉樹林における大気中CO_2のδ^<18>Oの日変動(微量気体)

高村近子, 村山昌平, 三枝信子, 中澤高清, 青木周司, 森本真司

大会講演予講集　92　(0)　314-314　2007/09/30
Publisher: 社団法人日本気象学会
Development of a balloon-borne small-size cryogenic sampler to collect stratospheric whole-air sample.

森本真司, 山内恭, 中澤高清, 青木周司, 菅原敏

岩谷直治記念財団研究報告書　30　72-74　2007/08/01

ISSN： 0287-3532
P309 アラスカにおける航空機観測に基づいたメタン放出源の同位体比の推定

梅澤拓, 青木周司, 森本真司, 中澤高清, 町田敏暢

大会講演予講集　92　(92)　2007
Publisher: 日本気象学会
昭和基地における小型回収気球実験計画(成層圏大気クライオサンプリング)

森本真司, 山内恭, 和田誠, 橋田元, 中澤高清, 青木周司, 石戸谷重之, 菅原敏, 本田秀之, 飯嶋一征, 吉田哲也

極域気水圏シンポジウムプログラム・講演要旨　30th　69　2007
南極昭和基地における一酸化炭素濃度の変動

八代尚, 森本真司, 菅原敏, 須藤健悟, 中澤高清, 青木周司

極域気水圏シンポジウムプログラム・講演要旨　30th　99　2007
成層圏において観測された大気主要成分の重力分離

石戸谷重之, 菅原敏, 森本真司, 青木周司, 中澤高清

日本気象学会大会講演予稿集　91　(91)　148-148　2007
Publisher: 日本気象学会
北極域航空機観測計画(Arctic Airborne Measurement Program 2002,AAMP02)において観測された極渦内下部成層圏における大気主要成分の重力分離

石戸谷重之, 森本真司, 菅原敏, 渡井智則, 町田敏暢, 青木周司, 中澤高清, 山内恭

日本気象学会大会講演予稿集　92　(92)　310-310　2007
Publisher: 日本気象学会
P366 冷温帯落葉広葉樹林における大気中CO_2のδ^<18>Oの季節変化の年々変動

村山昌平, 高村近子, 三枝信子, 近藤裕昭, 森本真司, 山本晋, 中澤高清, 青木周司, 宇佐美哲之

大会講演予講集　92　511-511　2007
Publisher: 日本気象学会
フィルン空気分析より得られた20世紀後半における大気中一酸化二窒素濃度及びδ¹⁵Nとδ¹⁸Oの時間変動

石島健太郎, 菅原敏, 橋田元, 森本真司, 村山昌平, 川村賢二, 青木周司, 中澤高清

極域気水圏シンポジウムプログラム・講演要旨　29th　80　2006/11
JARE49での昭和基地における温室効果気体観測計画

森本真司, 山内恭, 和田誠, 橋田元, 中澤高清, 青木周司, 石戸谷重之, 菅原敏, 本田秀之

極域気水圏シンポジウムプログラム・講演要旨　29th　60　2006/11
日本上空の成層圏におけるCH₄の同位体比観測とCH₄消滅過程

梅沢拓, 青木周司, 中沢高清, 森本真司, 菅原敏

日本気象学会大会講演予稿集　89　(89)　99-99　2006/04/30
Publisher: 日本気象学会
Atmospheric observation room for clean air at Syowa Station, East Antarctica

Kazuo Osada, Masahiko Hayashi, Masataka Shiobara, Keiichiro Hara, Makoto Wada, Gen Hashida, Shinji Morimoto, Masanori Yabuki, Takashi Yamanouchi

50　(1)　86-102　2006/03
Publisher: 国立極地研究所
DOI： 10.15094/00009353 　

ISSN： 0085-7289
アラスカにおける大気メタン濃度および一酸化炭素濃度の観測

梅澤拓, 青木周司, 中澤高清, 森本真司, 町田敏暢

極域気水圏シンポジウムプログラム・講演要旨　29th　2006
Observation of the greenhouse effect gas in both the south and north polar regions.

森本真司, 青木周司, 中澤高清, 菅原敏, 橋田元, 山内恭

炭素循環および温室効果ガス観測ワークショップ講演要旨集平成18年　62-63　2006
極域成層圏大気中N₂Oアイソトポマー比の高度分布とその変動

豊田栄, 吉田尚弘, 菅原敏, 石戸谷重之, 橋田元, 弦間康二, 青木周司, 中沢高清, 森本真司, 山内恭, 鈴木香寿恵, 町田敏暢, 本田秀之, 青木伸行, 巻出義紘

極域気水圏シンポジウムプログラム・講演要旨　28th　103-104　2005/11
C109 中国における温室効果気体の観測(物質循環I)

佐伯田鶴, 菅原敏, 青木周司, 中澤高清, 石戸谷重之, Tang Jie, Zhang Dongqi, Shi Guang-Yu, Liu Yu-Zhi, 森本真司, 早坂忠裕, 石澤みさ

大会講演予講集　88　(0)　170-170　2005/10/31
Publisher: 社団法人日本気象学会
中国における温室効果気体の観測

佐伯田鶴, 菅原敏, 青木周司, 中沢高清, 石戸谷重之, TANG Jie, ZHANG Dongqi, SHI Guang‐Yu, LIU Yu‐Zhi, 森本真司, 早坂忠裕, 石沢みさ

日本気象学会大会講演予稿集　88　(88)　170-170　2005/10/31
Publisher: 日本気象学会
C110 日本上空の成層圏における二酸化炭素濃度の長期変動と対流圏成層圏間の非平衡について(物質循環I)

菅原敏, 青木周司, 中澤高清, 石戸谷重之, 町田敏暢, 橋田元, 森本真司, 本田秀之

大会講演予講集　88　171-171　2005/10/31
Publisher: 社団法人日本気象学会
中国における大気中の二酸化炭素とメタンの観測

菅原敏, 青木周司, 中澤高清, 石戸谷重之, 〓〓, 〓〓〓, 石廣玉, 〓玉芝, 森本真司, 佐伯田鶴, 早坂忠裕, 石澤みさ

大会講演予講集　87　(0)　436-436　2005/05/15
Publisher: 日本気象学会
P229 北極域における大気中メタンの炭素同位体比の変動

森本真司, 青木周司, 中澤高清, 山内恭

大会講演予講集　87　(0)　369-369　2005/04/30
Publisher: 社団法人日本気象学会
中国における大気中の二酸化炭素とメタンの観測

菅原敏, 青木周司, 中沢高清, ブツケツ, 石広玉, りゅう王芝, 森本真司, 佐伯田鶴, 石沢みさ

日本気象学会大会講演予稿集　(87)　436　2005/04/30
Meteorolagical Data at Japanese Ny-Ålesund Observatory, Svalbard in 2001 and 2002

Morimoto Shinji, Aoki Shuji, Wada Makoto, Yamanouchi Takashi

NIPR arctic data reports　6　1-112　2005/03
Publisher: National Institute of Polar Research
ISSN： 1342-4033
C108 冷温帯落葉広葉樹林における大気中CO_2濃度と安定同位体比の長期観測(物質循環I)

村山昌平, 三枝信子, 山本晋, 高村近子, 森本真司, 近藤裕昭, 中澤高清, 青木周司, 宇佐美哲之

大会講演予講集　88　169-169　2005
Publisher: 日本気象学会
クライオジェニックサンプラーを用いて観測された南極上空成層圏の酸素濃度

石戸谷重之, 橋田元, 菅原敏, 森本真司, 青木周司, 本田秀之, 町田敏暢, 豊田栄, 中沢高清

極域気水圏シンポジウムプログラム・講演要旨　27th　84　2004/12
クライオジェニックサンプラーを用いた南極上空における成層圏大気微量成分の観測

菅原敏, 橋田元, 石戸谷重之, 森本真司, 青木周司, 本田秀之, 町田敏暢, 豊田栄, 並木道義

極域気水圏シンポジウムプログラム・講演要旨　27th　83　2004/12
2.4. 昭和基地における温室効果気体観測(2. 第V期南極観測隊の成果)(2003年春季極域・寒冷域研究連絡会の報告)

森本真司

天気　51　(2)　140-140　2004

ISSN： 0546-0921
D355 南極およびグリーンランド氷床で採取されたフィルン空気の酸素濃度とそれにより推定された地球規模の二酸化炭素収支(物質循環III)

石戸谷重之, 川村賢二, 菅原敏, 青木周司, 中澤高清, 橋田元, 森本真司, 本山秀明, 藤井理行

大会講演予講集　84　295-295　2003/10/15
Publisher: 社団法人日本気象学会
D356 フィルン空気より推定された過去の大気中N_2Oの濃度及び同位体の変動(物質循環III)

石島健太郎, 村山昌平, 菅原敏, 橋田元, 川村賢二, 森本真司, 中澤高清, 青木周司

大会講演予講集　84　296-296　2003/10/15
Publisher: 社団法人日本気象学会
南極・昭和基地における一酸化炭素濃度の連続観測

森本真司, 和田誠, 山内恭, 菅原敏, 中島裕之, 青木周司, 中沢高清

日本気象学会大会講演予稿集　83　(83)　253-253　2003/05
Publisher: 日本気象学会
Atmospheric CO2 Concentration Observed at Syowa Station from 1992 to 2001

Morimoto Shinji, Aoki Shuji, Nakazawa Takakiyo, Hashida Gen, Yamanouchi Takashi

JARE data reports. Meteorology　35　1-62　2003/01
Publisher: National Institute of Polar Research
ISSN： 0075-3343
P348 アジア-北極域下部成層圏における硫化カルボニル(COS)の濃度の緯度分布

猪股弥生, 岩坂泰信, 森本真司, 和田誠, 山内恭

大会講演予講集　84　427-427　2003/01
Publisher: 社団法人日本気象学会
北極域における六フッ化硫黄(SF₆)濃度の空間分布

河原卓, 菅原敏, 青木周司, 石戸谷重之, 中沢高清, 森本真司, 和田誠, 山内恭

日本気象学会大会講演予稿集　82　(82)　131-131　2002/10
Airborne observation of CO2 mixing ratio in the Arctic troposphere and lower stratosphere.

町田敏暢, MAKSYUTOV S, 菅原敏, 森本真司

南極資料　46　(1A)　125-138　2002/06/28

DOI： 10.15094/00009209 　

ISSN： 0085-7289
Airborne measurements of greenhouse gases during AAMP 98.

菅原敏, 森本真司, 青木周司, 中沢高清

南極資料　46　(1A)　147-154　2002/06/28

DOI： 10.15094/00009211 　

ISSN： 0085-7289
Continuous measurements of the ozone concentration in the Arctic Airborne Measurement Program 1998 (AAMP98) (in Japanese)

Shinji Morimoto

46　(1)　139-146　2002/06

ISSN： 0085-7289
グリーンランド海・バレンツ海における大気海洋間CO_2フラックスの推定に関する研究

中岡慎一郎, 青木周司, 中澤高清, 橋田元, 森本真司

大会講演予講集　81　253-253　2002/05
Meteorological Data at Japanese Ny-Ålesund Observatory, Svalbard in 1999 and 2000

Morimoto Shinji, Aoki Shuhji, Nakanishi Yuji, Wada Makoto, Yamanouchi Takashi

NIPR arctic data reports　5　1-204　2002/03
Publisher: National Institute of Polar Research
ISSN： 1342-4033
北極・ニーオルスンにおけるCO_2濃度と炭素同位体比の変動

森本真司, 青木周司, 中澤高清, 山内恭

大会講演予講集　79　(0)　248-248　2001/05/08
対流圏におけるメタンの炭素同位体比の変動

池上雅明, 中澤高清, 青木周司, 菅原敏, 村山昌平, 森本真司, 橋田元

大会講演予講集　79　244-244　2001/05/08
Latitudinal distribution of atmospheric CO2 sources and sinks inferred by δ13C measurements from 1985 to 1991

Shinji Morimoto, Takakiyo Nakazawa, Kaz Higuchi, Shuji Aoki

Journal of Geophysical Research Atmospheres　105　(19)　24315-24326　2000/10/16
Publisher: Blackwell Publishing Ltd
DOI： 10.1029/2000JD900386 　

ISSN： 0148-0227
日本上空の対流圏における二酸化炭素濃度と炭素安定同位体比の変動

松本文雄, 中沢高清, 青木周司, 森本真司, 菅原敏

日本気象学会大会講演予稿集　(78)　238　2000/10
対流圏における硫化カルボニルの濃度の緯度分布

猪股弥生, 松永捷司, 菅原敏, 森本真司, 長田和雄, 渡辺征春, 塩原匡貴, 岩坂泰信

日本気象学会大会講演予稿集　(77)　124　2000/05
Meteorological Data at Japanese Ny-Ålesund Observatory, Svalbard from 1996 to 1998

Morimoto Shinji, Aoki Shuhji, Nakanishi Yuji, Wada Makoto, Yamanouchi Takashi

NIPR arctic data reports　4　1-254　2000/03
Publisher: National Institute of Polar Research
ISSN： 1342-4033
Atmospheric CO2 concentartion observed at Syowa Station from 1984 to 1992

S. Aoki, T. Nakazawa, S. Morimoto, G. Hashida, M. Shiobara, T. Yamanouchi

JARE DATA REPORT　34　252 (Meteorology 36), 1-55-55　2000

ISSN： 0075-3343
AAMP'98で観測された下部成層圏でのオゾン濃度のメソスケール変動

遊馬芳雄, 森本真司, 塩原匡貴, KENT MOORE G. W., RENFREW IAN A.

大会講演予講集　76　327-327　1999/11/24
北極域対流圏及び下部成層圏における二酸化炭素濃度の航空機観測

町田敏暢, 菅原敏, 森本真司, 塩原匡貴

日本気象学会大会講演予稿集　75　(75)　142　1999/04/26
北極成層圏下部におけるメタンと二酸化炭素の同位体観測

菅原敏, 森本真司, 塩原匡貴, 中沢高清, 青木周司

日本気象学会大会講演予稿集　75　(75)　143　1999/04/26
Feasibility Study for Recovering Balloon Payload at Syowa Station, Antarctica

HONDA Hideyuki, HASHIDA Gen, MORIMOTO Shinji, AOKI Shuji, YAMANOUCHI Takashi, NAKAZAWA Takakiyo

39　57-66　1999/03
Publisher: Japan Aerospace Exploration Agency
ISSN： 0285-9920

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Recovering a balloon payload is indispensable for an experiment of the cryogenic air sampling. A recovery operation, however, has never been made at Syowa Station, Antarctica. Therefore, we examined possibility of a payload recovery at the station. We simulated balloon trajectories and determined landing positions by using a typical flight pattern of the cryogenic sampler and the aerological data obtained at the station for the summer seasons of 1988-1996. The results indicate that at least 40% of all landing positions were within 60km from the station for each summer and the distance between the landing position and the station varied with time smoothly. Variations in the surface wind condition were also examined for the same periods, and we confirmed that there were three to six chances to preform such an experiment for each summer. Sea ice conditions around the station were surveyed using satellite images and it was found that the sea ice was quite stable throughout the summer for the last 10 years. We are finally convinced that it can be possible to recover a payload using a helicopter at the station.
南極昭和基地における成層圏大気のクライオジェニックサンプリング実験[Ⅱ] －打ち上げおよび回収オペレーション－

青木周司, 橋田元, 町田敏暢, 岡野章一, 山内恭, 森本真司, 本田秀之, 並木道義, 矢島信之, 中澤高清

宇宙科学研究所報告　特集39号, 87-106　1999
南極昭和基地における成層圏大気のクライオジェニックサンプリング実験[Ⅰ] －新たに開発された搭載機器および地上システム－

本田秀之, 井筒直樹, 森本真司, 青木周司, 橋田元, 町田敏暢, 岡野章一, 矢島信之, 山上隆正, 並木道義, 他気球グループ

宇宙科学研究所報告　特集39号, 67-86　1999
南極昭和基地の気球実験における観測機回収に関する検討

本田秀之, 橋田元, 森本真司, 青木周司, 山内恭, 中澤高清

宇宙科学研究所報告　特集39号　1999
Carbonyl Sulfide(COS) concentration in the troposphere and lower stratosphere over middle-high latitude of Northern Hemisphere.

猪股弥生, 松永捷司, 菅原敏, 森本真司, 長田和雄, 岩坂泰信, 渡辺征春, 塩原匡貴

日本地球化学会年会講演要旨集　1998　30　1998/10
Concentration distribution of carbon oxysulfide (COS) in the lower stratosphere - troposphere of high latitude Northern Hemisphere measured by arctic aircraft meteorological project (AAMP98).

猪股弥生, 松永捷司, 菅原敏, 森本真司, 長田和雄, 岩坂泰信, 渡辺征春, 塩原匡貴

日本気象学会大会講演予稿集　74　(74)　313　1998/10
大気球を用いた南極成層圏大気のクライオジェニックサンプリング実験

青木周司, 橋田元, 町田敏暢, 森本真司, 岡野章一, 山内恭, 本田秀之, 矢島信之, 中澤高清, 川村賢二, 菅原敏

大会講演予講集　74　C105　1998/10
Aircraft observation of Carbonyl Sulfide(COS) concentration in the trophosphere and lower stratophere over middle-high latitude of Northern Hemisphere.

