Updated on 2026/04/25

写真a

 
OISHI RYOUTA
 
Organization
School of Science Researcher
Title
Researcher
Profile
研究課題と活動状況: 大気海洋植生結合大循環モデルを用いて、主として古気候・古環境再現を行うことで、植生変化の気候形成に対する役割を調べています。極域から熱帯までの全陸上を対象としています。
External link

Degree

  • 博士（理学） ( 2006.3   東京大学 )

Research Interests

  • 気候植生相互作用

  • 古植生モデリング

  • 古気候モデリング

  • 大気海洋植生結合モデル

  • 氷床

  • 温暖期

  • 最終氷期

  • 大循環モデル

  • 気候モデリング

  • 気候学

  • 古気候

  • 水循環

  • 大気陸面相互作用

  • 炭素循環

Research Areas

  • Natural Science / Atmospheric and hydrospheric sciences

  • Environmental Science/Agriculture Science / Environmental dynamic analysis

Education

  • The University of Tokyo   Graduate School of Science   Department of Earth and Planetary Science

    2001.4 - 2006.3

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  • The University of Tokyo   Graduate School of Science   Department of Earth and Planetary Physics

    1999.4 - 2001.3

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  • The University of Tokyo   Faculty of Science   Department of Earth and Planetary Physics

    1995.4 - 1999

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  • 神奈川県立小田原高等学校

    1991.4 - 1994.3

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Research History

  • Institute of Science Tokyo   Researcher

    2025.11

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  • The University of Tokyo

    2025.10 - 2026.3

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  • The University of Tokyo   Atmosphere and Ocean Research Institute

    2025.4

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  • The University of Tokyo   Atmosphere and Ocean Research Institute   Researcher

    2016.4 - 2025.9

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  • National Institute of Polar Research   Researcher

    2013.3 - 2016.4

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  • The University of Tokyo   Atmosphere and Ocean Research Institute   Researcher

    2010.4 - 2012.2

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  • The University of Tokyo   Center for Climate System Research   Researcher

    2007.4 - 2010.3

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  • The University of Tokyo   Center for Climate System Research   Researcher

    2006.4 - 2007.3

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Professional Memberships

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Papers

  • Impact of the temperature-cloud phase relationship on the simulated Arctic warming during the Last Interglacial

    Nozomi Arima, Masakazu Yoshimori, Ayako Abe-Ouchi, Ryouta O'ishi, Wing-Le Chan, Sam Sherriff-Tadano, Tomoo Ogura

    Climate of the Past   2026.4

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.5194/cp-22-891-2026

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  • Investigating the roles of CO2 and paleogeography in shaping the Pliocene climate using an atmosphere-ocean-vegetation coupled model

    Sachio Nakagawa, Ayako Abe-Ouchi, Wing-Le Chan, Ryouta O'ishi, Taro Higuchi

    2026.3

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  • Arctic Warming Suppressed by Remnant Glacial Ice Sheets in Past Interglacials Reviewed

    Lynn A. Hirose, Ayako Abe‐Ouchi, Wing‐Le Chan, Ryouta O'ishi, Masakazu Yoshimori, Takashi Obase

    Geophysical Research Letters   2025.3

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1029/2024GL111798

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  • Comparison of ground temperature and permafrost conditions in the Arctic simulated by land surface process models of different complexity Reviewed

    Junko MORI, Kazuyuki SAITO, Shin MIYAZAKI, Hirokazu MACHIYA, Takeshi ISE, Tetsuo SUEYOSHI, Takeshi YAMAZAKI, Yoshihiro IIJIMA, Hiroki IKAWA, Ryouta O’OISHI, Takeshi OHTA, Genki KATATA, Ayumi KOTANI, Atsushi SATO, Hisashi SATO, Atsuko SUGIMOTO, Rikie SUZUKI, Katsunori TANAKA, Tomoko NITTA, Tomohiro HAJIMA, Eleanor BURKE, Hotaek PARK

    Bulletin of Glaciological Research   42   69 - 94   2024

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    Publishing type：Research paper (scientific journal)   Publisher：Japanese Society of Snow and Ice  

    DOI： 10.5331/bgr.23a02

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  • Astronomical forcing shaped the timing of early Pleistocene glacial cycles Reviewed

    Yasuto Watanabe, Ayako Abe-Ouchi, Fuyuki Saito, Kanon Kino, Ryouta O’ishi, Takashi Ito, Kenji Kawamura, Wing-Le Chan

    Communications Earth & Environment   4 ( 1 )   2023.5

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Springer Science and Business Media {LLC}  

    <jats:title>Abstract</jats:title><jats:p>Glacial cycles during the early Pleistocene are characterised by a dominant 41,000-year periodicity and amplitudes smaller than those of glacial cycles with ~100,000-year periodicity during the late Pleistocene. However, it remains unclear how the 41,000-year glacial cycles during the early Pleistocene respond to Earth’s astronomical forcings. Here we employ a three-dimensional ice-sheet model to simulate the glacial cycles at ~1.6–1.2 million years before present and analyse the phase angle of precession and obliquity at deglaciations. We show that each deglaciation occurs at every other precession minimum, and when obliquity is large. The lead-lag relationship between precession and obliquity controls the length of interglacial periods, the shape of the glacial cycle, and the glacial ice-sheet geometry. The large amplitudes of obliquity and eccentricity during this period helped to establish robust 41,000-year glacial cycles. This behaviour is explained by the threshold mechanism determined by ice-sheet size and astronomical forcings.</jats:p>

    DOI： 10.1038/s43247-023-00765-x

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  • Role of astronomical forcing in shaping the 41-kyr glacial cycles before the Middle Pleistocene Transition Reviewed

    Yasuto Watanabe, Ayako Abe-Ouchi, Fuyuki Saito, Kanon Kino, Ryouta O'ishi, Takashi Ito, Kenji Kawamura, Wing-Le Chan

    2022.10

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  • Increased interglacial atmospheric CO2 levels followed the mid-Pleistocene Transition Reviewed

    Masanobu Yamamoto, Steven C. Clemens, Osamu Seki, Yuko Tsuchiya, Yongsong Huang, Ryouta O’ishi, Ayako Abe-Ouchi

    Nature Geoscience   15 ( 4 )   307 - 313   2022.4

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Springer Science and Business Media {LLC}  

    DOI： 10.1038/s41561-022-00918-1

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  • PMIP4 experiments using MIROC-ES2L Earth system model Reviewed

    Rumi Ohgaito, Akitomo Yamamoto, Tomohiro Hajima, Ryouta O'ishi, Manabu Abe, Hiroaki Tatebe, Ayako Abe-Ouchi, Michio Kawamiya

