2009-2018年荆门市闪电时空分布特征分析

利用湖北省二维闪电定位系统2009—2018年的云地闪电资料,分析了荆门市闪电时空分布特征。结果表明:荆门市云地闪以负闪为主,占93.35%,平均电流强度正闪明显高于负闪;闪电活动主要集中在7—8月和13:00—02:00时段内,负、正闪次数的比值在全年和全天存在明显差异;十年间荆门市闪电活动呈现显著逐年下降趋势,电流强度有逐年小幅上升的趋势;闪电密度空间分布呈西北至东南走向逐渐减小的特征。

Temporal and Spatial Distribution of Lightning in Jingmen between 2009 and 2018

The temporal and spatial distribution of lightning in Jingmen were analyzed with the data from the 2D lightning detection and location system of Hubei Province between 2009 and 2018.The results showed that,major cloud to ground lightning in Jingmen was negative with a proportion of 93.35%,but the average current intensity of positive lightning was obviously higher than negative.Lightning concentrated on July to August and 1 p.m.to 2 a.m.daily.There were large differences with the ratio of negative and positive lightning in the daily and all the year round.Lightning in Jingmen markedly declining while the current intensity slightly rising year by year in the 10 years.The spatial distribution of lightning density showed a character of reduction from the northwest to southeast.