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Analytical and Numerical Study on Intermediate-Geostrophic Eddies

Research Project

Project/Area Number 60540262
Research Category

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

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

Principal Investigator

YAMAGATA TOSHIO  Research Institute for Applied Mechanics, Kyushu University, 応用力学研究所, 助教授 (50091400)

Co-Investigator(Kenkyū-buntansha) MATSUURA TOMONORI  Faculty of Engineering, Ibaraki University, 工学部, 助手 (80165761)
UMATANI SHIN-ICHIRO  Research Institute for Applied Mechanics, Kyushu University, 応用力学研究所, 助手 (30112353)
Project Period (FY) 1985 – 1987
Project Status Completed (Fiscal Year 1987)
Budget Amount *help
¥2,500,000 (Direct Cost: ¥2,500,000)
Fiscal Year 1987: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1986: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1985: ¥1,000,000 (Direct Cost: ¥1,000,000)
KeywordsIG equation / QG equation / PG equation / GG equation / Gulf Stream Ring / Kuroshio Large Meander / OGCM / 山形-Flierl方程式 / 準地衡流の力学 / I-G力学 / P-G力学 / Q-G力学 / 暖水渦 / 冷水渦 / 一般地衡流方程式 / ロスビーの変形半径
Research Abstract

1. We have generalized the IG equation to the degree at which either total energy or potential enstrophy of a reduced-gravity shallow water fluid system is conserved in time. In particular, we have derived new evolution equation using a perturbatin technique and have applied the equation to the satellite observed motion of a cyclonic Gulf Stream ring. The result has shown a superiority of the present model to the traditional quasi-geostrophic model
2. We have discussed the bimodelity of the Kuroshio path south of Japan from a new viewpoint of direct interaction of current with coastal geometry. By solving the barotropic quasi-geostrophic equation with step-like coastal geometry, we have demostrated that the model Kuroshio can actually show the localized, bimodal behavior for a reasonable range of inlet current speed.
3. We have developed a very tractable nonlinear shallow water ocean model which conserves potential enstrophy.
4. We have succeeded in transplanting the GFDL general circulation model to RIAM/Kyushu University. The next step is to adapt the model for our future model studies.

Report

(2 results)
  • 1987 Final Research Report Summary
  • 1986 Annual Research Report
  • Research Products

    (15 results)

All Other

All Publications (15 results)

  • [Publications] 山形俊男: ながれ(日本流体力学会誌). 5. 169-170 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Toshio Yamagata: Tellus. 39A. 161-169 (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] 福田久: 気象研究ノート. 156. 49-69 (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Hisashi Hukuda: Tellus. 40A. (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Toshio Yamagata: J.Phys Oceanogr. 18. (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Toshio Yamagata: "Evolution of quasi-geostrophic eddies in planetary flu" Nagare. 5. 169-170 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Toshio Yamagata: "The Capture of current meander by coastal geometry with possible application to the Kuroshio Current." Tellus. 39A. 161-169 (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Hisashi Hukuda: "Nonlinear Rossby waves" Meteorology Research Note. 156. 49-69 (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Hisashi Hukuda: "A unified geostrophic equation with application to a cold core ring" Tellus. 40A. (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Toshio Yamagata: "Geometry - forced coherent structures as a model of the Kuroshio large meander" J. Phys. Oceanogr. 18. (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] 山形俊男: ながれ(日本流体力学会誌). 5. 169-170 (1986)

    • Related Report
      1986 Annual Research Report
  • [Publications] 山形俊男: 物性. (1987)

    • Related Report
      1986 Annual Research Report
  • [Publications] Toshio Yamagata: Tellus. (1987)

    • Related Report
      1986 Annual Research Report
  • [Publications] 福田久: 気象研究ノート. (1987)

    • Related Report
      1986 Annual Research Report
  • [Publications] Toshio Yamagata: J.Phys.Oceanogr.

    • Related Report
      1986 Annual Research Report

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Published: 1987-03-31   Modified: 2016-04-21  

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