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Study on meridional modes focusing on the oceanic mixed layer variability

Research Project

Project/Area Number 17K14392
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Meteorology/Physical oceanography/Hydrology
Research InstitutionJapan Agency for Marine-Earth Science and Technology

Principal Investigator

Kataoka Takahito  国立研究開発法人海洋研究開発機構, 地球環境部門(環境変動予測研究センター), ポストドクトラル研究員 (00794786)

Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2019: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2018: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2017: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Keywords大気海洋相互作用 / 大気海洋結合フィードバック / 気候変動 / 熱帯 / 大西洋 / 南北モード / 南北モード現象 / 海洋混合層 / 理論モデル / 気候モデル / 熱帯大気海洋結合系 / 海洋物理・陸水学 / 気象学
Outline of Final Research Achievements

By conducting an eigenanalyses of simple linear air-sea coupled models, it is shown that three additional feedback processes are present when the variable oceanic mixed layer depth (MLD) is considered. The coupling of the variable MLD yields comparable or more than doubled growth rate of the well-known tropical air-sea coupled feedback called WES feedback.
It is likely that the proposed feedback processes operate during the climate variability in the tropical Atlantic because an anti-phase relationship between the sea surface temperature and MLD anomalies, a characteristic feature of the new feedbacks, is seen during the observed tropical Atlantic climate variability and that simulated in a state-of-the-art coupled climate model.

Academic Significance and Societal Importance of the Research Achievements

新たな大気海洋結合フィードバック過程の発見・理解は、気候モデルの改良や、ひいては気候変動予測の精度向上に貢献することが期待される。また、本家研究で明らかになった大気海洋結合フィードバックは、熱帯大西洋の気候変動現象の成長に寄与することが分かったが、太平洋やインド洋にも類似の気候変動現象が存在するため、これらのフィードバック過程は、その他の海盆においても重要な役割を果たすと考えられる。

Report

(4 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • Research Products

    (18 results)

All 2020 2019 2018

All Journal Article (4 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 4 results,  Open Access: 3 results) Presentation (14 results) (of which Int'l Joint Research: 12 results,  Invited: 1 results)

  • [Journal Article] Current and emerging developments in subseasonal to decadal prediction2020

    • Author(s)
      Merryfield, W. J., et al.
    • Journal Title

      Bulletin of the American Meteorological Society

      Volume: - Issue: 6 Pages: E869-E896

    • DOI

      10.1175/bams-d-19-0037.1

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Wind-Mixed layer-SST Feedbacks in a tropical air-sea coupled system: Application to the Atlantic2019

    • Author(s)
      Takahito Kataoka, Masahide Kimoto, Masahiro Watanabe, and Hiroaki Tatebe
    • Journal Title

      Journal of Climate

      Volume: 印刷中 Issue: 13 Pages: 3865-3881

    • DOI

      10.1175/jcli-d-18-0728.1

    • Related Report
      2019 Annual Research Report 2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] Description and basic evaluation of simulated mean state, internal variability, and climate sensitivity in MIROC62019

    • Author(s)
      Tatebe Hiroaki, et al.
    • Journal Title

      Geoscientific Model Development

      Volume: 12 Issue: 7 Pages: 2727-2765

    • DOI

      10.5194/gmd-12-2727-2019

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] On the Mechanisms of the Active 2018 Tropical Cyclone Season in the North Pacific2019

    • Author(s)
      Qian Y.、Murakami H.、Nakano M.、Hsu P.‐C.、Delworth T. L.、Kapnick S. B.、Ramaswamy V.、Mochizuki T.、Morioka Y.、Doi T.、Kataoka T.、Nasuno T.、Yoshida K.
    • Journal Title

      Geophysical Research Letters

      Volume: 46 Issue: 21 Pages: 12293-12302

    • DOI

      10.1029/2019gl084566

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] The role of heat, momentum, and freshwater fluxes in tropical meridional gradient variability2020

    • Author(s)
      Kataoka, T., T. Suzuki, H. Tatebe
    • Organizer
      Ocean Sciences Meeting 2020
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] The cross-equatorial gradient variability: The role of heat, momentum, and freshwater flux2019

    • Author(s)
      Kataoka, T.
    • Organizer
      Japan Geoscience Union meeting 2019
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Seasonal to multi-year climate predictability in a climate model MIROC62019

    • Author(s)
      Kataoka, T., H. Tatebe, H. Koyama, T. Mochizuki
    • Organizer
      Japan Geoscience Union meeting 2019
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Can Ningaloo Nino develop without ENSO?2019

    • Author(s)
      Kataoka, T., S. Masson, T. Izumo, T. Tozuka, and T. Yamagata
    • Organizer
      AMOS-ICTMO 2019
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Meridional gradient variability in a tropical air-sea coupled system: The role of heat, momentum, and freshwater fluxes2019

    • Author(s)
      Kataoka, T., T. Suzuki, H. Tatebe
    • Organizer
      27th International Union of Geodesy and Geophysics (IUGG) General Assembly
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 風-混合層-海面水温フィードバック2019

    • Author(s)
      片岡崇人、木本昌秀、渡部雅浩、建部洋晶
    • Organizer
      日本気象学会2019年度春季大会
    • Related Report
      2019 Annual Research Report 2018 Research-status Report
  • [Presentation] The cross-equatorial gradient variability: The role of heat, momentum, and freshwater flux2019

    • Author(s)
      Kataoka, T.
    • Organizer
      Japan Geoscience Union meeting 2019, Chiba, Japan
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Meridional gradient variability in a tropical air-sea coupled system: The role of heat, momentum, and freshwater fluxes2019

    • Author(s)
      Kataoka, T., T. Suzuki, H. Tatebe
    • Organizer
      27th IUGG General Assembly
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] On the Wind-Mixed layer-SST modes in the tropical Atlantic2018

    • Author(s)
      Kataoka, T., M. Kimoto, M. Watanabe, H. Tatebe
    • Organizer
      EGU General Assembly 2018
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] New Ocean-Atmosphere Coupled Feedback in the Tropical Atlantic: Wind-Mixed Layer-SST modes2018

    • Author(s)
      Kataoka, T., M. Kimoto, M. Watanabe, H. Tatebe
    • Organizer
      International Conferences on Subseasonal to Decadal Prediction
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Air-sea coupled feedbacks in the tropics: Wind-Mixed layer-SST modes2018

    • Author(s)
      Kataoka, T., M. Kimoto, M. Watanabe, H. Tatebe
    • Organizer
      Joint US-Japan Workshop on Climate Change and variability
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] 風-混合層-海面水温フィードバック2018

    • Author(s)
      片岡崇人、木本昌秀、渡部雅浩、建部洋晶
    • Organizer
      2018年度日本海洋学会秋季大会
    • Related Report
      2018 Research-status Report
  • [Presentation] On the Wind-Mixed layer-SST modes in the tropical Atlantic2018

    • Author(s)
      Takahito Kataoka, Masahide Kimoto, Masahiro Watanabe, and Hiroaki Tatebe
    • Organizer
      EGU General Assembly 2018
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Wind-Mixed layer-SST Modes in the Tropical Ocean-Atmosphere Coupled System: With Application to the Atlantic2018

    • Author(s)
      Takahito Kataoka, Masahide Kimoto, Masahiro Watanabe, and Hiroaki Tatebe
    • Organizer
      Ocean Sciences Meeting 2018
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research

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Published: 2017-04-28   Modified: 2021-02-19  

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