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Modeling the global ocean circulation and biogeochemical cycles in the glacial climate

Research Project

Project/Area Number 19H01963
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 17020:Atmospheric and hydrospheric sciences-related
Research InstitutionThe University of Tokyo

Principal Investigator

Oka Akira  東京大学, 大気海洋研究所, 准教授 (70396943)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥14,170,000 (Direct Cost: ¥10,900,000、Indirect Cost: ¥3,270,000)
Fiscal Year 2021: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2020: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2019: ¥5,590,000 (Direct Cost: ¥4,300,000、Indirect Cost: ¥1,290,000)
Keywords氷期気候変動 / 海洋大循環 / 海洋炭素循環 / 海洋物質循環
Outline of Research at the Start

現在とは大きく異なる気候状態であった氷期には、海洋大循環の変動によって大規模な気候変動が引き起こされていた。 その変動の仕組みを正確に理解することは、将来の気候変動を考える上でも重要である。本研究では、氷期おける海洋大循環についての再現シミュレーションを実施するとともに、海洋物質循環モデルを用いた古海洋データとの直接比較によりモデル結果の検証を行う。これまでにない精度で氷期の気候・海洋状態を再現することを通じて、氷期における海洋大循環・海洋物質循環の大規模変動メカニズムを具体的かつ定量的に理解することを目指す。

Outline of Final Research Achievements

During the glacial period, the climatic conditions were very different from those of today and large-scale climate change was caused by changes in the ocean general circulation. It is important to accurately understand the mechanism of these changes in order to consider future climate change. In this study, we will reproduce the ocean general circulation during the glacial period and validate the model results through direct comparison with paleoceanographic data using an ocean biogeochemical cycle model. By reproducing glacial climate and ocean conditions with unprecedented accuracy, we aim to gain a concrete and quantitative understanding of the mechanisms of large-scale changes in ocean general circulation and ocean material circulation during glacial periods.

Academic Significance and Societal Importance of the Research Achievements

海洋大循環は熱輸送および炭素循環に重要な役割を持ち、その変動は地球の気候に大きな影響を与える。実際に、現在とは大きく異なる気候状態であった氷期には、海洋大循環の変動によって(近年の観測機器によるデータのみからは知りえない)大規模な気候変動が引き起こされていたことがさまざまな古気候記録から明らかになってきた。その変動の仕組みを正確に理解することは、将来の気候変動を考える上でも重要である。本課題では、応募者らがこれまでに開発・改良を重ねてきたさまざまな数値モデルを組み合わせた研究を展開し、氷期における海洋大循環・海洋物質循環の大規模変動メカニズムを具体的かつ定量的に理解するための研究を実施した。

Report

(4 results)
  • 2022 Final Research Report ( PDF )
  • 2021 Annual Research Report
  • 2020 Annual Research Report
  • 2019 Annual Research Report
  • Research Products

    (48 results)

All 2022 2021 2020 2019

All Journal Article (12 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 11 results,  Open Access: 10 results) Presentation (36 results) (of which Int'l Joint Research: 9 results,  Invited: 3 results)

  • [Journal Article] Global simulation of dissolved 231Pa and 230Th in the ocean and the sedimentary 231Pa/230Th ratios with the ocean general circulation model COCO ver4.02022

    • Author(s)
      Sasaki Yusuke、Kobayashi Hidetaka、Oka Akira
    • Journal Title

      Geoscientific Model Development

      Volume: 15 Issue: 5 Pages: 2013-2033

    • DOI

      10.5194/gmd-15-2013-2022

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Hysteresis of the Glacial Atlantic Meridional Overturning Circulation Controlled by Thermal Feedbacks2021

    • Author(s)
      Ando Taigo、Oka Akira
    • Journal Title

      Geophysical Research Letters

      Volume: 48 Issue: 24

    • DOI

      10.1029/2021gl095809

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Glacial carbon cycle changes by Southern Ocean processes with sedimentary amplification2021

    • Author(s)
      Kobayashi Hidetaka、Oka Akira、Yamamoto Akitomo、Abe-Ouchi Ayako
    • Journal Title

