一次强降水天气过程的雷暴及闪电活动的特征分析  

Analysis of Thunderstorm and Lightning Activity Characteristics of a Heavy Rainfall Weather Process

作　　者：周华 杨晓玲[2,3] 陈海贝 ZHOU Hua(Meteorological Bureau of Gulang County,Gansu Province,Gulang,Gansu 733100)

机构地区：[1]甘肃省古浪县气象局,甘肃古浪733100 [2]中国气象局兰州干旱气象研究所/甘肃省干旱气候变化与减灾重点实验室/中国气象局干旱气候变化与减灾重点开放实验室,甘肃兰州730020 [3]甘肃省武威市气象局,甘肃武威733000

出　　处：《农业灾害研究》2022年第9期160-162,共3页Journal of Agricultural Catastrophology

基　　金：干旱气象科学基金项目“石羊河流域高影响灾害天气气候特征及形成机理分析研究”(IAM202016);国家自然科学基金项目“河西地区高层大气向边界层动量下传对强沙尘暴的影响机制”(41975015)。

摘　　要：借助雷达、地闪定位系统、强电场法等先进监测设备和手段,利用大量的气象监测资料,系统研究探讨了甘肃地区及周边地区在发生极强降水运动时,天气系统的雷暴特性。结果表明:当日的活动范围内主要有2种不同类型的雷阵雨天气,这些雷阵雨体的混杂也是导致当日兰州市区重复性强降水和大雨量的一个主要因素。区域的降雨强度变化和相应的雷达回波强变化,具有一定的一致性,强回波通常对应强降水速率,而弱回波通常对应极弱的降雨速率。地闪活动则大多发生在雷阵雨运动的中后期、强回波的边缘区域、雷阵雨活动发展方向的最前部,地闪活动和回波强度之间的关联不甚明确。在该市出现极端强降水时发生的雷暴,上部通常为正电荷区,底部则为更高的负电性区。With the help of advanced monitoring equipment and means such as radar,ground flash positioning system and strong electric field method,and a large amount of meteorological monitoring data,the thunderstorm characteristics of the weather system in Gansu and its surrounding areas were systematically studied and discussed.The results showed that there are two different types of thunderstorms in the range of activity on that day,and the mixing of these thunderstorms was also a major factor leading to the repeated heavy rainfall and heavy rainfall in Lanzhou City on that day.The variation of regional rainfall intensity and the corresponding variation of radar echo intensity have a certain consistency.The strong echo usually corresponded to the strong precipitation rate,while the weak echo usually corresponded to the extremely weak precipitation rate.Most of the ground to ground lightning activities occur in the middle and late period of thunderstorm movement,the edge area of strong echoes,and the most front of the development direction of Thunderstorm Activities.The relationship between ground to ground lightning activities and echo intensity was not clear.Thunderstorms occur when extreme heavy rainfall occurs in the city.The upper part was usually a positive charge area,and the lower part was a higher negative charge area.

关 键 词：天气学 强降水:雷暴 闪电活动 

分 类 号：P427.32[天文地球—大气科学及气象学]