沈阳桃仙国际机场一次暴雪过程分析

Analysis on A Snowstorm in Shenyang Taoxian International Airport

利用常规观测资料,结合分析大气环流及各层物理量特征基础上,对2010年3月19～20日沈阳地区暴雪过程,进行天气动力学分析。结果表明:在东北地区特定的马蹄形地形条件下,容易形成中低层下沉气流,抬升上升气流与高层冷空气形成不稳定大气层结,高层强辐散的抽吸效用对暴雪的形成起到了重要作用;气旋入海后迅速加深形成的准暴发性气旋对水汽的阻挡是此次降雪形成的主因。暴雪的水汽来源于黄海和渤海,沈阳上空的湿位涡区与暴雪有密切关系。

By using conventional observed data,and combined with analysis of atmospheric circulation and physical quantity characteristics,a snowstorm process in Shenyang area during Mar.19th-20th,2010 was analyzed.The results showed that under the northeast area specific U-shape topographical condition,it is easy to form the underlying bed submersion air current,the lifting ascendant current and the high-level cold air forms the rough atmosphere stratification,the high-level strong divergence disperse suction plays important role in snowstorm formation;and the hindering of accurate paroxysmal cyclone to water vapor was the main reason for the snow formation.The snowstorm water vapor originated from Yellow Sea and Bohai Sea,Shenyang sky moist potential vorticity had the close relationship with the snowstorm.