J4 ›› 2011, Vol. 29 ›› Issue (1): 82-87.

• 论文 • 上一篇    下一篇

2009年河北省初冬暴雪天气过程的诊断分析

时青格1,2周须文1
  

  1. 1.河北省气象科技服务中心,河北石家庄050021; 2.兰州大学大气科学学院,甘肃兰州730000
  • 收稿日期:2010-08-24 修回日期:2010-10-25 出版日期:2011-03-31 发布日期:2011-03-31
  • 作者简介:时青格(1975-),女,河北人,工程师,从事中短期天气预报及研究.E-mail:sqgzxc@sohu.com
  • 基金资助:

    河北省气象局科研开发项目(10ky12)资助

Diagnostic Analysis of a Snowstorm Occurred in Early Winter of 2009 in Hebei Province

SHI Qingge1,2,ZHOU Xuwen1   

  1. 1.Meteorological Science and Technology Service Center of Hebei Province,Shijiazhuang 050021,China;
    2.College of Atmospheric Sciences,Lanzhou University,Lanzhou 730000,China
  • Received:2010-08-24 Revised:2010-10-25 Online:2011-03-31 Published:2011-03-31

摘要:

2009年11月10~12日河北省出现了近50 a来最强的一次持续暴雪天气过程,给该地人民生活、生产造成一些不利影响。通过分析暴雪发生时的大尺度天气环流,探讨形成这次极端天气物理机制。结果表明,这次暴雪天气是在高空纬向环流形势稳定,700 hPa切变线长时间维持,低空西南气流源源不断地从海上输送暖湿空气使得该地的水汽含量不断升高,850 hPa到地面的东北风回流的冷空气等共同影响造成。诊断分析结果进一步表明,降雪期间高空辐散低层辐合、中低层存在较强的垂直上升运动、暖空气被冷空气抬升是暴雪发生的动力机制。

关键词: 暴雪, 切变线, 垂直速度, 水汽, 河北省

Abstract:

A continuous snowstorm occurred on November 10 to 12,2009 in Hebei Province,which was the most serious in recent 50years.The objective of this study is to explore the possible mechanism responsible for this extreme weather event by analysis the large scale atmospheric circulation.The results show that the snowstorm occurred under weather conditions of the stable zonal circulation at high level,700 hPa shear line maintaining a long time,the abandant vapour coming from the southwest warm and humid airstream at the lower layer,the northeasterly cold air return from 850 hPa to the ground.The divergence at high level and convergence at low level,the strong ascending motion and the warm air forced to lift by cold air were the important dynamic mechanism of this weather event.

Key words: snowstorm, shear line, vertical velocity, vapor, Hebei Province

中图分类号: