基于LLS的清远地区雷电活动特征  

On the Characteristics of Lightning Activities of Qingyhuan Area Based on a Lightning Location System

作　　者：李阳斌 刘三梅 李翠华 陈绍东[2] 

机构地区：[1]清远市气象局,广东清远511518 [2]广东省防雷中心,广东广州510080

出　　处：《广东气象》2015年第4期19-21,26,共4页Guangdong Meteorology

基　　金：广东省气象局科研项目(GDLPC-Sel-003-2014)

摘　　要：利用1999--2013年清远气象观测站资料、闪电定位系统（LLS）地闪数据，采用相关分析、线性趋势等多种统计方法，分析清远地区的雷电活动特征。分析表明：近15年清远地区地闪以负地闪为主；地闪数年际变化呈线性增加趋势；地闪月分布集中出现在4—9月份，占地闪总数的96．98％；地闪时分布总体呈单峰特征，一天中地闪频数峰值出现在15：00—17：00，占全天地闪频数的34．13％；年平均地闪密度13．52次·km-2·年-1，呈东南至西北递减；地闪电流集中在10～40kA之间，占地闪总数72．01％。地闪数与雷暴日数之间正相关特征显著。Using the data of meteorological stations and a lightning location system in Qingyuan from 1999 to 2013 and statistical methods of correlation analysis and linear trends, we studied the characteristics of the lightning activity in the Qingyuan area. As shown in the analysis, the local lightning is mainly of negative cloud-to-ground （CG） flashes over the 15 years, which has been increasing linearly on the interannual scale. For the monthly distribution, the CG lightning occurs mainly in April to September, taking up 96.98% of the CG total. Generally unimodal, the CG lightning mainly takes place between 15：00 and 17：00, accounting for 34. 13% of the diurnal total of CG. At a rate of 13.52 times o km-2/year, the annual mean CG lightning density decreases from the southeast to the northwest. The CG lightning current intensity is mainly between 10 and 40 kA, taking up 72.01% of the CG total. The number of CG lightning is positively correlated with that of thunderstorm by a coefficient of r = 0. 76, which passes the 0. 001 t-test, suggesting significant correlation between them.

关 键 词：大气现象 闪电定位系统 地闪 雷暴日数 清远地区 

分 类 号：P427[天文地球—大气科学及气象学]