作　　者： ;

机构地区： 中山大学

出　　处： 《热带气象学报》 1996年第1期60-64,共5页

摘　　要： 根据珠江三角洲１９７６—１９８３年３—５月逐日（０８—０８时）天气资料和广州０８时探空资料，采用对比度分析方法，研究了本地区春季龙卷发生的环境条件，并与非龙卷局地强风暴发生的环境条件作了比较，结果表明，龙卷发生的有利环境条件是对流层深厚气层中气压低、风速大、层结不稳定、低层高温高湿和中下层位势不稳定，定性上与局地强风暴的条件基本相同，其中对流层深厚气层中更强的低压辐合、更不稳定的层结和更大的水平动量是局地强风暴进一步发展而产生龙卷的主要条件。龙卷与垂直风速切变无明显的联系。 By use of observational data in Zhujiang River Delta and GuangZhou's sounding from March to May of 1976-1983, the environmental conditions of genesis of tornado are analysed and compared with that of nontornadic severe local storm. It is found that the favorable conditions for tornado genesis are low pressure and stability of stratification, strong winds in a deep layer of the tropephere and high temperatures and humidity in the low level, which are qualitatively similar to those for severe local storms and larger convergece of low pressure, instability in stratification,and horizontal momentum over deep tropospheric layers of them are primary conditions for the storms to further develop into tornadoes. The latter has no mechanism connection with wind shears in the vertical.

关 键 词： 强风暴 龙卷 环境条件 对比度 珠江三角洲

领　　域： [天文地球]