2019年春季一次强沙尘暴天气过程分析

Analysis on the weather process of a strong sandstorm in spring of 2019

根据常规观测资料对2019年5月15日锡林郭勒盟(简称锡盟)北部地区出现的一次大风、沙尘暴天气进行分析。结果表明:此次过程沙尘天气主要由高空冷槽和地面蒙古气旋共同作用形成;高空急流是此次过程的主要动力条件。低层大气极为干燥及下垫面干燥高热的性质为此次沙尘天气提供有利热力和不稳定条件。

Based on the conventional observation data,a gale and sandstorm occurred in the northern part of Xilingol League on May 15,2019(Xilingol League for short)was analyzed.The results show that the dust weather is mainly formed by the joint action of the upper cold trough and the surface Mongolian cyclone.The upper jet stream is the main dynamic condition for this process.The extremely dry lower atmosphere and the dry and hot underlying surface provide favorable thermal and unstable conditions for the dust weather.