闪电定位系统异常前后资料的对比分析及其t检验

Data Comparative Analysis and t Test Before and After the Lightning Location System for Equipment Anomaly

为了探讨闪电定位系统异常对闪电定位资料影响的显著性,分别利用闪电的时空分布、地闪强度对浙江省2008年和2007年全年闪电定位资料进行对比分析和t检验。结果表明,2008年与2007年闪电时间变化特征差异不显著,时变化和月变化都有较好的一致性;而空间分布特征变化显著,大多数区域闪电密度都出现了明显变化;地闪强度(包括正闪和负闪)累积百分比也未有显著性变化,无论正闪还是负闪,50 kA以下闪电占绝大多数。通过进一步对比分析2008年和2007年的闪电定位方式和大气环流特征,认为浙江省闪电定位系统异常前后未造成资料明显差异。

To explore the significance that lightning location system abnormalities effects on the lightning location data,the comparative analysis and t test of the lightning location data in 2008 and 2007 were conducted by temporal and spatial distribution,ground flash intensity over Zhejiang.The results show that the temporal distribution did not change significantly between 2008 and 2007,monthly and time changes both have a good consistency;the spatial distribution in 2008 are obviously different with 2007,the lightning density of most regions has shown a significant change;the cumulative percentage of ground flash intensity（including positive ground flash and negative ground flash） also did not change significantly between 2008 and 2007,whether positive ground flash or negative ground flash,less than 50 kA accounted for the vast majority.The data don＇t have significant change before and after the lightning location system for equipment anomaly by further comparative analyzing lightning location technology and atmospheric circulation characteristics of 2008 and 2007 in Zhejiang province.