北京地区地闪活动时空分布特征  

Diurnal variations of lightning activity in Beijing

作　　者：梁丽[1] 庞文静[1] 雷勇[1] 王志超 梁存 LIANG Li;PANG Wenjing;LEI Yong;WANG Zhichao;LIANG Cun(Meteorological Observation Center,China Meteorological Administration,Beijing 100081,China;State Grid Huainan Electric Company,Anhui Huainan 232007,China)

机构地区：[1]中国气象局气象探测中心,北京100081 [2]国网淮南供电公司,安徽淮南232007

出　　处：《气象科学》2019年第4期515-523,共9页Journal of the Meteorological Sciences

基　　金：中国气象局气象探测中心青年科技课题(TCQN201602)

摘　　要：基于国家雷电定位网2010-2014年雷电定位数据和2010-2013年地面气象资料,分析了北京地区各季地闪活动时空分布特征及其与降水量的关系。结果表明,北京地区雷电活动具有明显的日变化特征;雷电发生频次随季节变化明显,负闪和全地闪在秋季变化幅度最大;雷电发生频次最大值和最小值出现时间随季节变化,春季、夏季日循环峰值出现时间在22∶00-23∶00(北京时间),秋季日循环峰值出现时间在01∶00,冬季则为15∶00且不具有显著性;从空间分布上看,可以看出雷电活动分布具有局地性特征,北京地区雷电活动最频繁的地区集中在密云县和平谷区的迎风坡一带、通州区与市辖区交界处,高雷暴日区域位于延庆县、昌平区和平谷西部,延庆县和怀柔区的北部及房山区和门头沟交界处的西部,雷暴发生频次和雷暴日空间分布不完全吻合。通过各季雷电发生频次日变化序列的谐波分析可知,日循环为日变化的主要信号。春季、夏季、秋季雷电发生频次和降水量两者整体变化趋势一致,降水量较雷电发生频次变化缓慢。In this paper,the characteristics of lightning activity and its relationship with precipitation are analyzed based on the flash data of National Lightning Detection Network of China from 2010 to 2014 and ground meteorological data from 2010 to 2013.The results show that the lightning activity in Beijing area has obvious diurnal variation.The flash rate varies significantly with seasons,especially negative lightning and all-earth lightning vary the most in autumn.The diurnal maximum and minimum value of flash rate changes with seasons.The diurnal peak hour in spring and summer is the 22∶00-23∶00 cycle,01∶00 in autumn,and 15∶00 in winter,not significantly.The spatial distribution of lightning activity has local variation,with the highest flash density concentrated in the windward slope region of Miyun and Pinggu,the junction area between Tongzhou and the central city.The highest thunderstorm day per year value locates in Yanqing,Changping and western Pinggu,the northern part of Yanqing and Huairou,and the eastern part of Mentougou.The distributions of flash rate and thunderstorm days are incompletely coincident.According to the harmonic analysis of diurnal variation of flash rate,the diurnal cycle is the key variance.The total tendency of flash rate and precipitation in spring,summer and autumn is coincident,while the precipitation changes slower than that of flash rate.

关 键 词：时空分布 雷电频次 谐波分析 降水 

分 类 号：P427.321[天文地球—大气科学及气象学]