ISENTROPIC POTENTIAL VORTICITY ANALYSIS ON THE MESOSCALE CYCLONE DEVELOPMENT IN A TORRENTIAL RAIN PROCESS*

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    * Supported by the National Natural Science Foundation of China under the Projects No.49775259 and No.40075009.

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  • The mesoscale model MM4 is used to simulate the torrential rain associated with Meiyu front occurring 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 the potential vorticity principle.The results show that because of the favorable pattern of moist isentropic surface,the absolute vorticity increases when cold air with high moist potential vorticity value rapidly slides down southwards along the moist isentropic surface,and then causes the cyclonic vortex development.
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    沈阳化工大学材料科学与工程学院 沈阳 110142

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ISENTROPIC POTENTIAL VORTICITY ANALYSIS ON THE MESOSCALE CYCLONE DEVELOPMENT IN A TORRENTIAL RAIN PROCESS*

  • 1. Lanzhou Arid Meteorological Institute,Lanzhou 730020;
    Nanjing Institute of Meteorology,Nanjing 210044;
    Yunnan University,Kunming 650091
Funds: * Supported by the National Natural Science Foundation of China under the Projects No.49775259 and No.40075009.

Abstract: The mesoscale model MM4 is used to simulate the torrential rain associated with Meiyu front occurring 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 the potential vorticity principle.The results show that because of the favorable pattern of moist isentropic surface,the absolute vorticity increases when cold air with high moist potential vorticity value rapidly slides down southwards along the moist isentropic surface,and then causes the cyclonic vortex development.

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