猪股弥生, 松永捷司, 長田和雄, 岩坂泰信, 渡辺征春, 菅原敏, 森本真司, 塩原匡貴

エアロゾル科学・技術研究討論会　15th　263-265　1998
A FUTURE PLAN FOR ATMOSPHERIC OBSERVATIONS USING UMMANNED AIRCRAFT

YAMANOUCHI Takashi, WADA Makoto, SHIOBARA Masataka, HIRASAWA Naohiko, HASHIDA Gen, MORIMOTO Shinji, NAKAZAWA Takakiyo, AOKI Shuhji, YAJIMA Nobuyuki, HONDA Hideyuki, IWASAKA Yasunobu, KONDO Yutaka

Proceedings of the NIPR Symposium on Polar Meteorology and Glaciology　11　257-257　1997/11
Publisher: National Institute of Polar Research
ISSN： 0914-2037

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Atmospheric observations using unmanned aircraft have been planned for the polar atmospheric sciences, firstly in the Arctic under the "International Cooperative Research on Arctic Environment Observations". The plan is to obtain the three-dimensional distribution of atmospheric parameters such as concentration of greenhouse gases, aerosols, water vapor and radiation. In the Arctic, we have been observing CO_2 and CH_4 concentration by air sampling, continuous measurement of surface ozone, measurements of cloud, aerosols and radiation at the surface of Ny-Alesund, Svalbard. In addition, it is indispensable to have the vertical and horizontal distribution of these parameters in order to know the transportation process or material cycle. The observation flights are to be made from the northern coast of Norway passing over the Greenland Sea and Svalbard to the Arctic Ocean. The higher priorities are the sinks and sources of CO_2,spring depletion of surface ozone, mechanism of stratospheric ozone hole and dynamics of Arctic haze. The aircraft to be used is "Perseus B" of Aurora Flight Sciences (Manasas, Virginia, U. S. A.), developed at the beginning of the 1990s, aiming to reach higher than 20km in the stratosphere with low-cost by a remotely piloted system. This aircraft will have a long flight duration, about 40 hours, and range of about 10000km at an altitude of 15km with a payload of 150kg. However, the payload section is limited to only about 0.2m^3. A new compact air sampling system with a cryogenic pump using the Joule-Thomson effect of highly pressurized neon is also under development at NIPR.
大気中のCO2濃度及びCO2の炭素同位体比の観測から導出したCO2放出源・吸収源の分布

森本真司, 中澤高清, 青木周司, HIGUCHI Kaz

大会講演予講集　72　(0)　D305　1997/10
グリーンランド海およびバレンツ海における大気-海洋間のCO_2交換に関する研究

吉村悟, 青木周司, 中澤高清, 森本真司, 橋田元, 白沢邦男, VINGE T

大会講演予講集　71　305-305　1997/05
Measurements of the Concentrations of CO_2,CH_4 and N_2O and the Carbon Isotopic Ratio of CH_4 in the Stratosphere Using a Balloon-borne Cryogenic Sampler

SUGAWARA Satoshi, NAKAZAWA Takakiyo, AOKI Shuji, MACHIDA Toshinobu, MORIMOTO Shinji, MURAYAMA Shohei, HASHIDA Gen, KAWAMURA Kenji, HONDA Hideyuki, ITOH Tomizo

34　103-120　1997/03
Publisher: Japan Aerospace Exploration Agency
ISSN： 0285-9920

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Stratospheric air samples have been collected over Japan during the period from 1985 to 1995 using a balloon-borne cryogenic sampler, and then analyzed for the CO_2,CH_4 and N_2O concentrations and the carbon isotopic ratio of CH_4. The results showed that the CO_2 concentration decreased with height in an interval from the tropopause to 20-25km, and then became almost constant values above this level. The concentration differences between the lowermost part of the stratosphere and heights above 20-25km amounted to 4-8 ppmv. The lower stratospheric CO_2 showed different profiles for different measurements, probably due to annually- and seasonally-dependent poleward air transport and vertical mixing of stratospheric air near the jet stream. An average increase rate of the stratospheric CO_2 concentration was estimated to be 1.50 (±0.04) ppmv/year from the data above 20-25km. The CH_4 and N_2O concentrations decreased rapidly from about 1750 and 311 ppbv at the tropopause to 550-900 and 30-70 ppbv at 35km, respectively, due to their strong destruction through photolysis and chemical reactions. δ^<13>C value of CH_4 increased markedly with height, from -47‰ just above the tropopause to about -39‰ at 35km, which is quite opposite to the vertical profile of the CH_4 concentration. It was strongly suggested that the destruction of CH_4 by the reaction with Cl atoms is responsible for this steep vertical profile of δ^<13>C.
Variations of the Carbon Isotopic Ratio of Tropospheric Carbon Dioxide over Japan

Morimoto Shinji

44　(6)　379-388　1997
Publisher: 日本気象学会
ISSN： 0546-0921
大気球を用いた成層圏大気中のメタン炭素同位体比の観測

菅原敏, 中沢高清, 白川泰樹, 川村賢二, 青木周司, 町田敏暢, 森本真司, 本田秀之

大気球シンポジウム　1995　45-46　1996/03
Observation of carbon isotope ratio of methane in stratosphere using balloon.

中沢高清, 菅原敏, 白川泰樹, 川村賢二, 青木周司, 町田敏暢, 森本真司, 本田秀之

日本気象学会大会講演予稿集　(68)　257　1995/10
CRYOGENIC WHOLE AIR SAMPLING IN THE STRATOSPHERE OVER THE ANTARCTIC : PROBLEMS AND COUNTERMEASURES

HONDA Hideyuki, YAJIMA Nobuyuki, YAMANOUCHI Takashi, AOKI Shuhji, MORIMOTO Shinji, NAKAZAWA Takakiyo

Proceedings of the NIPR Symposium on Polar Meteorology and Glaciology　9　191-191　1995/09
Publisher: National Institute of Polar Research
ISSN： 0914-2037

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A stratospheric air sampling project is planned over Syowa Station, Antarctica, in the 39th Japanese Antarctic Research Expedition, 1997. It will be carried out in cooperation with the Institute of Space and Astronautical Science (ISAS) Scientific Ballooning Section. The sampling system is based on the cryogenic whole air sampler which has been used since 1985 at Sanriku Balloon Center of ISAS. The sampling system and its operation are improved for Antarctic use; it includes a shorter sampling-time system, a payload positioning system, a recovery-on-land (ice) system, simplified launching and recovery operation systems, etc. A smaller and simplified sampling system will also be developed and introduced. It will require a few stuffs for launching operation and payload preparation at Syowa Station.
日本上空における大気中二酸化炭素の酸素同位体比の観測

中澤高清, 遠井充子, 石澤みさ, 田中正之, 森本真司, 青木周司

大会講演予講集　67　(0)　235-235　1995/05/15
VARIATIONS OF CARBON ISOTOPIC RATIO OF ATMOSPHERIC CARBON DIOXIDE OVER JAPAN

NAKAZAWA Takakiyo, MORIMOTO Shinji, AOKI Shuhji, TANAKA Masayuki

Proceedings of the NIPR Symposium on Polar Meteorology and Glaciology　6　148-148　1992/12
Publisher: National Institute of Polar Research
ISSN： 0914-2037

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Carbon dioxide samples collected in the troposphere over Japan during the periods from April 1984 to November 1990 were analyzed for the carbon isotope ratio, δ^<13>C, with a precision of 0.03‰ (one standard deviation). The seasonal cycle of δ^<13>C decreased with increasing height, with a phase delay of about one month between the lower and upper troposphere, which was quite similar to that of the CO_2 concentration. It was found from the observed seasonal cycles of the CO_2 concentration and δ^<13>C that the rate of change in δ^<13>C with respect to the CO_2 concentration is about -0.05‰ per ppmv. This implies that the seasonal CO_2 cycle over Japan is mainly induced by seasonally dependent biospheric activities. However, the air transport from different latitudes is also important for the seasonal CO_2 cycle, especially in the upper troposphere. δ^<13>C decreased secularly at an average rate of about -0.03‰ per year due mainly to combustion of fossil fuels with lighter CO_2 relative to the atmospheric CO_2. Irregular variations of δ^<13>C with the periods of two or three years, superimposed on the secular trend, were also observed; they were almost in phase with these of the CO_2 concentration. From the comparison of both irregular variations, it was found that the cause could primarily attributed to the imbalance in CO_2 exchange between the atmosphere and biosphere in association with climate change, rather than between the atmosphere and oceans.

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Books and Other Publications 3

北極域の研究 : その現状と将来構想

北極環境研究コンソーシアム長期構想編集委員会, 北極環境研究コンソーシアム

海文堂出版　2024/03

ISBN: 9784303562304
低温環境の科学事典

森本真司

朝倉書店　2016

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河村公隆（代表）編
地球環境システムー温室効果気体と地球温暖化

中澤高清, 青木周司, 森本真司

共立出版　2015/05/25

ISBN: 9784320047136

Presentations 195

Stable isotopes of atmospheric methane show strong increases in microbial methane emissions between 2020-2022

Sylvia Michel, Xin Lan, John Miller, Pieter Tans, Hinrich Schaefer, Reid Clark, Peter Sperlich, Gordon Brailsford, Shinji Morimoto, Heiko Moossen, Jianghanyang Li

AGU Fall Meeting　2024/12/13
Japanese observation programs of atmospheric greenhouse gases at Syowa Station, Antarctica and Ny-Alesund, Svalbard

Goto, D., S. Morimoto, S. Ishidoya, S. Murayama, S. Toyoda, S. Sugawara

15th Symposium on Polar Science　2024/12/03
成層圏大気の直接採取による温室効果気体及び関連気体の高精度観測

森本真司, 菅原敏, 石戸谷重之, 豊田栄, 後藤大輔, 亀崎和輝, 本田秀之

地球電磁気・地球惑星圏学会　2024/11/25
陸上生物活動に伴う大気中酸素及び二酸化炭素の変動―酸素／二酸化炭素交換比の再評価―

石戸谷重之, 村山昌平, 後藤大輔, 坪井一寛, 近藤裕昭, 青木伸行, 前田高尚, 森本真司, 石島健太郎, 亀崎和輝, 長谷川朝香, 青木周司, 中澤高清

日本気象学会秋季大会　2024/11/15
ハロカーボン濃度に基づく日本上空の成層圏空気の平均年代の推定

梅澤拓, 菅原敏, 引地祥子, 森本真司, 斉藤拓也, P.B. Krummel, P.J.Fraser, dR.F.Weiss

日本気象学会秋季大会　2024/11/12
Vertical distribution of stratospheric N2O isotopocules and its temporal variation over Japan and Antarctic

Toyoda, S., S. Morimoto, H. Honda, S. Aoki, T. Nakazawa, S. Sugawara, S. Ishidoya, D. Goto, C. Ikeda, N. Yoshida

The 11st International symposium on Isotopomers　2024/11/15
改良型クライオサンプラー性能実証試験

森本真司, 菅原敏, 石戸谷重之, 豊田栄, 後藤大輔, 亀崎和輝, 本田秀之, 梅澤拓, 石島健太郎, 池田忠作, 飯嶋一征, 福家英之

2024年度大気球シンポジウム　2024/10/22
大気ポテンシャル酸素とアルゴン濃度の広域観測

石戸谷重之, 遠嶋康徳, 坪井一寛, 後藤大輔, 丹羽洋介, 石島健太郎, 青木伸行, 寺尾有希夫, 奈良英樹, 菅原敏, 森本真司, 中岡慎一郎, 村山昌平

大気化学討論会　2024/10/10
Carbon and hydrogen isotope ratios of methane in the upper troposphere/lowermost stratosphere observed by commercial airliners

Ryo Fujita, Shinji Morimoto, Toshinobu Machida, Kazuhiro Tsuboi, Yousuke Sawa, Hidekazu Matsueda, Kentaro Ishijima, Taku Umezawa, Yosuke Niwa, Motoki Sasakawa, Daisuke Goto, Yoichi Inai, Shuji Aoki, Takakiyo Nakazawa

22nd WMO/IAEA Meeting on Carbon Dioxide, Other Greenhouse Gases and Related Tracers Measurement Techniques (GGMT-2024)　2024/08/06
Metrological challenges due to the absence of CRM for CH4 isotopes: developing community reference gases for CH4¬ isotopes in air and measuring laboratory differences with round robins

Peter Sperlich, Gordon Brailsford, Rowena Moss, Tony Bromley, Sally Gray, Ross Martin, Sarah Bury, Heiko Moossen, Michael Rothe, Heike Geilmann, Willi Brand, Sylvia Englund-Michel, Taku Umezawa, Thomas Röckmann, Carina van, der Veen, Dave Lowry, Jochen Schmi, Shinji Morimoto, Tim Arnold, Michael Dyonisius, Tomas Blunier, Ed Brook, Ben Riddell-Young, Martina Schmid, Lukas Kohl, Joachim Mohn, Federica Camin

22nd WMO/IAEA Meeting on Carbon Dioxide, Other Greenhouse Gases and Related Tracers Measurement Techniques (GGMT-2024)
The next stage of observation project for atmospheric greenhouse gases by commercial aircraft -CONTRAIL-

Machida, T., Y. Niwa, K. Tsuboi, T. Umezawa, K. Ishijima, R. Fujita, H. Matsueda, M. Sasakawa, D. Goto, S. Murayama, S. Morimoto

11th International Carbon Dioxide Conference　2024/07/30
南極やまと山脈南部の裸氷帯で掘削されたアイスコアの年代決定

荻原勇輝, 大藪幾美, 川村賢二, 北村享太郎, 森本真司, 青木周司

Japan Geoscience Union　2024/05/29
Temporal variations of the mole fraction and isotope ratios of atmospbheric methane over Japan and in the polar regions

Takahashi, M., S. Morimoto, R. Fujita, S. Maksyutov, T. Umezawa, D. Goto, T.Tsuboi, M. Sasakawa, T. Machida

Japan Geoscience Union　2024/05/27
A preliminary case study on low-cost sensor system towards building a dense CO2 monitoring network

Fujita, R., K. Tsuboi, K. Ishijima, Y. Inai, S. Ishidoya, T. Maeda, K. Kamezaki, S. Murayama, S.Morimoto, S. Takatsuji, Y. Fukuda, M. Yoshida, N. Ushio, S. Fujiwara, K. Yamada, T. Ishihara, Y. Matsuoka

Japan Geoscience Union　2024/05/27
Refining methane emission trends (1990-2020) through CH4 and δ 13C-CH4 observations

Chandra, N, P. K. Patra, R. Fujita, L. H. Isaksson, T. Umezawa, D. Goto, S. Morimoto, B. H. Vaughn, T. Rockmann

AGU Fall Meeting
成層圏CO2のd13Cの数値シミュレーション

菅原敏, 石戸谷重之, 森本真司, 梅澤拓, 後藤大輔, 長谷部文雄, 豊田栄, 青木周司, 中澤高清, 本田秀之

大気化学討論会
大気中O2/N2比の測定スケール統一に向けた国内機関による大気サンプル分析値の相互比較

石戸谷重之, 遠嶋康徳, 青木伸行, 原澤圭, 後藤大輔, 森本真司

大気化学討論会
スバールバル諸島ニーオルスンで観測された化石燃料起源イベントの-ΔO2/ΔCO2交換比解析

後藤大輔, 関根光, 森本真司

大気化学討論会
南極昭和基地における大気中の一酸化二窒素の変動

森本真司, 大野滉貴, 赤井章吾, 後藤大輔, 石戸谷重之

大気化学討論会
Analysis of short-term variations of atmospheric CO2 and O2 observed at Ny-Ålesund, Svalbard

Daisuke Goto, Hikaru Sekine, Shinji Morimoto

14th Symposium on Polar Science　2023/11/15
Can we achieve our compatibility goals in measurements of stable isotopes of atmospheric CO2?

Sylvia Michel, Pieter Tans, John Miller, John Ortega, Kerstin Braun, Reid Clark, Bruce Vaughn, Heiko Moossen, Michael Rothe, Colin Allison, Ray Langenfelds, Elise-Andree Guerette, Ralph Keeling, Eric Morgan, Gordon Brailsford, Rowena Moss, Peter Sperlich, Rahul Peethambaran, Hitoshi Mukai, Shohei Nomura, Yukio Terao, Lin Huang, Shinji Morimoto

Workshop in Carbon Dioxide and Methane Stable Isotope Ratio Measurements
スバールバル諸島ニーオルスンにおける大気中酸素窒素比・二酸化炭素濃度の長期及び短周期変動

原澤圭, 森本真司, 後藤大輔, 石戸谷重之, 青木周司

日本気象学会秋季大会
改良型クライオサンプラー性能実証試験

菅原敏, 森本真司, 青木周司, 本田秀之, 中澤高清, 豊田栄, 石戸谷重之, 後藤大輔, 梅澤拓, 長谷部文雄, 石島健太郎, 池田忠作, 飯嶋一征, 福家英之

大気球シンポジウム
Interannual variations in (APO) and (Ar/N2) at the surface and gravitational separation in the stratosphere

Shigeyuki Ishidoya, Satoshi Sugawara, Yasunori Tohjima, Daisuke Goto, Shinji Morimoto, Kazuhiro Tsuboi, Shohei Murayama, Kentaro Ishijima, Nobuyuki Aoki, Yosuke Niwa, Sakae Toyoda, Hideyuki Honda, Shuji Aoki, Takakiyo Nakazawa, Yoichi Inai, Fumio Hasebe

4th Atmospheric Oxygen Workshop
Short-term and long-term variations of atmospheric CO2 and O2 observed at Ny-Ålesund, Svalbard

Daisuke Goto, Hikaru Sekine, Kei Harasawa, Shohei Murayama, Shinji Morimoto, Shigeyuki Ishidoya

4th Atmospheric Oxygen Workshop
Growing emissions and Asian monsoon as dominant factor for atmospheric greenhouse gas variations over Asia

Umezawa, T, Y. Terao, T. Machida, Y. Niwa, T. Saito, T. Sasakawa, Y. Tohjima, H. Matsueda, K. Tsuboi, K. Ishijima, R. Fujita, N. Chandra, P. Patra, S. Aoki, T. Nakazawa, S. Morimoto

5th ACAM workshop　2023/06/07
Verifying global fugitive fossil fuel CH4 emission trends using atmospheric CH4 and δ 13C-CH4 observations.

