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A Study on the Biomodal Path Dynamics of the Kuroshio South of Japan and Their Transformation Process between the Straight Path and the Large Meander Path.

Research Project

Project/Area Number 05640475
Research Category

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

Allocation TypeSingle-year Grants
Research Field Meteorology/Physical oceanography/Hydrology
Research InstitutionMie University

Principal Investigator

SEKINE Yoshihiko  Mie Univ, Faculty of Bioresources, Professor, 生物資源学部, 教授 (40211320)

Project Period (FY) 1993 – 1994
Project Status Completed (Fiscal Year 1994)
Budget Amount *help
¥1,600,000 (Direct Cost: ¥1,600,000)
Fiscal Year 1994: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1993: ¥900,000 (Direct Cost: ¥900,000)
KeywordsKuroshio / large meander / Cape Muroto / Kii Peninsula / separation / topographic effect / bimodal path / baroclinic instability / 西岸境界流 / 数値モデル / 地球流体力学 / 大冷水塊 / 海洋シミュレーション / 海流
Research Abstract

The bimodal path dynamics of the Kuroshio and their transformation process have been examined in the course of this study. In the first year, a flat bottom model with realistic coastal topographies south of Japan was assumed and the coastal topographic effect was examined. It has been pointed out that the transformation from straight path to large meander path is due to the positive vorticity supply from the Cape Muroto and Kii Penisula. Conversely, the transformation from the large meander path to the straight path is caused by no supply of the positive vorticity by the separated current path from the coastal topographies. In this second year, bottom topographies south of Japan is further included in the numerical model and their effects are examined. It is shown that the large meander path commonly separates from the Cape Muroto. If only the coastal topography of Kii Peninsula is excluded from the model, separation of the mean flow is carried out at the Cape Muroto. However, the sepa … More ration point shifts to east of the Cape Muroto, if the coastal topography of the Cape Muroto is excluded. If the coastal topographies of the Cape Muroto and Kii Peninsula are excluded, the separation point shifts further downstream. It is demonstrated that topographic effect of the Cape Muroto has an important influence on the bimodal path dynamics of the Kuroshio. Because of the stabilization effect of the bottom slope, large meander path is formed only in the case with large in- and outflow of 80 Sv and small eddy viscosity. It is suggested that the large meander path is formed through the baroclinic instability under the condition of strong nonlinear system. The two papers describing these results were accepted to La mer and they are now in printing. These results give important views for a future study on the Kuroshio. However, corresponding study on the observational data analyzes are still lacking. Then, I performed three sectional observations across the Kuroshio and I am now examining results of the observation. The topographic effect of Cape Muroto will be dicussed by use of the historical observational data. Less

Report

(3 results)
  • 1994 Annual Research Report   Final Research Report Summary
  • 1993 Annual Research Report
  • Research Products

    (23 results)

All Other

All Publications (23 results)

  • [Publications] Yoshihiko SEKINE: "Observation of Ocearic Structure around Tosa-Bae Southeast of Shikoku" Journal of Ocearography. 50. 543-558 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Yoshihiko SEKINE: "A Numerical Experiment on the Path Dynamics of the Kuroshio South of Japan. Part I Coastal Topographic Effect" La mer. 33(印刷中). (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Yoshihiko SEKINE: "A Numerical Experiment on the Path Dynamics of the Kuroshio South of Japan, Part II Bottom Topographic Effect" La mer. 33(印刷中). (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Yoshihiko SEKINE: "A Numerical Experiment on the Coastal Eeffect on the Western Boundary Current. Part I Effect of Inclined Coast Line" The Bulletin of the Faculty of Bioresoures, Mie University. 14号(印刷中). (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] 関根義彦: "研究者たちの海" 成山堂, 235 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] 関根義彦: "高知大学黒潮圏研究所編、黒潮と土佐" 高知新聞企業, 315 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Sekine, Y.: "Observation of oceanic structure around Tosa-Bae southeast of Shikoku.19GC01 : Journal of Oceanography" 50. 543-558 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Sekine, Y.: "A Numerical experiment on the path dynamics of the Kuroshio south of Japan. Part I Coastal topographic effect." La'mer. (in press). (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Sekine, Y.: "A numerical experiment on the path dynamics of the Kuroshio south of Japan. Part II Bottom topographic effect." La mer. (in press).(1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Sekine, Y.: "A Numerical Experiment on the coastal Effect on the Western boundary current. Part I Effect of inclined Coast Line." The Bulletin of Faculty of Bioresources, Mie University. (in press). (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Sekine Y.: Sea of researches. Seizando, 235 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Sekine Y.: The Black stream and Tosa. Kouch newspaper enterprise, 315 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Yoshihiko SEKINE: "Obseruation of Oceanic Structure around Tosa-Bae southeast of Shikoku" Journal of Oceanography. 50. 543-558 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] Yoshihiko SEKINE: "A numerical experiment on the path dynamics of the Kurashio south of Japan part I Coastal topographic effeft" La mer. 33(印刷中). (1995)

    • Related Report
      1994 Annual Research Report
  • [Publications] Yoshihiko SEKINE: "A numerical experiment on the path dynamics of the Kuroshio south of Japan part II Bottom topographic effect" La mer. 33(印刷中). (1995)

    • Related Report
      1994 Annual Research Report
  • [Publications] Yoshihiko SEKINE: "A numericd experiment on the coastal effect on the western boundary current.part I Effect of inclined coastline" The Bolletin of the Faculty of Bioresources Mie University. 14(印刷中). (1995)

    • Related Report
      1994 Annual Research Report
  • [Publications] 関根義彦: "研究者たちの海" 成山堂, 235 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] 関根義彦: "高知大学黒潮圏研究所編・黒潮と土佐" 高知新聞企業, 315 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] 関根義彦: "1975年を境としたグローバルな大気・海洋循環の変化" 海と空. 68. 211-220 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] 関根義彦: "日本南岸の黒潮流路の力学について" 海の研究. 2. 261-275 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] Yoshihiko SEKINE: "Topographic effect of a marine ridge on the spin-down of a cyclonic eddy with mean flow" Journal of Oceanography. 49. 593-606 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] Yoshihiko SEKINE: "Seasonal variation in volume transport of the Kuroshio south of Japan" Journal of Physical Oceanography. 24. 207-218 (1994)

    • Related Report
      1993 Annual Research Report
  • [Publications] Yoshihiko SEKINE: "Thermal structures in the Kuroshio Extention measured with towed thermistor chain." Journal of Oceanography. (in press).

    • Related Report
      1993 Annual Research Report

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Published: 1993-04-01   Modified: 2016-04-21  

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