克州地区春季一次强风沙天气成因分析

利用常规观测资料、数值预报物理量场和NCEP/NCAR每日4次全球再分析网格点资料,对2010年03月28日发生在克州境内的一场罕见大风、沙尘暴天气过程进行了诊断分析，探讨了这次强风沙天气的成因，结果表明：高空低压槽和地面冷锋及锋后强冷平流、高空急流的加强及高空形成的次级环流使高空动量有效下传到地面起到了积极的动能作用，大风沙尘上空螺旋度上负下正的垂直分布与大风沙尘的出现有很好的对应关系，大风沙尘发生前后压、温、湿要素出现的剧烈突变对预报也有很好的指示意义。

An Analysis of a Strong Wind in Kezhou Area

As a new type of atmospheric detecting instrument, the Microwave Radiometer MP-3000A is capable of detecting temperature, relative humidity and water vapor and liquid water profile with high resolution from ground to 10 km altitude. Based on the Microwave Radiometer observation data on May 1, 2011, this paper presents the variation of vapor density and liquid water content before and after the precipitation. The findings show that precipitation was closely correlated with water vapor density and liquid water content. And atmospheric precipitable water generally remained 25mm. The possibility of precipitation increases when atmospheric precipitable water value was over 50mm and liquid water content increases significantly. Precipitation happened within two to three hours when liquid water content did not fall back to 0.0mm after precipitation. Therefore, the study of atmospheric water vapor density and liquid water content detected by microwave radiometer will help improve the precision of short-term forecasting and nowcasting.