景德镇闪电时空分布与强降水特征分析

Analysis of spatiotemporal distribution of lightning and characteristics of heavy precipitation in Jingdezhen

为了分析闪电与强降水的关系,文章利用2019-2021年江西ADTD雷电探测定位组网系统云地闪探测数据、江西雷达拼图和景德镇自动气象站数据,对景德镇地区闪电时空分布与强降水特征进行分析。结果表明:景德镇闪电以负闪为主(占比80.8%),闪电强度为-50 kA~50 kA(占比92.9%);闪电一般出现在39月,其中68月出现闪电频次最多(占比达73.9%);一天中13:00-20:00闪电频次最多(占比66.59%),07:00-11:00闪电频次最少;景德镇地区强降水过程中强闪电出现强降水的概率比较大,回波强度≥60 dBZ,降水强度超过50 mm/h;弱闪电有可能出现30~50 mm/h的强降水,回波强度为50~60 dBZ;无闪电情况下,只要回波强度为45~55 dBZ,也有可能出现30~40 mm/h的强降水。上述研究为景德镇闪电与强降水天气的监测预警提供了分析依据。

In order to analyze the relationship between lightning and heavy precipitation,this article uses cloud to ground lightning detection data from the Jiangxi ADTD lightning detection and positioning network system from 2019 to 2021,Jiangxi radar mosaic,and Jingdezhen automatic weather station data to analyze the spatiotemporal distribution of lightning and the characteristics of heavy precipitation in the Jingdezhen area.The results show that lightning in Jingdezhen is mainly negative(accounting for 80.8%),and the lightning intensity is between-50 kA to 50 kA(accounting for 92.9%).Lightning generally occurs from March to September,with the highest frequency of lightning occurring from June to August(accounting for 73.9%).The frequency of lightning is highest from 13:00 to 20:00 in a day(accounting for 66.59%),and lowest from 07:00 to 11:00.The probability of strong lightning occurring during heavy precipitation in Jingdezhen area is relatively high,with echo intensity≥60 dBZ and precipitation intensity exceeding 50 mm/h.Weak lightning may result in heavy precipitation of 30 mm/h to 50 mm/h,with echo intensity ranging from 50 dBZ to 60 dBZ;In the absence of lightning,as long as the echo intensity is between 45 dBZ to 55 dBZ,there may also be heavy precipitation of 30 mm/h to 40 mm/h.The above research provides analytical basis for monitoring and early warning of lightning and heavy precipitation weather in Jingdezhen.