2002•气象学报：英文版Requires access
ISENTROPIC POTENTIAL VORTICITY ANALYSIS ON THE MESOSCALE CYCLONE DEVELOPMENT IN A TORRENTIAL RAIN PROCESS
李耀辉, 寿绍文, 范可
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Abstract
The mesoscale model MM4 is used to simulate the torrential rain associated with Meiyu frontoccurring on 5—6 July.1991 in the Changjiang-Huaihe Basin.Based on the outputs of the model,the cause of the mesoscale cyclogenesis on the lower troposphere is investigated in terms of thepotential vorticity principle.The results show that because of the favorable pattern of moistisentropic surface,the absolute vorticity increases when cold air with high moist potential vorticityvalue rapidly slides down southwards along the moist isentropic surface,and then causes thecyclonic vortex development.