• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Studies on Annual and Interannual Variations of Oceanic Thermal Domes

Research Project

Project/Area Number 03402015
Research Category

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

Allocation TypeSingle-year Grants
Research Field 気象・海洋・陸水学
Research InstitutionThe University of Tokyo

Principal Investigator

YAMAGATA Toshio  The University of Tokyo,Faculty of Science,Associate Professor, 理学部, 助教授 (50091400)

Co-Investigator(Kenkyū-buntansha) MASUMOTO Yukio  The University of Tokyo,Faculty of Science,Research Associate, 理学部, 助手 (60222436)
MIYATA Motoyasu  The University of Tokyo,Faculty of Science,Research Associate, 理学部, 助手 (50011648)
NAGATA Yutaka  The University of Tokyo,Faculty of Science,Professor, 理学部, 教授 (80011493)
馬谷 紳一郎  九州大学, 応用力学研究所, 助手 (30112353)
Project Period (FY) 1991 – 1992
Project Status Completed (Fiscal Year 1992)
Budget Amount *help
¥18,900,000 (Direct Cost: ¥18,900,000)
Fiscal Year 1992: ¥9,600,000 (Direct Cost: ¥9,600,000)
Fiscal Year 1991: ¥9,300,000 (Direct Cost: ¥9,300,000)
KeywordsOceanic thermal dome / Observation / Ocean general circulation model / Seasonal variation / Interannual variation / The Costa Rica Dome / The Guinea Dome / The Angola Dome / 熱フラックス / スル-・フロ- / ドリフタ-・ブイ / コスタ・リカ・ド-ム
Research Abstract

We studied both annual and interannual variations of oceanic thermal domes in the Pacific and the Atlantic. In particular, the Costa Rica Dome, the Mindanao Dome, the Angola Dome and the Guinea (Dakar) Dome are analysed in detail using several high-resolution ocean general circulation models. The Costa Rica Dome was also investigated utilizing the cruise of R/V Kaiyo-maru in January 1992. During the cruise both hydrographic (ADCP,XBT,CTD, water sampling) and meteorological observations were conducted. The following is the main outcome of the present research program. 1) We analyzed the model sensitivity to the surface heat and momentum fluxes and the effects of small islands using the Indo-Pacific model. It is found that the transport of low-latitude western boundary currents is much affected by those flux conditions. Also,even a small island can affect seriously surrounding oceanic conditions if it is located in strong currents. 2) An Indo-Pacific ocean model demonstrates that the sea … More sonal Costa Rica Dome cannot be generated well in some years like 1981 and 1983 because of lack of elements of formation due to basin-scale ocean-atmosphere variabilities. The model also shows an ability to capture several interesting synoptic events. For example, the Geosat altimetry data shows that an unusually strong anticyclone was generated in the Gulf of Tehuantepec in October, 1987 and then moved westward keeping its identity. The eddy was traced for a certain period by the EPOCS drifter 6858. This interesting event is clearly resolved in the model forced by the ECMWF winds but the simulated eddy strength (estimated by rotation speed and dynamic height anomaly) is one half of the observed one. This is mostly due the winds that are too weak, particularly in terms of the curl of the stress. 3) A general ocean circulation model for the Atlantic Ocean is used to analyze the seasonal variations in the Guinea Dome and Angola Dome regions. Model results are the following. The model Guinea Dome is cooled from June trough October due to active divergence of the heat transport, although the cooling rate is partly counteracted by the surface heating. The cooling is mostly related to the intensified positive curl of the local wind which converges into the ITCZ migrating northward during the boreal summer and fall. The coastal Guinea region experiences heating twice a year due to propagation of coastal downwelling Kelvin waves. The model Angola Dome is cooled from March through September. The horizontal divergence of the heat transport associated with the cold subsurface SECC(or SEUC) always tends to cool the Angola Dome. During the austral summer,however,the surface warming cancels the above current- induced cooling. The coastal Angola region is also much affected by the poleward propagation of the coastal downwelling Kelvin waves from the tropics twice a year. The generation of the downwelling Kelvin waves is due to the semiannual intensification of the westerly compone Less

Report

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

    (27 results)

All Other

All Publications (27 results)

