2021年春季鄂尔多斯市一次强沙尘暴天气分析

Analysis of A Strong Sandstorm Weather in Ordos City in Spring 2021

利用卫星遥感监测2021年春季一次强沙尘暴天气,针对此次强沙尘暴过程的环流特征、边界层、物理量和沙源地进行分析总结。结果表明:前期无降水且气温异常偏高,地面解冻回暖,裸露地表土质疏松;500 hPa低槽、地面气旋和冷高压、地面冷锋是引起此次强沙尘暴的重要天气系统;午后气温日变化造成冷锋移至河套地区产生强烈锋生是造成此次沙尘暴的主要原因;强上升运动和动量下传为强沙尘暴的形成与发展提供了必要的动力条件。

A strong sandstorm in spring 2021 was monitored using satellite remote sensing,and the circulation characteristics,boundary layer,physical quantities,and sand source areas of this strong sandstorm process were analyzed and summarized.The results indicate that there was no precipitation in the early stage and the temperature was abnormally high,causing the ground to thaw and warm up,and the exposed surface soil to become loose.The 500 hPa trough,surface cyclones,cold high pressure,and surface cold front are important weather systems that caused this severe sandstorm.The main reason for this sandstorm is the strong frontogenesis caused by the daily temperature change in the afternoon,which caused the cold front to move to the Hetao area.The strong upward motion and momentum downward transmission provide necessary driving conditions for the formation and development of strong sandstorms.