柳州市强对流暴雨的闪电和雷达回波特征及相关性研究-气象研究与应用

文章信息/Info

Title:: Characteristics of Lighting and Radar Echoes of Strong Convective Rainstorm and Their Relations in Liuzhou

Author(s):: Chen Rui; Liu Zhou-rong; Liuzhou Municipal Meteorological Service, Liuzhou Guangxi 545002

Keywords:: strong convective rainstorm; lightning characteristics; radar echo; relativity

摘要:: 利用闪电监测资料和多普勒天气雷达探测资料,对2015年汛期强对流暴雨的闪电和雷达回波特征及相关性进行分析,结果表明:柳州强对流性暴雨时的闪电以负闪电为主;暴雨日降水量与日闪电数相关小,强的降水不一定有强的闪电活动;伴随有闪电活动的强对流暴雨逐时降水量与逐时闪电频数演变曲线具有峰型特征和趋势一致,闪电先于降水之前开始,降水量峰值比闪电频数峰值落后1小时;径向速度不均匀风场结构存在利于对流回波的发展和闪电的发生,强对流暴雨的闪电活动与强回波区有较好的对应关系,闪电一般发生在反射率因子≥ 45dBz和回波顶≥ 6km的区域。

Abstract:: Based on cloud-ground lightning data and Doppler weather radar echo data strong convective rainstorms in 2015 of Liuzhou, the characteristics of lightning and radar echoes and the relations between them are analyzed. The results show that:most lightning of convective rainstorms was negative; the relativity between precipitation and the number of lightning are small. The evolution curve of hourly rainfall of strong convective storm with lightning and the hourly lightning frequency show peak pattern and the similar changing trend. But the lightning occurred before raining about 1 hour. The uneven wind field structure in radial velocity is conducive to the development of convective echo and the occurrence of lightning, lightning activity of strong convection rainstorm and strong echo area have good corresponding relationships with lightning occurring when the reflectivity is ≥ 45 DBZ and the area of top echo reaches up to above 6 km.