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DEVELOPMENT OF MIDDLE ATMOSPHERE GENERAL CIRCULATION MODEL INCLUDING RADIATION PROCESSES

Research Project

Project/Area Number 05452079
Research Category

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

Allocation TypeSingle-year Grants
Research Field Meteorology/Physical oceanography/Hydrology
Research InstitutionKYUSHU UNIVERSITY

Principal Investigator

NIYAHARA Saburo  Kyushu University, Dept.of Earth and Planetary Sci., Prof., 理学部, 教授 (70037282)

Co-Investigator(Kenkyū-buntansha) MIYOSHI Yasunobu  Kyushu University, Dept.of Earth and Planetary Sci., Res.Associate, 理学部, 助手 (20243884)
NAKAJIMA Teruyuki  University of Tokyo, Center for Climate System Research, Prof., 気候システム研究センター, 教授 (60124608)
HIROOKA Toshihiko  Kyushu University, Dept.of Earth and Planetary Sci., A.Prof., 理学部, 助教授 (90253393)
Project Period (FY) 1993 – 1995
Project Status Completed (Fiscal Year 1995)
Budget Amount *help
¥6,000,000 (Direct Cost: ¥6,000,000)
Fiscal Year 1995: ¥1,600,000 (Direct Cost: ¥1,600,000)
Fiscal Year 1994: ¥1,600,000 (Direct Cost: ¥1,600,000)
Fiscal Year 1993: ¥2,800,000 (Direct Cost: ¥2,800,000)
KeywordsMiddle Atmosphere GCM / long wave radiation / ozone chemical transport / ozone hole / イオンドラッグ / ダイナモ磁場変動
Research Abstract

A radiation scheme developed at Center for Climate System and a rediation scheme developed by Fomichev were incorporated in a middle atmosphere general circulation model at Kyushu University.
The former scheme is able to treat the short wave and long wave radiations. Some test runs have been done using a tropospheric-lower stratospheric general circulation model, and it has been confirmed that the GCM can simulate a realistic circulation and temperature distribution.
Fomichev's scheme is a long wave radiation scheme treating the LTE and non-LTE radiation in the middle atmosphere. In this project, we have introduced this scheme to treat the long wave radiation in the middle atmosphere and lower thermosphere. The results show that zonal wind around the mesopause becomes strong by introducing the realistic radiation process. This means that we need stronger E-P flux divergence (convergence) to close the zonal wind around the mesopause.
An ozone chemical transport process was incorporated to the middle atmosphere GCM,and three dimensional ozone simulation has been conducted to investigate ozone variation in the middle atmosphere and resulting general circulation change. By making an artificial ozone hole in the Antarctic region, variations of temperature distribution and general circulation had been investigated. It is found that temperature decreases around the ozone hole, and it increases above the ozone reduction height. This result is consistent with observations. The temperature change is induced by the changes of the polar night jet, planetary wave activity, and the residual circulation induced by the ozone reduction.

Report

(4 results)
  • 1995 Annual Research Report   Final Research Report Summary
  • 1994 Annual Research Report
  • 1993 Annual Research Report
  • Research Products

    (9 results)

All Other

All Publications (9 results)

  • [Publications] E.M.P.EKANAYAKE: "Background Wind Effect on Propagation of Nonmigrating Diurnal Tides in the Middle Atmosphere" Jour.Atmos.Terr.Phys.(印刷中).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] E.M.P.EKANAYAKE: "Background Wind Effect on Propagation of Nonmigrating Diurnal Tides in the Middle Atmosphere" Jour.Atmos.Terr.Phys.(in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] E. M. P. EKANAYAKE, T. ASO, and S. MIYAHARA: "Background Wind Effect on Propagation of Nonmigrating Diurnal Tides in the Middle Atmosphere" Jour. Atmos. Terr. Phys.(印刷中).

    • Related Report
      1995 Annual Research Report
  • [Publications] S.Miyahara and J.Forbes: "Interactions between diurnal tides and gravity waves in the lower thermosphere" Jour.Atmos.Terr.Phys.56. 1365-1373 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] T.Hirooka,et al: "Long-term variations of stratospheric circulations;acomparison of mean fields in the 1980s with CIRAmodels" Jour.Atmos.Terr.Phys.56. 1041-1049 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] S.Miyahara et al.: "Dynamical coupling between the lower and upper atmosphere by tides and gravity waves" Jour.Atmos.Terr.Phys.55. 1039-1053 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] Y.Miyoshi and O.Morita: "Effects of physical process of H20 on the general circulation of the atmosphere" Jour.Meteor. Soc.Japan. 71. 529-544 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] S.Miyahara and J.Forbes: "Interactions between diurnal tides and gravity waves in the lower thermosphere" Jour.Atmos.Terr.Phys.(in press). (1994)

    • Related Report
      1993 Annual Research Report
  • [Publications] T.Hirooka et al: "Long-term variations of stratospheric circulations: a comparison of mean fields in the 1980s with CIRA-1986 models" Jour.Atmos.Terr Phys.(in press). (1994)

    • Related Report
      1993 Annual Research Report

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

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