摘要
选择了８例典型的东北冷涡暴雨过程和８例典型的东北冷涡弱降水过程进行了合成对比分析。发现暴雨类冷涡其暴雨主要出现在冷涡的发展阶段，而非暴雨类冷涡的降水主要发生在冷涡的成熟阶段；暴雨类冷涡与其南侧的副热带低值系统联系密切，非暴雨类冷涡的这一特点不甚明显；暴雨类冷涡的两个降水中心分别出现在系统东侧偏南和南侧偏东一些的地方，距系统中心大约３００－４００ｋｍ和７００—８００ｋｍ，这些区域处于低层辐合、高层辐散以及中低层涡度，水汽通量辐合以及θｓｅ锋生的高值区，同时也是冷涡中尺度活动比较频繁的地方。
cases of northeast cold vortex in China have been chosen,including 8 cases of storm rainfall (type A) and 8 cases of weak rainfall(type B). Their composite diagnoses of physical variables were also done. The results show: 1. In general, the storm rainfall events often take place in the developing stage of the cold vortex,and the weak rainfall occurs in its mature phase. 2. The type A maintains close links with the subtropical low-pressure systems,and this feature is not obvious in the type B. 3. The precipitation centers of the type A are situated in the southeast quadrant of the cold vortex. This rainfall area corresponds well with the high-value areas of low--level convergence, high-level divergence,and low level vorticity, moisture convergence and θse-frontogenesis.
出处
《气象》
CSCD
北大核心
1995年第3期7-10,共4页
Meteorological Monthly
关键词
暴雨
对比分析
冷涡
northeast cold vortex storm rainfall composite analysis contrast analysis of physical factors
