江苏夏季一次雷暴条件下降雨与地闪的关系分析

Analysis on the Relationship between Rainfall and Cloud-to-Ground Lightning in Summer Thunderstorm of Jiangsu

从夏季雷暴条件下闪电、对流、降水3个显著特征出发,分析地闪(CG)与降雨之间的时空对应关系,为雷暴研究和数据应用提供个例支持。选择江苏省一次强度大、持续长的强雷暴过程,把降雨和CG资料按时间、空间、强度等分组对应,经分析表明,①-CG在总地闪中占绝对数量,大多数-CG数密度比例和降雨有正相关关系,雷暴开始初期,多出现负地闪时间提前于降雨约10 min的情况;当+CG数密度比例、强度均增加时,地面基本无降雨,配合雷达资料和云中电过程理论分析,可能是由于出现冰雹龙卷或者电荷反转造成;②-CG与降雨的时空一一对应关系优于+CG,且时空对应情况下两者数值关系类似幂函数。

Based on marked summer thunderstorm features of lightning,conviction and precipitation,the space-time relationship between rainfall and Cloud-to-Ground（CG） are analyzed,which can be used to studies of thunderstorm analysis and corresponding data application.One strong,long-standing thunderstorm in Jiangsu Province and thereabout is chosen to analyze,leading to the fact that ①-CG is in the majority and its number density ratio is positive relevant to rainfall.At the beginning of storm,occurred time of-CG is ahead of rain with about 10 min.However,under the condition of increasing number density and intension of ＋CG,followed rainfall values are zero,which means the possibility of occurred hail or spout or electric charge reversion.②About one-to-one relationship of time and space,-CG is better than positive one.Furthermore,this one-to-one value relation looks like power function.