      Science Advances

      Volume: 7 Issue: 35

    • DOI

      10.1126/sciadv.abg7723

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Glacial mode shift of the Atlantic meridional overturning circulation by warming over the Southern Ocean2021

    • Author(s)
      Oka Akira、Abe-Ouchi Ayako、Sherriff-Tadano Sam、Yokoyama Yusuke、Kawamura Kenji、Hasumi Hiroyasu
    • Journal Title

      Communications Earth and Environment

      Volume: 2 Issue: 1 Pages: 1-8

    • DOI

      10.1038/s43247-021-00226-3

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Does a difference in ice sheets between Marine Isotope Stages 3 and 5a affect the duration of stadials? Implications from hosing experiments2021

    • Author(s)
      Sherriff-Tadano Sam、Abe-Ouchi Ayako、Oka Akira、Mitsui Takahito、Saito Fuyuki
    • Journal Title

      Climate of the Past

      Volume: 17 Issue: 5 Pages: 1919-1936

    • DOI

      10.5194/cp-17-1919-2021

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] A First Intercomparison of the Simulated LGM Carbon Results Within PMIP‐Carbon: Role of the Ocean Boundary Conditions2021

    • Author(s)
      Lhardy F.、Bouttes N.、Roche D. M.、Abe‐Ouchi A.、Chase Z.、Crichton K. A.、Ilyina T.、Ivanovic R.、Jochum M.、Kageyama M.、Kobayashi H.、Liu B.、Menviel L.、Muglia J.、Nuterman R.、Oka A.、Vettoretti G.、Yamamoto A.
    • Journal Title

      Paleoceanography and Paleoclimatology

      Volume: 36 Issue: 10

    • DOI

      10.1029/2021pa004302

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Impact of mid-glacial ice sheets on deep ocean circulation and global climate2021

    • Author(s)
      S. Sherriff-Tadano, A. Abe-Ouchi, and A. Oka
    • Journal Title

      Climate of the Past

      Volume: 17 Pages: 95-110

    • DOI

      10.5194/cp-2020-75

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] cean carbon pump decomposition and its application to CMIP5 earth system model simulations2020

    • Author(s)
      A. Oka
    • Journal Title

      rogress in Earth and Planetary Science

      Volume: 7 Issue: 1 Pages: 1-17

    • DOI

      10.1186/s40645-020-00338-y

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Is there warming in the pipeline? A multi-model analysis of the Zero Emissions Commitment from CO22020

    • Author(s)
      AH MacDougall et al. [A.Oka listed in 21th author]
    • Journal Title

      Biogeosciences

      Volume: 17 Issue: 11 Pages: 2987-3016

    • DOI

      10.5194/bg-17-2987-2020

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] 西洋深層循環のモデリング (特集 海洋物理学の今)2020

    • Author(s)
      岡 顕
    • Journal Title

      ながれ(日本流体力学会誌)

      Volume: 39 Pages: 270-275

    • Related Report
      2020 Annual Research Report
  • [Journal Article] Glacial CO2decrease and deep-water deoxygenation by iron fertilization from glaciogenic dust2019

    • Author(s)
      Yamamoto Akitomo、Abe-Ouchi Ayako、Ohgaito Rumi、Ito Akinori、Oka Akira
    • Journal Title

      Climate of the Past

      Volume: 15 Issue: 3 Pages: 981-996

    • DOI

      10.5194/cp-15-981-2019

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] CMIP5 model analysis of future changes in ocean net primary production focusing on differences among individual oceans and models2019

    • Author(s)
      Nakamura Yuki、Oka Akira
    • Journal Title

      Journal of Oceanography

      Volume: 75 Issue: 5 Pages: 441-462

    • DOI

      10.1007/s10872-019-00513-w

    • NAID

      40022010725

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Presentation] 最終氷期最盛期における海面境界条件の変化が大西洋子午面循環に与える影響の評価2022

    • Author(s)
      安藤 大悟、岡 顕
    • Organizer
      日本地球惑星科学連合
    • Related Report
      2021 Annual Research Report
    • Invited
  • [Presentation] 最終氷期最盛期における海面境界条件の変化が大西洋子午面循環に与える影響の評価2022

