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Development of Kyushu University Atmosphere-Ocean General Circulation Model and Research of Climate

Research Project

Project/Area Number 63460045
Research Category

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

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

Principal Investigator

MIYAHARA Saburo (1990)  Kyushu University, Fac. Science, Associate Professor, 理学部, 助教授 (70037282)

瓜生 道也 (1988-1989)  九州大学, 理学部, 教授 (60037215)

Co-Investigator(Kenkyū-buntansha) KAMACHI Masafumi  Kyushu University, Research Institute for Applied Mechanics Research Associate, 応用力学研究所, 助手 (70169613)
UMATANI Shinichiro  Kyushu University, Research Institute for Applied Mechanics Research Associate, 応用力学研究所, 助手 (30112353)
YAMAGATA Toshio  Kyushu University, Research Institute for Applied Mechanics Associate Professor, 応用力学研究所, 助教授 (50091400)
TAKAHASHI Masaaki  Kyushu University, Fac. Science, Research Associate, 理学部, 助手 (70188051)
宮原 三郎  九州大学, 理学部, 助教授 (70037282)
Project Period (FY) 1988 – 1990
Project Status Completed (Fiscal Year 1990)
Budget Amount *help
¥6,000,000 (Direct Cost: ¥6,000,000)
Fiscal Year 1990: ¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1989: ¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1988: ¥1,900,000 (Direct Cost: ¥1,900,000)
KeywordsENSO / coupled ocean-atmosphere disturbance / El Nino / La Nina / oceanic heat content in western Pacific / intraseasonal oscillation / 西風バ-スト / エル・ニ-ニョ / 大気海洋結合優乱 / 季節内擾乱 / 西太平洋暖水 / エル・ニーニョ / 南方振動 / 西風バースト / 大気海洋結合モデル / 海洋熱容量
Research Abstract

The objective of this project is to develop the Kyushu University Atmosphere-Ocean general circulation model, and to investigate the short term climatic changes such as El nino and ENSO. The research of this project has been done by two different methods.
At first, in order to understand the theoretical background of the coupled ocean-atmosphere dynamics, a simplified atmosphere-ocean coupled model is constructed by using Anderson-McCreary type ocean model and Gill type atmosphere model. Several numerical simulations have been done to investigate the necessary condition for generating the Elnino. It is found that the high oceanic heat content in the westem Pacific and the westerly burst over the western Pacific are the necessary condition for the generation of the El nino. Some numerical integrations have also been done to simulate the ENSO cycle. The model used in these integrations consists of a limited ocean surrounded by lands imitating the Pacific Ocean. An external land heating we … More st of the Pacific is added to simulate the land heating associated with the monsoon. The repetitious generation of the coupled disturbance has nothing to do with the linear model of Hirst (1988) as well as off-equatorial Rossby waves. It is perfectly determined by the amplitude of the external land heating. The mass budget analysis demonstrates that the change of zonal wind direction in the western Pacific, which is due to relative importance between the external land heating and the heating associated with the previous coupled disturbance, modulates the oceanic heat content relevant to the origin of the following coupled disturbance. This mechanism gives the oscillation between two stable equilibria (La Nina and El Nino), which are very different from those described in Battisti (1988), Schopf and Suarez (1987), and Zebiak and Cane (1987). Despite lots of model limitations, the present results seem to be compatible with the recent analyses of the air-sea-land system in the western Pacific.
A numerical experiment has been performed using a coupled ocean-atmosphere model in order to examine possible relationships between the atmospheric intraseasonal oscillation and the air-sea coupled interannual disturbance. The model is composed of a T21 atmospheric general circulation model and a simple ocean model. When the ocean is kept motionless with a fixed SST, intraseasonal oscillation is reproduced in the atmosphere. When the ocean is replaced by the active one, the intraseasonal oscillation becomes rather sporadic both in space and time over the warm ocean region produced by the ocean-atmosphere interaction. The mean structure of this warm SST region is very similar to that obtained by the simple coupled ocean-atmosphere model. However, The coupled disturbance in this model has a multi-scale structure having both intraseasonal and interannual modes. Less

Report

(4 results)
  • 1990 Annual Research Report   Final Research Report Summary
  • 1989 Annual Research Report
  • 1988 Annual Research Report
  • Research Products

    (29 results)

All Other

All Publications (29 results)

