条件性对称不稳定与梅雨锋暴雨

CONDITIONALLY SYMMETRIC INSTABILITY AND MEIYU-FRONT RAINGUSH

Based on the diagnostic analysis of a raingush event in the Meiyu period over the Changjiang-Huaihe basin, a study is conducted of possible mechanisms responsible for the formation of Meiyu front torrential rain, indicating that it occurs under the conditions of potential stability or neutral stratification and the mechanics causing convection may be either due to conditionally symmetric instability or to potential instability on the equi-M surface. Further, Frontogenetical secondary circulation and sub-synoptic cyclone are the important factors for the heavy rain as well.