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Observational study of ocean structure and vertical mixing in the region east of the Philippines

Research Project

Project/Area Number 17K05660
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Meteorology/Physical oceanography/Hydrology
Research InstitutionJapan Agency for Marine-Earth Science and Technology

Principal Investigator

NAGANO Akira  国立研究開発法人海洋研究開発機構, 地球環境部門(海洋観測研究センター), 主任研究員 (40421888)

Co-Investigator(Kenkyū-buntansha) 長谷川 拓也  東北大学, 理学研究科, 客員研究者 (40466256)
Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2019: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2018: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2017: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Keywords西部熱帯太平洋 / ENSO / 準10年規模変動 / 黒潮 / 鉛直流 / フィリピン海 / 季節変動 / 経年変動 / AGEM法 / LADCP / AGEM / 海洋科学 / 海洋物理・陸水学
Outline of Final Research Achievements

The interannual variations of sea surface water in the Kuroshio Extension region, which possibly play a critical role in the climate change, originate in the region east of the Philippines. In order to reveal factors of the variations of distribution in heat and materials, we examined the spatiotemporal variations of their three-dimensional structures in the subsurface ocean. As a result, we found the region where vertical velocity is always upward. Furthermore, we revealed that the upward current varies on the quasi-decadal timescale with a maximum (minimum) the approximately one year after La Nina (El Nino).

Academic Significance and Societal Importance of the Research Achievements

北太平洋中緯度域の大気と海洋は,約10年の時間スケールで変化している(準10年規模変動).この変動のメカニズムの解明のためには,亜熱帯循環の内部領域の中層に潜り込んだ準10年規模の水温変動のシグナルがどこで海面に出現するのかを把握することが鍵となる.本研究の成果は,中層の水温の準10年規模変動がフィリピン東方海域で海面に出現していることを示唆する結果であり,準10年規模変動発生のメカニズムの解明に導く発見である.

Report

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

    (22 results)

All 2020 2019 2018 2017

All Journal Article (7 results) (of which Peer Reviewed: 7 results,  Open Access: 3 results) Presentation (15 results) (of which Int'l Joint Research: 7 results,  Invited: 2 results)

  • [Journal Article] Wind-driven decadal sea surface height and main pycnocline depth changes in the western subarctic North Pacific2019

    • Author(s)
      Nagano A, Wakita M
    • Journal Title

      Progress in Earth and Planetary Science

      Volume: 6 Issue: 1 Pages: 1-26

    • DOI

      10.1186/s40645-019-0303-0

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] El Nino-related sea surface elevation and ocean bottom pressure enhancement associated with the retreat of the Oyashio southeast of Hokkaido, Japan2019

    • Author(s)
      Hasegawa, T., A. Nagano, H. Matsumoto, K. Ariyoshi, and M. Wakita
    • Journal Title

      Marine Geophysical Research

      Volume: 40 Issue: 4 Pages: 505-512

    • DOI

      10.1007/s11001-019-09392-8

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Bottom pressure change associated with the 2004-2005 large meander of the Kuroshio south of Japan2018

    • Author(s)
      Akira Nagano, Takuya Hasegawa, Hiroyuki Matsumoto, Keisuke Ariyoshi
    • Journal Title

      Ocean Dynamics

      Volume: 68 Issue: 7 Pages: 847-865

    • DOI

      10.1007/s10236-018-1169-1

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] Characteristics of an atypical large-meander path of the Kuroshio current south of Japan formed in September 20172018

    • Author(s)
      Nagano Akira、Yamashita Yusuke、Hasegawa Takuya、Ariyoshi Keisuke、Matsumoto Hiroyuki、Shinohara Masanao
    • Journal Title

      Marine Geophysical Research

      Volume: なし Issue: 4 Pages: 1-15

    • DOI

      10.1007/s11001-018-9372-5

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Ocean-Atmosphere Observations in Philippine Sea by Moored Buoy2018

    • Author(s)
      Akira Nagano, Iwao Ueki, Takuya Hasegawa, Kentaro Ando
    • Journal Title

      2018 OCEANS - MTS/IEEE Kobe Techno-Oceans (OTO)

      Volume: なし Pages: 1-6

    • DOI

      10.1109/oceanskobe.2018.8558886

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] Monitoring the deep western boundary current in the western North Pacific by echo intensity measured with lowered acoustic Doppler current profiler2018

    • Author(s)
      Kanae Komaki, Akira Nagano
    • Journal Title

      Marine Geophysical Research

      Volume: 印刷中 Issue: 4 Pages: 1-9

    • DOI

      10.1007/s11001-018-9354-7

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] El Nino-Southern Oscillation-time scale covariation of sea surface salinity and freshwater flux in the western tropical and northern subtropical Pacific2017

