贵州一次春季飑线天气的综合分析

Comprehensive Analysis of a Spring Squall Line Weather in Guizhou

摘要: 本文利用卫星、雷达、高空及地面常规观测资料、ERA5再分析资料对2022年5月9日贵州一次春季飑线天气进行了综合分析，研究表明：此次飑线天气初发于高湿高能的暖区，边界层辐合线及中层弱冷平流的入侵共同触发了对流天气的产生；此次飑线天气的移动方向与700 hPa上的引导气流方向一致，而移动速度则受到中层气流(700 hPa~500 hPa)的合成影响；通过对较大范围内冷平流的溯源发现，此次飑线天气并无明显的锋生特征，近地面强冷平流并非触发此次飑线天气的关键因素，而上游地区高空槽及切变线后部的偏北气流所携带的弱冷平流是触发对流天气的关键因素之一。

Abstract: A spring squall line weather happened on May 9,2022 in Guizhou was comprehensively analyzed by using satellite, radar, upper air and ground observation data and ERA5 reanalysis data. The study shows that the squall line weather began in the high humidity and high energy warm area. THE boundary layer convergence line and weak cold advection of middle layer trigger the generation of convection weather together. The squall line weather moved in the same direction as the guiding flow on 700 hPa. The move speed of squall line is affected by the middle layer air flow (700 hPa~500 hPa); through the tracing of cold advection in a large scope. The squall line weather does not have the obvious frontogenesis characteristics, the strong cold advection near ground is not a key factor in triggering the squall line. The weak cold advection carried by the northerly airflow behind the trough and shear line in the upstream area is one of the key factors triggering the convection weather.