Parameterization of the shortwave radiative properties of water clouds for use in GCMs |
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| Authors: | L -S Xu G -T Zhang H -B Cheng |
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| Institution: | (1) Atmospheric Radiation and Satellite Remote Sensing Laboratory, Chengdu Meteorological College, Chengdu, Sichuan, China;(2) Institute of Atmospheric Physics, CAS, Beijing, China |
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| Abstract: | Summary The influence of the micro- and macrophysics of water clouds on the scattering and radiative properties of clouds is investigated using versatile cloud drop size distributions (DSDs) and Mie theory for single scattering and the delta-Eddington approximation for multiple scattering. A new parameterization scheme for the shortwave radiative properties of water clouds is presented. As for single- scattering properties, a new parameterization for cloud optical thickness ( ) is proposed. This is based upon the seperation of the dependence of on the total number of DSDs, the cloud thickness, and the liquid water content, combined with equivalent radius. The cloud bulk radiative properties, i.e., the flux reflectance, transmittance, and absorptance, are uniquely fitted by a dimensionless parameter (X) or the optical thickness. The parameterization is compared with other schemes. Finally, the features and potential use of the scheme are discussed.With 5 Figures |
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