贵州省闪电活动时空分布特征分析

Analysis of Temporal and Spatial Distribution Characteristics of Lightning Activity in Guizhou Province

利用近10年闪电监测定位系统监测的地闪资料,分析贵州省闪电活动时空分布特征,结果表明:全省以负极性闪电为主,占96%左右,闪电活动主要集中在全年的3~10月、全天的13~04时,而正极性闪电频数比例却集中在总闪低发月、时段,分别占同期总闪数的32.5%、11.5%,远高于年均比例4.02%;不同季节、时段闪电密度均存在地域性差异,整体呈现西部高于东部;春季多发生在全省西南至东北一线,夏秋季节向北部移动,集中分布贵州西北部,后冬季移至中部至东北一线;上午闪电活动分散在全省,随后下午到前半夜多发生在西部区域。

With the ground lightning data acquired through the national lightning monitoring and positioning system for the last ten years,temporal and spatial distribution characteristics of lightning activity in Guizhou Province were analyzed. As the results show,the lightning activity in the province is mainly negative lightning,which accounts for about 96%; the high-incidence period of lightning activities focus on between March and October in a year and between thirteen o‘clock and four o’clock in a day,while positive lightning frequency increases in the low-incidence period and time-span,taking up 32. 5% and 11. 5% of the total flashes correspondingly,much higher than that of average annual rate of 4. 02%; flash densities in different seasons and time-spans are different in regional differences with an overall tendency of high west to low east; lightning activities mostly occur along a southwest-to-northeast line within Guizhou in Spring,moving northward in Summer and Autumn to northwestern Guizhou being the highincidence area,and taking a middle-to-northeast line in late Winter; lightning activities daily occur in a scattering way in the whole province,while from the afternoon to the first half of the night mainly distribute in the western region.