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Spatiotemporal variation of the halocline and its impact on biological production in the North Pacific

Research Project

Project/Area Number 18K03736
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 InstitutionHokkaido University

Principal Investigator

Ueno Hiromichi  北海道大学, 水産科学研究院, 准教授 (90421875)

Co-Investigator(Kenkyū-buntansha) 三寺 史夫  北海道大学, 低温科学研究所, 教授 (20360943)
Project Period (FY) 2018-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2020: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2019: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2018: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Keywords塩分躍層 / 成層構造 / 北太平洋亜寒帯海域 / ベーリング海 / 海面塩分 / 北太平洋
Outline of Final Research Achievements

A halocline is a layer containing a strong vertical salinity gradient. In the subarctic North Pacific, the permanent halocline depth and intensity distributions corresponded to those of winter mixed layer depth and sea surface salinity, respectively, implying that the permanent halocline forms in association with winter mixing throughout the subarctic North Pacific. We also found that stratification in early summer in the northern Bering Sea was significantly weaker in 2018 than in 2017. This result is consistent with the extremely low sea-ice extent present in the winter of 2017/2018. We further investigated the distribution and interannual variation in the winter halocline in the upper layers of the world ocean. A halocline was observed in the tropics, equatorward portions of subtropical regions, the subarctic North Pacific and Southern Ocean, but was absent in the central subtropics.

Academic Significance and Societal Importance of the Research Achievements

海洋は、大まかに「暖かくて密度の低い表層」と「冷たくて密度の高い中深層」の2層に分かれています。その2層を分ける層として水温が急激に下がる層(水温躍層)が存在しており、水温躍層の深さや強さは大気海洋相互作用や生物生産に重要な役割を果たしていることが知られています。しかし、海洋の密度は塩分の影響も受けており、特に高緯度域では塩分が深さとともに大きく増加する塩分躍層が存在しています。本研究では、広範囲にわたる塩分躍層の分布と形成メカニズムを初めて調べ、海域による違いを明らかにしました。

Report

(4 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (10 results)

All 2020 2019 2018

All Journal Article (2 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 2 results,  Open Access: 1 results) Presentation (8 results) (of which Int'l Joint Research: 5 results,  Invited: 1 results)

  • [Journal Article] Stratification in the northern Bering Sea in early summer of 2017 and 20182020

    • Author(s)
      Ueno, H., M. Komatsu, Z. Ji, R. Dobashi, M. Muramatsu, H. Abe, K. Imai, A. Ooki, and T. Hirawake
    • Journal Title

      Deep-Sea Research, Part II

      Volume: 181-182 Pages: 104820-104820

    • DOI

      10.1016/j.dsr2.2020.104820

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Spatial Distribution and Seasonality of Halocline Structures in the Subarctic North Pacific2020

    • Author(s)
      Katsura, S., H. Ueno, H. Mitsudera, S. Kouketsu
    • Journal Title

      Journal of Physical Oceanography

      Volume: 50 Issue: 1 Pages: 95-109

    • DOI

      10.1175/jpo-d-19-0133.1

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] 2017・2018年北部ベーリング海における成層強度の時空間変動とその要因2020

    • Author(s)
      (87)上野 洋路, 小松 瑞紀, 吉兆 千一, 土橋 稜, 村松 美幌, 阿部 泰人, 今井 圭理, 大木 淳之, 平譯 享
    • Organizer
      日本海洋学会秋季大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Global distribution and interannual variation of winter halocline2019

    • Author(s)
      Oda, M., H. Ueno, K. Yasui, H. Mitsudera
    • Organizer
      PICES 2019 Annual Meeting
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Spatio-temporal variation of anticyclonic eddies in the western subarctic North Pacific2018

    • Author(s)
      Hiromu Ishiyama, Isao Fujita, Hiromichi Ueno
    • Organizer
      PICES 2018 Annual Meeting
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] 全球における冬季塩分躍層の分布と年々変動2018

    • Author(s)
      小田正人,上野洋路,安井桂,三寺史夫
    • Organizer
      2018年度日本海洋学会秋季大会
    • Related Report
      2018 Research-status Report
  • [Presentation] Dynamical frontogenesis in the transitional regions between the subtropical and the subpolar gyres2018

    • Author(s)
      Humio Mitsudera
    • Organizer
      JpGU 2018
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Dynamics of Brazil/Malvinas confluence and its bifurcation in the Subtropical Front and the Subantarctic Front2018

    • Author(s)
      Humio Mitsudera
    • Organizer
      10th International Workshop on Modeling the Ocean. Santos Brazil
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] ブラジル・マルビナス合流域の亜 熱帯前線・亜寒帯前線への分岐の力学2018

    • Author(s)
      三寺史夫、東弓弦、Chou,Hung-Wei, 青木茂
    • Organizer
      2018年度日本海洋学会秋季大会
    • Related Report
      2018 Research-status Report
  • [Presentation] Formation and interannual variations of baroclinic quasi-stationary jets in the transitional domain between the subtropical and subarctic gyres in the western North Pacific2018

    • Author(s)
      Humio Mitsudera, Toru Miyama, Hajime Nishigaki, Takuya Nakanowatari, Hatsumi Nishikawa, Tomohiro Nakamura, Taku Wagawa, Ryo Furue, Yosuke Fujii, and Shin-Ichi Ito
    • Organizer
      PICES-2018 Annual Meeting
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research

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Published: 2018-04-23   Modified: 2022-01-27  

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