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[B-5.4 Research on the Interaction Between the Cloud Systems and the Dynamical Processes Related to Climate Change]

[Contact Person]

Yukari N. Takayabu
Senior Researcher, Atmospheric Environment Division
National Institute for Environmental Studies
Environmental Agency
1 Onogawa, Tsukuba, Ibaraki, 305 Japan
Phone +81-298-51-6111(Ext.438), Fax +81-298-51-4732
Email yukari@nies.go.jp

[Total Budget for FY1991-1993]

23,965,000 Yen (FY1993 8,305,000 Yen)

[Abstract]

　In order to introduce a proper cloud and convective parameterization scheme into the Global Climate Model(GCM), this study is devoted to clarify the interaction processes between cumulus activity and large-scale atmosphere dynamics. Data analysis utilizing meteorological satellite data and numerical studies with GCM are performed.
　Primary results of this study are as follows: (1) We identified the theoretical equatorial wave modes in the tropical cloud fields and quantified the characteristic value of the atmospheric waves associated with the cloud activity. (2) We established a method for estimating large-scale distribution of cloud optical properties from satellite data. (3) We conducted numerical experiments and clarified some mechanisms which determine the climatological global precipitation distribution and its relation to the convective parameterization schemes.

[Key Words]

Cumulus convection Cumulus parameterization Equatorial waves, Cloud optical properties