    Geoscientific Model Development   14 ( 2 )   1195 - 1217   2021.3

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Copernicus GmbH  

    Abstract. Following the protocol of the fourth phase of the Paleoclimate
    Modelling Intercomparison Project (PMIP4), we performed numerical experiments
    targeting distinctive past time periods using the Model for
    Interdisciplinary Research on Climate, Earth System version 2 for Long-term
    simulations (MIROC-ES2L), which is an Earth system model. Setup and basic
    performance of the experiments are presented. The Last Glacial Maximum was one of the most extreme climate states during
    the Quaternary and conducting numerical modeling experiments of this period
    has long been a challenge for the paleoclimate community. We conducted a
    Last Glacial Maximum experiment with a long spin-up of nearly 9000 years.
    Globally, there was reasonable agreement between the anomalies relative to the present day derived from model climatology and those derived from proxy data archives, while some regional discrepancies remained. By changing orbital and greenhouse gas forcings, we conducted experiments
    for two interglacial periods: 6000 and 127 000 years before present. Model
    anomalies relative to the present day were qualitatively consistent with
    variations in solar forcing. However, anomalies in the model were smaller
    than those derived from proxy data archives, suggesting that processes that
    play a role in past interglacial climates remain lacking in this
    state-of-the-art model. We conducted transient simulations from 850 to 1850 CE and from 1850
    to 2014 CE. Cooling in the model indicated a clear response to huge volcanic
    eruptions, consistent with paleo-proxy data. The contrast between cooling
    during the Little Ice Age and warming during the 20th to 21st
    centuries was represented well at the multidecadal timescale.

    DOI： 10.5194/gmd-14-1195-2021

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  • A multi-model CMIP6-PMIP4 study of Arctic sea ice at 127 ka: sea ice data compilation and model differences Reviewed

    Masa Kageyama, Louise C. Sime, Marie Sicard, Maria-Vittoria Guarino, Anne de Vernal, Ruediger Stein, David Schroeder, Irene Malmierca-Vallet, Ayako Abe-Ouchi, Cecilia Bitz, Pascale Braconnot, Esther C. Brady, Jian Cao, Matthew A. Chamberlain, Danny Feltham, Chuncheng Guo, Allegra N. LeGrande, Gerrit Lohmann, Katrin J. Meissner, Laurie Menviel, Polina Morozova, Kerim H. Nisancioglu, Bette L. Otto-Bliesner, Ryouta O'ishi, Silvana Ramos Buarque, David Salas y Melia, Sam Sherriff-Tadano, Julienne Stroeve, Xiaoxu Shi, Bo Sun, Robert A. Tomas, Evgeny Volodin, Nicholas K. H. Yeung, Qiong Zhang, Zhongshi Zhang, Weipeng Zheng, Tilo Ziehn

    Climate of the Past   17 ( 1 )   37 - 62   2021.1

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    Publishing type：Research paper (scientific journal)   Publisher：Copernicus GmbH  

    DOI： 10.5194/cp-17-37-2021

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  • Large-scale features of Last Interglacial climate: results from evaluating the &amp;lt;i&amp;gt;lig127k&amp;lt;/i&amp;gt; simulations for the Coupled Model Intercomparison Project (CMIP6)–Paleoclimate Modeling Intercomparison Project (PMIP4) Reviewed

    Bette L. Otto-Bliesner, Esther C. Brady, Anni Zhao, Chris M. Brierley, Yarrow Axford, Emilie Capron, Aline Govin, Jeremy S. Hoffman, Elizabeth Isaacs, Masa Kageyama, Paolo Scussolini, Polychronis C. Tzedakis, Charles J. R. Williams, Eric Wolff, Ayako Abe-Ouchi, Pascale Braconnot, Silvana Ramos Buarque, Jian Cao, Anne de Vernal, Maria Vittoria Guarino, Chuncheng Guo, Allegra N. LeGrande, Gerrit Lohmann, Katrin J. Meissner, Laurie Menviel, Polina A. Morozova, Kerim H. Nisancioglu, Ryouta O'ishi, David Salas y Mélia, Xiaoxu Shi, Marie Sicard, Louise Sime, Christian Stepanek, Robert Tomas, Evgeny Volodin, Nicholas K. H. Yeung, Qiong Zhang, Zhongshi Zhang, Weipeng Zheng

    Climate of the Past   17 ( 1 )   63 - 94   2021.1

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    Publishing type：Research paper (scientific journal)   Publisher：Copernicus GmbH  

    DOI： 10.5194/cp-17-63-2021

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  • PMIP4/CMIP6 last interglacial simulations using three different versions of MIROC: Importance of vegetation Reviewed

    Ryouta O'Ishi, Wing Le Chan, Ayako Abe-Ouchi, Sam Sherriff-Tadano, Rumi Ohgaito, Masakazu Yoshimori

    Climate of the Past   17 ( 1 )   21 - 36   2021.1

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    Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Copernicus {GmbH}  

    DOI： 10.5194/cp-17-21-2021

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  • Comparison of past and future simulations of ENSO in CMIP5/PMIP3 and CMIP6/PMIP4 models Reviewed

    Josephine R. Brown, Chris M. Brierley, Soon-Il An, Maria-Vittoria Guarino, Samantha Stevenson, Charles J. R. Williams, Qiong Zhang, Anni Zhao, Ayako Abe-Ouchi, Pascale Braconnot, Esther C. Brady, Deepak Chandan, Roberta D'Agostino, Chuncheng Guo, Allegra N. LeGrande, Gerrit Lohmann, Polina A. Morozova, Rumi Ohgaito, Ryouta O'ishi, Bette L. Otto-Bliesner, W. Richard Peltier, Xiaoxu Shi, Louise Sime, Evgeny M. Volodin, Zhongshi Zhang, Weipeng Zheng

    Climate of the Past   16 ( 5 )   1777 - 1805   2020.9

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    Publishing type：Research paper (scientific journal)   Publisher：Copernicus GmbH  

    DOI： 10.5194/cp-16-1777-2020

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  • Inner Edge of Habitable Zones for Earth‐Sized Planets With Various Surface Water Distributions Reviewed

    T. Kodama, H. Genda, R. O'ishi, A. Abe‐Ouchi, Y. Abe

    Journal of Geophysical Research: Planets   124 ( 8 )   2306 - 2324   2019.8

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    Publishing type：Research paper (scientific journal)   Publisher：American Geophysical Union (AGU)  

    Abstract

    When planets receive insolation above a certain critical value called the runaway threshold, liquid surface water vaporizes completely, which forms the inner edge of the habitable zone. Because land planets can emit a large amount of radiation from the dry tropics, they have a higher runaway threshold than aqua planets do. Here we systematically investigated the runaway threshold for various surface water distributions using a three‐dimensional dynamic atmosphere model. The runaway threshold for the meridionally uniform surface water distribution increases from the typical value for the aqua planet regime (~130% S0) to one for the land planet regime (~155% S0) as the dry surface area increases, where S0 is the present Earth's insolation. Although this result is similar to the previous work considering zonally uniform surface water distributions, the runaway threshold for the land planet regime is quite low compared to that of the previous work. This is because a part of the tropical atmosphere is always wet for the meridionally uniform case. We also considered the surface water distributions determined by the Earth's, Mars's, and Venus's topographies. We found that their runaway thresholds are close to that for the meridionally uniform cases, and the amount of water at the boundary between an aqua planet regime and land planet regime is around 10% of the Earth's ocean. This clearly shows that the runaway threshold is not determined uniquely by the luminosity of the central star, but it has a wide range caused by the surface water distribution of the terrestrial water planet itself.