  • [Publications] T.Yamagata and Y.Masumoto: "A simple oceanーatmosphere coupled model of the origin of a warm ENSO event" Phil.Trans.Roy.Soc.London. A329. 225-236 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Y.Masumoto and T.Yamagata: "The birth and evolution of an eastward propagating airーsea couplud disturbance in an aqua planet" Meteorol.Atmos.Phys.(1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Y.Masumoto and T.Yamagata: "On the origin of a warm ENSO in the western Pacific" Jour.Meteorol.Soc.Japan. (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 升本 順夫,山形 俊男: "大気海洋総合モデルを用いた典型的なENSOシミュレ-ション" 九州大学応用力学研究所所報. 66. 11-19 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 升本 順夫,山形 俊男: "基本風の大気海洋結合擾乱に及ぼす影響" 九州大学応用力学研究所所報. 68. 39-46 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 弁本 順夫: "季節変動を考慮したENSOシミュレ-ション" 月刊 海洋. 21. 497-501 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] T. Yamagata and Y. Masumoto: "A simple ocean-atmosphere coupled model of the origin of a warm ENSO event." Phil. Trans. R. Soc. London. A329. 225-236 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Y. Masumoto and T. Yamagata: "The birth and evolution of an eastward propagating air-sea coupled disturbance in an aqua planet." Meteorol. Atmos. Phys.(1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Y. Masumoto and T. Yamagata: "On the origin of a model warm ENSO in the western Pacific." J. Meteorol. Soc. Japan. (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Y. Masumoto and T. Yamagata: "A tipical ENSO simulation using a coupled ocean-atmosphere model. (in Japanese)" Bull. Res. Inst. Appl. Mech. Kyushu Univ.66. 11-19 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Y. Masumoto and T. Yamagata: "Effects of basic winds on an air-sea coupled distrbance. (in Japanese)" Bull. Res. Inst. Appl. Mech. Kyushu Univ.68. 39-46 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Y. Masumoto: "An Enso simulation under a seasonal change. (in Japanese)." Gekkan "Kaiyou". 21. 497-501 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] T.Yamagata and Y.Masumoto: "A simple oceanーatmosphere coupled model of the origin of a warm ENSO event" Phil.Trans.Roy.Soc.London. A329. 225-236 (1989)

    • Related Report
      1990 Annual Research Report
  • [Publications] Y.Masumoto and T.Yamagata: "The birth and evolution of an eastward propagating airーsea couplud disturbance in an agua planet" Meteorol.Atmos.Phys.in press. (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] Y.Masumoto and T.Yamagata: "On the origin of a warm ENSO in the western Pacific" Jour.Meteorol.Soc.Japan. in press. (1991)

    • Related Report
      1990 Annual Research Report
  • [Publications] 升本 順夫,山形 俊男: "大気海洋結合モデルを用いた典型的なENSOシミュレ-ション" 九州大学応用力学研究所所報. 66. 11-19 (1988)

    • Related Report
      1990 Annual Research Report
  • [Publications] 升本 順夫,山形 俊男: "基本風の大気海洋結合擾乱に及ぼす影響" 九州大学応用力学研究所所報. 68. 39-46 (1989)

    • Related Report
      1990 Annual Research Report
  • [Publications] 升本 順夫: "季節変動と考慮したENSOシミュレ-ション" 月刊海洋. 21. 497-501 (1989)

    • Related Report
      1990 Annual Research Report
  • [Publications] Y.Masumoto and T.Yamagata: "The birth and evolution of an eastward propagating air-sea coupled disturbance in an aqua-planet" Jour.Meteor.Atmos.Phys.(1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] Y.Masumoto and T.Yamagata: "On the origin of a model warm ENSO in the weatem Pacific" Jour.Climate. (1990)

    • Related Report
      1989 Annual Research Report
  • [Publications] D-H.Wu,T.Yamagata,Y.Masumoto and M.Uryu: "Intraseasonal and interannual disturbances simulated in a coupled ocean-atmosphere model" (1990)

    • Related Report
      1989 Annual Research Report
  • [Publications] T.Yamagata and Y.Masumoto: "A simple ocean-atmosphere coupled model of the origin of a wam ENSO event" Phil.Trans.R.Soc.Lond.A329. 225-236 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] S.Miyahara and Deng-Hua We: "Effects of solar tides on the zonal mean circulation in the lower thermosphere:solstice condition" Jour.Atmos.Terres.Phys.51. 635-647 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] 浅井冨雄,山形俊男: 学術月報. 41. 34-37 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] 升本順夫,山形俊男: 九州大学応用力学研究所所報. 66. 11-19 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] 升本順夫,山形俊男: 月刊海洋科学. (1989)

    • Related Report
      1988 Annual Research Report
  • [Publications] T.Yamagata;Y.Masumoto: Philosophical Transactions of Royal Society of London. (1989)

    • Related Report
      1988 Annual Research Report
  • [Publications] Y.Masumoto;T.Yamagata: Jour.Meteor.Atmos.Phys.(Special Issue on Monsoon Low Frequency Modes). (1989)

    • Related Report
      1988 Annual Research Report
  • [Publications] S.Miyahara;D.-H.Wu;H.Morooka: Journal of the Meteorological Society of Japan. 66. 783-789 (1988)

    • Related Report
      1988 Annual Research Report

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Published: 1988-04-01   Modified: 2016-04-21  

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