湖北省两套闪电定位网地闪数据的对比分析

Comparative analysis of cloud-ground flash data of two lightning location networks in Hubei Province

基于定位方式、电流强度和归闪标准三个方面对2016—2018年湖北省ADTD二维闪电定位网和VLF/LF三维闪电定位网的闪击数据进行了质控,并讨论了不同质控方法的差异,结果显示三维闪电定位网的探测灵敏度和探测效率显著高于二维闪电定位网,前者探测到的闪击总数约为后者的2.3倍,且能探测到更多弱的正闪击,闪电强度也更为集中。与此同时,对质控后的地闪数据的时间、空间和强度分布特征进行了对比分析,结果显示两套闪电定位网的负地闪日分布、月分布、地闪密度分布等变化特征相似;正地闪存在一定差异:二维闪电定位网的日分布和三维闪电定位网的月分布呈单峰分布特征,而二维闪电定位网的月分布和三维闪电定位网的日分布则呈双峰变化特征。总体而言,质控后的地闪数据与湖北省雷电日数的月分布以及闪电密度的地域分布均相符,表明相关质控方法是合理有效的。

Based on location mode,current intensity and clustering standard,quality control is carried on the lightning stroke data of ADTD two dimensional lightning location network(2D-LLN)and VLF/LF three dimensional lightning location network(3D-LLN)in Hubei province from 2016 to 2018,and the differences between different quality control schemes are also discussed.The analysis results show that the detection sensitivity and efficiency of 3D-LLN are significantly higher than those of 2D-LLN,with about 2.3 times more lightning strokes detected by the former than the latter.Among them,3D-LLN can detect more positive lightning strokes of small peak current,and is with more concentrated lightning intensity.At the same time,the variation characteristics of negative cloud-ground flashes,such as the daily distribution,the monthly distribution and the density distribution,are quite similar,although there are still some differences in the positive cloud-ground flashes.That is,the daily distribution of 2D-LLN and the monthly distribution of 3D-LLN are unimodal distributed,while both the monthly distribution of 3D-LLN and the daily distribution of 2D-LLN present bimodal characteristics.In general,the data after quality control is consistent with the monthly distribution of lightning days and the regional distribution of lightning density in Hubei province,indicating that the quality control scheme is reasonable and effective.