1998年4月14～15日强沙尘暴过程分析

Analyses on Severe Dust Storm Process During April 14 and 15, 1998

利用卫星云图 ,数值预报产品以及常规气象资料对 1998年 4月 14～ 15日发生在我国西部地区的沙尘暴天气进行了分析 ,指出本次过程发生在大气环流形势调整过程中 ,是由斜压槽及冷锋触发的。也重点分析了两个强沙尘暴中心的成因 ,发现第一个强沙尘暴区是由加强的冷锋云带造成的 ,而第二个强沙尘暴区是由三条云带共同作用造成的。强沙尘暴区位于高空急流出口区右侧、5 0 0hPa正涡度中心下风方和次级反环流的上升区内。并用动力气象学原理做了初步讨论 。

Using satellite cloud images, numerical forecasting products and regular meteorological data, the dust storm weather occurred in western China during April 14 and 15, 1998. It found that this process occurred in the atmospheric circulation situation adjusting process and it caused baroclince trough and cold frond. And we mainly analysed the cause of formation of two severe dust storm centers, found that the first severe dust storm area caused by strengthened cold frond cloud band, while the second one was by 3 cloud bands together. The severe dust storm area was in the right side of upper air jet stream exit area, and in the downwind of 500 hPa positive vortex center and the ascending area of secondary counter circulation. Also we take a primary discussing by dynamical meteorology principle, and provide new evidence for forecasting.