一次快速发展气旋导致的沙尘暴天气过程的初步分析

A Primary Analysis on a Sandstorm Process Caused by the Cyclone in Fast Development

文章概述了我国北方地区春季沙尘天气的特征,并对影响沙尘暴的天气气候背景、单站地面气象要素、环流形势、冷空气的强度及影响路径、沙尘暴的起沙源地、影响时间和范围等进行了分析。结果表明:此过程是蒙古气旋强烈发展所致。巴丹吉林沙漠和浑善达克沙地是沙尘暴的主要沙尘源区;蒙古气旋的爆发性发展和冷锋后大风是起沙的主要动力;在高空急流出口区左侧,气流辐散强迫形成干对流上升气流,该上升气流与湍流输送是沙尘向高空输送的动力机制。

This article outlined the observational features of the sandstorm of spring in north China.The sandstorm process was analyzed by the weather and climate background,the weather factors at a surface？station,circulation types,the intensity and tracks of the cold air,sources of sandstorm,affecting？time and areas of the process.It is shown that the process was caused by the Mongolia cyclone in fast development.The main sources located in the Badain Juran Desert and the Hunshandak Sandland.The primary impetus for the dust emission came from the Mongolia cyclone in the fast development and the clod advection behind the cold front.The upward air current in dry convection was caused by the divergent flow of the left side of the exit of upper jet streams,and the upward air current and turbulent transfers were the main mechanism.