一次带有雷电现象的冬季雪暴中尺度探测分析

对2009年11月9日北京市一次伴随雷电的局地暴雪过程的中小尺度特征进行了分析。采用了风廓线雷达资料、微波辐射计资料、自动气象站资料、多普勒天气雷达资料和卫星资料,对此次降雪的精细时空结构进行了分析,通过天气尺度及中小尺度分析,探讨了冬季对流产生的原因。结果表明:此次过程为华北回流天气过程,西南暖湿空气在低层冷空气之上产生高架对流和雷电天气,对流的触发机制是中空扰动。

Mesoscale Observation Analysis of a Winter Snowstorm with Thunder and Lightning in Beijing Area

A snowstorm accompanied with thunder and lightning on November 9, 2009 was analyzed from its small scale feature. Using observation data from wind profiler, microwave radiometer, automatic weather station, Doppler weather radar and satellite, the fine temporal and spatial structures of this snow case and the causes for the convection in winter were discussed. The results showed that this case is a typical return flow process in northern China. The elevated convection and lightning storms were generated with the warm and moist air from southwest above the lower cold air, and the triggering mechanism for the convection was the disturbance in the middle layer. The results of this case study will be instructive for the winter lightning forecast in snowstorm weather.