广东近年“龙舟水”期间地闪特征及其与降水关系  

Characteristics of ground flash and its relationship with dragon-boat precipitation in Guangdong in recent years

作　　者：钟雨珊 刘三梅 伍国裕 伍德超 Zhong Yushan;Liu Sanmei;Wu Guoyu;Wu Dechao(Jiangmen Meteorological Service Center,Guangdong Jiangmen 529000,China;Guangdong Climate Center,Guangzhou 510641,China;Jiangmen Emergency Warning Information Distribution Center,Guangdong Jiangmen 529000,China;Jiangmen Lightning Protection Company,Guangdong Jiangmen 529000,China)

机构地区：[1]江门市气象服务中心,广东江门529000 [2]广东省气候中心,广州510641 [3]江门市突发事件预警信息发布中心,广东江门529000 [4]江门市防雷公司,广东江门529000

出　　处：《气象研究与应用》2023年第1期106-111,共6页Journal of Meteorological Research and Application

基　　金：江门市气象局科学技术研究项目“上川岛毫米波云雷达雷电防护技术研究”。

摘　　要：选取广东2018-2022年“龙舟水”期间(5月21日—6月20日)发生在粤港澳地区地闪定位数据,分析其地闪发生的特征,并结合86个国家站逐日降水资料探讨了地闪强度、频次与降水的关系。结果显示:(1)广东近5a地闪强度集中在-40~15kA;正闪发生占比38.80%,平均电流为6.28 kA;负闪发生占比61.20%,平均电流强度为-16.18kA;(2)逐日闪电频次较多,主要集中在5月下旬至6月上旬;降水量与总地闪频次随年份起伏变化基本一致,二者呈弱相关,相关性系数为0.45;另外,近年“龙舟水”期间总地闪频次逐时变化呈单峰型,而2021年总地闪频次逐时变化呈双峰型,2022年总地闪频次逐时变化呈三峰型。(3)广东中心地区发生地闪密度大,其平均地闪强度相对较小,而四周边缘地区地闪密度小,平均强度反而大;另外,粤东、粤北等丘陵地区“龙舟水”期间地闪强度普遍在20~25kA;而雷州半岛地区平均地闪强度大于25kA,尤其是2022年平均地闪强度达到了40kA。This paper selects the ground-flash location data of Guangdong,Hong Kong and Macao during the period of dragon-boat precipitation in 2018-2022(May 21-June 20),analyzes the characteristics of the ground-flash occurrence,and discusses the relationship between the intensity,frequency and precipitation of ground lightning in combination with the daily precipitation data of 86 national stations.The results show that:(1)In this sample,the lightning intensity is concentrated in the range of-40~15kA;The proportion of positive flash is 38.80%with an average current of 6.28kA;The occurrence rate of negative flash is 61.20%with an average current intensity of-16.18kA;(2)During the period of Guangdong Dragon Boat Water from 2018 to 2022,the frequency of daily lightning is more frequent,mainly from late May to early June;The variation of precipitation and total ground flash frequency with year fluctuation is basically consistent,and the two are weakly correlated,with a correlation coefficient of 0.45;In addition,the hourly variation of the total ground flash frequency during the dragon-boat precipitation period from 2018 to 2020 is unimodal,while in 2021 and 2022 is bimodal and trimodal,respectively.(3)The density of ground flashes in the central area of Guangdong is large,and the average intensity of ground flashes is relatively small,while the density of ground flashes in the surrounding areas is small,and the average intensity is large;In addition,the intensity of ground lightning is generally 20~25kA during the dragon-boat precipitation period in hilly areas such as eastern and northern Guangdong;The average ground flash intensity in Leizhou Peninsula is more than 25kA,especially in 2022,the average ground flash intensity reached 40kA.

关 键 词：“龙舟水” 地闪定位数据 地闪强度 地闪密度 

分 类 号：P427.3[天文地球—大气科学及气象学]