2008年6月广西锋前暖区暴雨过程分析

利用常规观测资料、卫星TBB和NCEP再分析资料,对2008年6月8-13日持续性暖区暴雨的环流特征、影响系统及物理量变化进行了诊断分析,结果表明:本次暴雨过程是在高层200hPa出现环流型调整、500hPa贝加尔湖至新疆地区为弱阻高形势和地面锋面低槽的环境下产生的,主要影响系统有低层切变线和低涡;低空急流迅速建立、北抬,使低层风速辐合加强是产生锋前暖区暴雨的有利因素;广西的中尺度环境存在南北明显差异,可能是形成双雨带的主要原因;在切变线和低涡切变锋区上垂直运动结构有明显差异,低涡切变上低层辐合高层强辐散,上升运动更强烈;暴雨前相对湿度明显增大,湿层深厚,中高层相对湿度在降水减弱时率先出现下降趋势;水汽通量中心的出现与暴雨发生时段和暴雨落区较为对应;夏季风向北推进,华南地区发生经向风扰动,出现了季风涌,使南海的水汽和能量源源不断地传送到华南地区,为这次持续性暴雨提供有利条件。

Analysis on a Heavy Rain Process in a Warm Sector in Guangxi in June 2008

Circulation characteristics and influencing systems of a continuous rainstorm in a warm sector between June 8 th -13 th 2008 in Guangxi are studied by using the routine observational data,TBB and NCEP re-analysis data,.Results show that this rainstorm process was formed under a circulation adjustment at 200hPa and a weak block high over Baikal Lake-Xinjiang and a frontal trough at ground.The weather system included a low-1evel shear line and a low vortex.The wind speed convergence at low level strengthened ...