蒙古东部冷涡造成河北中南部雹暴过程的地闪特征分析  

Analayese on CG Lightning Characteristics in Hailstorm process in Center-South Parts of Hebei Caused East Mongolia Cold Vortex

作　　者：连志鸾[1] 高连山[1] 李国翠[1] 赵瑞金 赵彦厂[1] 

机构地区：[1]河北省石家庄市气象局,河北石家庄050081 [2]河北省气象台,河北石家庄050021

出　　处：《高原气象》2009年第1期186-194,共9页Plateau Meteorology

基　　金：河北省“十五”重点科技攻关项目(03220602D);河北省气象局科研开发项目(07ky03)共同资助

摘　　要：应用地面闪电定位系统、多普勒雷达、加密自动雨量站资料，对2007年7月8～9日蒙古东部冷涡天气系统下，发生在河北中南部的两次雹暴过程进行了分析。结果表明：两次雹暴均产生大量地闪活动，且以负地闪占优势，闪电集中发生时段与强对流发生及维持时间相当。雹暴和强降水在时空分布上对应的地闪极性有明显差异，降雹发生在雹暴云团中正地闪最活跃的阶段，正地闪集中出现在强回波中心及其邻近区域，降雹点落在正地闪聚集区附近；对流性强降水云团中负地闪频繁发生，强降水区出现在负地闪密度高值中心附近，负地闪簇集区域预示着对流性强降雨的落区。多单体风暴中，闪电的频率及聚集区域主要取决于雷暴单体的数目、强度和相互接近的程度，其造成的强降雹主要发生在总地闪的活跃期。本次个例分析显示，总闪电频数跃增、正闪频数突增，仅先于降雹数分钟（几乎同时）发生。因此，根据闪电频数变化可监测对流强度的演变和冰雹天气的发生。Using the data from Lightning Detection Network, Doppler radar and intensified Automatic Surface Observation System, the temporal and spatial distributions of CG lightning is investigated for two hailstorms under cold vortex over East Mongolia synoptic situation on 8-9 July 2007. The results show that a great deal of CG lightning produced and negative CG lightning predominated during the two hailstorms. The periods of time that CG lightning were intensively occurred to were equivalent to the severe convective holding time. CG lightning pole feature in hailstorm was obvious difference from convectional rainstorm. Shooting hail took place in the most of active stage of positive CG lightning. The positive CG lightning clustered in the region with maximum intense echo. Point of falling hailstone was at the nearby of positive CG flashes compact area. Negative flash rate was high in convectional heavy precipitation cloud. Severe rainfall occurred nearby high density center of the negative flash. In multi-cell storm, rate and cluster area of CG lightning depend on the number, strength and closeness of cells. Severe shooting hail caused by multi-cell storm happened at the stage with active CG lightning . In the case, the peak of CG flash rate and the sudden enhancement of positive flash rate is only a few minutes prior to the hail events （nearly same time）, so flash rate could be used to monitor the development and evolution of convective and hail events.

关 键 词：河北中南部 蒙古东部冷涡 雹暴 闪电 地闪频数 

分 类 号：P427.3[天文地球—大气科学及气象学]