J4 ›› 2009, Vol. 27 ›› Issue (4): 362-366.

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Diagnosis of a Sandstorm W eather Event in the South of Junggar Basin

 DIAO Dun-Rong1, LIU Zhen-Xin2   

  1. (1.ShiheziMeteorologicalBureau,Shihezi832000, China;2. UrumqiMeteorologicalBureau,Urumqi830000,China)
  • Received:2009-08-25 Revised:2009-11-06 Online:2010-12-30 Published:2009-12-30

准噶尔盆地南缘一次强沙尘暴成因分析

赵俊荣刘振新   

  1. (1.新疆石河子地区气象局,新疆 石河子 832000; 2.新疆乌鲁木齐市气象局,新疆 乌鲁木齐 830000)
  • 作者简介:赵俊荣(1962-),女,河南西平人,高级工程师,现从事短期天气预报及研究工作.E-mai:l xj_zjr070907@ 163. com   
  • 基金资助:

    新疆气象局科研基金项目“准葛尔盆地南缘沙尘暴天气的分析与预报”(yx200914)资助
      

Abstract:

Based on the data ofbasic observation and numerical forecasting productT639, the causes ofa sandstorm weatherprocess occurred on April13, 2009 in the south of JunggarBasin were analyzed. The results show itwas caused by the north-west strong cold air. The continual temperature rising provided the favorable thermal condition for sandstorm, and theWestSiberian cold troughmoving towards southeastand developing greatly provided the dynamical condition for it. The vertical structure ofSiberian cold trough provided themechanism ofmomentum transmitting downwards for sandstorm. The upper and lower level jet stream made the frontal zone at the middle and lower troposphere strengthen and atmospheric stratification unstable, which provided a favorable large-scale circulation environment. The development and persistence ofdry-warmer tonguewas an omen for its occurrence. The strong sandstorm occurred in the rear of the cold front, the frontof the cold high pressure and the airflow divergence zone. Moreover, the special terrain also provided a favorable geographical condition.

Key words: the south of JunggarBasin, strong sandstorm, dry-warm tongue, downwardmomentum transportation

摘要:

利用常规观测资料和T639 0场预报资料,对2009年4月13日发生在准噶尔盆地南缘石河子垦区一次强沙尘暴进行了天气成因分析。结果表明,这次强沙尘暴是西北路径较强冷空气引发的锋后偏西大风沙尘暴天气过程。前期持续高温少雨为沙尘暴的发生提供了利的热力条件和一定的物质基础。西西伯利亚冷槽的斜压性结构使其强烈发展,为沙尘暴的发生提供了动力条件。而西西伯利亚冷槽的垂直结构强迫出一支下沉气流,为沙尘暴的发生提供了动量下传机制。高低空急流导致对流层中下部锋区加强和大气层结不稳定,为沙尘暴的产生提供了有利的中尺度条件。干暖舌的形成和维持对沙尘暴的发生以及落区有很好的指示性。沙尘暴发生在地面冷锋后部、冷高压前部以及3 h变压、变温最大处和低空气流辐散的地区。准噶尔盆地南缘的特殊地形和流沙为沙尘暴形成提供了有利的地理环境。

关键词: 准噶尔盆地南缘, 强沙尘暴, 干暖舌, 动量下传

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