  • [Publications] Shin-ichiro Umatani: "Response of the Eastern Tropical Pacific to Meridional Migration of the ITCZ:The Generation of the Costa Rica Dome." J.Rhys.Oceanogr.21. 346-363 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Yukio Masumoto: "Response of the Western Tropical Pacific to the Asian Winter Monsoon:The Generation of the Mindanao Dome." J.Phys.Oceanogr.21. 1386-1398 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 山形 俊男: "最近の地球温暖化を10年スケールの大気海洋結合現象." 混層流. 5. 212-223 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 山形 俊男: "大気と海洋の結合による10年スケールの気候変動." 科学. 61. 689-696 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Toshio Yamagata: "Interdecadal Natural Climate Variability in the Western Pacific and its Implication in Global Warming." J.Meteor.Soc.Japan. 70. 167-175 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 山形 俊男: "アジア・モンスーンとインドネシア海域の海流変動." 気象研究ノート. 176. 1-13 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 升本 順夫: "西部熱帯太平洋の季節変動." 月刊海洋″海洋大循環″. (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Yukio Masumoto: "Simulated Seasonal Circulation in the Indonesian Seas." J.Geophys.Res.,. (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] N.K.Vyas: "インドの夏のモンスーンについて" 月刊海洋. (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Toshio Yamagata: "Simulation of Tropical Thermal Domes in the Atlantic:A Seasonal Cycle." J.Phys.Oceanogr.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Toshio Yamagata: "Oceans,Climate,Man." The MIT Press, (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] S.Umatani and T.Yamagata: "Response of the Eastern Tropical Pacific to Meridional Migration of the ITCZ:The Generation of the Costa Rica Dome." J.Phys.Oceanogr. 21. 346-363 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Y.Masumoto and T.Yamagata: "Response of the Western Tropical Pacific to the Asian Winter Monsoon : The Generation of the Mindanao Dome." J.Phys.Oceanogr. 21. 1386-1398 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] T.Yamagata: "Asian Monsoon and Ocean Circulation in the West Pacific." In Oceanogr,Climate,Man.,The MIT Press. (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] T.Yamagata and Y.Masumoto: "Interdecadal Natural Climate Variability in the Western Pacific and is Implication in Global Warming." J.Meteor.Soc.Japan. 70. 167-175 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Y.Masumoto and T.Yamagata: "Simulated Seasonal Circulation in the Indonesian Seas." J.Geophys.Res. (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] T.Yamagata and S.Izuka: "Simulation of Tropical Thermal Domes in the Atlantic: A Seasonal Cycle." J.Phys.Oceanogr. (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Shin-ichiro Umatani: "Response of the Eastern Tropical Pacific to Meridional Migration of the ITCZ:The Generation of the Costa Rica Dome." J.Phys.Oceanogr.21. 346-363 (1991)

    • Related Report
      1992 Annual Research Report
  • [Publications] Yukio Masumoto: "Response of the Western Tropical Pacific to the Asian Winter Monsoon:The Generation of the Midanao Dome." J.Phys.Oceanogr.21. 1386-1398 (1991)

    • Related Report
      1992 Annual Research Report
  • [Publications] 山形 俊男: "最近の地球温暖化と10年スケールの大気海洋結合現象." 混層流. 5. 212-223 (1991)

    • Related Report
      1992 Annual Research Report
  • [Publications] 山形 俊男: "大気と海洋の結合による10年スケールの気候変動." 科学. 61. 689-696 (1991)

    • Related Report
      1992 Annual Research Report
  • [Publications] Toshio Yamagata: "Interdecadal Natural Climate Variability in the Western Pacific cnd its Implication in Global Warming." J.Meteor.Soc.Japan. 70. 167-175 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] 山形 俊男: "アジア・モンスーンとインドネシア海域の海流変動." 気象研究ノート. 176. 1-13 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] Toshio Yamagata: "Oceans,Climate,Man." The MIT Press, (1993)

    • Related Report
      1992 Annual Research Report
  • [Publications] Umatani,S and T.Yamagata: "Response of the eastern tropical pacific to meridional migration of the ITCZ:the generation of the Costa Rica Dome" J.Phys.Oceanogr.21. 346-363 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] Masumoto,Y and T.Yamagata: "Response of the western tropical Pacific to the Asian winter monsoon:the generation of the Mindanao Dome." J.Phys.Oceauogr.21. 1386-1398 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] Yamagata,T.and Y.Masumoto: "Interdecadal natural climate variability in the western Pacific and its implication in global warming" J.Meteo.Soc.Japan.

    • Related Report
      1991 Annual Research Report

URL: 

Published: 1991-04-01   Modified: 2016-04-21  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi