2019年兴安盟闪电活动时空分布特征

Analysis of Temporal and Spatial Distribution Characteristics of Lightning Activities in Hinggan League in 2019

利用ADTD闪电定位系统监测的云地闪资料和气象台站记录的雷电日资料,对2019年兴安盟闪电活动的时空分布特征进行了分析:结果表明:2019年云地闪以负闪为主,占78.6%;闪电活动主要集中在6—8月,闪电次数占全年总闪电次数的93.9%,7月闪电次数和闪电日数均最高;闪电次数呈现明显的日变化,在每日15∶00~16∶00闪电出现次数最多;闪电密度的高值区在突泉县西北部和科右中旗西北部,次高值区位于兴安盟西北部呈东北—西南向带状分布;正闪强度空间分布差异较小,无明显强度中心,负闪强度高值区在扎赉特旗南部。

Using the flash data monitored by the ADTD lightning positioning system and the lightning days data recorded by meteorological stations,the temporal and spatial distribution characteristics of lightning activities in the Hinggan League in 2019 were analyzed:the results showed that the lightning activity is mainly negative lightning,which accounts for 78.6%;lightning activities are mainly focus on between June and August,the number of lightning times accounted for 93.9%throughout the year,the number of lightning times and the number of lightning days are the highest in July;the number of lightning shows obvious daily changes,the high-incidence period of lightning activities focus on between 15 o‘clock and 16 o’clock in a day,and occurs most from 12 o‘clock to 20 o‘clock,accounting for 77.4%;the high value areas of lightning density are in the northwest of Tuquan County and the northwest of Keyouzhong Banner,the second high value area is located in the northwestern part of Hinggan League,and it is distributed in a northeast-southwest direction;the spatial distribution of positive flashes has little difference in intensity,and there is no obvious intensity center.The high value area of negative flashes is in the south of Zhalaite Banner.