利用ADTD地闪数据对河南省一次雷暴过程的分析

Analysis of a Thunderstorm Process in Henan Province Using ADTD Ground Flash Data

选取河南省2018年5月15日一次雷暴天气过程,利用ADTD地闪定位系统以及多普勒天气雷达等资料,分析地闪在该天气过程中的特征、初始地闪发生时的雷达回波特征以及地闪与垂直液态水含量、雷暴顶高的关系。结果表明,地闪在随时间的变化中具有多峰特征,整个雷暴过程中正地闪占总地闪的比例达50.8%;正地闪的突然增加能指示降雹的发生;地闪频数的变化与液态水含量高值区面积的变化趋势较一致;40 dBz回波高度与地闪频数的对应关系较好。

We selected a thunderstorm weather process in Henan Province on May 15,2018,using the data of ADTD ground lightning location system and Doppler weather radar and other data,the characteristics of ground flash in this weather process,the radar echo characteristics of initial lightning occurrence and the relationship between ground flash and vertical liquid water content and thunderstorm top height were analyzed.The results showed that the ground flashes had multi-peak characteristics in the change with time,and the proportion of positive ground flashes to total ground flashes during the entire thunderstorm process reached 50.8%;the sudden increase in positive ground flash could indicate the occurrence of hailfall;the change of ground flash frequency was more consistent with the change trend of the area of high value area of liquid water content;and the echo height of 40 dBz had a good correlation with ground flash frequency.