    DOI： 10.1029/2019je006037

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    Other Link： https://onlinelibrary.wiley.com/doi/full-xml/10.1029/2019JE006037

  • Description and basic evaluation of simulated mean state, internal variability, and climate sensitivity in MIROC6 Reviewed

    Tatebe Hiroaki, Ogura Tomoo, Nitta Tomoko, Komuro Yoshiki, Ogochi Koji, Takemura Toshihiko, Sudo Kengo, Sekiguchi Miho, Abe Manabu, Saito Fuyuki, Chikira Minoru, Watanabe Shingo, Mori Masato, Hirota Nagio, Kawatani Yoshio, Mochizuki Takashi, Yoshimura Kei, Takata Kumiko, O'ishi Ryouta, Yamazaki Dai, Suzuki Tatsuo, Kurogi Masao, Kataoka Takahito, Watanabe Masahiro, Kimoto Masahide

    GEOSCIENTIFIC MODEL DEVELOPMENT   12 ( 7 )   2727 - 2765   2019.7

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.5194/gmd-12-2727-2019

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  • Effect of high dust amount on surface temperature during the Last Glacial Maximum: a modelling study using MIROC-ESM Reviewed

    Rumi Ohgaito, Ayako Abe-Ouchi, Ryouta O'ishi, Toshihiko Takemura, Akinori Ito, Tomohiro Hajima, Shingo Watanabe, Michio Kawamiya

    Climate of the Past   14 ( 11 )   1565 - 1581   2018.11

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    Publishing type：Research paper (scientific journal)   Publisher：Copernicus GmbH  

    Abstract. The effect of aerosols is one of many uncertain factors in projections offuture climate. However, the behaviour of mineral dust aerosols (dust) can beinvestigated within the context of past climate change. The Last GlacialMaximum (LGM) is known to have had enhanced dust deposition in comparisonwith the present, especially over polar regions. Using the Model forInterdisciplinary Research on Climate Earth System Model (MIROC-ESM), weconducted a standard LGM experiment following the protocol of thePaleoclimate Modelling Intercomparison Project phase 3 and sensitivityexperiments. We imposed glaciogenic dust on the standard LGM experiment andinvestigated the impacts of glaciogenic dust and non-glaciogenic duston the LGM climate. Global mean radiative perturbations by glaciogenic andnon-glaciogenic dust were both negative, consistent with previous studies.However, glaciogenic dust behaved differently in specific regions; e.g. itresulted in less cooling over the polar regions. One of the major reasons forreduced cooling is the ageing of snow or ice, which results in albedoreduction via high dust deposition, especially near sources of highglaciogenic dust emission. Although the net radiative perturbations in thelee of high glaciogenic dust provenances are negative, warming by the ageing ofsnow overcomes this radiative perturbation in the Northern Hemisphere. Incontrast, the radiative perturbation due to high dust loading in thetroposphere acts to warm the surface in areas surrounding Antarctica,primarily via the longwave aerosol–cloud interaction of dust, and it islikely the result of the greenhouse effect attributable to the enhanced cloudfraction in the upper troposphere. Although our analysis focused mainly onthe results of experiments using the atmospheric part of the MIROC-ESM, wealso conducted full MIROC-ESM experiments for an initial examination of theeffect of glaciogenic dust on the oceanic general circulation module. Along-term trend of enhanced warming was observed in the Northern Hemispherewith increased glaciogenic dust; however, the level of warming aroundAntarctica remained almost unchanged, even after extended coupling with theocean.

    DOI： 10.5194/cp-14-1565-2018

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  • Energy-water budget analysis of an Arctic terrestrial models intercomparison GTMIP Reviewed

    Saito, K, J. Mori, H. Machiya, S. Miyazaki, T. Ise, T. Sueyoshi, T. Yamazaki, Y. Iijima, H. Ikawa, K. Ichii, A. Ito, R. O’oishi, T. Oota, G. Katata, A. Kotani, T. Sasai, A. Sato, H. Sato, A. Sugimoto, R. Suzuki, K. Tanaka, T. Nitta, M. Niwano, E. Burke, H. Park, S. Yamaguchi

    Seppyo   80 ( 2 )   159 - 174   2018.4

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    Language：Japanese   Publishing type：Research paper (scientific journal)  

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  • The effect of high dust amount on the surface temperature during the Last Glacial Maximum: A modelling study using MIROC-ESM Reviewed

    Rumi Ohgaito, Ayako Abe-Ouchi, Ryouta O'ishi, Toshihiko Takemura, Akinori Ito, Tomohiro Hajima, Shingo Watanabe, Michio Kawamiya

    Climate of the Past   14 ( 11 )   1565 - 1581   2018.2

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.5194/cp-2018-2

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  • Dependence of the Onset of the Runaway Greenhouse Effect on the Latitudinal Surface Water Distribution of Earth-Like Planets Reviewed

    T. Kodama, A. Nitta, H. Genda, Y. Takao, R. O'ishi, A. Abe-Ouchi, Y. Abe

    Journal of Geophysical Research: Planets   123 ( 2 )   559 - 574   2018.2

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Blackwell Publishing Ltd  

    DOI： 10.1002/2017JE005383

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  • A CENTURY-LONG GLOBAL OFFLINE SIMULATION TOWARD LAND SURFACE, SNOW, SOIL-MOISTURE MODEL INTERCOMPARISON PROJECT (LS3MIP) Reviewed

    Yukihiko ONUMA, Hyungjun KIM, Kei YOSHIMURA, Tomoko NITTA, Ryouta O’ISHI, Kumiko TAKATA

    Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering)   74 ( 5 )   I_43 - I_48   2018

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    Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

    DOI： 10.2208/jscejhe.74.5_i_43

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  • Ecological Niche and Least-Cost Path Analyses to Estimate Optimal Migration Routes of Initial Upper Palaeolithic Populations to Eurasia

    Yasuhisa Kondo, Katsuhiro Sano, Takayuki Omori, Ayako Abe-Ouchi, Wing-Le Chan, Seiji Kadowaki, Masaki Naganuma, Ryouta O’ishi, Takashi Oguchi, Yoshihiro Nishiaki, Minoru Yoneda

    The Middle and Upper Paleolithic Archeology of the Levant and Beyond   199 - 212   2018

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1007/978-981-10-6826-3_13

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  • Reconciliation of top-down and bottom-up CO 2 fluxes in Siberian larch forest Reviewed

    Kumiko Takata, Prabir K Patra, Ayumi Kotani, Junko Mori, Dmitry Belikov, Kazuhito Ichii, Tazu Saeki, Takeshi Ohta, Kazuyuki Saito, Masahito Ueyama, Akihiko Ito, Shamil Maksyutov, Shin Miyazaki, Eleanor J Burke, Alexander Ganshin, Yoshihiro Iijima, Takeshi Ise, Hirokazu Machiya, Trofim C Maximov, Yosuke Niwa, Ryo’ta O’ishi, Hotaek Park, Takahiro Sasai, Hisashi Sato, Shunsuke Tei, Ruslan Zhuravlev, Toshinobu Machida, Atsuko Sugimoto, Shuji Aoki