Chandra, N, P. K. Patra, R. Fujita, L. H. Isaksson, T. Umezawa, D. Goto, S. Morimoto

日本地球惑星科学連合大会
Long-term changes in gravitational separation of the stratospheric air over Japan.

Ishidoya, S, S. Sugawara, S. Morimoto, S. Toyoda, H. Honda, S. Aoki, T. Nakazawa, D. Goto, Y. Inai, K. Ishijima, F. Hasebe

日本地球惑星科学連合大会
Stable Isotopes of CO2. An improved INSTAAR data set and a merged collaborative product

Sylvia Michel, Pieter Tans, John Miller, Chloe Brashear, John Ortega, Reid Clark, Bruce Vaughn, Heiko Moossen, Michael Rothe, Colin Allison, Ray Langenfelds, Elise-Andree Guerette, Ralph Keeling, Eric Morgan, Gordon Brailsford, Rowena Moss, Rahul Peethambaran, Hitoshi Mukai, Shohei Nomura, Yukio Terao, Lin Huang, Shinji Morimoto

51st Global Monitoring Annual Conference
Trend of N2O isotope ratios in the Arctic Atmosphere

Toyoda, S, D. Goto, S. Morimoto, M. Sasakawa, T. Machida, Y. Tohjima, D. Worthy, N. Yoshida

Seventh International Symposium on Arctic Research　2023/03/06
Global carbon budgets estimated from long-term observations of the atmospheric CO2 mole fraction, isotopic ratio of CO2 and O2/N2 at Ny-Alesund, Svalbard

Daisuke Goto, Shinji Morimoto, Shigeyuki Ishidoya, Shuji Aoki

Seventh International Symposium on Arctic Research　2023/03/06
Temporal Variations of the Mole Fraction, Carbon, and Hydrogen Isotope Ratios of Atmospheric Methane observed at Churchill, Canada

T. Ozaki, S. Morimoto, R. Fujita, T. Umezawa, D. Worthy, D. Goto

Seventh International Symposium on Arctic Research　2023/03/06
Atmospheric CH4 concentration during the Holocene reconstructed from the NEEM (Greenland) and Dome Fuji (East Antarctica) ice cores

I. Oyabu, K. Kawamura, K. Kitamura, S. Morimoto, S. Aoki, K. Goto-Azuma, T. Blunier

Seventh International Symposium on Arctic Research　2023/03/06
Revision of global fossil fuel methane emissions based on trends and meridional gradients of CH4 and 13CH4 during 1990-2020

N. Chandra, P.K.Patra, R. Fujita, T. Umezawa, D. Goto, S. Morimoto, Bruce H. Vaughn, T. Röckmann

Seventh International Symposium on Arctic Research　2023/03/06
カナダ・チャーチルにおける大気中メタン濃度とその炭素・水素同位体比の変動

尾崎智乙, 森本真司, 藤田遼, Doug Worthy, 梅澤拓, 後藤大輔

第27回大気化学討論会　2022/11/16
ハロカーボン類の測定から得られた新たな大気年代：成層圏大気サンプリング実験の結果

梅澤拓, 引地祥子, 森本真司, 斉藤拓也, 菅原敏

大気球シンポジウム　2022/11/08
南鳥島における大気中の二酸化炭素安定同位体比の長期観測

村山昌平, 坪井一寛, 石戸谷重之, 石島健太郎, 松枝秀和, 森本真司, 青木伸行, 吉田雅司, 雪田一弥, 藤原昴, 岩城昌志, 福田祐大, 松岡優輝, 潮延泰

日本気象学会秋季大会　2022/10/26
西太平洋域及び極域での大気中CH4濃度とその炭素・水素同位体比の変動

森本真司, 保田真人, 藤田遼, 梅澤拓, 青木周司

日本気象学会秋季大会　2022/10/26
An update of the results from IAEA CLASSIC experiment and the WMO round robins

Collin Allison, Ray Langenfelds, Elise-Andee Guerette, Sylvia Michel, Ralph Keeling, Shinji Morimoto, John Mund

GGMT-2022　2022/09/18
Chasing the WMO CO2 Compatibility Goal around the Southern Ocean

Stephens, B. B, Matthew Long, Kathryn McKain, Colm Sweeney, Ralph F. Keeling, Eric J. Morgan, Ann Staver, Zoe Loh, Paul Krummel, Ray Langenfelds, Casper Labuschagne, Warren Jouber, Shinji Morimoto, Daisuke Goto, Gordon Brailsford, Sylvia Nichol

GGMT-2022　2022/09/18
Laboratory comparison and progress on the development of community reference gases for carbon and hydrogen isotope ratios in the atmospheric CH4

Peter Sperlich, Gordon Brailsford, Rowena Moss, Tony Bromley, Sally Gray, Ross Martin, Sarah Bury, Julie Brown, Heiko Moossen, Michael Rothe, Heike Geilmann, Willi Brand, Sylvia Englund-Michel, Taku Umezawa, Thomas Röckmann, Dave Lowry, Jochen Schmi, Shinji Morimoto, Tim Arnold, Michael Dyonisius, Justin R. Clark

GGMT-2022　2022/09/18
Isotope (δ13C-CH4, δD-CH4) modelling of CH4 using MIROC4-ACTM

Naveen Chandra, Prabir K. Patra, Ryo Fujita, Taku Umezawa, Daisuke Goto, Shinji Morimoto, Thomas Röckmann

TRANSCOM-2022　2022/09/16
Variations of partial pressure of CO2 (pCO2) in the surface seawater and air-sea CO2 fluxes along 110°E in the Southern Ocean

Takayuki Matsuura, Shinji Morimoto, Gen Hashida, Tomomi Takamura, Shinichiro Nakaoka, Shuji Aoki

2022/05/29
Vertical profiles of halocarbons in the stratosphere over Japan in 2020 and implications for the “mean age” of the stratospheric air

Shoko Hikichi, Shinji Morimoto, Taku Umezawa, Takuya Saito, Sakae Toyoda, Satoshi Sugawara, Shigeyuki Ishidoya, Hideyuki Honda, Shuji Aoki

2022/05/29
Estimated regional CO2 flux and uncertainty based on an ensemble of atmospheric CO2 inversions

Naveen Chandra, Prabir K. Patra, Yousuke Niwa, Akihiko Ito, Yosuke Iida, Daisuke Goto, Shinji Morimoto, Masayuki Kondo, Masayuki Takigawa, Tomohiro Hajima, Michio Watanabe

2022/05/26
大気中の14CO2の変動

森本真司, 関根光, 山田千夏, 青木周司, 南雅代, 中村俊夫

第32回名古屋大学ISEE年代測定シンポジウム　2021/03/05
Observations of elemental and isotopic ratios of atmospheric major components and its application to detect atmospheric circulation and ocean heat uptake changes

Ishidoya, S, S. Sugawara, S. Morimoto, D. Goto, Y. Tohjima, K. Ishijima, D. Bellikov, F. Hasebe, K. Tsuboi, S. Murayama, N. Aoki, S. Aoki, T. Nakazawa

AGU fall meeting　2020/12/01
Studies on variations of atmospheric greenhouse gases in the ArCS project 2015-2019

Shinji Morimoto, Daisuke Goto, Shohei Murayama, Ryo Fujita, Yasunori Tohjima, Shigeyuki Ishidoya, Toshinobu Machida, Kazuhiro Tsuboi, Yoichi Inai, Prabir Patra, Shamil Maksyutov, Akihiko Ito, Shuji Aoki

The Eleventh Symposium on Polar Science　2020/12/01
Seasonal variations of 18O and 13C of CO2 in the upper troposphere and lower stratosphere over Siberia

Yoichi Inai, Shotaro Chida, Shinji Morimoto, Shohei Murayama, Shuji Aoki, Takakiyo Nakazawa, Toshinobu Machida, Hidekazu Matsueda, Yousuke Sawa, Kazuhiro Tsuboi, Keiichi Katsumata, Ryo Fujita

The Eleventh Symposium on Polar Science　2020/12/01
南鳥島において観測されたバックグランド大気の二酸化炭素安定同比体比の変動

村山昌平, 坪井一寛, 石島健太郎, 石戸谷重之, 松枝秀和, 森本真司, 佐藤幸隆, 幸田笹佳, 雪田一弥, 佐藤祥平, 池田諒, 洞口拓也

日本気象学会秋季大会　2020/10
Status report on O2 research activities from NIPR & TU

Goto, D, S. Morimoto

APO 2020 Virtual Workshop　2020/08/19
西太平洋における表層水のCO2分圧および大気海洋間CO2フラックスの変動

小成田航, 中岡慎一郎, 森本真司, 青木周司

日本地球惑星科学連合大会　2020/07/12
In-situ observation of atmospheric N2O and CO concentrations at Syowa Station, Antarctica by OA-ICOS laser spectrometer

Akai, S, S. Morimoto, L. Wei, D. Goto, S. Aoki

JpGU annual meeting　2020/07/12
Observation of carbon and hydrogen isotope ratios of atmospheric methane in the Arctic region : the dominant contribution of biogenic sources in the summer

Fujita, R, S. Morimoto, S. Ishidoya, Y. Tohjima, K. Ishijima, S. Aoki, T. Nakazawa

6th International Symposium on Arctic Research　2020/03/18
Validation of CH4 emissions from the East Siberian Arctic shelf based on atmospheric observation onboard R/V Mirai

Tohjima, Y, J. Zeng, Y. Niwa, T. Shirai, S. Ishidoya, S. Morimoto

ISAR-6 on line　2020/03/18
Air mass transport and trace gas distribution in the Siberian upper troposphere and lower stratosphere

Inai, Y, R. Fujita, T. Machida, H. Matsueda, Y. Sawa, K. Tsuboi, K. Katsumata, S. Morimoto, S. Aoki, T. Nakazawa

ISAR-6 on line　2020/03/18
飛騨高山冷温帯落葉広葉樹林における大気中温室効果気体濃度およびCO2安定同位体比の長期観測

村山昌平, 石戸谷重之, 近藤裕昭, 山本晋, 宇佐美哲之, 青木周司, 森本真司, 中澤高清, 村岡裕由

第4回流域圏保全研究推進セミナー　2020/03
In-situ continuous observations of atmospheric O2/N2 ratio and CO2 concentration on-board “SHIRASE” in the Southern Ocean

Takebayashi, S., S. Morimoto, D. Goto, G. Hashida, Y. Inai and S. Aoki

The Ninth Symposium on Polar Science　2018/12/04
CUBE/Biak: Observations of dynamics and chemistry affecting the air on its ascent in the tropical lower stratosphere

Hasebe, F, S. Aoki, S. Morimoto, I. Inai, T. Nakazawa, S. Sugawara, C. Ikeda, H. Honda, H. Yamazaki, Halimurrahman, N. Komala, F. A. Putri, A. Budiyono, M. Soedjarwo, S. Ishidoya, S. Toyoda, T. Shibata, M. Hayashi, N. Eguchi, N. Nishi, M. Fujiwara, S.-Y. Oginom, M. Shiotani, T. Sugidachi, D. A. Belikov, H. Nguyen-Thi

SPARC　2018/10/01
Seasonal characteristics of chemistry and dynamical transports into the extratropical upper troposphere/lowert stratosphere International-presentation

Inai, Y, R. Fujita, T. Machida, H. Matsueda, Y. Sawa, K. Tsuboi, K. Katsumata, S. Morimoto, S. Aoki, T. Nakazawa

SPARC　2018/10/01
Variations in atmospheric CO2 and its d13C and d18O observed at Minamitorishima Island in the western North Pacific International-presentation

Murayama, S, K. Tsuboi, S. Ishidoya, H. Matsueda, Y. Niwa, Y. Sawa, S. Takatsuji, K. Saito, K. Kozumi, H. Koda, S. Hosokawa, M. Nakanura, T. Usami, S. Morimoto

14th ICACGP/15th IGAC Science Conference　2018/09/25
Past variations of atmospheric methane and its isotope ratios reconstructed from firn air and ice core measurements International-presentation

Umezawa, T, S. Sugawara, K. Kawamura, T. Sugiyama, P.K. Patra, K. Ishijima, T. Saito, S. Morimoto, S. Aoki, T. Nakazawa

14th ICACGP/15th IGAC Science Conference　2018/09/25
Temporal variations of the atmospheric CO2 mole fraction, isotope ratio of CO2 and d(O2/N2) observed at Ny-Ålesund, Svalbard International-presentation

Goto, D, S. Morimoto, S. Aoki, S. Ishidoya, S. Takebayashi, C. Yamada, T. Nakazawa

14th ICACGP/15th IGAC Science Conference　2018/09/25
Variations of atmospheric CO2 and its isotopes in the upper troposphere/lower stratosphere over Siberia International-presentation

Inai, Y, S. Chida, S. Morimoto, S. Murayama, S. Aoki, T. Nakazawa, T. Machida, H. Matsueda, Y. Sawa, K. Tsuboi, K. Katsumata

14th ICACGP/15th IGAC Science Conference　2018/09/25
Seasonal characteristics of trace gas transport in the extratropical upper troposphere/lower stratosphere

Inai, Y, R. Fujita, T. Machida, H. Matsueda, Y. Sawa, K. Tsuboi, K. Katsumata, S. Morimoto, S. Aoki, T. Nakazawa

日本地球惑星科学連合大会　2018/05/20
Temporal variations of the global CH4 sources estimated by mole fraction, carbon and hydrogen isotope ratios of atmospheric CH4 and an atmospheric chemistry transport model International-presentation

Fujita, R, S. Maksyutov, S. Morimoto, S. Aoki, T. Nakazawa, H.-S. Kim, T. Umezawam, D. Goto, M. Sasakawa, T. Machida

日本地球惑星科学連合大会　2018/05/20
スバールバル諸島ニーオルスン基地における大気中二酸化炭素、メタン、一酸化炭素濃度の変動

村山昌平, 森本真司, 後藤大輔, 青木周司, 中澤高清, 石島健太郎, 前田高尚, 石戸谷重之, 菅原敏, 藤田遼

日本気象学会春季大会　2018/05/16
Terrestrial biospheric and oceanic CO2 uptake estimated from long-term measurements of atmospheric CO2 mole fraction, d13C and d(O2/N2) at Ny-_lesund, Svalbard International-presentation

Goto, D, S. Morimoto, S. Aoki, P. K. Patra, T. Nakazawa

5th International symposium on Arctic Research　2018/01/15
Temporal variations of the mole fraction, carbon and hydrogen isotope ratios of atmospheric methane in the Hudson Bay Lowlands, Canada International-presentation

Fujita, R, S. Morimoto, T. Umezawa, K. Ishijima, P.K. Patra, D.E.J.Worthy, D. Goto, S. Aoki, T. Nakazawa

5th International symposium on Arctic Research　2018/01/15
Vertical profiles and temporal variations of greenhouse gases in the stratosphere over Syowa Station, Antarctica International-presentation

Goto, D, S. Morimoto, S. Aoki, S. Sugawara, S. Ishidoya, Y. Inai, S. Toyoda, H. Honda, G. Hashida, T. Yamanouchi, T. Nakazawa

8th Symposium on Polar Science　2017/12/04
Observations of mole fractions and isotope ratios of the atmospheric greenhouse gases International-presentation Invited

Morimoto, S, D. Goto, R. Fujita, S. Aoki

8th Symposium on Polar Science　2017/12/04
Short-term variations in atmospheric potential oxygen at Ny-_lesund, Svalbard International-presentation

Goto, D, S. Morimoto, S. Aoki, P. K. Patra, T. Nakazawa

8th Symposium on Polar Science　2017/12/04
Seasonal and short-term variations in atmospheric potential oxygen at Ny-_lesund, Svalbard International-presentation

Goto, D, S. Morimoto, S. Aoki, P. K. Patra, T. Nakazawa

Svalbard Science Conference　2017/11/06
日本および南極上空における成層圏N2O isotopoculeの高度分布とその変動

豊田栄, 吉田尚弘, 森本真司, 稲飯洋一, 青木周司, 中澤高清, 菅原敏, 石戸谷重之, 後藤大輔, 本田秀之, 池田忠作, 石島健太郎

第23回大気化学討論会　2017/10/02
Japanese observation programs of atmospheric greenhouse gases in polar regions International-presentation

Goto, D, S. Morimoto, S. Aoki, T. Nakazawa, S. Ishidoya, S. Murayama, G. Hashida, T. Yamanouchi

9th WMO/IAEA Meeting on Carbon Dioxide, Other Greenhouse Gases, and Related Measurement Techniques　2017/08/28
Twenty-three year record of the mid-stratospheric 13CO2 over Japan International-presentation

Sugawara, S, S. Ishidoya, S. Morimoto, S. Aoki, T. Nakazawa, T. Umezawa, S. Toyoda, H. Honda

10th International Carbon Dioxide Conference　2017/08/21
Seasonal and interannual variations in the atmospheric Ar/N2 ratio observed by air monitoring networks of Japanese research institutes International-presentation

Ishidoya, S, Y. Tohjima, K. Tsuboi, D. Goto, S. Murayama, S. Morimoto, Y. Niwa, H. Matsueda

10th International Carbon Dioxide Conference　2017/08/21
Temporal variations of atmospheric O2 and CO2 at a coastal site in the northeastern part of the main island of Japan International-presentation

Goto, D, S. Morimoto, S. Aoki, T. Nakazawa

10th International Carbon Dioxide Conference　2017/08/21
Variations of atmospheric methane and its carbon and hydrogen isotopic ratios observed in the upper troposphere/lowermost stratosphere over the Eurasian Continent International-presentation

