粤港澳大湾区两套闪电定位系统地闪探测性能的对比分析

COMPARATIVE ANALYSIS OF CLOUD-TO-GROUND LIGHTNING DETECTION BY TWO LIGHTNING LOCATION SYSTEMS IN GUANGDONG-HONG KONG-MACAO GREATER BAY AREA

关键词:  闪电定位系统  粤港澳大湾区  地闪探测  探测效率  相对定位精度

Key words:  lightning location system  Guangdong-Hong Kong-Macao Greater Bay Area  cloud-to-ground lightning detection  detection efficiency  relative positioning accuracy

摘要:

根据2014—2018年粤港澳闪电定位系统（GHMLLS）和广东电网地闪定位系统（GDLLS）两套闪电定位系统的观测资料，对粤港澳大湾区范围内二者的地闪探测性能进行评估和对比，结果表明，在粤港澳大湾区，对于地闪回击记录，从各月份记录和空间密度的分布上来看，GDLLS的探测数都多于GHMLLS，二者的比值为1.24；两套系统总回击、负回击、正回击的月分布和日变化特征基本一致；两系统地闪回击的匹配记录在大湾区大部分区域内的偏差量都在1.5 km内；对于匹配后的负、正回击电流峰值，二者有较强的相关性，相关系数分别为0.99和0.98，GDLLS的负、正回击电流峰值分别为GHMLLS的1.47倍和1.45倍。

Abstract:

Based on the observational data from the Guangdong-Hong Kong-Macau Lightning Location System (GHMLLS) and the Guangdong Lightning Location System (GDLLS) during 2014—2018, the present study evaluated and compared the two systems in cloud-to-ground (CG) lightning detection in the Guangdong-Hong Kong-Macao Greater Bay Area (GBA). The results are as follows. In the GBA, the value reported by GDLLS is more than that reported by GHMLLS in terms of monthly records and spatial density distribution, and the ratio of the two is 1.24. The monthly distribution and diurnal variation characteristics of total return strokes, negative return strokes and positive return strokes are basically the same. The positioning deviation of the two systems in most areas of the GBA is within 1.5km. Strong correlations are obtained for the peak current of negative and positive return strokes after matching, and the correlation coefficients are 0.99 and 0.98, respectively. The peak current of negative and positive return strokes reported by GDLLS is 1.47 times and 1.45 times those reported by GHMLLS, respectively.