摘要
利用中尺度模式ＭＭ４对１９９１年７月５～６日的江淮梅雨锋暴雨过程进行了数值模拟。用模式输 出资料，根据湿位涡理论分析了这次暴雨过程中对流层低层的中尺度低涡及地面气旋发生发 展的原因。结果表明，在有利的等熵面形态下，具有较高湿位涡值的高层冷空气沿等熵面快 速向南下降的过程中绝对涡度增加，导致了气旋性涡旋的发展加强。
The mesoscale model MM4 was used to simulate the torrential rain associated with Meiyu front occurring in 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 has been investigated in terms of the potential vorticity principle.Th e results show that the favorable pattern of the moist isentropic surface and th e cold air slided down along the moist isentropic surface rapidly were the favora ble factors to increase the absolute vorticity,and to cause the cyclogenesis.
出处
《气象学报》
CSCD
北大核心
2001年第5期560-568,共9页
Acta Meteorologica Sinica
基金
国家自然科学基金项目49775259
40075009。