    Environmental Research Letters   12 ( 12 )   125012 - 125012   2017.12

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  • The GRENE-TEA model intercomparison project (GTMIP): overview and experiment protocol for Stage 1 Reviewed

    S. Miyazaki, K. Saito, J. Mori, T. Yamazaki, T. Ise, H. Arakida, T. Hajima, Y. Iijima, H. Machiya, T. Sueyoshi, H. Yabuki, E. J. Burke, M. Hosaka, K. Ichii, H. Ikawa, A. Ito, A. Kotani, Y. Matsuura, M. Niwano, T. Nitta, R. O'ishi, T. Ohta, H. Park, T. Sasai, A. Sato, H. Sato, A. Sugimoto, R. Suzuki, K. Tanaka, S. Yamaguchi, K. Yoshimura

    Geoscientific Model Development   8 ( 9 )   2841 - 2856   2015.9

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.5194/gmd-8-2841-2015

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  • Representing Variability in Subgrid Snow Cover and Snow Depth in a Global Land Model: Offline Validation Reviewed

    Nitta T, Yoshimura K, Takata K, O'ishi R, Sueyoshi T, Kanae S, Oki T, Abe-Ouchi A, Liston G. E

    JOURNAL OF CLIMATE   27 ( 9 )   3318 - 3330   2014.5

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1175/JCLI-D-13-00310.1

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  • Long term evolution of the glacial-interglacial cycle

    AbeOuchi Ayako, Takahashi Kunio, Saito Fuyuki, Oishi Ryouta, Kawamura Kenji

    Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research   2014   53 - 53   2014

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    Language：Japanese   Publisher：The Japanese Society of Snow and Ice / Japan Society for Snow Engineering  

    DOI： 10.14851/jcsir.2014.0_53

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  • 5. Response and Role of the Arctic and Antarctic in the Climatic System: The Past and the Future(Polar Regions: Key Regions for the Changing Climate (A Report on the Symposium of the 2011 Spring Assembly of the Meteorological Society of Japan)) Invited Reviewed

    ABE-OUCHI Ayako, SAITO Fuyuki, YOSHIMORI Masakazu, KOMURO Yoshiki, OISHI Ryuta, WATANABE Masahiro, OHGAITO Rumi, TAKAHASHI Kunio, SUZUKI Kazue, KAWAMURA Kenji, NOZAWA Toru

    Tenki   60 ( 11 )   901 - 908   2013.11

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    Language：Japanese   Publisher：Meteorological Society of Japan  

    J-GLOBAL

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  • The role of mineral-dust aerosols in polar temperature amplification Reviewed

    F. Lambert, J-S. Kug, R. J. Park, N. Mahowald, G. Winckler, A. Abe-Ouchi, R. O'ishi, T. Takemura, J-H. Lee

    NATURE CLIMATE CHANGE   3 ( 5 )   487 - 491   2013.5

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1038/NCLIMATE1785

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  • Influence of dynamic vegetation on climate change and terrestrial carbon storage in the Last Glacial Maximum Reviewed

    R. O'ishi, A. Abe-Ouchi

    CLIMATE OF THE PAST   9 ( 4 )   1571 - 1587   2013

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.5194/cp-9-1571-2013

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    Other Link： http://orcid.org/0000-0003-1745-5952

  • The variation of the Arctic cryosphere in the Last Millennium simulation using MIROC and MIROC-ESM

    Sueyoshi Tetsuo, Ohgaito Rumi, Yoshimori Masakazu, Hajima Tomohiro, Saito Fuyuki, Abe Manabu, Okajima Hideki, Oishi Ryouta, Watanabe Shingo, Abe Ayako, Kawamiya Michio

    Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research   2013   233   2013

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    Language：Japanese   Publisher：The Japanese Society of Snow and Ice / Japan Society for Snow Engineering  

    DOI： 10.14851/jcsir.2013.0_233

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  • Set-up of the PMIP3 paleoclimate experiments conducted using an Earth system model, MIROC-ESM Reviewed

    Sueyoshi T, Ohgaito R, Yamamoto A, Chikamoto M. O, Hajima T, Okajima H, Yoshimori M, Abe M, O'Ishi R, Saito F

    Geoscientific Model Development   6 ( 3 )   819 - 836   2013

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.5194/gmd-6-819-2013

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  • Perturbed physics ensemble using the MIROC5 coupled atmosphere-ocean GCM without flux corrections: experimental design and results Parametric uncertainty of climate sensitivity Reviewed

    Hideo Shiogama, Masahiro Watanabe, Masakazu Yoshimori, Tokuta Yokohata, Tomoo Ogura, James D. Annan, Julia C. Hargreaves, Manabu Abe, Youichi Kamae, Ryouta O'ishi, Rei Nobui, Seita Emori, Toru Nozawa, Ayako Abe-Ouchi, Masahide Kimoto

    CLIMATE DYNAMICS   39 ( 12 )   3041 - 3056   2012.12

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1007/s00382-012-1441-x

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  • Climate Sensitivity : Part 1: Concept and Current Understanding of Climate Feedbacks Reviewed

    YOSHIMORI Masakazu, YOKOHATA Tokuta, OGURA Tomoo, O'ISHI Ryouta, KAWAMIYA Michio, SHIOGAMA Hideo, TSUSHIMA Yoko, KODAMA Chihiro, NODA Akira T., CHIKIRA Minoru, TAKEMURA Toshihiko, SATOH Masaki, ABE-OUCHI Ayako, WATANABE Masahiro, KIMOTO Masahide

    59 ( 1 )   59, 5-22 - 22   2012

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  • Climate Sensitivity : Part 3: Verification from the Past Environment Reviewed

    YOSHIMORI Masakazu, YOKOHATA Tokuta, OGURA Tomoo, O'ISHI Ryouta, KAWAMIYA Michio, SHIOGAMA Hideo, TSUSHIMA Yoko, KODAMA Chihiro, NODA Akira T., CHIKIRA Minoru, TAKEMURA Toshihiko, SATOH Masaki, ABE-OUCHI Ayako, WATANABE Masahiro, KIMOTO Masahide

    59 ( 3 )   59, 143-150 - 150   2012

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  • REPRESENTATION OF SUBGRID SCALE SNOW COVER AND SNOW DEPTH VARIABILITIES IN A GLOBAL LAND MODEL Reviewed

    NITTA Tomoko, YOSHIMURA Kei, TAKATA Kumiko, O'ISHI Ryouta, KANAE Shinjiro, OKI Taikan

    Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering)   68 ( 4 )   第56巻,2012年2月 - I_330   2012

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    We incorporate a subgrid snow cover parameterization, Subgrid SNOW Distribution (SSNOWD) model, into the land surface model MATSIRO. SSNOWD assumes the subgrid snow water equivalent depth distribution following the lognormal distribution function, and accounts for the subgrid snow physical processes. The 29-year simulation is conducted forced by the observation and reanalysis based meteorological data. The results are compared with satellite based observational dataset and the intra- and inter-annual snow cover fraction variations are validated. The effects of incorporating SSNOWD on hydrological properties are also evaluated. The results show that SSNOWD improves the intra- and inter-annual variability of snow cover area in Northern Hemisphere especially in the accumulation season and the effect of those changes in snow cover on the other land surface properties are not negligible.