    • Author(s)
      Nagano Akira、Hasegawa Takuya、Ueki Iwao、Ando Kentaro
    • Journal Title

      Geophysical Research Letters

      Volume: 44 Issue: 13 Pages: 6895-6903

    • DOI

      10.1002/2017gl073573

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Presentation] Variations in Water Properties and Current Velocity at Station K2 in the Western Subarctic North PaciCc in Relation to Wind Changes2020

    • Author(s)
      Akira Nagano, Masahide Wakita, Tetsuichi Fujiki
    • Organizer
      Ocean Sciences Meeting 2020
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] セイルドローンによる日本南岸黒潮大蛇行流路の横断観測2019

    • Author(s)
      永野 憲,安藤 健太郎
    • Organizer
      日本地球惑星科学連合2019年大会
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Presentation] Spatiotemporal Characteristics of Vertical Velocity in the Western Tropical Pacific Revealed by P-vector Method Applying to GEM-based Potential Density2019

    • Author(s)
      Akira Nagano, Takuya Hasegawa, Masahide Wakita
    • Organizer
      International Union of Geodesy and Geophysics 2019
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 北海道南東沖における親潮の後退に関係した海底圧力変動2019

    • Author(s)
      長谷川 拓也, 永野 憲, 松本 浩幸, 有吉 慶介, 脇田 昌英
    • Organizer
      日本地球惑星科学連合2019年大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Relationship between air-sea variations in the Philippine Sea and modulation of El Nino events2019

    • Author(s)
      Takuya Hasegawa, Akira Nagano, Iwao Ueki, Kentaro Ando
    • Organizer
      OceanObs'19
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 北海道南東岸沖における親潮の後退に関係した海底圧力変動とエルニーニョ発生の関係2019

    • Author(s)
      長谷川 拓也,永野 憲,松本 浩幸,有吉 慶介,脇田 昌英
    • Organizer
      大気海洋相互作用に関する研究集会(名古屋大学共同利用研究 )
    • Related Report
      2019 Annual Research Report
  • [Presentation] 係留ブイによる西部北太平洋暖水プール北縁の大気海洋観測(II)2019

    • Author(s)
      永野憲,植木巌,安藤健太郎,勝俣昌己,脇田昌英,長谷川拓也
    • Organizer
      ブルーアースサイエンス・テク2019
    • Related Report
      2018 Research-status Report
  • [Presentation] Atypical Large-meander Path of the Kuroshio South of Japan occurred in September 20172018

    • Author(s)
      Akira Nagano, Yusuke Yamashita, Keisuke Ariyoshi, Takuya Hasegawa, Masanao Shinohara
    • Organizer
      Asia Oceania Geosciences Society 15th Annual Meeting
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] 2017年9月に発生した日本南岸黒潮大蛇行に伴う海底圧力変動2018

    • Author(s)
      永野憲,山下 裕亮,長谷川 拓也,有吉 慶介,松本 浩幸,篠原 雅尚
    • Organizer
      日本海洋学会2018年度秋季大会
    • Related Report
      2018 Research-status Report
  • [Presentation] 2017年9月に日本南岸沖で形成された特異な黒潮大蛇行流路2018

    • Author(s)
      永野憲,山下 裕亮,有吉 慶介,長谷川 拓也,篠原 雅尚
    • Organizer
      日本地球惑星科学連合2018年大会
    • Related Report
      2018 Research-status Report
  • [Presentation] LADCPで計測した散乱強度による西部北太平洋の深層西岸境界流のモニタリング2018

    • Author(s)
      小牧加奈絵,永野憲
    • Organizer
      日本地球惑星科学連合2018年大会
    • Related Report
      2018 Research-status Report
  • [Presentation] Monitoring the deep western boundary current in the western North Pacific by lowered acoustic Doppler current profiler echo intensity2018

    • Author(s)
      Kanae Komaki, Akira Nagano
    • Organizer
      Asia Oceania Geosciences Society 15th Annual Meeting
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Relationship Between Ocean Bottom Pressure Changes and Oceanic Baroclinic Eddy off Kushiro-Tokachi During 2004-20132018

    • Author(s)
      Takuya Hasegawa, Akira Nagano, Hiroyuki Matsumoto, Keisuke Ariyoshi
    • Organizer
      Asia Oceania Geosciences Society 15th Annual Meeting
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 西部熱帯太平洋における大気海洋変動とエルニーニョ変調の関係2018

    • Author(s)
      長谷川拓也,永野憲,植木巌,安藤健太郎
    • Organizer
      日本海洋学会2018年度秋季大会
    • Related Report
      2018 Research-status Report
  • [Presentation] Barrier Layer at the Northern Edge of the Western North Pacific Warm Pool2018

    • Author(s)
      Akira Nagano、Hasegawa Takuya、Ueki Iwao、Ando Kentaro
    • 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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