Relationship between radar reflectivity thresholds and very low frequency/low frequency total lightning for thunderstorm identification  

作　　者：Yijun Huang Jianguo Wang Li Cai Yadong Fan Hongbin Wang Tao Zhang 

机构地区：[1]Engineering Research Center of Ministry of Education for Lightning Protection and Grounding Technology,School of Electrical Engineering and Automation,Wuhan University,Wuhan,China [2]State Grid Hubei Extra High Voltage Company,Wuhan,China [3]Guangdong Power Grid Corporation,Guangzhou,China

出　　处：《High Voltage》2024年第5期1068-1080,共13页高电压（英文）

基　　金：Fundamental Research Funds for the Central Universities,Grant/Award Number:2042023kf0183;National Natural Science Foundation of China,Grant/Award Numbers:52177154,51807144。

摘　　要：To improve our knowledge of the spatio-temporal correspondence between radar reflectivity and VLF/LF total lightning data,this paper proposes indexes to quantify the horizontal distribution and temporal evolution characteristics between radar composite reflectivity images and total lightning density map,lightning clusters and radar cells with different radar reflectivity thresholds(30,35,40,45 and 50 dBZ),respectively.It is found that the number of radar grid cells with radar reflectivity over 30 dBZ is ten times the number of lightning grid cells.At the identification stage,the lightning activity regions in a radar cell account for less than 30%using thresholds of 30,35 and 40 dBZ,respectively,and the radar cell has more than one lightning cluster,which means that the mesoscale convective systems typically have more than one draft,and drafts are only small part of the convection.The majority of the centroid deviations is less than 10 km,indicating that there are some shifts between electrically active regions and convective regions.Results suggest that VLF/LF total lightning data are consistent with radar data and total lightning data can be used individually on a smaller spatio-temporal scale than radar data.

关 键 词：LIGHTNING REFLECTIVITY typically 

分 类 号：TN95[电子电信—信号与信息处理]