2001年4月8日宁夏强沙尘暴天气中尺度系统分析

A Meso-scale Analysis on a Severe Sandstorm

对2001年4月8日宁夏出现的一次强沙尘暴过程进行了天气背景及中尺度天气学分析。根据不同地区出现大风的时间差异,讨论了地形对冷锋和沙尘暴运动的影响;利用非静力平衡中尺度数值预报模式MM5的导出量,通过宁夏精细化预报物理量分析子系统,计算、分析了这次过程中Q矢量、锋生函数及总温度的变化特征。结果表明:MM5数值模式输出产品与本次沙尘暴过程天气实况有较好的对应关系及预报指示意义。

The circulation and meso-scale synoptic analysis was conducted on a severe sandstorm event on April 8,2001.The topographic effect on the cold front and the features of sandstorm movement are discussed.Using MM5 products,non-geostropic Q vector,frontogenesis and total temperature were calculated and analyzed,and results show that all the indices above had notable relation with the observations during this sandstorm event.