ANALYSIS OF CLOUD-TO-GROUND LIGHTNING CHARACTERISTICS IN MESOSCALE STORM IN BELIING AREA  

作　　者：葛正谟 言穆弘 GuoChangming 郭昌明 张广庶 

机构地区：[1]Lanzhou Institute of Plateau Atmospheric Physics,Academia Sinica,Lanzhou 730000

出　　处：《Acta meteorologica Sinica》1992年第4期491-500,共10页

基　　金：supported by grants from State Planning Commission under Grants No.75-09-02-19

摘　　要：The research indicates that there is a positive correlation between the negative CG flash rate and the area of radar echo with its reflectivity being equal to or greater than 30 dBz in the mesoscale convective system in Beijing area.A max- imum of the positive CG flash rate exists at both the initial and the dissipating stages.The CG flashes are usually located near but not within the high reflectivity center.The negative flashes are associated with.the positions of the updraft re- gion,and with the regions of wind convergence and wind shear.Generally,the negative CG flashes are concentrative and the positive ones are dispersive.The research indicates that there is a positive correlation between the negative CG flash rate and the area of radar echo with its reflectivity being equal to or greater than 30 dBz in the mesoscale convective system in Beijing area.A max- imum of the positive CG flash rate exists at both the initial and the dissipating stages.The CG flashes are usually located near but not within the high reflectivity center.The negative flashes are associated with.the positions of the updraft re- gion,and with the regions of wind convergence and wind shear.Generally,the negative CG flashes are concentrative and the positive ones are dispersive.

关 键 词：CG(cloud-to-ground)lightning mesoscale convective system radar echo evolution of lightning activity 

分 类 号：P4[天文地球—大气科学及气象学]