摘要
为了研究内蒙古中西部强沙尘暴发生发展机制,利用常规气象资料及NCEP1°×1°再分析资料,对2017年5月3—4日内蒙古中西部地区一次强沙尘暴天气成因进行分析。结果表明:(1)500 hPa低槽、蒙古气旋和地面冷锋是本次强沙尘暴天气过程的主要影响系统,此次强沙暴过程属于地面冷锋和蒙古气旋共同影响的类型;(2)分析高低层温压场与涡度平流发现,动力因子(涡度平流)和热力因子(温度平流)的共同作用,推动了蒙古气旋的东移发展;(3)垂直螺旋度分布特征是上负下正,表明沙尘区域上空高层为辐散区,有下沉运动,中低层为辐合区,有上升运动。
The aims are to study the occurrence and development mechanism of strong sandstorm in midwestern Inner Mongolia. Based on conventional observation data and NCEP(1°×1°) reanalysis data, the author analyzed the causes of the strong sandstorm process in middle-western Inner Mongolia on May 3-4, 2017. The results showed that:(1) the 500 hPa trough, the Mongolia cyclone and the surface cold front were the main influencing system of the strong sandstorm process which belonged to the common type affected by the surface cold front and the Mongolia cyclone;(2) by analyzing the field of temperature-pressure and vorticity advection,dynamic factor(vorticity advection) and thermal factor(temperature advection) played a significant role in the eastward movement of the Mongolia cyclone;(3) the vertical helicity distribution was characterized by negative at higher levels and positive at lower levels, indicating that the upper and higher layers of the dust region were divergent areas with sinking motion; the middle and low layers were convergence areas with rising motion.
引文
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