广西ADTD和VLF/LF闪电定位系统地闪数据对比分析

Comparative analysis on ADTD and VLF/LF lightning location system of cloud-to-ground lightning data in Guangxi

为了比较ADTD和VLF/LF闪电定位资料的准确性,文章基于广西2016~2018年ADTD和VLF/LF的地闪数据和高程数据,研究两套闪电定位系统的地闪分布特征差异。结果表明:两套系统的地闪频次月变化、日变化以及正负地闪频次比的月变化具有相似的分布趋势,而两套系统在地闪频次、地闪闪电日数、负地闪占总地闪的比例、地闪密度、地闪强度等方面存在较大的差异。两套系统的地闪密度差随海拔高度增加而减小;VLF/LF系统单位面积上0~50 kA地闪频次占地闪总频次比值与海拔高度具有良好相关性,但ADTD系统监测结果显示两者相关性不显著。

In order to compare the accuracy of the ADTD and VLF/LF lightning location data,based on the ADTD and VLF/LF cloud-to-ground(CG)lightning data from 2016 to 2018 and elevation in Guangxi,this paper studies the CG lightning different distribution characteristics between the two lightning location systems.The results show that the two systems have some essentially consistent distribution trends on the monthly and daily variations of CG lightning frequency as well as the monthly variation of the percentage of positive CG lightning frequency accounting for negative CG lightning.However,there are larger differences in the frequency of CG lightning,CG lightning days,the percentage of negative CG lightning frequency accounting for total CG lightning,lightning density,lightning intensity and so on between the two systems.The subtraction of lightning density detected by the two systems is decreasing with increasing elevation.The CG lightning frequency ratio of 0~50kA per unit area of VLF/LF system has a good correlation with the elevation.However,the monitoring results of ADTD system show that the correlation between them is not significant.