黑龙江省两次强对流过程地闪特征的对比分析

Comparative analysis of cloud-to-ground lightning characters between two convective weather events in Heilongjiang Provice

利用地闪定位系统和多普勒雷达资料，对2007年6月4El和7月7日两次强对流天气过程的地闪演变特征进行了对比分析。结果表明：当强对流发展到最旺盛的时候，地闪强度和数量也达到最大值（地闪以负闪为主）；地闪主要发生在大于40dBz的区域或其邻近地带，稀疏的地闪通常发生在强回波外围10～30dBz的范围或其邻近区域。随着回波降水的开始，地闪强度也开始减弱；比较密集的地闪发生，通常预示着强对流天气的发生。一般在对流单体发展阶段，正闪在总地闪中的比例相对较大，占10％左右。

By using the data from Heilongjiang Lightning Detection Network（HLJDN） and Harbin Doppler radar, we studied and comparatively analyzed the cloud-to-groud （CG） lightning activities in two severe convective weather on 4 June 2007 and 7 July 2007. The results show that the thunderstorm cloud lead to disastrous weather when CG lightning activities occur in cluster, and when the convective events develop strongly, the intensity and quantity of CG lightning reach maximum CG lightnings mainly occur in echo region with reflectivity greater than 40 dBz. Sparse CG flashes usually occur on strong echo＇s periphery with 10 - 30 dBz. Along with the coming of precipitation, the intensity of the CG flash weakens. Generally, the positive CG flash accounts for 10% of the total, at the convective cell＇s developing stage.