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Mechanism of rapid sea surface temperature warming in the Kuroshio region and its impact on coastal environment

Research Project

Project/Area Number 19K03978
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 17020:Atmospheric and hydrospheric sciences-related
Research InstitutionJapan, Meteorological Research Institute

Principal Investigator

Usui Norihisa  気象庁気象研究所, 全球大気海洋研究部, 主任研究官 (50370333)

Co-Investigator(Kenkyū-buntansha) 広瀬 成章  気象庁気象研究所, 全球大気海洋研究部, 研究官 (20748074)
Project Period (FY) 2019-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2021: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2020: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2019: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Keywords黒潮 / 対馬暖流 / 水温上昇 / 大蛇行 / 東シナ海 / 日本海貯熱量 / 沿岸水位 / 急潮 / 黒潮続流 / 貯熱量 / 黒潮大蛇行 / 沿岸捕捉波 / 海面水温 / 表層水温 / 海面フラックス / 潜熱 / エントレインメント / 混合層熱収支 / 水温トレンド / 長期変動 / 海洋再解析 / 沿岸モデル / 暖水波及 / 海面水温上昇 / 熱輸送量 / 沿岸環境
Outline of Research at the Start

日本周辺の暖流域は過去100年間で全球平均の2~3倍のペースで海面水温が上昇している。この急激な海面水温の上昇は、近年の極端気象現象の発生や、沿岸域の海洋環境の変化に深刻な影響を及ぼしており、そのメカニズムの解明は喫緊の課題となっている。本研究では、高解像度の海洋再解析データ、及び、海洋モデル・同化システムを用いて、①黒潮及び対馬暖流の長期変化の実態を把握し、②暖流周辺海域で生じている急激な海面水温上昇のメカニズムを解明すると共に、③暖流の変化が沿岸域の海洋環境へ及ぼす影響について評価する。上記①~③を総合して、日本周辺で生じている急激な海面水温上昇の全容を明らかにする。

Outline of Final Research Achievements

Focusing on variations and interrelationships of the Kuroshio, its extension (KE), and the Tsushima Warm Current, and their effects on water temperature changes around Japan including coastal waters and marginal seas, the followings are clarified. (1) A remarkable warming trend of subsurface temperature over the East China Sea leads to enhanced latent heat release during summer. (2) The recent low Kuroshio transport results in the historical long-duration Kuroshio large meander in 2017. (3) The relationship between the Kuroshio and the past unusually high sea-level events at the south coast of Japan. (4) Synchronized variation mechanism of KE, Japanese coastal sea level, Tsushima Warm Current, and the ocean heat content in the Japan Sea. (5) The mechanism of Kyucho events at Cape Muroto and the Echizen Coast, and its relationship with the Kuroshio and the Tsushima Warm Current, respectively.

Academic Significance and Societal Importance of the Research Achievements

東シナ海の亜表層水温の顕著な高温化と夏季潜熱放出の強化は、九州周辺の豪雨に寄与している可能性があり、気象予測や防災情報の高度化に資する。これまで個々に研究されてきた、黒潮、黒潮続流、対馬暖流を結びつけるメカニズムを提案し、日本沿岸水位も含めて3つの海流系を統合した新たな見方を提示した。歴史的長期間持続の黒潮大蛇行の長期化要因を明らかにした。高い再現性を有するデータ同化モデルを用いることで、これまで再現が困難であった、異常潮位や急潮現象を再現し、そのメカニズムを明らかにした。

Report

(5 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (26 results)

All 2022 2021 2020 2019

All Journal Article (4 results) (of which Peer Reviewed: 4 results,  Open Access: 2 results) Presentation (22 results) (of which Int'l Joint Research: 9 results,  Invited: 5 results)

  • [Journal Article] Superposition of coastal-trapped waves and Kuroshio warm water intrusions caused unusually high sea levels around the southern coasts of Japan in early September 19712022

    • Author(s)
      Hirose Nariaki、Usui Norihisa、Sakamoto Kei、Kohno Nadao、Yamanaka Goro
    • Journal Title

      Journal of Oceanography

      Volume: 78 Issue: 6 Pages: 475-493

    • DOI

      10.1007/s10872-022-00655-4

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Sea level variability along the Japanese coast forced by the Kuroshio and its extension2022

