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Implementation of prognostic cloud scheme for a regional spectral model
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1997
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Description:The purpose of this study is to develop a precipitation physics package for the NCEP RSM designed to improve the skill of precipitation forecasts. The package incorporates a prognostic grid-resolvable precipitation scheme and a subgrid scale precipitation parameterization scheme with a convective trigger that explicitly couples boundary layer and convective precipitation processes. In this paper, the implementation of a prognostic cloud scheme for the NCEP RSM is described. A subgrid scale precipitation parameterization scheme was described in our companion paper (Hong and Pan 1998). Dynamical processes such as advection and diffusion processes for liquid species are included. Eleven experiments are conducted with a grid spacing of approximately 25 km for a heavy rain case over United States during 15-17 May 1995. Special attention is given to the set-up of the prognostic grid-resolvable precipitation scheme on a spectral grid as well as the importance of dynamical processes on a mesoscale grid together with radiation feedback. Different prognostic cloud schemes, classified according to the number of predicted liquid species, are also compared.
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Content Notes:Song-You Hong, Hann-Ming Henry Juang and Qingyun Zhao.
"December 1997."
"This is an unreviewed manuscript, primarily intended for informal exchange of information among NMC staff members."
System requirements: Adobe Acrobat Reader.
Includes bibliographical references (pages 31-33).
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Rights Information:Public Domain
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