2006—2007年湖北地区云地闪电时空分布特征分析  

Analysis on the Spatio-temporal Distribution Features of Cloud-to-ground Lightning in Hubei Province During 2006-2007

作　　者：王学良[1] 黄小彦[1] 刘学春[1] 王海军[2] 涂山山 

机构地区：[1]湖北省防雷中心,武汉430074 [2]湖北省气象信息与技术保障中心,武汉430074

出　　处：《暴雨灾害》2008年第4期359-362,共4页Torrential Rain and Disasters

基　　金：湖北省气象局科技发展基金项目"湖北省雷电灾害时空特征研究"(2007Y03)资助

摘　　要：采用湖北不同地理位置的13个雷击探测仪组成的闪电监测定位系统获取的2006年3月至2008年2月的云地闪电资料，从闪电的极性分布、日变化、月变化、强度、闪电密度等方面研究了湖北地区云地闪电时空分布特征。结果表明：云地闪电中负闪电占闪电总数的96．3％，平均闪电强度32.33kA；正闪电占闪电总数的3．7％，平均闪电强度42．24kA；闪电频次的日变化呈明显的单峰单谷型，一日中，最大值出现在15-16时，最小值在09-10时；一年中，4-8月闪电次数占全年闪电总数的96．7％，其中7-8月闪电次数最多；正、负闪电的强度主要集中在10～45kA，80％以上闪电强度不大于45kA，100kA以下的闪电次数约占闪电总数的98．6％；闪电密度分布呈明显的地域性差异，鄂东南的嘉鱼、咸宁、黄石、鄂州一带为闪电高密度区，鄂西的远安、宜昌、枝江一带为闪电次高密度区，两个闪电高密度区基本上都发生在山区与丘陵、平原交接地带。Based on the cloud-to-ground lightning data collected by the lightning detection and location system composed of 13 lightning detectors from March 2006 to February 2008, the daily and monthly lightning variation are studied to analyze the spatio-temporal distribution features of cloud-to-ground Lightning in Hubei, as well as lightning intensity, polarity and density. The results are showed as follows： the percentage of negative lightning to total lightning number is 96.3% with the average lightning intensity of 32.33 kA, the percentage of positive lightning is 3.7% with the average intensity of 42.24 kA; daily variation of lightning frequency shows obviously single peak and single valley, its maximum value appears during 3-4 PM., the minimum value appears in 9-10 AM.. The number of the lightning appearing from April to August is 96.7% of the annual total; the lightning appears most frequently in July and August; the intensity of positive and negative lightning is mainly concentrated in 10-45 kA, about 80% of the lightning intensity is not more than 45 kA. The number of the lightning whose intensity being less than 100 kA accounts for 98.6% of the total; the lightning density distribution has obvious regional difference, one high density area of lightning is southeast Hubei including Jiayu, Xianning, Huangshi, Ezhou. Another area is in west Hubei including Yuan-an, Yichuang, Zhijiang, the two areas are both in the regions conjoining the mountains with hilly or plain.

关 键 词：云地闪电 时空变化 闪电强度 闪电密度 

分 类 号：P446[天文地球—大气科学及气象学]