    • Author(s)
      Usui Norihisa、Ogawa Koji
    • Journal Title

      Journal of Oceanography

      Volume: 78 Issue: 6 Pages: 515-527

    • DOI

      10.1007/s10872-022-00657-2

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Unusually high sea level at the south coast of Japan in September 2011 induced by the Kuroshio2021

    • Author(s)
      Usui, N., K. Ogawa, K. Sakamoto, H. Tsujino, G. Yamanaka, T. Kuragano, and M. Kamachi
    • Journal Title

      Journal of Oceanography

      Volume: 77 Issue: 3 Pages: 447-461

    • DOI

      10.1007/s10872-020-00575-1

    • NAID

      40022579304

    • Related Report
      2021 Research-status Report 2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Development of a new operational system for monitoring and forecasting coastal and open ocean states around Japan2019

    • Author(s)
      Hirose, N., N. Usui, K. Sakamoto, H. Tsujino, G. Yamanaka, H. Nakano, S. Urakawa, T. Toyoda, Y. Fujii, and N. Kohno
    • Journal Title

      Ocean Dynamics

      Volume: 69 Issue: 11-12 Pages: 1333-1357

    • DOI

      10.1007/s10236-019-01306-x

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Presentation] A new method for estimating steric mean sea surface dynamic height in MOVE system combining in-situ profiles and sea level anomalies2022

    • Author(s)
      Hirose, N., N. Usui, and Y. Fujii
    • Organizer
      2022 Ocean Surface Topography Science Team (OSTST) meeting
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Why has the 2017 Kuroshio large meander lasted so long?2022

    • Author(s)
      Usui, N., N. Hirose, Y. Fujii, and N. Kohno
    • Organizer
      Ocean Sciences Meeting 2022
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] Mechanism of unusually high sea level around the southern coasts of Japan in early September 1971 revealed by coastal ocean assimilation system2022

    • Author(s)
      Hirose, N., N. Usui, K. Sakamoto, N. Nadao, and G. Yamanaka
    • Organizer
      Ocean Sciences Meeting 2022
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] Interdecadal changes of surface-to-subsurface temperature in the East China Sea2021

    • Author(s)
      Usui, N., and N. Hirose
    • Organizer
      International workshop for mid-latitude air-sea interaction: advancing predictive understanding of regional climate variability and change across timescales
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Progress in Kuroshio forecasting at JMA2021

    • Author(s)
      Usui, N.
    • Organizer
      East Asian Workshop on A Predicted Ocean
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 気象庁現業海況システムにおけるオホーツク海の海洋・海氷場のバイアス低減に向けた取り組み2021

    • Author(s)
      碓氷典久, 広瀬成章, 平原幹俊, 檜垣将和
    • Organizer
      研究集会 「縁辺海と外洋とを繋ぐ対馬暖流系の物理・化学・生物過程」
    • Related Report
      2021 Research-status Report
  • [Presentation] 2017年9月中旬の室戸岬東部で発生した急潮の要因について2021

    • Author(s)
      広瀬成章, 碓氷典久, 坂本圭, 中野英之, 高野洋雄, 山中吾郎
    • Organizer
      日本海洋学会2021年度秋季大会
    • Related Report
      2021 Research-status Report
  • [Presentation] 2017年9月の室戸岬東部の急潮の要因と予測不確実性について2021

    • Author(s)
      広瀬成章, 碓氷典久, 坂本圭, 中野英之, 高野洋雄, 山中吾郎
    • Organizer
      日本周辺海域の海況モニタリングと波浪計測に関する研究集会
    • Related Report
      2021 Research-status Report
  • [Presentation] 東シナ海海面水温と黒潮変動の関係2020

    • Author(s)
      碓氷典久, 広瀬成章
    • Organizer
      2020年度九州沖縄地区合同シンポジウム「南西諸島近海における大気・海洋・生態系」
    • Related Report
      2020 Research-status Report
  • [Presentation] 2km高解像度現業海況システムを用いた1971年9月異常潮位の再現実験とその要因2020

