江淮暴雨期一次低涡切变线过程的降水特征分析

本文通过对１９９１年７月江淮特大暴雨期的一次低涡切变线过程进行热源和水汽汇的诊断，揭示了造成这次大范围洪灾的降水是大面积存在的强对流降水，加热区位于对流层中上部，而主要减湿区则位于对流层中下部，表现在视热源Ｑ１和视水汽汇Ｑ２的分布上出现了Ｑ１和Ｑ２的垂直积分形热非常相似，极值中心重合且大小近似相等。

Analyses of the Precipitation Characteristics of a Shear-line Vortex Process in the Yantze-Huai River during the Heavy Rain

A diagnosis of the heat source and moisture sink of a shear-line vortex process in the Yangtze-Huai area during the heavy rain of July 1991 is given here in this paper. It indicates that the heavy rain which caused the flood catastrophes was a strong convective precipitation in a large area. The heating layer was located in the upper part of the troposphere,though the drying (condensation ) layer was in the lower troposphere, the horizontal distribution of apparent heat source ( Q1 ) and apparent moisture sink ( Q2 ) were quite similar.Their extreme value centers lay at the same position with the approximately same values.