    DOI： 10.2208/jscejhe.68.I_325

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  • Climate Sensitivity : Part 2: Efforts toward Reducing Uncertainty Reviewed

    YOSHIMORI Masakazu, YOKOHATA Tokuta, OGURA Tomoo, O'ISHI Ryouta, KAWAMIYA Michio, SHIOGAMA Hideo, TSUSHIMA Yoko, KODAMA Chihiro, NODA Akira T., CHIKIRA Minoru, TAKEMURA Toshihiko, SATOH Masaki, ABE-OUCHI Ayako, WATANABE Masahiro, KIMOTO Masahide

    59 ( 2 )   59, 91-109 - 109   2012

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  • Polar amplification in the mid-Holocene derived from dynamical vegetation change with a GCM Reviewed

    R. O'ishi, A. Abe-Ouchi

    GEOPHYSICAL RESEARCH LETTERS   38 ( 14 )   38, L14702, doi: 10. - 1029/2011GL048001   2011.7

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1029/2011GL048001

    Web of Science

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  • Improvement of a snow scheme for the land surface model MATSIRO: offline validation using multiple dataset

    Nitta Tomoko, Yoshimura Kei, Takata Kumiko, O'ishi Ryouta, Kanae Shinjiro, Oki Taikan

    Proceeding of Annual Conference   24   119 - 119   2011

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    Language：Japanese   Publisher：THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES  

    DOI： 10.11520/jshwr.24.0.119.0

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  • Improved Climate Simulation by MIROC5. Mean States, Variability, and Climate Sensitivity Reviewed

    Masahiro Watanabe, Tatsuo Suzuki, Ryouta O'ishi, Yoshiki Komuro, Shingo Watanabe, Seita Emori, Toshihiko Takemura, Minoru Chikira, Tomoo Ogura, Miho Sekiguchi, Kumiko Takata, Dai Yamazaki, Tokuta Yokohata, Toru Nozawa, Hiroyasu Hasumi, Hiroaki Tatebe, Masahide Kimoto

    JOURNAL OF CLIMATE   23 ( 23 )   6312 - 6335   2010.12

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1175/2010JCLI3679.1

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  • Influence of dynamic vegetation on climate change arising from increasing CO2 Reviewed

    Ryouta O'ishi, Ayako Abe-Ouchi

    CLIMATE DYNAMICS   33 ( 5 )   645 - 663   2009.10

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1007/s00382-009-0611-y

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  • Vegetation dynamics and plant CO2 responses as positive feedbacks in a greenhouse world Reviewed

    Ryouta O'ishi, Ayako Abe-Ouchi, I. Colin Prentice, Stephen Sitch

    GEOPHYSICAL RESEARCH LETTERS   36 ( 11 )   36, L11706, doi:10. - 1029/2009GL038217   2009.6

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1029/2009GL038217

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  • 過去の気候変化と大気中二酸化炭素の自然変化に関するモデリング

    阿部 彩子, 大石 龍太, 近本 めぐみ, 岡 顕

    日本地球化学会年会要旨集   56   316 - 316   2009

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    Language：Japanese   Publisher：日本地球化学会  

    大気中二酸化炭素濃度は、氷期間氷期サイクル中で100ppm 近く変化したり 、 氷期中の数千年スケールの気候変化にともなって20ppm近く変化したり(Ahn et al. 2008)、さらに、過去１０００年の間でも１度につき10ppmほどの変化 が起きた、ということがわかってきた。二酸化炭素濃度が何によって引き起こ されたのか、また気候変化と二酸化炭素濃度の間のフィードバックの役割がど のようなものか、同定していくことは、将来の気候見通しの信頼性を得ていく ためにも重要と考えられるが、現状ではまだまだ理解が不足している。これら の気候と大気中二酸化炭素濃度の変化について、MIROC気候モデル、ダスト輸 送モデル、動的植生モデルおよび炭素循環モデルを用いて再現を試み、その変 化のしくみを調べるとりくみの現状について経過報告し課題を展望する。

    DOI： 10.14862/geochemproc.56.0.316.0

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    J-GLOBAL

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  • A simulation of the global distribution and radiative forcing of soil dust aerosols at the Last Glacial Maximum Reviewed

    T. Takemura, M. Egashira, K. Matsuzawa, H. Ichijo, R. O'ishi, A. Abe-Ouchi

    ATMOSPHERIC CHEMISTRY AND PHYSICS   9 ( 9 )   3061 - 3073   2009

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.5194/acp-9-3061-2009

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  • 大気海洋植生モデルの改良による緑のサハラ再現性の向上

    大石龍太, 阿部彩子, Wing-Le Chan

    日本気象学会2024年秋季大会  2024.11 

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    Event date： 2024.11

    Language：Japanese   Presentation type：Oral presentation (general)  

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  • PMIP4/CMIP6 last interglacial simulations using three different versions of MIROC: importance of vegetation

    O'ishi, R., Chan, W.-L., Abe-Ouchi, A., Sherriff-Tadano, S., Ohgaito, R., Yoshimori, M.

    東京大学大気海洋研究所共同利用研究集会「古気候研究におけるプロキシとモデルの融合: 温暖期の気候変動」  2023.3 

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    Event date： 2023.3

    Language：Japanese   Presentation type：Poster presentation  

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  • PMIP4/CMIP6 last interglacial simulations using three different versions of MIROC: importance of vegetation

    O'ishi, R., Chan, W.-L., Abe-Ouchi, A., Sherriff-Tadano, S., Ohgaito, R., Yoshimori, M.

    日本地球惑星科学連合2021年大会 

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    Event date： 2021.5 - 2021.6

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  • PMIP4/CMIP6 last interglacial simulations using three different versions of MIROC: importance of vegetation

    O'ishi, R., Chan, W.-L., Abe-Ouchi, A., Sherriff-Tadano, S., Ohgaito, R., Yoshimori, M.

    European Geosciences Union (EGU) General Assembly 2021 

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    Event date： 2021.4 - 2021.5

    Language：English  

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  • Estimation of Greenland surface mass balance using positive degree-days method and energy balance model

    O’ishi, R., Saito, F., Abe-Ouchi, A., Obase, T., Onuma, Y., Niwano, M.

    NIPR symposium 

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    Event date： 2020.12

    Language：English  

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  • PMIP4/CMIP6 last interglacial simulations using three different versions of MIROC: importance of vegetation

    O'ishi, R., Chan, W.-L., Abe-Ouchi, A., Sherriff-Tadano, S., Ohgaito, R., Yoshimori, M.

    Paleoclimate Modeling Intercomparison Project (PMIP) 2020 Nanjing Conference  2020 

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    Event date： 2020.10

    Language：English  

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  • How vegetation feedback for the future and the past (LIG) climate affects the Greenland ice sheet?

