Diagnostic Studies of the Effect of Cumulus Convection on Large-Scale Environment

On the basis of discussion about various budget equations,the horizontal pattern and vertical profiles of apparent source and sink with direct and indirect methods over the Changjiang River basin during Mei-yu heavy rain are summarized. Although the results are different and difficult to compare for each case,region or data,but this is certainly followed by an important vertical transport process of subgrid-scale,which reflects the striking effect of cumulus convection on largescale environment.Thus,for any prognostic models of heavy rain over the midlatitutes,it is necesary to add the parameterization of subgrid-scale motion.

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