夏季黔东南州局地暴雨与西太副高环流的关系

Relation of Summer Rainstorm and West Pacific Ocean Subtropical High Circulation in Southeast Part of Guizhou Province

通过对黔东南州1996—2005年夏季发生局地暴雨的主要影响系统、各种物理量场的特征、地形等的综合分析,得出9次局地暴雨都与西太平洋副热带高压位置变化密切相关,西太平洋副热带高压外围的SW气流均增强为急流,并输送大量水汽和不稳定能量,而且特别有利的地形的强化作用,造成黔东南暴雨的落区不同。根据暴雨的不同落区,将其归纳为四种类型,即西部型暴雨、南部型暴雨、中部型暴雨、东部型暴雨。但中、南部型暴雨还有中低层低涡切变线配合产生。

Through the generalized analysis of main impact systems, the various element field and the terrain characteristics of the local rainstorm in southeast Guizhou in summer of 1996-2005, the result show that, first, 9 time local rainstorm are closely related with the position change of west Pacific subtropical high （WPSTH）, and the southwest air flow of the SPSTH circulation turn into jet stream, which - transports the massive water vapor and the instability energy. And then the strengthened function of special advantageous terrain creates the local rainstorm. According to the rainstorm area, we have divided it into four kinds of types, namely west rainstorm, eastern rainstorm, south rainstorm and middle rainstorm, but the southern rainstorm and the middle rainstorm have the mid-and low-level low vortex shear line coordination.