珠江三角洲重大与非重大灾害局地强风暴发生环境条件的差异  

DIFFERENCES BETWEEN DISASTROUS LOCAL STORMS AND NON-DISASTROUS LOCAL STORMS IN ZHUJIANG RIVER DELTA IN THE ENVIRONMENTAL CONDITIONS OF THEIR GENESIS

作　　者：王沛霖[1] 

机构地区：[1]中山大学大气科学系

出　　处：《热带海洋》1996年第3期30-35,共6页

基　　金：广东省自然科学基金

摘　　要：根据１９７６—１９８３年３—８月珠江三角洲０８：００—０８：００局地强风暴与重大灾害局地强风暴资料，以及广州０８：００探空资料，采用对比度分析方法研究了有和无重大灾害局地强风暴发生环境条件的差异。与非重大灾害局地强风暴相比，重大灾害局地强风暴是在低压辐合上升、层结不稳定和位势不稳定，低层高温高湿和大的环境风速（特别是中低层风速）等方面更有利的条件下形成的。环境风对重大灾害局地强风暴形成有重要影响的是风速，而不是垂直风速切变，后者与局地强风暴进一步发展成重大灾害局地强风暴没有机理上的联系。By use of data from severe local storms in Zhujiang River Delta and sounding data of Guangzhou from March to August of 1976-1983, differences are identified between disastrous and non-disastrous local storms in the environmental conditions of their genesis. It is found that the former occurs in more favorable conditions than the latter, in low pressure, unstable stratification and potentials, great wind velocity in the troposphere,high temperature and large humidity in the low level. The important effects of the environmental wind on the development of the severe local storm into a disastrous local storm lies in its wind velocity instead of its vertical wind velocity shear, which has no inevitable connection at all.

关 键 词：珠江三角洲 灾害 强风暴 环境条件 

分 类 号：P425.54[天文地球—大气科学及气象学]