Abstract:

Based on the basic observationaldata and automaticweather station data, a regionalheavy dust storm occurred onApril29,2009 inHexiCorridorwas analyzed from the causes of the synopticmeteorology, physics quantity fields and so on.The results show that itwas a duststorm thatcaused by the gale behind the cold front, and ithappened in the zone ofstrong pressure gradient. Groundmeteorological elements had a strong response to the outbreak of the dust storm, which can be used as a reference for forecast of dust storms. Therewas an obvious upwardmotion in the outbreak area ofduststorm with the lower level convergence and the high-leveldivergence. The frontogenesis function and helicity indicated the area of dust storm verywel.l

Key words: dust storm, physical quantity, cold front, diagnostic analysis

摘要：

应用常规和自动加密站观测资料,对2009年4月29日发生在河西走廊的一次区域性强沙尘暴天气过程,从天气学成因、物理量要素等方面进行了诊断分析。结果表明:这是一次冷锋后大风引发的沙尘暴;沙尘暴发生在强气压梯度区;地面气象要素对冷锋过境及沙尘暴爆发有强烈反应,可以在沙尘暴预报中作为一个参考依据;沙尘暴爆发区低层辐合,高层辐散,有明显的上升运动;锋生函数和螺旋度对沙尘暴爆发区有较好的指示意义。

关键词: 沙尘暴, 物理量, 冷锋, 诊断分析