Fujita, R, S. Morimoto, Y. Inai, S. Aoki, T. Machida, Y. Sawa, H. Matsueda, Y. Niwa, K. Tsuboi, K. Katsumata, T. Umezawa, T. Nakazawa

10th International Carbon Dioxide Conference　2017/08/21
南極上空成層圏において観測された大気の重力分離と周辺域の気象場との関係

石戸谷重之, 菅原敏, 稲飯洋一, 森本真司, 本田秀之, 池田忠作, 冨川喜弘, 豊田栄, 青木周司, 中澤高清

日本気象学会春季大会　2017/05/25
Spatiotemporal variations in age and gravitational separation of the stratospheric air observed using a balloon-borne cryogenic air sampler

Ishidoya S, S. Sugawara, S. Aoki, S. Morimoto, T. Nakazawa, S. Toyoda, H. Honda, Y. Inai, C. Ikeda, F. Hasebe

日本地球惑星科学連合大会　2017/05/20
ユーラシア大陸上空の対流圏界面領域における大気中CH4の変動と炭素・水素同位体比に基づいたその解釈

藤田遼, 森本真司, 稲飯洋一, 青木周司, 町田敏暢, 澤庸介, 松枝秀和, 丹羽洋介, 坪井一寛, 勝又啓一, 梅澤拓, 中澤高清

日本地球惑星科学連合大会　2017/05/20
Distributions and temporal changes of greenhouse gases in upper atmosphere observed by aircraft

Machida T, S. Aoki, H. Matsueda, Y. Sawa, S. Isjhidota, T. Umezawa, S. Sugawara, D. Goto, Y. Niwa, K. Tsuboi, K. Katsumata, T. Nakazawa, S. Morimoto

日本地球惑星科学連合大会　2017/05/20
Variation in the mixing fraction of tropospheric and stratospheric air masses sharing the tropical lower stratosphere (TLS)

Inai Y, S. Sugawara, S. Aoki, S. Morimoto, T. Nakazawa

日本地球惑星科学連合大会　2017/05/20
Seasonal variations and trends of greenhouse gases in the upper troposphere/lowermost stratosphere by flask-based aircraft measurements between Europe and Japan

Sawa Y, T. Machida, H. Matsueda, Y. Niwa, K. Tsuboi, K. Katsumata, T. Umezawa, H. Eto, R. Fujita, D. Goto, S. Morimoto, S. Aoki

日本地球惑星科学連合大会　2017/05/20
Recent trend of atmospheric nitrous oxide isotopocules in the Northern Hemisphere

Toyoda, S, Y. Watanabe, T. Machida, Y. Tohjima, M. Sasakawa, S. Morimoto, D. Worthy, K. Ishijima, N. Yoshida

日本地球惑星科学連合大会　2017/05/20
Short-term variations of N2O and CO mixing ratios observed at suburb of Sendai from November to December 2016.

Inai, Y, W. Li, H. Nara, S. Morimoto, S. Aoki

日本地球惑星科学連合大会　2017/05/20
スバールバル諸島ニーオルスンにおけるメタン炭素同位体比の長期変化

森本真司, 青木周司, 藤田遼, 中澤高清, 山内恭

極域科学シンポジウム　2016/11/29
カナダ・チャーチルにおける炭素・水素同位体比の観測から推定された大気中CH4濃度変動にtaiする北方湿地の寄与

藤田遼, 森本真司, 梅澤拓, 石島健太郎, P.K. Patra, D.E.J. Worthy

極域科学シンポジウム　2016/11/29
極域科学シンポジウム

後藤大輔, 森本真司, 青木周司, 石戸谷重之, 橋田元, 中澤高清, 山内恭

極域科学シンポジウム　2016/11/29
Year-to-year variations of the atmospheric Ar/N2 and O2/N2 ratios observed in the northern mid-to-high latitudinal region for the period 2012-2016

Ishidoya, S, Y. Tohjima, D. Goto, S. Murayama, S. Morimoto

極域科学シンポジウム　2016/11/29
赤道上空成層圏におけるN2O 同位体比の鉛直分布

豊田栄, 吉田尚弘, 森本真司, 青木周司, 中澤高清, 菅原敏, 石戸谷重之, 植松光夫, 稲飯洋一, 長谷部文雄, 池田忠作, 本田秀之, 石島健太郎

大気球シンポジウム　2016/11/01
南極昭和基地における大気中の酸素・二酸化炭素濃度の変動

森本真司, 後藤大輔, P.K. Patra, 石戸谷重之, 青木周司, 中澤高清

日本気象学会秋季大会　2016/10/26
スバールバル諸島ニーオルスンにおける大気中CO2濃度および炭素同位体比の時間変動

後藤大輔, 森本真司, 石戸谷重之, 青木周司, 中澤高清, 弓場秋江

日本気象学会秋季大会　2016/10/26
On the use of aircraft CO2 observations for carbon cycle studies

Prabir K. Patra, T. Saeki, S. Morimoto, H. Matsueda, T. Machida, Y. Sawa, T. Umezawa, S. Aoki, T. Nakazawa

日本気象学会秋季大会　2016/10/25
西太平洋上における大気中メタン濃度とその炭素・水素同位体比の変動

藤田遼, 青木周司, 森本真司, 梅澤拓, S. Maksyutov, H-S. Kim, 中澤高清

第22回大気化学討論会　2016/10/12
Vertical distributions of N2O isotopocule in the equatorial stratosphere International-presentation

Toyoda, S, N. Yoshida, S. Morimoto, S. Aoki, T. Nakazawa, S. Sugawara, S. Ishidoya, Y. Inai, F. Hasebe, C. Ikeda, H. Honda, K. Ishijima

8th International Symposium on Isotopomers　2016/10/03
Source identification of atmospheric methane variations at Churchill, Canada using carbon and hydrogen isotope analyses International-presentation

Fujita, R, S. Morimoto, T. Umezawa, K. Ishijima, P.K. Patra, D.E.J. Worthy, D. Goto, S. Aoki, T. Nakazawa

IGAC　2016/09/26
日本上空の成層圏におけるN2Oアイソトポキュル比の高度分布

渡辺由羽馬, 豊田栄, 吉田尚弘, 島田智亮, 青木周司, 森本真司, 中澤高清, 菅原敏, 石戸谷重之, 本田秀之, 池田忠作, 井筒直樹, 吉田哲也

日本地球化学会　2016/09/14
北半球における対流圏N2Oアイソトポキュル比の経年変化

豊田栄, 渡辺由羽馬, 吉田尚弘, 町田敏暢, 遠嶋康徳, 石島健太郎, 森本真司, Doug Worthy

日本地球化学会　2016/09/14
Anthropogenic emissions of CO2 and CH4 from China are likely overestimated International-presentation

Patra, P.K, T. Saeki, S. Aoki, S. Morimoto, T. Nakazawa

AOGS　2016/07/31
Influence of Fossil Fuel Emissions on CO2 Flux Estimates by Atmospheric Inversions

T. Saeki, P. K. Patra, S. Morimoto, S. Aoki

日本地球惑星科学連合大会　2016/05/22
スバールバル諸島ニーオルスンにおける大気中CO2濃度及び炭素同位体比の時間変動

後藤大輔, 森本真司, 石戸谷重之, 青木周司, 中澤高清, 弓場秋江

日本地球惑星科学連合大会　2016/05/22
NICAM-TMデータ及び航空機観測データによるGOSAT/TANSO-FTS TIR CH4データの評価

野々垣亮介, 齋藤尚子, 今須良一, 塩見慶, 丹羽洋介, 青木周司, 森本真司, 町田敏暢, 松枝秀和, 澤庸介, 坪井一寛

日本地球惑星科学連合大会　2016/05/22
ユーラシア大陸上空の上部対流圏・下部成層圏における大気中CH4濃度とその炭素・水素同位体比の時空間変動

藤田遼, 森本真司, 青木周司, 町田敏暢, 澤庸介, 松枝秀和, 丹羽洋介, 坪井一寛, 中澤高清

日本地球惑星科学連合大会　2016/05/22
インドネシア上空成層圏において観測された大気主成分の拡散分離

石戸谷重之, 菅原敏, 青木周司, 森本真司, 中澤高清, 豊田栄, 池田忠作, 本田秀之, 稲飯洋一, 長谷部文雄, Putri Fanny, 後藤大輔, 村山昌平

日本地球惑星科学連合大会　2016/05/22
スバルバール諸島ニーオルスンにおける大気主成分濃度・同位体比の観測から示唆される下層大気の分子拡散分離

石戸谷重之, 後藤大輔, 森本真司, 青木周司, 村山昌平, 菅原敏, 中澤高清

日本地球惑星科学連合大会　2016/05/22
CO2 and SF6 concentrations in the stratosphere over Indonesia

S. Sugawara, S. Aoki, S. Morimoto, S. Ishidoya, T. Nakazawa, S. Toyoda, C. Ikeda, H. Honda, Y. Inai, F. Hasebe, F. Putri, D. Goto

日本地球惑星科学連合大会　2016/05/22
Regional methane (CH4) emission estimation based on observed atmospheric concentrations (2002-2012)

Patra, P. K, T. Saeki, E.J. Dlugokencky, K. Ishijima, T. Umezawa, A. Ito, S. Aoki, S. Morimoto, E.A. Kort, A. Crotwell, K. Ravi Kumar, T. Nakazawa

日本地球惑星科学連合大会　2016/05/22
飛騨高山森林サイトにおける大気中酸素濃度観測に基づく 2005-2015 年の全球炭素収支

石戸谷重之, 村山昌平, Prabir K. Patra, 田口彰一, 青木周司, 中澤高清, 森本真司, 後藤大輔, 近藤裕昭

日本気象学会春季大会　2016/05/18
Influence of fossil fuel emissions on CO2 flux estimated by atmospheric inversions

Saeki, T, P.K. Prabir, S. Morimoto, S. Aoki

日本気象学会春季大会　2016/05/18
What can atmospheric O2/N2 measurements tell us about variations in ocean biogeochemistry? International-presentation

Rödenbeck, C, G. Brailsford, N. Cassar, D. Goto, S. Morimoto, Y. Tohjima, M. Heimann, R. Keeling

EGU General Assembly　2016/04/17
モデル及び航空機によるGOSATのCH4鉛直データの評価

野々垣亮介, 齋藤尚子, 今須良一, 塩見慶, 丹羽洋介, 青木周司, 森本真司, 町田敏暢, 松枝秀和, 澤庸介, 坪井一寛

生研フォーラム　2016/03/17
スヴァールバル諸島ニーオルスンにおける酸素・窒素比及び大気ポテンシャル酸素の高精度連続観測

後藤大輔, 森本真司, 青木周司, Prabir K.Patra, 中澤高清

GRENE成果報告会　2016/03/03
Modelling of greenhouse gases and related species in the Arctic environment

P. K. Patra, T. Saeki, K. Ishijima, K. Ravi Kumar, S. Taguchi, D. Belikov, S. Makyutov, Y. Niwa, T. Maki, D. Goto, Y. Tohjima, S. Ishidoya, S. Morimoto, S. Aoki, K. Takata

GRENE成果報告会　2016/03/03
スバールバル諸島ニーオルスン及びカナダ・チャーチルにおける大気中の温室効果気体及び関連気体の変動

森本真司, 後藤大輔, 村山昌平, 石戸谷重之, 藤田量, 石島健太郎, P.K.Patra, 青木周司

GRENE成果報告会　2016/03/03
北極域上空における温室効果気体の変動

町田敏暢, 澤庸介, 松枝秀和, 丹羽洋介, 坪井一寛, 勝又啓一, 笹川基樹, 村山昌平, 森本真司, 豊田栄, 青木周司

GRENE成果報告会　2016/03/03
Analysis of atmospheric methane from Siberian tower observation using chemistry transport model

K. Ishijima, M. Sasakawa, T. Machida, P. K. Patra, A. Ito, K. Ravi Kumar, T. Saeki, S. Morimoto, S. Aoki, T. Nakazawa

GRENE成果報告会　2016/03/03
北極域における大気中N2O isotopoculeの時空間分布

豊田栄, 渡辺由羽馬, 町田敏暢, 遠嶋康徳, 森本真司, Doug Worthy, 石島健太郎, 吉田尚弘

GRENE成果報告会　2016/03/03
北極域における大気ポテンシャル酸素と大気海洋間酸素フラックスの船舶観測

石戸谷重之, 内田裕, 笹野大輔, 小杉如央, 田口彰一, 亀山宗彦, 石井雅男, 森本真司, 遠嶋康徳, 西野茂人, 村山昌平, 青木周司, 石島健太郎, 藤田量, 後藤大輔, 中澤高清

GRENE成果報告会　2016/03/03
Development of an atmospheric N2O isotopocule model and optimization procedure International-presentation

Ishijima, K, M. Takigawa, K. Sudo, S. Toyoda, N. Yoshida, T. Rockmann, J. Kaiser, S. Aoki, S. Morimoto, S. Sugawara, T. Nakazawa

AGU Fall Meeting 2015　2015/12/14
過去250年間の大気中メタンの同位体比変動の復元：フィルン空気・アイスコア測定とフィルン空気輸送モデルの適用

梅澤拓, 菅原敏, 川村賢二, 杉山貴規, 森本真司, 青木周司, 中澤高清

極域科学シンポジウム　2015/11/16
北極域における大気中の一酸化二窒素とその同位体の時空間分布

豊田栄, 町田敏暢, 遠嶋康徳, 森本真司, Doug Worthy, 石島健太郎, 吉田尚弘

極域科学シンポジウム　2015/11/16
インドネシアにおける成層圏大気サンプリング気球実験の結果

青木周司, 森本真司, 中澤高清, 長谷部文雄, 稲飯洋一, 菅原敏, 石戸谷重之, 豊田栄, 本田秀之, 池田忠作, 飯嶋一征, 田村誠, 井筒直樹, 吉田哲也, 後藤大輔, 林政彦, Fanny A. Putri, Ninong Komala, Moeji Soedjarwo

大気球シンポジウム　2015/11/16
平成２７年度成層圏大気クライオサンプリング実験（結果速報）

青木周司, 森本真司, 中澤高清, 菅原敏, 石戸谷重之, 豊田栄, 本田秀之, 池田忠作, 井筒直樹, 吉田哲也

大気球シンポジウム　2015/11/16
インドネシア・Biak島での大気観測気球実験実施報告

青木周司, 森本真司, 中澤高清, 長谷部文雄, 稲飯洋一, 菅原敏, 石戸谷重之, 豊田栄, 本田秀之, 池田忠作, 飯嶋一征, 田村誠, 井筒直樹, 吉田哲也, 後藤大輔, 林政彦, Halimurrahman Mukri, Moeji Soedjarwo, Ir. Agus Hidayat, Afif budiyono

大気球シンポジウム　2015/11/16
放出源別モデル計算を用いたメタンフラックスの最適化について

石島健太郎, Prabir Patra, Dlugokencky, 伊藤昭彦, 町田敏暢, 梅澤拓, 青木周司, 森本真司, 中澤高

日本気象学会秋季大会　2015/10/28
対流圏大気中一酸化二窒素の同位体分子種（isotopocule）の長期観測

豊田栄, 町田敏暢, 遠嶋康徳, 森本真司, Doug Worthy, 石島健太郎, 吉田尚弘

日本気象学会秋季大会　2015/10/28
インドネシア上空成層圏の温室効果気体と重力分離の観測

菅原敏, 石戸谷重之, 青木周司, 森本真司, 中澤高清, 豊田栄, 池田忠作, 本田秀之, 稲飯洋一, 長谷部文雄, Fanny A. Putri, 後藤大輔

日本気象学会秋季大会　2015/10/28
気候変動と炭素循環の包括的評価を目指した大気中アルゴン濃度と酸素濃度の高精度観測

石戸谷重之, 村山昌平, 遠嶋康徳, 坪井一寛, 後藤大輔, 田口彰一, 松枝秀和, 森本真司, 菅原敏

日本気象学会秋季大会　2015/10/28
温室効果ガス観測に関する相互比較実験 (iceGGO)の結果

川崎照夫, 中澤高清, 青木周司, 森本真司, 後藤大輔, 町田敏暢, 遠嶋康徳, 向井人史, 勝又啓一, 村山昌平, 石戸谷重之, 加藤健次, 下坂琢哉, 青木伸行, 渡辺拓朗, 小出寛, 高橋正臣, 滝沢厚詩, 藤谷徳之助, 松枝秀和, 澤庸介, 坪井一寛

日本気象学会秋季大会　2015/10/28
GOSAT/TANSO-FTS TIR、NICAM-TM、航空機のメタンデータの比較検証解析

野々垣亮介, 齋藤尚子, 今須良一, 塩見慶, 丹羽洋介, 青木周司, 森本真司, 町田敏暢, 松枝秀和, 澤庸介, 坪井一寛

第21回大気化学討論会　2015/10/19
赤道上空成層圏におけるN2O isotopocule比の高度分布

豊田栄, 吉田尚弘, 森本真司, 青木周司, 中澤高清, 菅原敏, 石戸谷重之, 稲飯洋一, 長谷部文雄, 池田忠作, 本田秀之, 石島健太郎

第21回大気化学討論会　2015/10/19
カナダ・チャーチルにおける大気中CH4濃度の季節変動とその起源解析

藤田遼¬, 森本真司, 石島健太郎, Prabir Patra, 梅澤拓, Doug Worthy, 青木周司, 中澤高清

第21回大気化学討論会　2015/10/19
放出源別モデル計算による全球メタンフラックス最適化

石島健太郎, Prabir Patra, Dlugokencky, 伊藤昭彦, 町田敏暢, 遠嶋康徳, 梅澤拓, 青木周司, 森本真司, 中澤高清

第21回大気化学討論会　2015/10/19
Methane isotope measurements of CARIBIC air samples and preliminary intercomparison results International-presentation

