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中国沙漠 ›› 2007, Vol. 27 ›› Issue (4): 668-671.

• 天气与气候 • 上一篇    下一篇

民勤一次沙尘暴天气过程的稳定度分析

岳 平1,2,3, 牛生杰2, 张 强1   

  1. 1.中国气象局兰州干旱气象研究所/甘肃省(中国气象局)干旱气候变化与减灾重点(开放)实验室, 甘肃 兰州 730020; 2.南京信息工程大学气象灾害国家重点实验室培育点, 江苏 南京 210044; 3.张掖国家气候观象台, 甘肃 张掖 734000
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2007-07-20 发布日期:2007-07-20

Analysis on Stability of A Sand-dust Storm Weather in Minqin Station

YUE Ping1,2,3, NIU Sheng-jie2, ZHANG Qiang1   

  1. 1.Gansu Province & China Meteorological Administration Key Laboratory of Arid Climatic Changes and Disaster Reduction; Lanzhou Institute of Arid Meteorology, China Meteorological Administration, Lanzhou 730020, China; 2.Key Laboratory of Meteorological Disaster, Nanjing University of Information Science & Technology, Nanjing 210044, China; 3.National Climate Observatory of Zhangye, Zhangye 734000, Gansu, China
  • Received:1900-01-01 Revised:1900-01-01 Online:2007-07-20 Published:2007-07-20

摘要: 用2004年5月23—24日民勤基准气象站发生的一次沙尘暴天气过程加密探测,对大气热力参数“3 θ”和动力参数“相对风暴螺旋度”进行了计算和分析。结果表明:沙尘暴来临前到沙尘暴过境的前半期,大气温湿结构的分布有利于沙尘暴的发生、发展;沙尘暴过境的后期,大气层结调整到稳定状态,抑制了干对流的发展;沙尘暴天气结束后整层大气湿度增大,并出现了小雨天气。沙尘暴期间相对风暴螺旋度值小于雷暴等强烈湿对流的临界值,但仍然与沙尘暴的强度有很好的对应关系。

关键词: 沙尘暴, 稳定度, 相对风暴螺旋度, 大气层结

Abstract: Based on the high detective data on May 23 to 24 of 2004 over Minqin base station in Hexi corridor of Gansu province, the atmospheric thermal parameter “3θ” and the dynamic parameter “relative storm helicity” were analyzed. The results showed that the atmospheric stratification was hot and dry before the sand-dust storm, which was advantageous to the forming and development of sand-dust storm; the atmospheric stratification was cold and wet at the end of sand-dust storm, which limited the development of dry convection; after the sand-dust storm weather, the atmospheric humidity remarkably increased and even rained slightly. The value of relative storm helicity during sand-dust storm period was smaller than that during thunderstorm and others the intense wet convection weather systems, but it still has close corresponding relation with the sand-dust storm intensity.

Key words: sand-dust storm, stability, relative storm helicity, atmospheric stratification

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