2019年1月底盐城市暴雪成因分析

Cause Analysis of Blizzard in Yancheng City at the end of January 2019

利用常规气象观测资料和数据再分析资料对2019年1月30—2月1日盐城暴雪形成过程和原因进行分析,结果表明:此次暴雪大环流背景是500 hPa乌拉尔山阻塞高压较为稳定和中高纬度地区多个短波槽东进且同位叠加,降雪过程有持续时间较长,降雪量大、积雪深的特点。高空急流在低空西南急流形成前便已存在,高空急流轴南压使得低空急流北上,高低空急流耦合激发了次级环流圈形成和发展,其上升支为暴雪提供了充分动力抬升作用。

this paper uses conventional meteorological observation data and data reanalysis data to analyze the formation process and causes of Yancheng Blizzard from January 30 to February 1,2019.According to the results,the large circulation background of the blizzard is that the blocking high pressure of the Ural Mountains is relatively stable hpa 500,and many short wave troughs in the middle and high latitudes advance eastward and are superimposed in the same position.The snowfall process has a long duration,large amount of snow,deep snow characteristics.The upper jet stream existed before the formation of the low-level southwest jet stream.The upper jet axis south pressure makes the low-level jet go north,and the coupling of the high and low-level jet stimulates the formation and development of the secondary circulation circle.snow provides sufficient dynamic lifting effect.