Umezawa,T, C.A.M. Brenninkmeijer, T. Roeckmann, S.C.Tyler, S. Aoki, S. Morimoto

InGOS International Conference　2015/09/21
The “GOLLUM” O2 intercomparison programme: Latest results and next steps International-presentation

Manning, A. C, R. F. Keeling, A. J. Etchells, M. Hewitt, M. L. Bender, K. Bracchi, G. W. Brailsford, W. A. Brand, N. Cassar, A. C. Cox, M. Leuenberger, H. A. J. Meijer, S. Morimoto, T. Nakazawa, R. E. M. Neubert, W. J. Paplawsky, J. M. Richter, B. B. Stephens, Y. Tohjima, S. van, der Laan, I. T, van der Laan‐Luijkx, A. Watt, P. A. Wilson

the APO Workshop　2015/09/18
Continuous measurements of APO at Ny-Ålesund, Svalbard International-presentation

Goto, D, S. Morimoto, S. Aoki, T. Nakazawa, P. K. Patra

the APO Workshop　2015/09/18
Temporal variations of δ(O2/N2) and Atmospheric Potential Oxygen (APO) observed at Syowa Station, Antarctica International-presentation

Morimoto, S, D. Goto, S. Ishidoya, P. K. Patra, S. Aoki, T. Nakazawa

the APO Workshop　2015/09/18
Comparisons of CO2 and other greenhouse gases sampled by three different methods in the CONTRAIL project International-presentation

Sawa, Y, T. Machida, H. Matsueda, Y. Niwa, K. Tsuboi, K. Katsumata, T. Umezawa, H. Eto, S. Morimoto, S. Aoki

Carbon Dioxide, Other Greenhouse Gases and Related Measurement Techniques, 18th WMO/IAEA Meeting　2015/09/13
Inter-comparison experiments of standard gases for JMA/WCC activity International-presentation

Kawasaki, T, A. Takizawa, M. Takahashi, H. Koide, T. Nakazaw, S. Aoki, S. Morimoto, K. Kato, T. Shimosaka, N. Aoki, T. Watanabe, T. Machida, Y. Tohjima, H. Mukai, K. Katsumata, T. Fujitani, S. Murayama, S. Ishidoya, D. Goto, H. Matsueda, Y. Sawa, K. Tsuboi

Carbon Dioxide, Other Greenhouse Gases and Related Measurement Techniques, 18th WMO/IAEA Meeting　2015/09/13
カナダ・チャーチルにおける大気中メタン濃度とその炭素・水素同位体比の変動

藤田遼, 森本真司, 梅澤拓, Doug Worthy, 青木周司, 中澤高清

日本地球惑星科学連合大会　2015/05/24

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本学学生
酸素同位体観測により推定された飛騨高山冷温帯落葉広葉樹林サイトにおける夜間の生態系呼吸に対する土壌呼吸の割合の季節変動

村山昌平, 沢田-高村近子, 三枝信子, 石戸谷重之, 渡辺力, 伊藤昭彦, 森本真司, 近藤裕昭, 前田高尚, 村岡裕由, 宇佐美哲之, 青木周司, 中澤高清

日本地球惑星科学連合大会　2015/05/24

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その他
気の重力分離の観測に基づく成層圏大気循環の研究とその今後の展望

石戸谷重之, 菅原敏, 森本真司, 青木周司, 中澤高清, 本田秀之, 豊田栄, 稲飯洋一, 橋田元, 山内恭, 植松光夫, 長谷部文雄, 後藤大輔, 村山昌平

日本気象学会春季大会　2015/05/20

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その他
クロック・トレーサーを用いたAOA推定の課題

菅原敏, 青木周司, 森本真司, 中澤高清, 石戸谷重之, 豊田栄, 本田秀之

日本気象学会春季大会　2015/05/20

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その他
Continuous measurements of the atmospheric O2/N2 ratio at Ny-Ålesund, Svalbard International-presentation

Goto,D, S. Morimoto, S. Aoki, T. Nakazawa, P.K. Patra

ISAR-4　2015/04/27

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その他
Inverse and forward modelling of CH4 using ACTM International-presentation

Patra, P. K, T. Saeki, K. Ishijima, G. Monteil, E. J. Dlugokencky, S. Aoki, S. Morimoto, T. Nakazawa, T. Umezawa, Y. Fukuyama, R. Detmers, O. Hasekamp, A. Butz, E. A. Kort, S. C. Wofsy

European Geosciences Union | General Assembly 2015　2015/04/12

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その他
スバールバル諸島ニーオルスンにおける大気中二酸化炭素、メタン、一酸化炭素の連続観測

村山昌平, 森本真司, 後藤大輔, 青木周司, 中澤高清, 松枝秀和, 坪井一寛, 石島健太郎, 藤田遼, 石戸谷重之, 宇佐美哲之

極域科学シンポジウム　2014/12/05

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その他
Atmospheric N2O isotope simulation: Model optimization, comparison with observation and source implication International-presentation

Ishijima, K, S. Toyoda, M. Takigawa, K. Sudo, T. Nakazawa, S. Aoki, S. Morimoto, S. Sugawara, T. Rockmann, J. Kaiser, N. Yoshida

NCGG7　2014/11/05

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その他
カナダ・チャーチルにおける大気中メタン濃度とその炭素・水素同位体比の変動

藤田燎, 森本真司, 梅澤拓, D. Worthy, 青木周司, 中澤高清

第20回大気化学討論会　2014/10/27

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本学学生
オールジャパン体制による温室効果ガス観測標準の相互比較実験 (iceGGO計画

松枝秀和, 中澤高清, 青木周司, 森本真司, 後藤大輔, 町田敏暢, 遠嶋康徳, 向井人史, 勝又啓一, 村山昌平, 石戸谷重之, 加藤健次, 下坂琢哉, 青木伸行, 小出寛, 高橋正臣, 滝沢厚詩, 藤谷徳之助, 坪井一寛, 澤庸介

第20回大気化学討論会　2014/10/27

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その他
酸素安定同位体比観測により推定された飛騨高山サイトにおける夜間の生態系呼吸に対する土壌呼吸の割合の季節的変動

村山昌平, 高村近子, 渡辺力, 三枝信子, 森本真司, 石戸谷重之, 近藤裕昭, 中澤高清, 青木周司, 宇佐美哲之

日本気象学会秋季大会　2014/10/21

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その他
スバールバル諸島ニーオルスンにおける大気中二酸化炭素、メタン、一酸化炭素の連続観測

村山昌平, 森本真司, 後藤大輔, 青木周司, 中澤高清, 松枝秀和, 坪井一寛, 石島健太郎, 藤田遼, 石戸谷重之, 宇佐美哲之

日本気象学会春季大会　2014/05/21

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その他
Seasonal changes of CO2, CH4, N2O and SF6 in the upper troposphere/lower stratosphere over the Eurasian continent observed by commercial airliner International-presentation

Y. Sawa, T. Machida, H. Matsueda, Y. Niwa, K. Tsuboi, S. Murayama, S. Morimoto, S. Aoki

MOZAIC - IAGOS Scientific Symposium on Atmospheric Observation by Commercial Aircraft　2014/05/12

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その他
Seasonal change of CO2, CH4, N2O and SF6 in the upper troposphere/lower storatosphere over the Eurasian continent observed by commercial airliner

Y. Sawa, T. Machida, H. Matsueda, Y. Niwa, K. Tsuboi, S. Murayama, S. Morimoto, S. Aoki

日本地球惑星科学連合大会　2014/04/28

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その他
Variations of tropospheric methane over Japan during 1988–2010

T. Umezawa, D. Goto, S. Aoki, K. Ishijima, P.K. Patra, S. Sugawara, S. Morimoto, T. Nakazawa

日本地球惑星科学連合大会　2014/04/28

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その他
Long-term changes of CH4 concentration and its carbon isotopic ratio in the lower stratosphere over Japan

S. Sugawara, S. Morimoto, T. Umezawa, S. Aoki, T. Nakazawa, S. Ishidoya, S. Toyoda, H. Honda

日本地球惑星科学連合大会　2014/04/28

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その他
Continuous measurements of the atmospheric O2/N2 ratio initiated at Ny-Alesund, Svalbard

D. Goto, S. Morimoto, S. Aoki, T. Nakazawa, S. Murayama

日本地球惑星科学連合大会　2014/04/28

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その他
Variations of atmospheric CH4, N2O and SF6 over Japan and the East China Sea International-presentation

Ishijima, K, D. Goto, S. Ishidoya, H. Yashiro, T. Umezawa, S. Sugawara, P. K. Patra, A. Muromachi, J. W. Elkins, E. Dlugokencky, S. Morimoto, S. Aoki, T. Nakazawa

AGU Fall meeting　2013/12/09
Vertical CO2 gradient as an indicator of stratospheric circulation International-presentation

Sugawara, S, S. Aoki, S. Morimoto, T. Nakazawa, S. Ishidoya, S. Toyoda, H. Honda

AGU Fall meeting　2013/12/09
南極・昭和基地での成層圏大気採取実験—第54次観測隊実験報告—

森本真司, 稲飯洋一, 青木周司, 菅原敏, 石戸谷重之, 豊田栄, 本田秀之, 菊池雅行, 山内恭, 中澤高清, 飯嶋一征, 井筒直樹, 吉田哲也

日本気象学会秋季大会　2013/11/19
大気観測に基づく地球規模炭素循環の研究

森本真司

日本気象学会秋季大会　2013/11/19
大気の重力分離シミュレーション

菅原敏, 石戸谷重之, 森本真司, 青木周司, 中澤高清, 本田秀之, 村山昌平

日本気象学会秋季大会　2013/11/19
航空機を用いた大気主成分濃度・同位体比の高精度観測と今後の展開

戸谷重之, 青木周司, 森本真司, 坪井一寛, 松枝秀和, 菅原敏, 中澤高清, 村山昌平, 後藤大輔, 澤庸介, 丹羽洋介, 田口彰一, Prabir Patra, 町田敏暢, 山内恭

日本気象学会秋季大会　2013/11/19
大気中酸素濃度観測に基づく全球炭素循環の研究

後藤大輔, 石戸谷重之, 森本真司, 青木周司, 中澤高清

日本気象学会秋季大会　2013/11/19
熱帯対流圏界層における力学・化学過程の総合的研究

長谷部文雄, 青木周司, 本田秀之, 菅原敏, 森本真司, 豊田栄, 石戸谷重之, 後藤大輔, 中澤高清, 柴田隆, 林政彦, 西憲敬, 藤原正智, 宮崎和幸, 塩谷雅人

大気球シンポジウム　2013/11/14
白鳳丸実験で得られた赤道域CO2濃度と上部対流圏CO2濃度の比較

稲飯洋一, 青木周司, 本田秀之, 菅原敏, 森本真司, 石戸谷重之, 町田敏暢, 松枝秀和, 澤庸介, 塩谷雅人, 植松光男, 古屋浩志, 飯嶋一征, 荘司康弘, 松坂幸彦, 井筒直樹, 吉田哲也

大気球シンポジウム　2013/11/14
昭和基地における成層圏大気採取実験—54次実験報告

森本真司, 稲飯洋一, 青木周司, 菅原敏, 石戸谷重之, 豊田栄, 本田秀之, 菊池雅行, 山内恭, 中澤高清, 飯嶋一征, 井筒直樹, 吉田哲也

大気球シンポジウム　2013/11/14
平成26年度成層圏大気クライオサンプリング実験計画

青木周司, 本田秀之, 豊田栄, 菅原敏, 森本真司, 石戸谷重之, 後藤大輔, 中村俊夫, 中澤高清

大気球シンポジウム　2013/11/14
みらい」MR12-E03北極航海において観測された大気ポテンシャル酸素の変動

石戸谷重之, 笹野大輔, 内田裕, 田口彰一, 遠嶋康徳, 松下隼士, 石井雅男, 小杉如央, 石島健太郎, 森本真司, 西野茂人, 村山昌平, 後藤大輔, 中澤高清, 青木周司

第4回極域科学シンポジウム　2013/11/14
南極成層圏大気の直接採取による温室効果気体の観測—第54次隊実験報告

森本真司, 稲飯洋一, 青木周司, 菅原敏, 石戸谷重之, 豊田栄, 本田秀之, 菊池雅行, 山内恭, 中澤高清, 飯嶋一征, 井筒直樹, 吉田哲也

第4回極域科学シンポジウム　2013/11/14
スバールバル諸島ニーオルスンにおける大気中メタン濃度と同位体比の変動

森本真司, 梅澤拓, 青木周司, 中澤高清

第19回大気化学討論会　2013/11/06
成層圏におけるN2Oアイソトポマー比の緯度・高度分布

豊田栄, 森本真司, 稲飯洋一, 青木周司, 本田秀之, 菅原敏, 石戸谷重之, 中澤高清, 吉田尚弘

第19回大気化学討論会　2013/11/06
ドームふじ深層氷床コアから復元した大気二酸化炭素の濃度と炭素同位体比の氷期・間氷期変動

青木周司, 藤井道太郎, 松本康志, 仲田久和, 中澤高清, 森本真司, 川村賢二, 本山秀明, 藤井理行

第19回大気化学討論会　2013/11/06
日本・東シナ海域におけるCH4、N2O、SF6濃度の変動

石島健太郎, 後藤大輔, 石戸谷重之, 八代尚, 梅澤拓, 菅原敏, Prabir K. Patra, 室町篤, d Dlugockenky, 森本真司, 青木周司, 中澤高清

第19回大気化学討論会　2013/11/06
O2:CO2 Exchange Ratios Observed at TKY Site and its Implication to the Forest Carbon Cycle International-presentation

Ishidoya, S, S. Murayama, C. Takamura, H. Kondo, N. Saigusa, D. Goto, S. Morimoto, N. Aoki, S. Aoki, T. Nakazawa

Workshop on the Carbon Budget and Forest Ecosystem in the Asian Monitoring Network　2013/10/24
Oceanic and terrestrial biospheric CO2 uptake estimated from atmospheric potential oxygen observed at Ny-Alesund, Svalbard and Syowa, Antarctica International-presentation

Ishidoya, S, S. Morimoto, S. Aoki, S. Taguchi, D. Goto, S. Murayama, T. Nakazawa

3rd International Symposium on Arctic Research　2013/01/11
Gravitational separation in the stratosphere – A new tracer of atmospheric circulation International-presentation

Ishidoya, S, S. Sugawara, S. Morimoto, S. Aoki, T. Nakazawa, H. Honda, S. Murayma

AGU fall meeting　2012/12/03
Numerical simulation of the gravitational separation in the stratosphere International-presentation

Sugawara, S, Ishidoya, S, S. Morimoto, S. Aoki, T. Nakazawa, H. Honda, S. Murayama

AGU fall meeting　2012/12/03
白鳳丸による東部太平洋赤道上での温室効果気体の総合観測

青木周司, 稲飯洋一, 中澤高清, 本田秀之, 飯嶋一征, 荘司泰弘, 松坂幸彦, 井筒直樹, 吉田哲也, 森本真司, 菅原敏, 豊田栄, 古谷浩志, 植松光夫, 松見豊, 長谷部文雄

第18回大気化学討論会　2012/11/06
白鳳丸による東部太平洋赤道上での気球を用いた総合観測

青木周司, 本田秀之, 稲飯洋一, 飯嶋一征, 荘司泰弘, 松坂幸彦, 井筒直樹, 吉田哲也, 森本真司, 菅原敏, 豊田栄, 古谷浩志, 植松光夫, 中澤高清

平成24年度大気球シンポジウム　2012/10/16
白鳳丸における気球オペレーション

本田秀之, 青木周司, 稲飯洋一, 森本真司, 菅原敏, 豊田栄, 中澤高清, 植松光夫, 古谷浩志, 飯嶋一征, 荘司泰弘, 松坂幸彦, 井筒直樹, 吉田哲也

平成24年度大気球シンポジウム　2012/10/16
白鳳丸船上気球実験により観測された赤道上空成層圏の微量成分と平均年代の推定

菅原敏, 青木周司, 本田秀之, 稲飯洋一, 森本真司, 豊田栄, 石戸谷重之, 中澤高清, 植松光夫, 古谷浩志, 飯嶋一征, 荘司泰弘, 松坂幸彦, 井筒直樹, 吉田哲也

平成24年度大気球シンポジウム　2012/10/16
白鳳丸船上気球実験により観測された赤道上空成層圏大気主成分の重力分離

石戸谷重之, 青木周司, 森本真司, 菅原敏, 稲飯洋一, 本田秀之, 中澤高清, 村山昌平, 植松光夫, 古谷浩志, 飯嶋一征, 荘司泰弘, 松坂幸彦, 井筒直樹, 吉田哲也

平成24年度大気球シンポジウム　2012/10/16
平成25 年度成層圏大気クライオサンプリング実験計画

青木周司, 本田秀之, 豊田栄, 菅原敏, 森本真司, 石戸谷重之, 吉田尚弘, 中村俊夫, 稲飯洋一, 中澤高清

平成24年度大気球シンポジウム　2012/10/16
白鳳丸による東部太平洋赤道上での大気微量成分の総合観測

青木周司, 稲飯洋一, 中澤高清, 本田秀之, 飯嶋一征, 松坂幸彦, 吉田哲也, 森本真司, 菅原敏, 豊田栄, 古谷浩志, 植松光夫, 松見豊, 長谷部文雄

日本気象学会秋季大会　2012/10/03
気球搭載型小型 J-T サンプラーを用いた成層圏大気主成分重力分離の観測

石戸谷重之, 青木周司, 森本真司, 菅原敏, 稲飯洋一, 本田秀之, 中澤高清, 村山昌平, 植松光夫

日本気象学会秋季大会　2012/10/03
フラックス観測、酸素安定同位体観測及び群落微気候モデルにより推定された飛騨高山サイトにおける各呼吸要素の季節的変動

村山昌平, 渡辺力, 高村近子, 三枝信子, 森本真司, 石戸谷重之, 近藤裕昭, 中澤高清, 青木周司, 宇佐美哲之

日本気象学会秋季大会　2012/10/03
白鳳丸熱帯東部太平洋気球観測による大気の age の推定

稲飯洋一, 青木周司, 本田秀之, 菅原敏, 森本真司, 長谷部文雄, 植松光夫

日本気象学会秋季大会　2012/10/03
Balloon Launch and Flight Operation from Research Vessel "Hakuho-Maru" for Stratospheric Air Sampling over the Equator of Eastern Pacific International-presentation

