福建省2次强雷暴天气的环境参数成因分析

Analysis of Environmental Parameters Causing Two Severe Thunderstorms in Fujian Province

针对福建省2022年7月22日和25日2次雷暴天气过程发展与成因,采用欧洲中期天气预报中心ERA5再分析资料(水平分辨率为0.25°×0.25°)和对应研究时段的福建省16个闪电定位仪监测数据,分析了不同层次(500、700、850 hPa)的高空环境背景场和动力热力场等。结果表明:2次雷暴天气均以动力抬升雷暴和热力抬升雷暴2种情形为主导;7月25日福建省北部地区强对流主要受热力因素影响,南风携带南海水汽在中部受东风气流影响辐合与垂直直上的暖湿气流在福建省中南部引发对流运动,其次中部地区处于明显切变线中,热力与动力结构相结合,加强了对流发展强度。

In view of the development and causes of the two thunderstorm weather processes in Fujian Province on July 22 and 25,2022,the ERA5 reanalysis data from the European Center for Medium Range Weather Prediction(ERMF)(horizontal resolution) and the monitoring data from 16 lightning locators in Fujian Province during the corresponding research period were used to analyze the high altitude environmental background fields and dynamic and thermal fields at different levels(500 hPa,700 hPa,850 hPa).The results showed that both thunderstorms were dominated by dynamic and thermal uplift thunderstorms.On July 25th,the strong convection in the northern region of Fujian Province was mainly affected by thermal factors.The southerly wind carrying the South China Sea water vapor converged in the central part of Fujian Province under the influence of the easterly flow,and the vertically upward warm and humid air flow caused convective movement in the central and southern part of Fujian Province.Secondly,the central region was in a significant shear line,and the combination of thermal and dynamic structures strengthened the development intensity of convection.