    • Author(s)
      広瀬成章, 碓氷典久, 坂本圭, 高野洋雄, 山中吾郎
    • Organizer
      日本海洋学会2020年度秋季大会
    • Related Report
      2020 Research-status Report
  • [Presentation] Japanese Coastal Ocean Monitoring and Forecasting System: system configuration and reanalysis experiment2020

    • Author(s)
      Usui, N., N. Hirose, K. Sakamoto, N. Kohno, and G. Yamanaka
    • Organizer
      OceanPredict 4th Data Assimilation Task Team Meeting
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Ocean circulation and Sea ice variability in the southern part of the Okhotsk Sea in a high-resolution ocean-ice assimilation model2020

    • Author(s)
      Usui, N., N. Hirose, K. Sakamoto, N. Kohno, and G. Yamanaka
    • Organizer
      The 35th International Symposium on Okhotsk Sea & Polar Oceans
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Development of regional high-resolution assimilation systems based on four-dimensional variational method at JMA/MRI2019

    • Author(s)
      Usui, N., N. Hirose, Y. Fujii, T. Toyoda, N. Kohno, T. Kuragano, and M. Kamachi
    • Organizer
      OceanPredict'19
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] FORA-WNP30 high-resolution ocean reanalysis for the western North Pacific2019

    • Author(s)
      Usui, N., N. Hirose, Y. Fujii, T. Toyoda, and Y. Takatsuki
    • Organizer
      OceanObs'19
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] 高解像度海洋データ同化システムの開発とそれを用いた観測システム評価2019

    • Author(s)
      碓氷典久
    • Organizer
      2019年度 名古屋大学宇宙地球環境研究所研究集会
    • Related Report
      2019 Research-status Report
    • Invited
  • [Presentation] 水産利用に資する高解像度海洋再解析データの作成2019

    • Author(s)
      碓氷典久
    • Organizer
      日本海洋学会2019年度秋季大会ナイトセッション「海洋・水産分野への利用に向けたデータ同化と衛星観測」
    • Related Report
      2019 Research-status Report
    • Invited
  • [Presentation] 高解像度海洋モデル・データ同化システムを用いた黒潮研究2019

    • Author(s)
      碓氷典久
    • Organizer
      日本海洋学会2019年度秋季大会シンポジウム「今後の黒潮と周辺海域の国際共同観測を考える」
    • Related Report
      2019 Research-status Report
    • Invited
  • [Presentation] 2017年黒潮大蛇行の長期予測2019

    • Author(s)
      碓氷典久, 広瀬成章, 坂本圭, 藤井陽介, 高野洋雄
    • Organizer
      JpGU meeting 2019
    • Related Report
      2019 Research-status Report
  • [Presentation] 2-km解像度データ同化モデルで再現された2017年黒潮大蛇行とその沿岸域への影響2019

    • Author(s)
      広瀬成章, 碓氷典久, 坂本圭, 山中吾郎, 高野洋雄
    • Organizer
      JpGU meeting 2019
    • Related Report
      2019 Research-status Report
  • [Presentation] 日本近海2km解像度海況データ同化システムを用いた10 年再解析2019

    • Author(s)
      広瀬成章, 碓氷典久, 坂本圭, 山中吾郎, 高野洋雄
    • Organizer
      研究集会「縁辺海と外洋とを繋ぐ対馬暖流系の物理・化学・生物過程」
    • Related Report
      2019 Research-status Report
  • [Presentation] 2km解像度沿岸海況システムで再現された急潮及び暖水波及2019

    • Author(s)
      広瀬成章, 碓氷典久, 坂本圭, 山中吾郎, 高野洋雄
    • Organizer
      日本海及び日本周辺海域における環境急変現象(急潮)のモニタリング、モデリング及びメカニズム解明に関する研究集会
    • Related Report
      2019 Research-status Report
  • [Presentation] 海洋短波レーダ等を用いた日向灘周辺における2km高解像度現業海況システムの検証2019

    • Author(s)
      広瀬成章, 碓氷典久, 坂本圭, 山中吾郎, 高野洋雄
    • Organizer
      海洋レーダを用いた海況監視システムの開発と応用
    • Related Report
      2019 Research-status Report

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

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