Shuji Aoki, Hideyuki Fuke, Hideyuki Honda, Issei Iijima, Yoichi Inai, Naoki Izutsu, Yukihiko Matsuzaka, Shinji Morimoto, Yoshitaka Saito, Yoichi Kato, Yuya Kakehashi, Takatoshi Sato, Yasuhiro Shoji, Keisuke Tamura, Tetsuya Yoshida, Balloon Launch, Flight Operation, from Research Vessel, Hakuho-Maru" for Stratospheric Air Sampling over, the Equator of, Eastern Pacific

39th COSPAR Scientific Assembly　2012/07/14
大気中酸素濃度観測に基づく森林生態系の総一次生産と生態系呼吸の分離評価

石戸谷重之, 村山昌平, 高村近子, 近藤裕昭, 三枝信子, 後藤大輔, 森本真司, 青木周司, 中澤高清, 宇佐美哲之

日本気象学会春季大会　2012/05/26
成層圏大気主成分の重力分離とその物質循環研究への応用の可能性

石戸谷重之, 菅原敏, 森本真司, 青木周司, 中澤高清, 本田秀之, 村山昌平, 成層圏大気主成分の重力分離とその物質循環研究への応用の可能性

日本気象学会春季大会　2012/05/26
仙台市郊外および三陸沖江島における大気中O2/N2比の連続観測

後藤大輔, 森本真司, 青木周司, 中澤高清

日本地球惑星科学連合大会2012年大会　2012/05/20
Svalbard 諸島 Ny-Ålesund および南極昭和基地において観測された大気ポテンシャル酸素から推定された陸上生物圏および海洋の CO2 吸収量の年々変動

石戸谷重之, 森本真司, 青木周司, 田口彰一, 後藤大輔, 中澤高清

日本地球惑星科学連合大会2012年大会　2012/05/20
成層圏大気主成分の重力分離とその物質循環研究への応用の可能性

石戸谷重之, 菅原敏, 森本真司, 青木周司, 中澤高清, 本田秀之, 村山昌平

日本地球惑星科学連合大会2012年大会　2012/05/20

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Research Projects 39

大気中メタン濃度と同位体比の広域観測によるメタン濃度変動原因に関する研究

森本真司

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 基盤研究(B)

Institution: 東北大学

2024/04/01 - 2028/03/31
多成分気体分析に基づく成層圏物質循環の長期変動の評価

菅原敏, 梅澤拓, 後藤大輔, 森本真司, 豊田栄, 石戸谷重之, 丹羽洋介, 石島健太郎

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 基盤研究(A)

Institution: 宮城教育大学

2023/04/01 - 2028/03/31
Evaluation of climate change and carbon/oxygen cycles based on innovative observations of atmospheric constituents

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (S)

Institution: National Institute of Advanced Industrial Science and Technology

2022/04/27 - 2027/03/31
過去30年間で成層圏の大気循環は変化したか？：ハロカーボンの新規測定にもとづく推定

梅澤拓, 森本真司, 菅原敏

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 基盤研究(C)

Institution: 国立研究開発法人国立環境研究所

2023/04/01 - 2026/03/31
Arctic Challenge for Sustainability phase II (ArCS-II)

Shinji Morimoto, Prabir K. Patra, Masayuki Takigawa, Naveen Chandra

Offer Organization: Ministry of Education, Culture, Sports, Science and Technology (MEXT)

Institution: Japan Agency for Marine-Earth Science and Technology (JAMSTEC)

2019/09 - 2025/03
両極の氷床コアと全球気候植生モデルによる過去1万年のメタン濃度の変動要因の解明

大藪幾美, 川村賢二, 青木周司, 森本真司, 阿部彩子, 吉森正和, 大石龍太

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 基盤研究(B)

Institution: 国立極地研究所

2020/04/01 - 2024/03/31

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2020年度はグリーンランドのNEEM氷床コアから、過去1万年間のメタン濃度のほか、合計8成分（CH4濃度, N2O濃度, CO2濃度, δ15N-N2, δ18O-O2, O2/N2, Ar/N2, 空気含有量）の大気組成データの取得を進めた。グリーランドの氷床コアに共通して、完新世の多くの期間に相当する深度帯は、割れやクラックが多く氷の質が悪いという特徴がある（ブリットルゾーンと呼ばれる）。微小なクラックに現在大気が混入したりすることで汚染が発生しやすく、先行研究においてブリットルゾーンではメタン濃度を高精度で分析することが難しいという問題点があった。本研究で用いたNEEM氷床コアも600 -1300m深（約2500-10000万年前）がブリットルゾーンに該当し、氷の質が極めて悪い試料が散見されたが、セラミックナイフを用いて丁寧にクラックを除去したり、真空引き時間を海外の研究機関の6倍の長さにするなどの工夫を凝らすことで、ブリットルゾーンにおいても汚染の影響を低減した質の高いメタン濃度の測定に成功した。ガスクロマトグラフによる分析については、試料容器交換時にわずかに混入する大気を完全に排除するための真空排気装置を新たに設置し、試料導入箇所の真空度を高めた。これらの工夫により、メタン濃度を3ppb（1σ）という高精度で安定して取得することに成功した。また、東北大学において、国立極地研究所で使用しているガスクロマトグラフ用標準ガス（CH4, N2O, CO2）の濃度を東北大学の温室効果ガス測定装置で分析し、標準ガス濃度スケールの相互検定を実施した。
同位体比を用いた大気中メタンの全球的変動原因の解明

森本真司, 青木周司, 後藤大輔

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 基盤研究(B)

Institution: 東北大学

2020/04/01 - 2024/03/31

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大気中のメタン（CH4)は、二酸化炭素に次いで重要な温室効果気体であることからその動態が注目されており、より確実なCH4濃度の将来予測を行うためにその変動メカニズムの解明が急務である。しかしながら、CH4の生成消滅過程が非常に複雑であること、大気中CH4濃度の観測や地上からのCH4フラックス観測からは、大気中バックグランドCH4濃度の変動原因に関する情報を得ることが困難であり、CH4濃度の変動原因について十分な理解が得られているとは言えない。本研究では、北半球高緯度域・北極域、南極昭和基地、そして北太平洋・西太平洋域における系統的なCH4濃度観測と、CH4放出源に関する情報を持つCH4の炭素・水素同位体比の高精度観測を維持・強化し、全球でのCH4濃度・同位体比の変動を明らかにする。さらに広域で観測されたCH4濃度・同位体比のトレンド解析と大気モデルを用いたCH4収支解析を行い、大気中CH4濃度の変動に寄与した放出源変動に関する知見を得ることを目的とする。本年度は、国立極地研究所に設置されているCH4炭素同位体比分析システムの整備と自動化を行い、多連自動インレットと液体窒素自動補給、酸化炉の自動再生を導入することにより、一日に従来の2.5倍の大気サンプルを分析可能にした。さらに東北大学のCH4水素同位体比分析システムについても分析シーケンスの最適化とシステムの改修により、一日の分析可能数を2倍にした。北太平洋・西太平洋域、南極昭和基地、そして北半球高緯度域で定期的に採取されている大気試料を分析し、CH4濃度および同位体比の全球分布とその時間変化を明らかにしている。海外機関とのCH4同位体比スケールの比較実験に参加し、我々の同位体比分析値と、事実上世界基準のニュージーランド水圏大気研究所による分析値の差が、過去15年以上変化していないことを確認した。
Measurements of age of air by multi-clock tracers in stratosphere

Sugawara Satoshi

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (C)

Institution: Miyagi University of Education

2019/04/01 - 2022/03/31

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In July 2020, the second year of the project period, a balloon experiment was conducted in Taiki, Hokkaido for the purpose of collecting the stratospheric air samples. As a result, it was confirmed that the air samples were successfully collected at all planned altitudes, and their amounts were enough to analyze various gases. Using this stratospheric air sample, a total of more than 20 species of gas concentrations and isotopes, such as greenhouse gases and their related gases, halocarbons, atmospheric major components and noble gases, were analyzed. We estimated the mean ages from the carbon isotope ratio of CO2 and halocarbons in addition to the conventional clock-tracers CO2 and SF6, and the goal of estimating the mean age by the multi-clock-tracers can be achieved. Using the data of past balloon experiments, the mean ages in the tropical stratosphere was theoretically calculated with a numerical model, and the results were published as a paper.
Evaluation of an impact of global warming based on spatiotemporal variations in the atmospheric consitituents corrected for diffusive separation

Ishidoya Shigeyuki

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: National Institute of Advanced Industrial Science and Technology

2019/04/01 - 2022/03/31

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In order to evaluate an impact of global warming based on the observations of the atmospheric O2/N2 and Ar/N2 ratios and stable isotopic ratios of O2, N2 and Ar, it is needed to evaluate an effect of artificial/natural diffusive separation of the components. In the present study, we corrected an artificial diffusive separation on aircraft observations, and we succeeded to observe spatiotemporal variations in O2/N2 ratio from the surface to the upper troposphere. The observational results were compared with the simulated O2/N2 by using a 3-D transport model. Consequently, we evaluated the interhemispheric mixing of air and global CO2 budget. We also observed and simulated gravitational separation in the stratosphere, and we found the secular changes in the surface Ar/N2 ratio, which is expected to be used to estimate global ocean heat content, could be modified by the secular changes in gravitational separation.
Elucidation of global carbon cycle and its climate response

AOKI Shuji

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2018/04/01 - 2022/03/31

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Global scale observations of CO2 concentration, the carbon isotopic ratio (delta13C) of CO2, and oxygen concentration (delta(O2/N2)) in the atmosphere have been made since 2001. Based on the observed secular trends of CO2 concentration and delta(O2/N2) as well as anthropogenic CO2 emission data, the average uptake rates of the anthropogenic CO2 during 2001-2020 among the atmosphere, the terrestrial biosphere and the ocean were estimated to be 44±0.3％, 33±6％ and 23±6％, respectively. By using the observed CO2 and delta13C, the corresponding CO2 uptakes were in good agreement with the former method within the estimated error ranges. The terrestrial biospheric CO2 uptake showed large interannual variability in association with El Nino events.
On the temporal variations of the atmospheric methane concentration by precise measurements of carbon and hydrogen isotopes.

MORIMOTO Shinji, ISHIJIMA kentaro

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2015/04/01 - 2019/03/31

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Systematic and precise measurements of the concentration and carbon and hydrogen isotope ratios of atmospheric methane were conducted by analyzing air samples regularly collected at northern high latitude sites, Antarctic station and in the western Pacific region, and their short-term, seasonal and long-term variations were identified. Simultaneous analysis with the concentration and isotope ratios suggested that the methane from microbial source could be responsible for the observed regrowth of the methane concentration after 2006 and after 2014. Simulations of the isotope ratios of the atmospheric methane with a three-dimensional atmospheric chemistry-transport model and prescribed methane inventory data gave isotopically lighter results than the observed values in this study. This indicates that the contribution ratio of each source category in the prescribed inventory is different from the real methane sources.
Carbonaceous aerosols at Antarctic coasts: Transport from mid-latitudes and origins

Hara Keiichiro, Shiobara Masataka, Morimoto Shinji, Yabuki Masanori, Takashima Hisahiro, Theys Nicolas, Ohnishi Takato, Mikami Nanami, Takeda Masanori, Arakawa Itsuto, Takamura Yumi, Hayashi Masahiko, Kato Keisuke, Eryu Kazunobu, Sugiura Yuuki, Yamada Kyohei, Hirasawa Naohiko, Kobayashi Fumihisa, Saito Akinori, Haraguchi Ryohei

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: Fukuoka University

2015/04 - 2019/03

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Measurements of carbonaceous aerosols were conducted in the Antarctic coasts and southern ocean. Black carbon (BC) concentrations at Syowa Station ranged in <0.2-63.8 ng m-3 (median, 1.8 ng m-3; mean, 2.7 ng m-3) in 2005-2016 and had maximum in September-October. No long-term trend of BC concentrations was clear during our measurement period. Seasonal features of EBC concentrations showed a maximum in September-October. BC was originated from biomass burning and combustion of fossil fuels in South America and southern Africa. BC at the Antarctic coasts were transported from South America and southern Africa mostly via lower troposphere and partly via upper troposphere and downward motion in the Antarctic Circle. The absorption Angstrom exponent (AAE) showed clear seasonal features and was associated with mixing states of BC and organic aerosols supplied from biomass burning and oceanic bio-activity.
A study on the stratospheric circulation by applying gravitational separation

Sugawara Satoshi, Ishidoya Shigeyuki, AOKI Shuji, MORIMOTO Shinji, Honda Hideyuki

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (C)

Institution: Miyagi University of Education

2015/04/01 - 2018/03/31

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The gravitational separation of major atmospheric components, in addition to the age of air, would provide additional useful information about the stratospheric circulation. Air samples were collected over Biak, Indonesia in February 2015 using four large plastic balloons. Air samples from seven different altitudes were analyzed for CO2 and SF6 mole fractions, δ15N of N2, δ18O of O2, and δ(Ar/N2), to examine vertically dependent age and gravitational separation of air in the Tropical Tropopause Layer (TTL) and the equatorial stratosphere. The average values of δ all show small but distinct upward decrease due to the gravitational separation effect. Simulations with a two-dimensional atmospheric transport model indicate that the gravitational separation effect decreases as tropical upwelling is enhanced. The results of this study strongly suggest that the gravitational separation, combined with the age of air, can be used to diagnose air transport processes in the stratosphere.
Evaluation of global warming based on a precise observation of the atmospheric Ar/N2 ratio

Ishidoya Shigeyuki, MATSUEDA Hidekazu, MORIMOTO Shinji

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: National Institute of Advanced Industrial Science and Technology

2015/04/01 - 2018/03/31

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Variations in the atmospheric Ar/N2 ratio at the surface are driven principally by air-sea Ar and N2 fluxes due to changes in solubility, and the Ar/N2 ratio is expected to be a unique tracer for spatiotemporally-integrated air-sea heat flux. We have conducted observations of the Ar/N2 ratio at Tsukuba, Hateruma Island, Cape Ochi-ishi, Takayama, Minamitorishima Island, Japan and at Syowa, Antarctica. The measurement system employing a mass spectrometer was used not only for the continuous observations at Tsukuba but also for the analyses of the air samples collected in flasks at other sites. We found clear seasonal Ar/N2 cycles with summertime maxima at all sites and year-to-year variations in the Ar/N2 ratio, derived from 5-years data at Tsukuba and Hateruma, generally in phase with the variations in the global ocean heat content reported by NOAA/NODC. These facts suggest that the Ar/N2 ratio observed in this study reflected wide-area ocean temperature changes.
Studies on temporal and spatial variations of atmospheric methane in the Arctic region using carbon and hydrogen isotopes

MORIMOTO Shinji, AOKI Shuji, YAMANOUCHI Takashi, YASHIRO Hisashi

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

2011/04/01 - 2015/03/31

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The aim of this research is to obtain knowledge about the cause of temporal and spatial variation of atmospheric methane, which is one of the most important greenhouse gases after carbon dioxide. Systematic observations for the atmospheric CH4 concentration and its carbon and hydrogen isotope ratios had been carried out at four sites in the northern high latitudes. Since the isotope ratios of CH4 have information about CH4 sources, high-precision and systematic observation of both the CH4 concentration and the isotope ratios provide us an insight about the cause of the CH4 concentration variation. It was found from the observation that the CH4 released from wetland and fossil fuel contributed on the seasonal variation of the CH4 concentration. In addition, it is suggested that CH4 emission increase from wetland could be a dominant factor for the CH4 concentration increase observed after 2006.
Global observation of the stratospheric air age

SUGAWARA Satoshi, AOKI Shuji, MORIMOTO Shinji

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: Miyagi University of Education

2011/04/01 - 2014/03/31

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Collections of stratospheric air samples have been carried out over Japan, the eastern equatorial Pacific, and Syowa station, Antarctica, using a balloon-borne cryogenic sampler. The air samples were analyzed for various gas concentrations, such as CO2, CH4, N2O, and SF6, and their isotopes. The CO2 and SF6 concentrations increased from year to year at all heights in the stratosphere. The CO2-age and SF6-age of stratospheric air were estimated by comparing the observed concentrations with the CO2 and SF6 variations at Mauna Loa. The average change rate of the mean age in the mid-stratosphere was 0.04 (+-0.01) years/year. Recent model studies suggest that the global warming should have strengthened the Brewer-Dobson circulation by an enhanced mass flux from the tropical troposphere into the stratosphere, which should result decreasing of the mean age. However, our result shows no decreasing trend of the mean age in the mid-stratosphere for the last 25 years.
Antarctic haze: occurrence, spatial distribution, and long-range transport from mid-latitudes

