安徽省马鞍山地区闪电时空分布特征

利用2006--2009年安徽省LD—II型闪电定位资料，对马鞍山地区闪电时空分布特征的分析表明，马鞍山地区以负闪为主，负闪占总闪电数的98％，平均闪电强度44．5kA。正负闪电发生的频次有明显的季节变化和日变化特征。闪电季节变化上呈单峰型，峰值出现在7月，集中发生在5—9月的雨季，占总闪电频次的97％；闪电日变化上呈双峰型，峰值出现在14：00和21：00。闪电强度冬季低、夏季高，多集中于20～30kA之间。平均地闪密度有两个明显的极大值中心，一个是穿越和县和含山中部的狭长带状区域，另一个集中在和县北部。平均闪电强度和平均地闪密度在空间上呈相反的分布形式。利用实测的地闪密度与雷暴日的关系得出了适用于马鞍山地区1市3县的地闪密度计算公式。

The Spatial and Temporal Distribution of Lightning at Maanshan Area in Anhui Province

Based on the lightning location data of the LD-II in Anhui Province from 2006 to 2009, the spatial and temporal distribution of lightning at the Maanshan area was analyzed . The results show as follows. In Maanshan area negative lightning flash was dominant reaching 98% of the total lightning occurence and the average intensity was 44.5 kA.The lightning frequency characteristics had obvious seasonal variation and daily variation.Seasonal changes showed a single peak,which appeared in July. Lightning concentrated in May-September in the rainy season and the frequency was 97% of the total lightning. Daily variation had the two peaks at 14：00 and 21：00.The lightning intensity was low in winter and high in summer concentrating between 20-30 kA.The average ground flash density had two distinct maxima. One was a narrow strip across the Hexian and Hanshan. Another was concentrated in the northern Hexian. The spatial distributions of average intensity of lightning and ground flash density was applies to the 1 city and 3 counties were obtained ground flash density and thunderstorm. opposite, the ground flash density formulas that based on the relationship between the measured