    The 15th Symposium on Polar Science  2024.12 

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    Event date： 2014.12 - 2024.12

    Language：English   Presentation type：Symposium, workshop panel (public)  

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  • The contribution of sub-grid snow distributions to climate change and polar amplification in a quadrupled CO2 world using a coupled GCM

    Ryouta O'ishi, Tomoko Nitta, Kumiko Takata, Tetsuo Sueyoshi, Glen E. Liston, Ayako Abe-Ouchi

    European Geosciences Union (EGU) General Assembly 2013 

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    Event date： 2013.4

    Language：English   Presentation type：Poster presentation  

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  • How vegetation change contribute to polar amplification in warm climate?,

    R. O’ishi, A. Abe-Ouchi

    The Third International Symposium on the Arctic Research (ISAR-3) 

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    Event date： 2013.1

    Presentation type：Oral presentation (general)  

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  • The variation of the Arctic cryosphere in the Last Millennium simulation using MIROC and MIROC-ESM

    Sueyoshi Tetsuo, Abe Ayako, Kawamiya Michio, Ohgaito Rumi, Yoshimori Masakazu, Hajima Tomohiro, Saito Fuyuki, Abe Manabu, Okajima Hideki, Oishi Ryouta, Watanabe Shingo

    JSSI & JSSE Joint Conference  2013  The Japanese Society of Snow and Ice / Japan Society for Snow Engineering

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    Event date： 2013

    Language：Japanese  

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  • Introduction of new land processes and its contribution to an atmosphere-ocean general circulation model

    R. O’ishi, T. Nitta, K. Takata, T. Sueyoshi, G. E. Liston, K. Yoshimura, A. Abe-Ouchi

    ISAR-4  2015 

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  • The contribution of sub-grid snow distributions to climate change and polar amplification in a quadrupled CO2 world using an AOGCM

    R. O’ishi, T. Nitta, K. Takata, T. Sueyoshi, G. E. Liston, A. Abe-Ouchi

    IUGG General Assembly 2015  2015 

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  • 大気海洋大循環モデルと陸域生態系モデルを用いた古植生分布再現とその不確実性評価

    大石 龍太, Wing-Le Chan, 阿部彩子

    日本地球惑星科学連合2014年大会  2014 

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  • Dependence of the Runaway Threshold on the Surface Water Distributions of Earth-like Planets,

    Akira Nitta, Yutaka Abe, Ryouta O’ ishi, Ayako Abe-Ouchi

    AGU Fall Meeting 2014  2014 

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  • The role of vegetation change upon polar amplification in warm climate by feedback analysis

    大石龍太, 吉森正和, 阿部彩子

    日本地球惑星科学連合2017年大会  2017 

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  • Preliminary Modelling of the vegatation-climate, wet area and past methane emission by a general circulation model and a dynamical global vegetation model

    大石龍太, 阿部彩子

    日本地球惑星科学連合2017年大会  2017 

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  • A combination of ecological niche models and cost surface analysis figures out routes and rapidity of the dispersal of early modern humans

    Y. Kondo, K. Sano, T. Omori, A. Abe-Ouchi, W.-L. Chan, S. Kadowaki, M. Naganuma, R. O’ishi, T. Oguchi, M. Yoneda, Y. Nishiaki

    INQUA 19  2015 

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  • Vegetation change in Europe during the Late Pleistocene dispersal of Modern Humans

    R. O’ishi, W.-L. Chan, A. Abe-Ouchi

    INQUA 19  2015 

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  • Regional last glacial climate synthesis for the Eastern Mediterranean

    S. P. Obrochta, Y. Yokyoyama, A. Abe-Ouchi, R. O’ishi, W.-L. Chan, H. Kawahata

    INQUA 19  2015 

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  • The modeling of mineral dust aerosol at the Last Glacial Maximum using MIROC-ESM and analyses on the feedbacks on the climate

    Ohgaito R., Abe-Ouchi A., Takemura T., Sueyoshi T., Watanabe S., O’ishi R., Hajima T., Okajima H., Saito F., Chikamoto M.O., Kawamiya M.

    INQUA 19  2015 

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  • 大気海洋大循環モデルと陸域生態系モデルを用いた古植生分布再現とその不確実性評価

    大石龍太, 陳永利, 阿部彩子

    科研費新学術「ネアンデルタールとサピエンス交替劇の真相：学習能力の進化に基づく実証的研究」第8回研究大会  2013 

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  • 最終氷期極大期における植生分布変化が気候と陸域炭素貯留に与える影響

    大石 龍太, 阿部彩子

    日本気象学会2013年秋季大会  2013 

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  • 最終間氷期のグリーンランド氷床と極域気温増幅：植生の役割

    阿部彩子, 大石龍太, 高橋 邦夫, 齋藤 冬樹

    日本地球惑星科学連合2014年大会  2014 

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  • MIROC および MIROC-ESM を用いた過去1000年シミュレーションにおける北極域雪氷圏の変動

    末吉 哲雄, 大垣内 るみ, 吉森 正和, 羽島 知洋, 阿部 学, 大石 龍太, 岡島 秀樹, 齋藤 冬樹, 渡邉 真吾, 河宮 未知生, 阿部 彩子

    日本地球惑星科学連合2014年大会  2014 

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  • 地球型惑星の地表水分布と暴走温室限界

    新田 光, 阿部 豊, 大石 龍太, 阿部 彩子

    日本地球惑星科学連合2014年大会  2014 

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  • MIROC-ESMをもちいた最終氷期最大期実験初期解析-ダストエアロゾル分布

    大垣内 るみ, 阿部 彩子, 竹村 俊彦, 末吉 哲雄, 渡邉 真吾, 羽島 知洋, 大石 龍太, 岡島 秀樹, 齋藤 冬樹, 近本 めぐみ, 河宮 未知生

    日本地球惑星科学連合2014年大会  2014 

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  • 北極陸域変動モデル相互比較プロジェクトの概要

    宮崎 真, 斉藤 和之, 山崎 剛, 伊勢 武史, 森 淳子, 荒木田 葉月, 羽島 知洋, 保坂 征宏, 飯島 慈裕, 伊藤 昭彦, 松浦 陽次郎, 庭野 匡思, 大石 龍太, 太田 岳史, 朴 昊澤, 佐藤 篤司, 末吉 哲雄, 杉本 敦子, 鈴木 力英, 山口 悟, 芳村 圭

    日本地球惑星科学連合2014年大会  2014 

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  • How vegetation change contribute to polar amplification in warm climate?

    R. O'ishi, A. Abe-Ouchi

    WCRP OSC  2011 

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  • How vegetation change contribute to polar amplification in warm climate?

