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MAINTENANCE MECHANISM OF THE KUROSHIO FRONT

Research Project

Project/Area Number 04640421
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

ICHIKAWA Hiroshi  KAGOSHIMA UNIVERSITY FACULTY OF FISHERIES ASSOCIATE PROFESSOR, 水産学部, 助教授 (60128410)

Co-Investigator(Kenkyū-buntansha) OHNO Yuichi  THE COMUNICATIONS RESEARCH LABORATORY DEPARTMENT OF EARTH ENVIRONMENT OBSERVATIO, 地球環境計測部, 郵政技官
Project Period (FY) 1992 – 1993
Project Status Completed (Fiscal Year 1993)
Budget Amount *help
¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1993: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1992: ¥1,400,000 (Direct Cost: ¥1,400,000)
KeywordsKuroshio / Oceanic Front / Horizontal Convergence / HF Ocean Surface Radar / HFレーダ
Research Abstract

The objective of this two-year period project is to elucidate the maintenance mechanism of the oceanic front which is significant in the coastal side of the Kurosio. The spatial and temporal variation of current in the area of ca. 50 km x 20 km southwest of the Yakushima Island was measured by HF ocean surface radar every two hours during three mnonths from October to December of 1992. The daily meteorological data at the Yakushima Island from september 1 to December 31, the satellite infrared thermal image on December 24 obtained by NOAA/AVHRR, and temporal change of sea surface temperature measured by ferry liner running between Kagoshima and Naha every two days from September 1 to December 31 were utilized for examining the external conditions of the HF radar observation period in the long term and large scale variation. From the distributions of horizontal convergence and vertical component of vorticity at the sea surface and their temporal change from 17 to 23 of November, 1992, it was found that while the spatial distribution of horizontal convergence zone is largely affected by tidal current, convergence zone and divergence zone distribute alternatively to each other along the northern edge of the Kuroshio with spatial scale of 2 - 6 km. The 25-hour mean of convergence reaches up to 1.5 x 10^<-4> s^<-1>. The horizontal divergence dominates when the front is moving towards south and vice versa. It was confirmed by our observation that the frontal eddy plays an important role in the maintenance of the Kuroshio front, and found that the convergence zone does not exist as a long and narrow band along the Kuroshio, but convergence and divergence zones distribute alternatively to each other.

Report

(3 results)
  • 1993 Annual Research Report   Final Research Report Summary
  • 1992 Annual Research Report
  • Research Products

    (3 results)

All Other

All Publications (3 results)

  • [Publications] 市川洋: "東シナ海における黒潮流量の短周期変動" 海と空. 69. 135-148 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Hiroshi, Ichikawa: ""Short Period Variations of the Kuroshio Volume Transport in the East China Sea"" Umi to Sora (Sea and Sky). 69(3). 135-148 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] 市川,洋: "東シナ海における黒潮流量の短周期変動" 海と空. 69. 135-148 (1993)

    • Related Report
      1993 Annual Research Report

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Published: 1992-04-01   Modified: 2016-04-21  

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