    • Author(s)
      安藤 大悟、岡 顕
    • Organizer
      日本海洋学会秋季大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Evaluation of the roles of surface flux changes in the Atlantic meridional overturning circulation during the last glacial maximum2022

    • Author(s)
      Ando, T., Oka, A.
    • Organizer
      14th International Conference on Paleoceanography, Bergen, Norway
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 氷期の海洋炭素循環変動に対する南大洋の物理的・生物地球化学的過程の影響2022

    • Author(s)
      小林英貴、岡顕、山本彬友、阿部彩子
    • Organizer
      日本地球惑星科学連合
    • Related Report
      2021 Annual Research Report
  • [Presentation] 最終退氷期における海洋炭素循環モデリング (2)2022

    • Author(s)
      小林英貴、岡顕、小長谷貴志、阿部彩子
    • Organizer
      日本地球惑星科学連合
    • Related Report
      2021 Annual Research Report
  • [Presentation] 最終退氷期における海洋炭素循環の過渡応答2022

    • Author(s)
      小林 英貴、岡 顕、小長谷 貴志、阿部 彩子
    • Organizer
      日本海洋学会秋季大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Glacial carbon cycle changes by Southern Ocean processes with sedimentary amplification2022

    • Author(s)
      Kobayashi, H., A. Oka, A. Yamamoto, and A. Abe-Ouchi
    • Organizer
      14th International Conference on Paleoceanography, Bergen, Norway
    • Related Report
      2021 Annual Research Report
  • [Presentation] Modeling the ocean carbon cycle during the last deglaciation2021

    • Author(s)
      H. Kobayashi, A. Oka, A. Yamamoto, A. Abe-Ouchi
    • Organizer
      日本地球惑星科学連合
    • Related Report
      2021 Annual Research Report
  • [Presentation] 南大洋の塩分成層の強化と鉄肥沃化が氷期の海洋化学トレーサー分布に及ぼす影響2021

    • Author(s)
      小林英貴、岡顕、山本彬友、阿部彩子
    • Organizer
      日本海洋学会秋季大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 氷期における海洋循環の定量的理解に向けた231Pa/230Th比の数値シミュレーション2021

    • Author(s)
      植木優、小林英貴、岡顕
    • Organizer
      日本海洋学会秋季大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 最終氷期最大期と現在における潮汐混合の変化に対する大西洋深層循環の応答(2)2021

    • Author(s)
      曽根田哲也、岡顕
    • Organizer
      日本海洋学会秋季大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Glacial ocean carbon cycle changes caused by enhanced stratification in the Southern Ocean and iron fertilization from glaciogenic dust2020

    • Author(s)
      H. Kobayashi, A. Oka, A. Yamamoto, A. Abe-Ouchi
    • Organizer
      日本地球惑星科学連合大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] A modeling study of early diagenesis using an ocean sediment model2020

    • Author(s)
      H. Kobayashi, A. Oka
    • Organizer
      日本地球惑星科学連合大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] lobal distribution of the ocean vertical diffusivity derived from an ocean tracer inverse model approach2020

    • Author(s)
      A. Oka
    • Organizer
      日本地球惑星科学連合大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 海洋大循環モデルを用いたLGMにおける潮汐混合の変化が大西洋子午面循環に及ぼす影響の見積もり2020

    • Author(s)
      曽根田哲也、岡顕
    • Organizer
      日本地球惑星科学連合大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Bi-stable regime and mode transitions of the Atlantic Meridional Overturning Circulation in the glacial climate2020

    • Author(s)
      T. Ando, A. Oka
    • Organizer
      日本地球惑星科学連合大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 堆積過程の増幅を伴う南大洋の変化が氷期の海洋炭素循環に及ぼす影響2020

    • Author(s)
      小林英貴、岡 顕、山本彬友、阿部彩子
    • Organizer
      海洋学会秋季大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 最終氷期最大期と現在における潮汐混合の変化に対する大西洋子午面循環の応答2020

    • Author(s)
      曽根田哲也、岡顕
    • Organizer
      海洋学会秋季大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 海洋大循環モデルによる希土類元素濃度全球分布の再現2020

