和田地区2006年春季一次区域性寒潮天气过程分析

Analysis on a Cold Wave Process in 2006 Spring in Hotian Area

2006年4月9日20时开始,和田地区自西向东出现了强沙尘暴、寒潮天气过程。本文从天气形势、单站要素、动力诊断等方面,对此次天气进行分析,结果表明:主导系统乌拉尔山高压脊发展和天气尺度影响系统西伯利亚低槽的加深是造成这次天气过程的主要原因,而本地区中尺度热低压的生成、发展对强沙尘暴的突发有较强的激发作用;此次强沙尘暴出现在高空急流轴右侧,正涡度和负温度平流中心下风方等涡度和等温度平流线梯度较大处,低层辐合高层辐散强烈上升气流区。应用ECMWF数值预报产品对此次天气提前3d作出了准确及时的预报和服务,体现了数值预报的优点。

The strong sandstorm and cold wave weather process were occurred from the west toward the east in Hetian area during Apr. 9-11, 2006. This tractate carries out analysis on the aspects of weather process, such as the synoptic situation, the main elements of each station and the dynamic diagnostics etc.. The result indicated： as a predominant system, Ural mountain high pressure ridge developed and as a synoptic scale influence system, Siberia trough deepens to be the main reason for this weather process. But the hot low-pressure of medium scale born and developed in native area to be the inspired effect for abrupt starboard of jet stream axis at upper strong sandstorm. This strong sandstorm appeared air, the positive vorticity, and the leeward of n in the egative temperature advection centre and the area of stronger updraft with low layer convergence and high layer divergence. Applying ECMWF numerical forecast product for this weather process, the forecast and service of this weather were made accurately and duly ahead 3 days, in the person of the excellence to numerical forecast.