2008年6月汕头一次特大暴雨天气成因分析

Cause Analysis on a Heavy Rain Process in Shantou in June of 2008

利用常规资料、ncep 2.5°×2.5°6 h再分析资料和卫星云图资料对2008年6月13日～14日汕头地区一次特大暴雨天气过程成因进行了综合分析。结果表明:高低层环流配置为暴雨提供了有利的大尺度环流条件;高低空急流的相互作用是此次暴雨产生的重要原因;中尺度对流云团是此次特大暴雨的直接影响系统;低空急流为暴雨的发生发展提供充沛的水汽和不稳定能量;高低空正负涡度柱和正负散度柱的耦合是产生暴雨的动力机制。

The process cause of a heavy rainfall occurred in Shantou of Guangdong Province from June 13th to 14th ,2008 was analyzed by using the conventional data,2.5°×2.5° 6 h data from NECP and hourly satellite data. The results showed that the circulation configuration in lower and higher level formed a favorable large scale environment for rainstorm, and the important reason of the rainstorm occurring was the coupling of upper and lower tropospheric jet streams , and the mesoscale convective cloud cluster caused directly influenced the heavy rain, and lowlevel jet brought abundant vapor and instability energy for the heavy rainfall. Moreover, positive and negative vorticity columns appearing in high and low level, mutual coupling structure of divergence columns were the dynamic mechanisms for the heavy rainstorm occurrence.