作　　者： ; ; ; ; ; ;

机构地区： 广东省气象台

出　　处： 《自然灾害学报》 2011年第1期68-77,共10页

摘　　要： 2010年5月中旬,广东省在一周之内连续遭受了两次区域性暴雨过程,其频次之高、雨量之多、强度之大为历史同期所少有。对这两次暴雨过程从水汽输送、动力结构、大气稳定度和雷达特征等方面进行了对比分析。结果表明:两次暴雨过程的环流形势及影响系统不同,水汽输送和辐合强弱与暴雨范围有密切关系,降水强度不但受大气不稳定度影响,动力触发更可能是引发强降水的关键因素;产生暴雨的飑线通过吸收合并其移动前方和沿近地层辐合带新生单体得以维持和发展,飑线上的HP型超级单体是产生降水峰值的主要载体。 It is seldom for Guangdong Province to suffer two rainstorm processes in a week in May,2010. Water va- por transportation, dynamic structure, atmospheric stability and radar feafure in the two rainstorm processes were analysed comparatively in this paper. The results show that the two processes happened with different circulation back-grounds. The range of rainstorms is interrelated to water vapor transportation and convergence in a certain de- gree. The dynamic trigger is key to cause rainstorm, while precipitation intensity is also under the influence of atmospheric unstability. The squall line resulting in rainstorm maintains and develops by absorbing and merging new cell occurring in front of it or along convergence belt near ground layer. The peak value of precipitation is formed primary by the HP super-cell in squall line.

关 键 词： 暴雨 雷达特征 水汽输送 华南

领　　域： [农业科学] [农业科学]