    • Author(s)
      岡 顕、小畑元、田副博文
    • Organizer
      海洋学会秋季大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 氷期気候における大西洋子午面循環のモード遷移メカニズム2020

    • Author(s)
      安藤大悟、岡顕
    • Organizer
      海洋学会秋季大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] lacial ocean carbon cycle changes caused by enhanced stratification in the Southern Ocean and iron fertilization from glaciogenic dust2020

    • Author(s)
      H. Kobayashi, A. Oka, A. Yamamoto, A. Abe-Ouchi
    • Organizer
      PMIP meeting
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] he role of thermal threshold of the Atlantic meridional overturning circulation in glacial abrupt climate changes2020

    • Author(s)
      Akira Oka, Sam Sheriff-Tadano, Ayako Abe-Ouchi, Yusuke Yokoyama, Kenji Kawamura, Hiroyasu Hasumi
    • Organizer
      PMIP meeting
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Simulation of global distribution of dissolved 231Pa and 230Th in the ocean and sediment 231Pa/230Th ratio by using an ocean general circulation model2020

    • Author(s)
      Y. Sasaki, H. Kobayashi, A.Oka
    • Organizer
      Ocean Science Meeting
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Response of atmospheric pCO2 to glacial changes in the Southern Ocean amplified by carbonate compensation2020

    • Author(s)
      H. Kobayashi and A. Oka
    • Organizer
      Ocean Science Meeting
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Inversion of the ocean vertical diffusivity from steady-state tracer distributions by using an adjoint method2019

    • Author(s)
      岡 顕
    • Organizer
      日本地球惑星科学連合大会
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Presentation] 氷期における大西洋深層循環の数値シミュレーション2019

    • Author(s)
      岡 顕
    • Organizer
      日本海洋学会秋季大会
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Presentation] Simulation of global distribution of dissolved 231Pa and 230Th in the ocean and sediment 231Pa/230Th ratio by using an ocean general circulation model2019

    • Author(s)
      Y. Sasaki, H. Kobayashi, A.Oka
    • Organizer
      日本地球惑星科学連合大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 鉛直拡散係数の成層依存性を考慮した海洋大循環モデルによる氷期海洋炭素循環シミュレーション2019

    • Author(s)
      H. Kobayashi and A. Oka
    • Organizer
      日本地球惑星科学連合大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 氷期大西洋深層循環における風応力および海面熱境界条件の役割2019

    • Author(s)
      岡 顕、外川一記
    • Organizer
      日本地球惑星科学連合大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] CMIP5モデル結果解析による地球温暖化が海洋基礎生産に与える影響の定量的評価2019

    • Author(s)
      岡 顕、中村有希
    • Organizer
      日本地球惑星科学連合大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 簡易気候モデルを用いた氷期気候における大西洋深層循環の変動に関する研究2019

    • Author(s)
      安藤大悟、岡 顕
    • Organizer
      日本地球惑星科学連合大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 簡易気候モデルを用いた現在気候および氷期気候における大西洋子午面循環の多重解構造の比較2019

    • Author(s)
      安藤大悟、岡 顕
    • Organizer
      日本海洋学会秋季大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Response of atmospheric pCO2 to glacial changes in the Southern Ocean amplified by carbonate compensation2019

    • Author(s)
      H. Kobayashi and A. Oka
    • Organizer
      European Geophysical Union
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] imulation of global distribution of dissolved 231Pa and 230Th in the ocean and sediment 231Pa/230Th ratio by using an ocean general circulation model2019

    • Author(s)
      Y. Sasaki, H. Kobayashi, A.Oka
    • Organizer
      13th International Conference on Paleoceanography
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Response of atmospheric pCO2 to glacial changes in the Southern Ocean amplified by carbonate compensation2019

    • Author(s)
      H. Kobayashi, A.Oka, and A.Abe-Ouchi
    • Organizer
      13th International Conference on Paleoceanography
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] A study on the variability of the deep ocean circulation during glacial climate with a climate model of intermediate complexity2019

    • Author(s)
      T. Ando, A. Oka, A. Abe-Ouchi
    • Organizer
      13th International Conference on Paleoceanography
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research

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Published: 2019-04-18   Modified: 2024-01-30  

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