    R. O'ishi, A. Abe-Ouchi

    3rd iLEAPS Science Conference  2011 

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  • MIROC-ESMを用いた過去1000年シミュレーションにおけるシベリア雪氷圏の変動

    末吉 哲雄, 大垣内 るみ, 吉森 正和, 羽島 知洋, 近本 めぐみ, 阿部 学, 岡島 秀樹, 齋藤 冬樹, 大石 龍太, 山本 彬友, 渡邉 真吾, 河宮 未知生, 阿部 彩子

    日本地球惑星科学連合2013年大会  2013 

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  • Modeling the climate of the Late Pleistocene: A general overview of results and comparisons with proxy-derived data

    Wing-Le Chan, Ayako Abe-Ouchi, Ryouta O'ishi, Kunio Takahashi

    日本地球惑星科学連合2013年大会  2013 

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  • 大気海洋大循環モデルと陸域生態系モデルを用いた古植生分布再現とその不確実性評価

    大石龍太, 陳永利, 阿部彩子

    科研費新学術「ネアンデルタールとサピエンス交替劇の真相：学習能力の進化に基づく実証的研究」第7回研究大会  2013 

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  • 4倍大気二酸化炭素時の温暖化と極域増幅に対するサブグリッド積雪分布の寄与

    大石 龍太, 新田友子, 高田久美子, 末吉哲, G. E. Liston, 阿部彩子

    日本地球惑星科学連合2013年大会  2013 

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  • How vegetation change contribute to polar amplification in warm climate?

    R. O'ishi, A. Abe-Ouchi

    3rd International Conference on Earth System Modelling  2012 

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  • A modeling study with a dynamical global vegetation model and last millennium GCM experiments to understand change of atmospheric CO2 level and terrestrial carbon storage during the last millennium

    R. O'ishi, A. Abe-Ouchi, Sandy Harrison, I. C. Prentice

    3rd International Conference on Earth System Modelling  2012 

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  • 温暖環境における植生変化がPolar-amplificationに及ぼす影響

    大石龍太, 阿部彩子

    日本気象学会2012年度秋季大会  2012 

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  • 人類進化理解のための過去１３万年の気候モデリング

    陳永利, 阿部彩子, 大石龍太, 高橋邦生

    日本地球惑星科学連合2012年大会  2012 

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  • Vegetation dynamics and plant CO2 responses as positive feedbacks in a greenhouse world

    R. O'ishi, A. Abe-Ouchi, I. C. Prentice, S. Sitch

    8th International NCCR Climate Summer School  2009 

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  • Polar amplification in the mid-Holocene derived from dynamical vegetation change

    R. O'ishi, A. Abe-Ouchi

    AIMES Open Science Conference  2010 

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  • Polar amplificationに対する植生変化の影響

    大石龍太, 阿部彩子

    日本地球惑星科学連合2011年大会  2011 

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  • Polar amplification in the mid-Holocene derived from dynamical vegetation change

    R. O'ishi, A. Abe-Ouchi

    PAGES regional workshop Japan  2010 

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  • Polar amplification in the mid-Holocene derived from dynamical vegetation change

    R. O'ishi, A. Abe-Ouchi

    European Geosciences Union (EGU) General Assembly 2010  2010 

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  • サブグリッド積雪被覆スキームの導入による大気大循環モデルMIROC5に対する影響

    大石龍太, 高田久美子, 末吉哲雄

    日本気象学会2010年度秋季大会  2010 

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  • Brief introduction of MIROC data and DIAS/CMIP3 server. First workshop on the TGR regional climate change study

    R. O'ishi, M. Kimoto

    JST-MOST  2010 

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  • Vegetation dynamics and plant CO2 responses as positive feedback in a greenhouse world

    R. O'ishi, A. Abe-Ouchi, S. Sitch, I.C. Prentice

    Workshop on Reducing the uncertainty in the prediction of global warming  2009 

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  • Polar amplification in the Holocene derived from vegetation change using anomaly procedure

    R. O'ishi, A. Abe-Ouchi

    PAGES 3rd Opend Science Meeting  2009 

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  • 大気海洋植生結合モデルMIROC-LPJを 用いた古気候・古植生の再現

    大石龍太, 阿部彩子

    日本地球惑星科学連合2011年大会  2011 

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  • 最終氷期極大期におけるエアロゾルの分布および気候影響に関するシミュレーション

    竹村俊彦, 江頭未央, 一條寛典, 大石龍太, 阿部彩子

    日本気象学会2008年度春季大会  2008 

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  • 動態植生-大気大循環結合モデルを用いて再現された完新世温暖期の Polar-amplification における植生分布変化の役割とバイアス補正手法の有効性

    大石龍太, 阿部彩子

    本気象学会2009年度秋季大会  2009 

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  • 大気大循環モデルの陸面スキームにおける葉面積指数予報の試み

    大石龍太, 伊藤昭彦, 加藤知道, 木本昌秀

    日本気象学会2008年度春季大会  2008 

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  • 陸成砂漠堆積物及び海洋生物記録からみる白亜紀温室地球の大気・海洋循環システム

    長谷川精, JiangXinsheng, 伊庭靖弘, 多田隆治, 菅沼悠介, 大石龍太, 阿部彩子

    日本地球惑星科学連合2008年大会  2008 

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  • 4倍大気CO2時の植生分布変化と施肥効果が大気と炭素収支に及ぼす影響

    大石龍太, 阿部彩子, S. Sitch, I. C. Prentice

    日本気象学会2008年度秋季大会  2008 

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    Presentation type：Oral presentation (general)  

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  • 植生フィードバックを含む大規模山岳効果によるモンスーンへの影響

    児嶋恵, 阿部彩子, 大石龍太

    日本気象学会2008年度春季大会  2008 

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    Presentation type：Oral presentation (general)  

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  • Dynamic vegetation enhances global warming and accelerates soil carbon decomposition

    R. O'ishi, A. Abe-Ouchi, S. Sitch, I.C. Prentice

    American Geoscience Union 2007 Fall Meeting  2007 

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    Presentation type：Oral presentation (general)  

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  • Dynamic vegetation enhances global warming and accelerates soil carbon decomposition

    R. O'ishi, A. Abe-Ouchi, S. Sitch, I.C. Prentice

    Second International Conference on Earth System Modelling  2007 

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  • 4倍大気CO2時の植生分布変化と施肥効果が大気と炭素収支に及ぼす影響

    大石龍太, 阿部彩子

    日本地球惑星科学連合2009年大会  2009 

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    Presentation type：Oral presentation (general)  

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  • Influence of dynamic vegetation change to climate and carbon storage in the Last glacial maximum and mid-Holocene using a GCM with dynamical vegetation based on LPJ-MIROC

    R. O'ishi, A. Abe-Ouchi

    American Geoscience Union 2009 Fall Meeting  2009 

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    Presentation type：Oral presentation (general)  

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  • 動態植生モデル導入による温暖化進行への影響

    大石龍太, 阿部彩子

    日本気象学会2006年度秋季大会  2006 

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    Presentation type：Oral presentation (general)  

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  • The role of dynamic vegetation and processes under the CO2 increase and global warming with a newly coupled LPJ-MIROC AGCM

    R. O'ishi, A. Abe-Ouchi

    University Allied Workshop 2006  2006 

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    Presentation type：Oral presentation (general)  

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  • Impacts of the vertical resolution on the representation and accuracy of the forecast fields

    K. Yamada, R. O'ishi

    The 5th international workshop on next generation climate models for advanced high performance computing facilities  2003 

