淮安地区闪电活动时空分布特征分析

摘要

Using the Huaian region lightning location data from 2011 to 2014,this paper analyzed lightning frequency,time distribution of lightning,lightning spatial variation characteristics of Huaian region.The results showed that Huaian region was given priority to with negative lightning,accounted for 90%;the lightning activities had significant differences,lightning mainly concentrated in June to Sepember,accounted for 96%of the total number lightning;the peak period of the lightning activities was 1400-1800 in the afternoon,the trend of negative flash and total flash was consistent,the number of positive flash change unobviously;Lightning density larger areas were mainly concentrated in the southern and eastern regions;The average density of lightning was 2.39 times per square kiolmeters every year;The total flash intensity focused on 10~40 kA;Lightning strength greater than 32 kA cumulative probability was less than 50%.%利用淮安地区2011-2014年闪电定位资料，分析了淮安地区闪电发生频次、闪电时间分布规律、闪电空间变化、雷电流累积概率分布特征。结果表明：淮安地区闪电活动以负地闪为主，占90%；闪电活动月分布差异性较大，地闪主要集中在6要9月，发生闪电次数占全年总数的96%；近4年来闪电频数日变化呈单峰型，闪电活动的高峰期为14：00-18：00，负闪与总闪日变化趋势相一致，正闪数量逐月波动不明显；闪电密度较大的地区主要集中在南部以及东部区域，平均闪电密度为2.39次/km2·年；总闪强度集中在10~40 kA，闪电强度大于32 kA的累积概率小于50%，并拟合出大于某闪电强度累积概率方程。