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利用实况观测资料和常规气象资料对2011年4月28日午后发生在哈密地区的沙尘天气进行分析,得出:500hPa强斜压槽是此次沙尘天气的主要影响系统,系统深厚、移动缓慢使得沙尘天气持续时间较长;高原到新疆的低层暖高压是沙尘天气发生的有利不稳定条件;强沙尘暴主要出现在地面冷锋前后气压梯度区,地面3h变压对研究沙尘天气发展路径有重要的指示作用;散度场表现为高空辐散、低层辐合的配置,垂直速度则存在有数值较大的负中心,上升运动强烈,这些因素导致大气层结极不稳定,为大风、沙尘天气发生发展提供了有力的动力条件。
Based on the observation data and routine meteorological data, the dust weather in Hami area on the afternoon of April 28, 2011 was analyzed. The results showed that the 500hPa strong pressure gutter was the main impact system of the dust weather and the system was deep and mobile The sandstorm weather lasted slowly for a long time. The low altitude warm pressure from plateau to Xinjiang was the favorable unstable condition for dust weather. The strong sandstorm mainly appeared in the pressure gradient area before and after the cold front of the ground. The divergence field is characterized by high-altitude divergence and low-level convergence. The vertical velocities have large negative centers and strong upward movements. These factors lead to extremely unstable atmospheric storms, The development of dust weather provides a powerful driving force.