XIE Xiaolin,HU Di,LUO Yuang,et al.Analysis of Doppler Radarand Lightning Characteristics in“8·11” Severe Convective Weather in Chengdu[J].Journal of Chengdu University of Information Technology,2022,37(06):701-708.[doi:10.16836/j.cnki.jcuit.2022.06.013]
成都“8·11”强对流天气多普勒雷达与闪电特征分析
- Title:
- Analysis of Doppler Radarand Lightning Characteristics in“8·11” Severe Convective Weather in Chengdu
- 文章编号:
- 2096-1618(2022)06-0701-08
- 分类号:
- P412.25
- 文献标志码:
- A
- 摘要:
- 为研究雷暴云雷达回波的典型特征,统计成都2020年4-9月天气雷达和闪电定位仪数据,通过“8·11”成都区域性特大暴雨天气过程,分析了强对流天气的闪电数据与雷达回波雨带的特征关系,得出以下结论:(1)2020年成都雷暴8月数量最多,闪电主要发生在雷达反射率因子40～60 dBZ,闪电强度主要集中在20～100 kA。(2)雷暴云有4个雷达回波特征:雷暴云的中低层仰角径向速度存在逆风区,可作为对流云闪电发生的标志; 雷暴云发展到成熟阶段时,雷达径向速度低层存在辐合,中层出现零速度闭合线,高层有弱辐散特征,闪电发生数量增加; 闪电位置主要分布在雷达VIL超过10 kg·m-2的区域附近; 雷暴云存在质心下移现象。将这些雷达回波特征在35373次闪电数据中进行统计分析,得到较高的典型性结果,对提高雷暴云的识别和灾害预警速度有一定参考价值。
- Abstract:
- In order to study the radar echo characteristics of thunderstorm clouds, the weather radar and lightning locator data from April to September in Chengdu in 2020 is studied. Based on the data of “8·11”regional rainstorm weather in Chengdu, the relationships between lightning data and radar echo of strong convective weather are analyzed. It drawsthese conclusions as follow:(1)in 2020, thunderstorms of Chengdu mainly occur in August. When lightning occurs, the reflectivity of radar is mainly between 40-60 dBZ, and the main range of lightning intensity is between 20-100 kA.(2)There are four kinds of radar echo characteristics of thunderstorm clouds are found:there is an upwind region in the middle and lower elevationof thunderstorm cloud radar velocity data, which can be used as a sign of lightning in convective cloud; when the thunderstorm cloud develops to mature stage, there is convergence in the low level of thunderstorm cloud, zero velocity polyline is closed in the middle level, weak divergencecharacteristics exists in the high level, and the number of lightning increases; the location of lightning is mainly distributed near the area where VIL of radar exceeds 10 kg·m-2; the center of massof thunderstorm cloud moves downward. According to the statistics of 35373 numbers of lightning data, these radar echo characteristics are considered to be highly typical. It has a certain reference value for improving the speed of thunderstorm cloud identification and disaster early warning.
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备注/Memo
收稿日期:2021-11-10
资助项目:高原与盆地暴雨旱涝灾害四川省重点实验室青年专项资助项目(SCQXKJQN2019016); 四川省气象局科学技术研究开发课题资助项目(川气探数课题2019-5)