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Axis, velocity and volume transport of the Kuroshio in the Tokara Strait

Research Project

Project/Area Number 02640319
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 気象・海洋・陸水学
Research InstitutionKagoshima University

Principal Investigator

MAEDA Akio  Kagoshima University, Ocean Civil Engineering, Professor, 工学部, 教授 (90013573)

Co-Investigator(Kenkyū-buntansha) YAMASHIRO Toru  Kagoshima University, Ocean Civil Engineering, Research Associate, 工学部, 助手 (20158174)
SAKURAI Masahito  Kagoshima University, Ocean Civil Engineering, Assistant Professor, 工学部, 講師 (10094145)
野島 通忠  鹿児島県庁, 林務水産部, 技師
Project Period (FY) 1990 – 1992
Project Status Completed (Fiscal Year 1992)
Budget Amount *help
¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 1992: ¥200,000 (Direct Cost: ¥200,000)
Fiscal Year 1991: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1990: ¥1,200,000 (Direct Cost: ¥1,200,000)
KeywordsNorth pacific climate system / Volume transport of the Kuroshio / Tokara Strait / Migration of the Kuroshio front / Sea level records / Satellite infrared image / A typical temperature showing the axis of the Kuroshio / Averaged position of the axis of the Kuroshio / 表面水温 / 検潮記録 / 黒潮流量 / 黒潮フロント / 赤外画像 / 黒潮流軸指標水温 / 黒潮 / フロント / 流量 / 流軸 / 潮汐周期 / 慣性振動 / 水温断面観測 / トカラ海峡 / 水位記録 / 水位差 / 水温フロント / 傾圧成分
Research Abstract

It is necessary for understanding North Pacific climate system to monitor volume and heat transports of the Kuroshio. The Tokara Strait is a convenient sea area for monitoring of the transports. Many phenomena which have different time and space scales contribute fluctuation of the volume transport estimated from fluctuation of a sea level slope. For an example, migration of the Kuroshio front in the strait will contribute the fluctuation. So, we described relations between the front migration and the transport fluctuation, vertical structure of the front and generation of the front migration, using satellite infrared image, sea level records and time series of sea surface temperature. From the analyses, we got following results. 1. Northward migration of the front which extends from the sea surface to about 200m deep and originates from tongues of the shelf water west of the Yakushima is accompanied by increase of the volume transport between the Nakanoshima and the Satamisaki. 2. The inflow into the Kagoshima bay and the Ohsumi Branch Current strengthen after about 4 days of the northward migration.
Although the front has been generally found between the Nakanoshima and the Yakushima, a major part of the volume transport of the Kuroshio is supposed to exist south of the Nakanoshima. This means that the axis of the Kuroshio will exist south of the island. So, we determined average position of the axis analyzing data of BT and GEK and measured subsurface velocity at a cite south of the Nakanoshima where the water depth is 750m. From the analysis and the measurement, we got following results. 3. A typical temperature showing the axis is 17.2゚C at 200m depth. The averaged position of the axis is near the Nakanoshima. The standard deviation of the position is *25km. 4. Velocity at 500 depth is higher than that at 300m deep and approximately parallel to isobaths.

Report

(4 results)
  • 1992 Annual Research Report   Final Research Report Summary
  • 1991 Annual Research Report
  • 1990 Annual Research Report
  • Research Products

    (22 results)

All Other

All Publications (22 results)

  • [Publications] Akio Maeda: "Application of Satellite In frared Image to Monitor Changes of the Kuroshio in the Tokara Strait" Proceeding of the Eighteenth International Symposium of Space Technology and Science. 2027-2031 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Akio Maeda: "Fluctuation in Volume Transport Distribution Accompained by the Kuroshio Migration" Jornal of Oceanography. 49. 231-245 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 山城 徹: "東シナ海における黒潮の流速変動" 海と空(海洋気象学会、).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 櫻井 仁人: "トカラ海峡における黒潮測流(I)" 1992年度日本海洋学会 春季大会講演要旨集. 50-51 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 前田 明夫: "定期船に装備したDCPによるトカラ海峡の黒潮流速断面観測" 1992年度日本海洋学会 秋季大会講演要旨集. 29-30 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 櫻井 仁人: "トカラ海峡における黒潮測流(II)" 1992年度日本海洋学会 秋季大会講演要旨集. 31-32 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 山城 徹: "トカラ海峡の中之島南沖における潮流" 1993年度日本海洋学会 春季大会講演要旨集.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Akio Maeda: "Application of Satellite Infrared Image to Monitor Changes of the Kuroshio in the Tokara Striate" Proceeding of the Eighteenth International Symposium of Space Technology and Science. 2027-2031 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Akio Maeda: "Fluctuation in Volume Transport Distribution Accompained by the Kuroshio Migration" Jornal of Oceanography. 49. 231-245 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Masahito Sakurai: "Direct Current Measurements of the Kuroshio in the Tokara Strait(I)" Spring meeting in 1992 of the Oceanographical Society of Japan. 50-51 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Akio Maeda: "Observation of Velocity Section of Kuroshio in Tokara Strait by DCP equiped to a Ferryboat" Autumun meeting in 1992 of the Oceanographical Society of Japan. 29-31 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Masahito Sakurai: "Direct Current Measurements of the Kuroshio in the Tokara Strait(II)" Autumun meeting in 1992 of the Oceanographical Society of Japan. 31-32 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Akio Maeda: "Application of Satellite In frared Image to Monitor Changes of the Kuroshio in the Tokara Strait" Proceeding of the Eighteenth International Symposium of Space Technology and Science. 2027-2031 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] Akio Maeda: "Fluctuation in Volume Transport Distribution Accompained by the Kuroshio Migration" Jornal of Oceanography. 49. 231-245 (1993)

    • Related Report
      1992 Annual Research Report
  • [Publications] 櫻井 仁人: "トカラ海峡における黒潮測流(I)" 1992年度日本海洋学会 春季大会講演要旨集. 50-51 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] 前田 明夫: "定期船に装備したDCPによるトカラ海峡の黒潮流速断面観測" 1992年度日本海洋学会 秋季大会講演要旨集. 29-30 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] 櫻井 仁人: "トカラ海峡における黒潮測流(II)" 1992年度日本海洋学会 秋季大会講演要旨集. 31-32 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] 前田 明夫,山城 徹,櫻井 仁人: "Fluctuation of transport of the Kuroshio in the Tokara Strait" 日本海洋学会誌.

    • Related Report
      1991 Annual Research Report
  • [Publications] 前田 明夫,山城 徹,植島 和樹,櫻井 仁人: "本州南方における表層混合層内の水温変動と流速変動" 日本海洋学会創立50周年記念大会講演要旨集. 53-54 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] 前田 明夫,山城 徹,櫻井 仁人,西 隆一郎: "トカラ海峡における黒潮のフロントの移動と水位変動" 1991年度 日本海洋学会春季大会講演要旨集. 325-326 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] 山城 徹,前田 明夫: "甑海峡における潮汐周期帯の流速変動の特徴" 1991年度 日本海洋学会春季大会講演要旨集. 213-214 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] 前田 明夫: "トカラ海峡における黒潮のフロントの移動と水位変動について" 日本海洋学会平成3年度春季大会.

    • Related Report
      1990 Annual Research Report

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Published: 1990-04-01   Modified: 2016-04-21  

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