牡丹江一次暴雪天气成因分析

本文利用常规观测资料及NCEP再分析资料,对2019年11月17-18日牡丹江地区暴雪天气过程进行诊断分析,结果表明:500 hPa高空槽合并发展成东亚大槽带来冷暖气流交汇,高空锋区加强、蒙古气旋和南来海上低压倒槽是产生暴雪的天气特征;通过物理量分析表明,降雪前牡丹江上空有强的水汽输送带,低层辐合高层辐散有利上升运动加强,触发不稳定能量释放,导致暴雪天气的发生。

Analysis of a snowstorm in Mudanjiang

In this paper,the routine observation data and NCEP reanalysis data are used to diagnose and analyze the blizzard process in Mudanjiang region from November 17 to 18,2019.The results show that the merger of the 500hPa high-altitude trough into the East Asia large trough brings the confluence of cooling and heating flows,the strengthening of the high-altitude front,the Mongolian cyclone and the low-pressure downturn trough of the South China Sea are the weather characteristics that produce heavy snow.The physical quantity analysis shows that there is a strong water vapor transport belt over Mudanjiang before the snowfall,and the low convergence and high divergence is beneficial to the enhancement of the ascending motion,triggering the release of unstable energy,leading to the occurrence of blizzard.