HARA Keiichiro, HAYSHI Masahiko, SHIOBARA Masataka, HASHIDA Gen, MORIMOTO Shinji

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: Fukuoka University

2010/04/01 - 2014/03/31

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To understand physical/chemical properties, spatial distributions, and frequency of haze appearance, simultaneous measurements of aerosols and gasses were made at Syowa Station, Antarctica. Haze episodes attribute mainly to release of sea-salt particles from sea-ice surface under strong winds. Because the haze phenomena were identified often in July-September, seasonal features of haze appearance might relate to sea-ice extent. Haze layers were distributed mainly in surface-ca. 2 km above ground. In the largest haze conditions, haze layer appeared in surface-ca. 4 km over Syowa Station. After polar sunrise (August-October), surface ozone depletion occurred in the haze phenomena. Thus, Antarctic haze might have an important role in atmospheric chemistry in Antarctic regions.
A study of global methane cycle over the last 130 kyrs based on Antarctic and Greenland deep ice cores

NAKAZAWA Takakiyo, AOKI Shuji, MORIMOTO Shinji, KAWAMURA Kenji, UMEZAWA Taku

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2010 - 2012

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Temporal variations of atmospheric CH_4 concentration over the last 130 kyrs were reconstructed from deep ice cores drilled at Dome Fuji, Antarctica and NGRIP and NEEM, Greenland. By analyzing the reconstructed differences of CH_4 concentration between north and south polar regions using an atmospheric model, spatiotemporal variations of CH_4 emissions from natural sources were closely examined. The values ofδ^<13>C andδD of atmospheric CH_4 were also reconstructed using the Dome Fuji deep ice core. Based on their temporal variations, causes of glacial/interglacial variations in atmospheric CH_4 were discussed especially in terms of changes in CH_4 emissions from natural sources.
Temporal and spatial variations of stratospheric greenhouse gases over the Antarctica revealed by using small-size stratospheric air samplers

YAMANOUCHI Takashi, MORIMOTO Shinji, AOKI Shuji, SUGAWARA Satoshi

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: National Institute of Polar Research

2009 - 2012

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To elucidate vertical distributions and temporal variations of stratospheric greenhouse gases over Antarctic region, whole air samples of 10.7-7.0 LSTP were collected at 4 altitudes from 14 to 29 km above Syowa Station, Antarctica, by using balloon-borne compact cryogenic air samplers. The air samples were analyzed for concentrations of CO2, CH4, N2O and SF6 and ratios of O2/N2 and Ar/N2 in Japan and vertical distributions and secular trends of each component were obtained.
A study on temporal variations of the atmospheric methane concentration at Canadian sub-Arctic region using its carbon and hydrogen isotope ratios

MORIMOTO Shinji, AOKI Shuji, NAKAZAWA Takakiyo, LIN Huang, DOUG Worthy

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: National Institute of Polar Research

2007 - 2010

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Atmospheric methane is one of the most important greenhouse gases and Canadian sub-Arctic is considered to be an important source region of it. We have maintained systematic air sampling at Churchill (58°N, 94°W) and subsequent analyses for stable isotopes of carbon and hydrogen (δ^<13>C、δD) in methane for 4 years. By analyzing their seasonal cycles, it is implied that methane emission from wetland plays an important role in the CH_4 concentration variation.
Study on atmospheric methane variations based on its carbon and hydrogen isotope measurements

AOKI Shuji, NAKAZAWA Takakiyo, MORIMOTO Shinji, SUGAWARA Satoshi, SAEKI Tazu

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (A)

Institution: Tohoku University

2006 - 2009

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Atmospheric CH_4 concentration and its carbon and hydrogen isotopic ratios have been measured on the global scale. By applying the observed data to a global CH_4 cycle model, respective emission ratios of CH_4 from biogenic, fossil and biomass burning sources are estimated to be 70, 16 and 13%. In addition, we revealed variations of CH_4 concentration and these isotopic ratios for the last 250 years by using air samples extracted from firn and ice cores. As a result of the measurements, CH_4 emission from biogenic, fossil and biomass burning sources have increased rapidly since the latter half of 19 century, since the beginning of 20 century and for the last several decades, respectively.
Comprehensive studies of global greenhouse gas cycles in the atmosphere, terrestrial biosphere and oceans

NAKAZAWA Takakiyo, AOKI Shuji, HANAWA Kimio, ISHIDOYA Shigeyuki, SUGAWARA Satoshi, MORIMOTO Shinji, MACHIDA Toshinobu, TOHJIMA Yasunori, MAKSYUTOV Shamil, SAEKI Tazu, PATRA Prabir, ISHIJIMA Kentaro, TOYODA Sakae

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Creative Scientific Research

Institution: Tohoku University

2005 - 2009

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The concentrations and isotopic ratios of CO_2, CH_4 and N_2O, as well as the O_2 concentration, were measured using ground-fixed stations, aircraft, ships and scientific balloons, and global pictures of their temporal and spatial variations were obtained. By analyzing the observed results using newly developed atmospheric transport models, the variations of the three gases were closely examined and their global cycles were quantitatively evaluated. The concentrations of atmospheric CO_2, CH_4 and N_2O over the last 700 kyrs were reconstructed by analyzing the Dome-Fuji deep ice core from Antarctica, and their variations were interpreted.
Study on carbon cycle in forest ecosystem using stable oxygen isotopic measurement

MURAYAMA Shohei, KONDO Hiroaki, SAIGUSA Nobuko, MORIMOTO Shinji

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (C)

Institution: National Institute of Advanced Industrial Science and Technology

2006 - 2007

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Systematic measurements of atmospheric CO_2 concentration and its stable oxygen isotopic ratio (δ^<18>O) in and above the forest together with δ^<18>O of CO_2 in soil an, precipitation, soil water, water vapor and leaf water were made in a cool-temperate deciduous forest at Takayama site in central Japan. Using the observed data, temporal variations of δ^<18>O discriminations during photosynthesis and ecosystem respiration were estimated, and possibility of separating these carbon budget components from net ecosystem CO_2 exchange obtained from the eddy covariance flux measurement was examined. δ^<18>O of atmospheric CO_2 showed more complicated diurnal variation than CO_2 concentration, but prominent δ^<18>O increase appeared in the daytime under sunny and dry conditions, reflecting increase of photosynthetic ^<18>O discrimination. Seasonal variation of daytime δ^<18>O of CO_2 above the forest showed scattered but low values in winter and high values in spring. From late spring to early fall, significant year-to-year difference of the variation was seen with low and high values under respective rainy and sunny summer conditions, which may reflect difference of biological and hydrological processes due to that of meteorological conditions associated with the Asian summer monsoon. Comparison with the data at northern mid latitude sites suggested that the rapid decrease of δ^<18>O seen at Takayama in early summer of the rainy summer year is characteristic of the monsoon Asian region. From comparison of the CO^<18>O fluxes associated with photosynthesis and respiration calculated using a simple one-box canopy air model with the variation of the observed δ^<18>O of CO_2, it was found that the model cannot adequately simulate the δ^<18>O variation. The result suggested that analyses of the δ^<18>O data using a multi-layered canopy process model are necessary to precisely separate photosynthetic and respiratory CO_2 fluxes.
Study on the role of aerosols in polar atmosphere and aerosol-cloud interaction obtained by comparative airborne observations in the Arctic and Antarctic

YAMANOUCHI Takashi, WADA Makoto, SHIOBARA Masataka, HIRASAWA Naohiko, MORIMOTO Shinji, HARA Keiichiro

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (A)

Institution: National Institute of Polar Research

2004 - 2007

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Through airborne observations of aerosols in the Arctic and Antarctic, it was found that a long range transport was crucial to the variations of polar aerosols, and the behavior of black carbon, which has a large impact on climate, might be a matter of discussion in the near future. The major findings were as follows: 1. In May to June 2004, Arctic Study of Tropospheric Aerosol, Cloud and Radiation (ASTAR) 2004 was conducted using two airplanes under the cooperation with Alfred-Wegener Institute of Polar and Marine Research (AVM. Both the scattering coefficients and absorption coefficients obtained by airborne observations showed a lower value compared to those in the Arctic haze term, March to April, obtained in ASTAR 2000. Internal mixture of black carbon in the sulfur aerosol was predominant. Ground based observations showed a transition from spring to summer season with a wet deposition of aerosols by rain, suggesting aerosol-cloud interaction. 2. Japan-German Cooperative Airborne Atmosphere Observation (ANTSY0-II) was carried out using AWI Polar 2, during December 2006 and January 2007. Total of 22 flights were made around Neumayer Station and 15 flights including horizontal flights over the ocean and vertical profile flights over the ice were made around Syowa Station based at S17 point. 3-D distributions of physical, chemical and optical properties of aerosol were obtained, together with an air sampling for greenhouse gases. Atmospheric transports were rather common from Antarctic peninsula at Neumayer area, on the other hand, they were from the Atlantic and South America at Syowa area, and these transports characterized the aerosol properties. Some evidence of black carbon aerosols transported through inland was found. Ground based observations at Syowa Station and ship borne observations on board RV Umitaka Maru showed also some evidence of aerosols of marine biological origin.
Development of a high-precision, continuous measurement system of atmospheric oxygen concentration in Antarctic region.

MORIMOTO Shinji, NAKAZAWA Takakiyo, AOKI Shuji

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (C)

Institution: National Institute of Polar Research

2005 - 2006

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Since variations of atmospheric O_2 concentration are closely related to the global carbon cycle, precise measurements of the O_2 concentration on the order of parts per million will give us a new constraint on the global CO_2 balance research. We have developed a high-precision, continuous measurement system of the atmospheric O_*2 concentration to start an in-situ O_2 measurement at Syowa Station, Antarctica. To improve measurement reproducibility of a commercially available 0_2 analyzer, we at first tried to reduce variations of 0_2 molecule number at the 0_2 sensor by controlling temperature and pressure of the sample air flow. Then, shape and materials of the air sample path were carefully selected to avoid the 0_2 concentration change before analysis. Further, water vapor contained in the sample air was removed by passing the air sample through a Pyrex glass water trap kept at-90°C. At the same time, to reduce the 02 concentration change when the air sample passing the water trap, an active pressure regulation was inserted into the air sample line. Finally, the reproducibility of our 0_2 measurement system reached 0.5-0.8 ppmv. To install the system into Syowa Station, Antarctica, we will make test measurements of the atmospheric 0_2 concentration at Sendai to finalize the development.
Study on environmental signals in polar ice core and reconstruction of environmental change

MOTOYAMA Hideaki, FUJITA Shuji, AZUMA Kumiko, SATOW Kazuhide, NISHIO Fumihiko, SUZUKI Keisuke

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: National Institute of Polar Research

2003 - 2005

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Basic analysis was carried out for the Dome Fuji ice core derived in 2001 following the last fiscal year. The environmental signal to analyze and its environment information are as follows, (1)visible observation -> depositional condition, (2)density profile -> snow densification process, basic information for accumulation rate (3)electrical conductivity of ice -> physical property of ice, acidity of ice (seasonal variation), volcanic eruption (4)stable isotope (d18O, dD) -> temperature variation, water vapor transport, seasonal variation, precipitation (5)chemistry -> aerosol profile, condition of land/ocean/atmosphere. Special analysis was also carried out with basic analysis. As specific research, more detailed environmental change, the history of solar activity research using the amount of cosmic ray generation nuclide or the concentration of nitrate. About the ice core age used as fundamental core information, the accuracy for less than five years determined in general by detecting the trace of volcanic eruptions from change of electrical conductivity and non-sea salt sulfate concentration. About this Dome Fuji ice core, the shallow ice core same at the point 44m away in 1993 was sampled, and the interesting research result was obtained from comparison of both data. The deposition environment of Dome Fuji currently considered to be uniform. But the different of deposition was appeared within several 10m. It showed especially the oxygen isotopic composition. For characteristics of chemistry, there are typical elements in which the same change or the different change are shown. It became clear restoring the environmental signal obtained from the 3029 m ice core at Dome Fuji to the past environment information by examining these synthetically that it should inquire immediately from now on.
Tropospheric transport to Syowa Station, Antarctica : contribution from mid to low latitude

MATSUNAGA Katsuji, IWASAKA Yasunobu, TASAKA Shigeki, SHIOBARA Masataka, MORIMOTO Shinji

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: Nagoya University

2003 - 2005

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Atmospheric observations in this study at Syowa Station, Antarctica include measurements of number-size distribution (ca.5 〜 5000 nm) of aerosol particles, soot concentrations, and collections of size-segregated aerosol samples for chemical analysis etc. Atmospheric Rn and CO concentrations were also measured as tracers of air transport from mid to low latitudes. In addition to year round observation at Syowa Station, atmospheric observations using a ship (Shirase) and an airplane (PC-6) were also conducted to obtain spatial distribution of aerosols. Temporal variations of soot and Rn concentrations imply sporadic transport of air masses from mid latitudes during winter and spring associated with migration of low pressure systems. Aerosol concentrations were always high during blizzard conditions with vigorous winds. Aerosol events under calm wind condition were newly found in winter. Aerosol particles having a mode diameter less than 20 nm were observed for several times from late spring to late summer.
炭素同位体比観測による南北両極域での大気中メタン濃度変動の解明

森本真司

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 若手研究(B)

Institution: 国立極地研究所

2003 - 2004

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大気中のメタン(CH_4)は二酸化炭素(CO_2)に次ぐ重要な温室効果気体として、その放出源・消滅源の変動を定量的に明らかにすることが求められている。これまで大気中CH_4濃度の観測が各国研究機関によって広く行われてきたが、濃度観測のみからは様々なCH_4放出源の寄与それぞれを分離して評価できないために、CH_4濃度の変動原因を特定することは非常に困難であった。CH_4の炭素同位体比(δ^<13>CH_4)は、CH_4の放出源の種類によって値が大きく異なっているため、CH_4濃度とδ^<13>CH_4の同時精密観測を行うことによって、各放出源に関する情報が得られると考えられる。本研究では、まず、ガスクロマトグラフ質量分析計の改造と最適化を行い、少量の大気試料(100cc)を用いて0.05permilの精度でδ^<13>CH_4分析を可能にするシステムを開発した。次に、同様な観測を行っているニュージーランド大気水圏研究所(NIWA)との間で同位体標準ガスの比較実験を実施し、本研究で独自に開発した同位体スケールとNIWAスケール間の関係を把握した。そして、北極・ニーオルスン基地(北緯79度)及び南極・昭和基地(南緯69度)で採取され保存されていた大気試料の分析を行い、北極について1996年から現在まで、南極について2001年から2004年までの高精度時系列データを得た。北極域におけるδ^<13>CH_4は振幅0.4permilの明瞭な季節変化を示しながら経年的にわずかに上昇している。1998年にCH_4濃度の急増が観測されたがδ^<13>CH_4には有意な変動が見られなかったことから、1998年の濃度急増の原因として湿地起源と森林火災によるCH_4放出量増加が考えられる。南極域のδ^<13>CH_4データはまだデータ長が短いために長期トレンドに関する議論はできないが、振幅0.2permilの明瞭な季節変化の検出に成功した。
北極域対流圏・成層圏物質の変動と気候影響

山内恭, 和田誠, 塩原匡貴, 森本真司, 青木周司, 山形定, 橋田元, 遊馬芳雄, 平沢尚彦

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 特定領域研究

Institution: 国立極地研究所

1999 - 2004

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北極域大気の対流圏、成層圏における温室効果気体やエアロゾル、オゾン、雲の変動を明らかにし、その原因となる輸送や生成・消滅/吸収過程の解明をはかり、南極域と対比しつつ、放射効果などを通じた気候への影響を評価することを目的としている。平成16年度は以下の結果を得た。 1.スバールバル諸島ニーオルスン基地における、温室効果気体についての大気サンプリング観測や、地上観測、オゾンの連続観測を継続した。気体濃度の分析として二酸化炭素、メタン、一酸化二窒素、酸素・窒素比、SF6濃度について実施し、さらに安定同位体比として二酸化炭素中の炭素同位体、酸素同位体、メタン中の炭素同位体比を求めた。特に酸素・窒素比から二酸化炭素収支のここ数年の様態が明らかにされた。 2.地上からのエアロゾル・雲のリモートセンシング観測として進めているマイクロパルスライダー観測に併せ全天カメラ観測を行い、雲の情報取得につとめた。レーダ観測は継続しエコー頂高度分布統計値の取得を進めた。 3.北極対流圏エアロゾル雲放射総合観測(ASTAR 2004)に参加した。ドイツ、アルフレッド・ウェーゲナー極地海洋研究所(AWI)の航空機2機を使って、5〜6月に実施したもので、多数の機関が参加した。インパクターの観測からは、先のASTAR2000とは異なる人為的汚染の少ない清浄なエアロゾル組成が明らかにされた。地上観測からは、北極ヘイズの時期が終了し、大気が清浄になる過程がとらえられている。 4.引き続きASTAR 2000(北極対流圏エアロゾル放射総合観測)およびAAMP 02(北極海横断航空機大気観測)の高次のデータ解析が進められ、エアロゾルの分布にクラスター解析を適用した結果や成層圏・対流圏物質交換の指標となる様々な物質の分布が導出された。
南極大気の微量気体成分・エアロゾル循環に果たす南大洋季節海氷域の役割に関する研究

橋田元, 長田和雄, 原圭一郎, 森本真司

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 基盤研究(C)

