Journal of Arid Meteorology

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Comparative Analysis of Two Severe Sandstorm Events in Gansu

DI XiaohongZHANG XinrongLIU XinweiSHA Honge   

  1.  Lanzhou Central Meteorological Observatory,Lanzhou 730020,China
  • Online:2014-03-03 Published:2014-03-03

甘肃省两次强沙尘暴天气对比分析

狄潇泓张新荣刘新伟沙宏娥   

  1. 兰州中心气象台, 甘肃 兰州 730020
  • 作者简介:狄潇泓(1975-),女,甘肃兰州人,高工,主要从事中短期天气预报工作.E-mail:xhdi@sohu.com
  • 基金资助:

    中国气象局小型业务建设项目“环境大气污染”资助

Abstract:

Based on the basic observations and automatic hourly data as well as the initial field of numerical prediction of T639, two typical severe sand storm weather processes which occurred on March 19, 2010 and April 28, 2011 in Gansu were analyzed by using the synoptic and climate diagnostic methods from aspects of the circulation situation,and single station ground meteorological elements,jet stream,vertical speed,stability and so on. The results show before the two sanstorm processes there were nearly similar climatic backgrounds with higher temperature and less precipitation. The circulation patterns of the two sanstorm processes were baroclinic trough and strong front zone at the upper level,strong cold high pressure on surface layer and Mongolia cyclone ahead of front or thermal low. The configuration of high and low air jet and the evolution of surface meteorological elements had some some indication to sandstorm weathers. But because of difference of path and intensity of cold air during the two sandstorm process,the influences were also different.

Key words: sandstorm, baroclinic trough, jet, diagnosis

摘要:

利用常规观测资料、自动站逐时资料及T639数值预报初始场,对2010年3月19日、2011年4月28日甘肃省2次强沙尘暴天气过程从天气概况、气候背景、环流形势及单站地面气象要素、高空急流、垂直速度、稳定度等方面进行深入分析。结果表明:2次过程前期均具有气温偏高降水稀少的的气候背景;高空斜压槽和强锋区、地面强冷高压和锋前蒙古气旋或热低压是发生此类强沙尘暴的环流形势;高低空急流配置和地面气象要素演变对沙尘暴天气有指示意义;由于2次过程冷空气路径强度有所差异,因此对甘肃造成的影响不同。

 

关键词: 沙尘暴, 斜压槽, 高空急流, 诊断分析

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