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  • 最終氷期極大期における気候動態植生相互作用

    大石龍太, 阿部彩子

    日本気象学会2007年度春季大会  2007 

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    Presentation type：Oral presentation (general)  

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  • The role of dynamic vegetation and processes under the CO2 increase and global warming with a newly coupled LPJ-MIROC AGCM

    R. O'ishi, A. Abe-Ouchi

    2006 

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  • The role of Dynamical Vegetation processes under the CO2 increase and global warming with a newly coupled LPJ-MIROC AGCM

    R. O'ishi, A. Abe-Ouchi, S. Sitch, I. C. Prentice

    European Geosciences Union (EGU) General Assembly 2006  2006 

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    Presentation type：Oral presentation (general)  

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  • プロセスベースのグリーンランド氷床融解量推定 ~氷床結合 GCM に向けて

    大石 龍太, 阿部彩子, 齋藤冬樹

    日本気象学会2018年秋季大会  2018 

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  • Seasonal feedback analysis on polar amplification in warm climate induced by orbit/CO2 with vegetation change

    INTERNATIONAL SYMPOSIUM ON CRYOSPHERE AND BIOSPHERE  2018 

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    Language：English  

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  • 植生フィードバック効果を導入した大気海洋大循環モデルを用いた最終間氷期の再現実験と古環境指標との比較

    大石龍太, 阿部彩子, 小長谷貴志

    日本地球惑星科学連合2018年大会  2018 

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  • Seasonal feedback analysis on polar amplification in warm climate induced by orbit/CO2 with vegetation change

    2018 

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  • 全球大循環モデルと動態植生モデルを用いた過去の気候・植生・メタン再現の初期的な研究

    大石 龍太, 阿部彩子

    日本気象学会2017年秋季大会  2017 

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  • PMIP4/CMIP6 Last Interglacial simulations using different versions of MIROC, with and without vegetation feedback

    O'ishi, R., Chan, W.-L., Abe-Ouchi, A., Sherriff-Tadano, S., Ohgaito, R., Yoshimori, M.

    日本地球惑星科学連合2020年大会  2020 

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  • Estimation of Greenland surface mass balance using positive degree-days method and energy balance model

    O’ishi R., Saito, F. Abe-Ouchi, A., Obase, T.

    日本地球惑星科学連合2020年大会  2020.6 

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  • Development of an Ice Sheet Model coupled General Circulation Model and application of Energy Balance Model on the estimation of Ice Sheet mass balance

    Ryouta O’ishi, Ayako Abe-Ouchi, Takashi Obase, Fuyuki Saito

    NORPAN closing workshop  2019 

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  • Development of an Ice Sheet Model coupled General Circulation Model and application of Energy Balance Model on the estimation of Ice Sheet mass balance

    Ryouta O’ishi, Ayako Abe-Ouchi, Takashi Obase, Fuyuki Saito

    日本地球惑星科学連合2019年大会  2019 

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Research Projects

  • Past climatic change and its influence on the Japanese society

    Grant number：20H01981  2020.4 - 2025.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

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    Grant amount：\17160000 （ Direct Cost: \13200000 、 Indirect Cost：\3960000 ）

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  • Comprehensive study on high-time resolution reconstruction of paleo-climate and its social impact assessment using sedimentary and coral samples around Japan

    Grant number：23K20242  2020.4 - 2025.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

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    Grant amount：\17160000 （ Direct Cost: \13200000 、 Indirect Cost：\3960000 ）

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  • 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

    Grant number：20H04327  2020.4 - 2024.3

    日本学術振興会  科学研究費助成事業  基盤研究(B)

    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

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    Grant amount：\17550000 （ Direct Cost: \13500000 、 Indirect Cost：\4050000 ）

    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。

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  • 大気海洋大循環モデルと陸域生態系モデルを用いた古植生分布再現とその不確実性評価

    Grant number：25101709  2013.4 - 2015.3

    日本学術振興会  科学研究費助成事業  新学術領域研究(研究領域提案型)

    大石 龍太

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    Grant amount：\3770000 （ Direct Cost: \2900000 、 Indirect Cost：\870000 ）

    本年度は、前年度に引き続き新学術研究「ネアンデルタールとサピエンス交替劇の真相: 学習能力の進化に基づく実証的研究」B02班が大気海洋大循環モデルMIROCで行った古気候実験の結果と、全球動的植生モデルLPJ-DGVMを用いて、過去3～6万年前の亜氷期亜間氷期サイクルが卓越した時代の植生分布の再現を取り扱った。大気海洋大循環モデル側の不備により前年度に大気海洋大循環モデルの再実験を行ったので、その結果を用いて亜氷期と亜間氷期の高解像度植生分布の再現実験を行った。得られた結果は、大陸規模では地質学的証拠と比較的よく整合する植生種の変動を示した。一般に、植生分布の変化は地表面状態の変化を通じて気候に影響を与えるが、B02班で用いられた大気海洋大循環モデルでは、この植生変化の効果は導入せずに亜氷期－亜間氷期の気候再現を行っている。本研究に示された植生の変化はヨーロッパ陸上に更なる気候変化をもたらす可能性が強い。代表者は既存の研究で大気海洋大循環モデルを改良し、植生分布の変化も大気・海洋と同時に整合的に予報可能として植生分布の気候影響を取り入れて一定の成果を挙げており、本研究でもそれを応用して、B02班で再現された亜氷期－亜間氷期の海水温を用いた実験を行った。その結果、相互作用する気候変化と植生変化が整合した亜氷期－亜間氷期植生が得られた。この植生分布の変化をB02班の実験に取り入れて再実験を行うことで、より正確な亜氷期－亜間氷期の再現を行うことができるため、その準備をした。

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  • Estimation of the Global distribution of sub-grid snow-cover ratio using a high resolution satellite data and its evaluation by a land surface model.

    Grant number：19612004  2007 - 2010

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    TAKATA Kumiko, GLEN E.Liston, HIRABAYASHI Yukiko, O'ISHI Ryota, SUEYOSHI Tetsuo

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    Grant amount：\4420000 （ Direct Cost: \3400000 、 Indirect Cost：\1020000 ）

    The global distribution of sub-grid snow cover ratio was estimated using two satellite observation data in visible radiation band : EASE-Grid data which covered long term period but limited for a medium resolution, and MODIS data which was limited to the recent years but enabled for a high resolution. In a land surface model for climate studies, MATSIRO, snow cover ratio had been estimated by a simple function of snow water equivalent. That was replaced by a scheme of snow cover ratio (SSNOWD) where the physics of the sub-grid distribution of snow cover was considered. It resulted in the significant reductions in negative biases in accumulation season and in positive biases in eastern Siberia.

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Social Activities

  • 最期のネアンデルタール人が遭遇した気候

    Role(s)： Appearance

    国際第四紀学連合第19大会  一般普及講演会 「第四紀年代学、古気候学、考古学が解き明かす人類真価史の真相－ネアンデルタールの消滅とホモサピエンスの拡散－」  2015.7

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    Type：Lecture

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