Institution: 国立極地研究所

2001 - 2003

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南極大陸を取り囲む南大洋の大気中および海洋表層中には様々な化学形態での炭素、窒素、硫黄が存在している。なかでもCO2、NH3、SO2、DMSは、温室効果気体あるいは大気エアロゾルの先駆物質として地球環境に重要な役割が認識されるともに、海洋中の生物活動と密接に関連していることが従来の研究により確認されている。しかし、南大洋がその主要な放出源・吸収源の一つと目されていながら、当該海域では大気および海洋中の濃度の分布や変動要因について、未だ実測データが極めて乏しい。本年度は、南大洋インド洋・オーストラリアセクターにおける東京水産大学「海鷹丸」航海(2003年1月〜3月)、第44次日本南極地域観測隊における専用観測船・「タンガロア」航海(2003年3月)・南極観測船「しらせ」航海(2003年3月)において、微量気体成分濃度、特に表面海水中の二酸化炭素濃度分圧および溶存無機全炭酸濃度の観測を実施した。「海鷹丸」航海および「タンガロア」航海には本研究における研究協力者(東北大学大学院生・中岡慎一郎氏)が乗船して観測に従事した。昨年度は、東経140度線を共通の観測線とし、かつ、季節海氷域における夏季グルーミングの初期から終期に至る期間に重ならないよう設定された3つの研究航海(東京大学海洋研究所「白鳳丸」KH-01-3次研究航海;2001年11月〜2002年3月、第43次日本南極地域観測隊における専用観測船・「タンガロア」航海;2002年2月、南極観測船「しらせ」航海;2002年3月)においても同様の観測を行っており、観測時期や海域は本年度の観測と重なっており、両年度の観測結果を合わせて解析を進めている。
炭素同位体比を用いた北極域における大気中のメタン濃度の変動に関する研究

森本真司

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 若手研究(B)

Institution: 国立極地研究所

2001 - 2002

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大気中のメタンは二酸化炭素に次いで重要な温室効果気体であり、産業革命以降の人間活動の活発化によって濃度が急激に増加していることが知られている。大気中メタンの現在の収支を明らかにするため、これまで主に大気中メタン濃度の観測が行われてきたが、地球表層におけるメタンの放出源が多岐にわたっていること、及び大気中のOHラジカルとの反応でメタンが消滅することなどから、濃度観測のみからは収支の推定が困難であると考えられる。本研究では、メタンの放出源や消滅反応に関する情報を持つ、メタンの炭素同位体比(δ^<13>CH_4)の精密観測を日指して、現有のガスクロマトグラフ質量分析計の改良を行ってきた。その結果、従来のδ^<13>CH_4分析に必要であった空気試料量の約1/100である50〜100mlの試料を用いて、δ^<13>CH_4値を従来法と同程度の精度(0.04-0.08パーミル)で精密分析可能にするシステムの開発に成功した。本システムを用いて、北極・ニーオルスン観測基地(北緯79度、東経15度)で採取された大気試料、及び過去にニーオルスンで採取されその一部を保存していた大気試料のδ^<13>CH_4分析を行い、1999年7月から2003年3月までの時系列データを得た。ニーオルスンにおけるδ^<13>CH_4は明瞭な季節変化を示し、9-10月に最低値、6月に最高値が観測された。これは、メタン濃度の季節変化(7-8月に最低値、11-1月に最高値を示す)と明らかに位相が異なっており、それぞれのメタン放出強度の季節変化に位相差があることに加え、夏期にOHラジカルとの反応によってメタンが消滅する際の同位体分別を反映していると考えられる。本研究で得られた約3年半のδ^<13>CH_4時系列データから、不規則な経年変動の存在が示唆された。このことは、地球表層でのメタン循環が年々変動していることを示しているが、結論を得るためには更に長期間の高精度データを蓄積する必要がある。
Development of a balloon-borne stratospheric air sampler.

YAMANOUCHI Takashi, HIRASAWA Naohiko, MORIMOTO Shinji, HASHIDA Gen, ISHIKAWA Kozue, AOKI Shuji

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B).

Institution: National Institute of Polar Research

1998 - 2000

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In order to clarify distributions and variations of greenhouse gases in the stratosphere, it is necessary to develop a small and light weight air sampling system that can be used with a small balloon. For this purpose, we have developed a new cryogenic air sampler using adiabatic expansion of high pressure neon gas. In the present study, we produced prototypes of the sampler and performed air sampling experiments with three kinds of cryo-head. The results obtained are summarized as follows : It was confirmed that the temperature at the cryo-head decreased down to the liquefied point of neon (27K) after 150 to 240 seconds of neon gas introduction. Air sample, of which pressure was set to be from 25 to 200 hPa, was collected cryogenically by the sampling system at a rate from 0.4 to 1.2 standard litters per minute. Total amount of the collected air sample was about 6.0 and 3.0 standard liters when the sample pressures were 25 and 200 hPa, respectively. The sampling rate measured by a mass flow meter showed different patterns depending on the sample pressure. When the sample pressure was below 60 hPa, the air sampling continued at least 10 minutes. On the other hand, for the air sample above 120 hPa, the air sampling terminated about 3 minutes after the sampling started. The cause of the difference was seemed to be the fact that the temperature of a part of the cryo-head was above the melting point of oxygen for the air sample above 120 hPa. To obtain more amount of air sample, further modifications should be made for the cryo-head.
温室効果気体と気候変動研究

青木周司, 森本真司, 町田敏暢, 中澤高清

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 特定領域研究(B)

Institution: 東北大学

1998 - 2000

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本研究においては、ドームふし氷床コアから空気を抽出し分析することによって、主要な温室効果気体である二酸化炭素やメタン、一酸化二窒素の過去34万年に及ぶ変動の実態を明らかにし、さらに各気体成分の変動と気候変動との関係を明らかにした。それによれば、二酸化炭素濃度やメタン濃度は、暖候期には高く、寒候期には低くなっており、気温変化に極めて良く対応して変化したことが明らかになった。特に、メタン濃度は氷期・間氷期といった大規模な気候変動や、氷期中の比較的大きな気温変動に対応して変化しているばかりではなく、間氷期においてもヤンガ-ドライアス期やわずかな気候の寒冷化にも敏感に対応して変化していた。このことから、二酸化炭素とメタンが気候変動に正のフィードバック作用を及ぼしていたことが確認された。一方、一酸化二窒素についても氷期に低く間氷期に高いといった基本的な濃度変化が明らかになったが、濃度と気温との相関は比較的低かった。一酸化二窒素濃度が氷期の最寒期には310ppbvを越すような異常に高い値が必ず現れていたことを新たに見出した。このような高濃度は人間活動の影響が顕在化している現在の値よりも高く、氷期に露出した大陸棚での生物活動が関係している可能性が考えられる。また、コアから抽出した試料空気の酸素と窒素の同位体比を測定し、コアの年代決定の有効性およびコアへの大気成分の取り込み過程を検討した。これに関連して、フィルン空気の分析も行っており、その結果をモデルでシュミレートすることにより、空気が氷床に取り込まれる際の大気成分の濃度や同位体比の変化や、コア中の気泡とそれを取り巻く氷の年代差についても評価することができた。その結果、気泡の年代はそれを取り巻く氷の年代より常に若く、間氷期では年代差が約2000年であり、氷期には最大5000年まで拡大することが明らかになった。
Variations and Cycles of Greenhouse Gases on the Earth's Surface

NAKAZAWA Takakiyo, NAKAMURA Toshio, YOSHIDA Naohiro, MAKIDE Yoshihiro, MORIMOTO Shinji, AOKI Shuji

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research on Priority Areas (A)

Institution: Tohoku University

1998 - 2000

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In order to elucidate variations and cycles of greenhouse gases on the Earth's surface, extensive studies with systematic measurements and development of numerical models were performed. The results obtained from this study are summarized as follows : (l) The concentrations and isotopic ratios of various greenhouse gases such as CO_2, CH_4, N_2O, CO, HCFC, HFC, PFC and SF_6 were systematically measured over Japan, the Pacific Ocean, Siberia, Syowa Station and Spitzbergen Islands, and their temporal and spatial variations as well as causes and governing processes were clarified. Measurements of the isotopomers of atmospheric N_2O succeeded for the first time, and quantitative estimation of the N_2O budget was tried on the basis of the measurement results. Double-deconvolution analysis of the CO_2 concentration and its δ^<13>C was also made to elucidate the recent global budget of anthropogenic CO_2. Furthermore, temporal changes in HCFC, HFC and SF_6 emissions were investigated using a northernsouthern hemispheric two box-model and their measurement results. (2) A three-dimensional atmospheric transport model was developed and then applied to elucidate their global cycles in terms of the concentration and δ^<13>C.A spatially high-resolution ecosystem model was also developed to examine the role of the terrestrial biosphere in the global carbon cycle, and partial pressure differences of CO_2 between the atmosphere and the ocean were calculated and ocean uptake of CO_2 was estimated using a newly developed three-dimensional ocean carnon cycle model. A multi-box model developed in this study succeeded in reconstructing the history of the atmtospheric N_2O concentration over the last 500 years. (3) For a better understanding of the carbon cycle between the atmosphere and the lithosphere, carbon fluxes due to weathering and the release of carbon from the deep underground were quantitatively estimated by their extensive measurements. Systematic measurements were also carried out in several coral reefs in Okinawa, and it was revealed that the role of coral in the ocean carbon cycle was different depending on coral itself.
炭素同位体比を用いた地球表層における二酸化炭素循環の研究

森本真司

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 奨励研究(A)

Institution: 国立極地研究所

1997 - 1998

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大気中の二酸化炭素(CO_2)の炭素同位体比(d^3C)は、大気と表層海洋、陸上生物圏の間でCO_2が交換される際に異なった同位体分別効果を受けるため、大気中のCO_2濃度の変動原因に関する情報を持つ。本研究では、地球表層におけるCO_2の循環を定量化するために、西太平洋域におけるCO_2濃度、d^3Cの観測と二次元大気輸送モデルを用いたCO_2の放出源・吸収源分布の推定を行った。まず、d^3Cは北半球で明瞭な季節変化を示し、4〜5月に極小値、8月に極大値をとる。d^3Cの季節変化成分をCO_2濃度と比較することにより、北半球におけるCO_2濃度の季節変化は大気ー陸上生物圏間のCO_2交換量の変動に起因することが明らかになった。d^3Cの経年変化に注目すると、化石燃料起源の同位体的に軽いCO_2が大気に加えられているために、d^3Cはすべての緯度帯で約-0.03茗/年の減少率を示した。ENSOイベントが発生したあと、ある時間遅れを伴って大気中のCO_2濃度が急増することが知られているが、このCO_2濃度の急増に同期してd^3Cは急激に減少していることが明らかになった。本研究で得られだCO_2濃度とd^3Cの観測値からCO_2濃度の放出源・吸収源の緯度分布と変動を定量化するために、緯度ー高度方向の二次元大気輸送モデルを開発した。この二次元モデルにCO_2濃度とd^3Cの観測値を入力し、インバースモードで解いて各緯度帯からのCO_2放出・吸収量を求め、さらにCO_2放出・吸収における表層海洋と陸上生物圏の寄与を分離した。その結果、表層海洋は赤道域でCO_2を大気に放出し、それ以外の緯度帯でCO_2を吸収していること、陸上生物圏は北半球中高緯度で大量のCO_2を吸収していることが明らかになった。また、ENSOが発生したときには、南北両半球低緯度域の陸上生物圏がCO_2の強い放出源になっていることが推定された。
Variations and cycles of greenhouse gases in the Arctic

NAKAZAWA Takakiyo, MORIMOTO Shinji, SHIOBARA Masataka, WADA Makoto, AOKI Shuji, YAMANOUCHI Takashi

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for international Scientific Research

Institution: Tohoku University

1997 - 1998

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In order to elucidate variations of greenhouse gases and aerosols in the atmosphere in the Arctic, their comprehensive measurements were carried out at Svalbard in July 1998 and December 1998-March 1999. These measurements provided valuable information about variations and distributions of CO2, CH4, N2O and O3 in the Arctic. These measurements also revealed characteristic features of atmospheric aerosols from winter to spring. For a better understanding of a 3-dimensional distribution of atmospheric constituents in the Arctic, we made measurements during the period March 6-14, 1998, using a chartered jet aireraft equipped with continuous measurement systems of CO2 and O3, air sampler, aerosol counter, aerosol sampler and others. The aircraft measurements were conducted mainly on transit flight moots of approximately 12 km height over the Arctic Sea. The measurements were also made over Spitzbergen Islands and Pt.Barrow, Alaska, to observed vertical profiles of relevant components from the surface to 12 km. The results showed (1) that the CO2 and O3 concentrations were changed abruptly near the tropopause, suggesting that the vertical air exchange is suppressed, (2) that a positive correlation was clearly seen between the CH4 and N2O concentrations in the stratosphere, which is quite similar to the results obtained in the stratosphere over Sweden in February and March 1997, (3) that the measured vertical profiles of COS suggested that COS is a supplier of sulfur for stratospheric aerosols, (4) that the Arctic haze was sometimes observed to reach the upper troposphere, showing multi-layers, and (5) that by analyzing aerosols collected directly, sulfate particles and sea salt particles were mainly found in the stratosphere and the free atmosphere and below the top of the mixed layer, respectively.
Development of a cryogenic air sampling system for unmanned aircraft observation.

WADA Makoto, ISHIKAWA Kozue, YAJIMA Nobuyuki, MORIMOTO Shinji, SHIOBARA Masataka

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (A)

Institution: National Institute of Polar Research

1995 - 1997

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In order to clarify distributions and variations of atmospheric trace gases in the stratosphere using an unmanned aircraft, it is necessary to develop a small and light weight air sampling system. For this purpose, we developed and tested a new cryogenic air sampler using neon Joule-Thomson (JT) cooler. The results are summarized as follows : 1. An refrigeration capacity of neon JT cooler was experimentally determined. The results showed that the neon JT cooler produced refrigeration of about 23 Joule/second at neon gas pressure of 130 kgf/cm^2 and of nearly zero at 50 kgf/cm^2. It was also confirmed that the neon gas was liquefied after 50 to 150 seconds of the neon gas introduction. 2. Low pressure nitrogen was introduced into a new cryogenic air sampling system in which the JT cooler was equipped, and sampling rate of nitrogen were measured. the sampling rate was between 0.7 and 1.0 normal litter/minutes at nitrogen pressure of 100 hPa and between 0.3 and 0.7 normal litter/minutes at 5 hPa. these results indicate that it is necessary to increase the sampling rate to realize a practical sampling system. 3. To examine the composition of air after sampled by the cryogenic sampling system, an air-base standard gas, of which methan concentration was already determined, were introduced into the sampling system and sampled cryogenically. As a result, the methan concentration of the sample was confirmed to be identical to that of the standard gas within the measurement precision. 4. A high conductance valve system was successfully developed using a pipe breaking cutter, cold weld and N-S joint techniques. Because the valve system was composed only by straight tubes, high conductance was easily attained even if relatively thin tube was used.
Observations of Polar Aerosols at Alaksa and Spitsbergen : Its influence on the global environmental change

SHIBATA Takasi, BRAATHEN G.O, SHAW G, NEUBER R, MIRIMOTO Shinji, WADA Makoto, FUJIWARA Motoo, OKANO Shouiti, TAGUTI Makoto, HUKUNISI Hirosi, OSADA Kazuo, HAYASI Masahiko, MATSUNAGA Katuji, IWASAKA Yasunobu, YASUI M

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for international Scientific Research

Institution: Nagoya University

1995 - 1996

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The main purpose of this project is the research of the polar stratospheric clouds over Arctic region. We have obtained the following results by the research of the two years : 1) The vertical profiles of PSCs over spitsbergen were observed in the two winter seasons on 1995/1996 and 1996/1997.2) The vertical profiles of ozone over Fairbanks, Alaska were observed in the same winter seasons. 3) The aerosol profiles over Fairbanks were observed by lidar in two years between April 1995 and March 1997.4) The aerosols were directly sampled near the ground level in the same period of the observations of PSCs. The components of the aerosols were obtained by the Chemical analysis. The followings have been found by the results above : 5) The large size liquid PSC particles are often found in the Arctic PSCs. 6) Those PSCs are specially formed when the ambient temperature is dropped near the frost point of ice. It is reported that the stratospheric ozone was largely depleted over Arctic in the winter 1995/1996. The homogeneous reaction over the PSC particle are thought as the main process that causes the ozone loss. The liquid particles mentioned in 5) would playd major roll in the process. The lidar observed data will geve us precious data set to study the heterogeneous process.
Characteristics of Arctic Air-Ice-Ocean System

ONO Nobuo, FORSBERG Carl F., KODAMA Yuji, USHIO Shuki, KUDOH Sakae, ITO Hajime, HIRASAWA Naohiko, AOKI Shuji, WADA Makoto, YAMANOUCHI Takashi, KORSNES Reinert, VINJE Torgny, ORAEK Jon B.

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for international Scientific Research

Institution: National Institute of Polar Research

1993 - 1995

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Observation was made in and around Ny Alesund, Svalbard, on the Arctic stratus, minor particles in the air, marine structure of the fjord, ecology in the fjord and snow/glacier hydrology.Observation of physical oceanography was also made in Greenland Sea, Barents Sea and Svalbard Water using Norwegian Research Vessels. In the third year, 1995, the joint research was focused through the activities : co-organizing International Symposium on the Arctic Environment Research, Tokyo, 19-21 July 1995 and inviting the leader of the joint partner Torgny Vjnie, Norwegian Institute of Polar Research, for discussion.In the latter occasion a work shop was also held : Arctic Atmosphere-Ice-Ocean System, 18 March 1996. The seasonal difference in the cloud structure and radiation were detected through the research.The snow-melting mechanism, which is influenced strongly by these factors, was made clear and the fresh water supply to the fjord was estimated.The mechanism, how the fresh water was taken into the salty fjord water was, then unveiled.Employing the different mechanism in each fjord as an indicator, a classification of Svalbard fjords was attempted.Remarkable ecological phenomena were detected in each fjords.The different structures were also detected in larger scale : Greenland Sea vs. Barents Sea, where again different ecological conditions prevail.

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北極気候に関わる大気物質

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北極域における温室効果気体の動態とその変動原因を明らかにする
北極域における温室効果気体の循環とその気候応答の解明

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北半球高緯度域における大気中の二酸化炭素やメタン、一酸化二窒素などの温室効果気体濃度やそれらの同位体および関連する酸素濃度などの分布や変動を、地上基地、航空機を用いた総合的な観測から詳細に明らかにする。