广西前汛期和后汛期地闪特征差异及影响因子分析  

Comparative analysis of the cloud to ground lightning activity during pre and post flood season in Guangxi

作　　者：卢炳夫 植耀玲 伍华丽 LU Bingfu;ZHI Yaoling;WU Huali(School of Atmospheric Scienses,Zhuhai 519082;Gguagnxi Meteorological Disater Prevention Center,Nanning 530022)

机构地区：[1]中山大学大气科学学院,珠海519082 [2]广西壮族自治区气象灾害防御技术中心,南宁530022

出　　处：《暴雨灾害》2022年第2期224-231,共8页Torrential Rain and Disasters

基　　金：广西自然科学基金项目(2016GXNSFAA380184);广西重点研发计划项目(桂科AB20238035)。

摘　　要：利用2007—2017年闪电定位资料,对比分析广西前汛期和后汛期地闪活动特征差异并初步探讨其影响因子,结果表明:(1)前汛期和后汛期地闪频次日变化、空间分布差异明显,地闪平均雷电流幅值空间分布较为一致;(2)前汛期和后汛期地闪极性均以负地闪为主,前汛期正地闪发生概率较大,后汛期相对较小,正地闪平均雷电流幅值大于负地闪,后汛期大于前汛期;(3)南海夏季风强弱和爆发早晚对前汛期地闪活动影响较大,强度小及爆发早,地闪偏少,反之偏多;前汛期地闪活动高值区受地形引导大尺度冷暖气流频繁交绥影响较大,后汛期受午后太阳辐射增温、地形强迫抬升作用和热带天气系统影响较大。Based on the ADTD system lightning location data from 2007 to 2017 in Guangxi,the differences of cloud to ground flashes(CG)between the pre and post flood season were analyzed.In addition,the causing factors were discussed.The results are as follows.(1)During the pre and post flood season,the diurnal variation and spatial distribution of CG frequency were obviously different and the spatial distribu⁃tion of the average lightning current amplitude was relatively consistent.(2)There were mainly negative CG flashes in the whole flood season,and the positive CG flashes were more likely to occur in the pre flood and relatively rare in the post season.The average amplitude of positive lightning current was larger than that of negative lightning current,and the average lightning current amplitude in the post flood season was larger than that in the pre flood season.(3)The intensity and onset time of SCS summer monsoon had great influence on the lightning activi⁃ties in the pre flood season.Lower lightning intensity was accompanied by earlier occurrence and less CG flashes and vice versa.In the pre flood season,the high value area of CG flashes was greatly influenced by frequent interactions of large-scale cold and warm air flow under the guidance of topography.In the post flood season,the afternoon solar radiation,the uplift of the special topography and the tropical system weather had a great influence.

关 键 词：前汛期 后汛期 地闪 影响因子 

分 类 号：P427.3[天文地球—大气科学及气象学]