蒙古气旋引发的一次山西沙尘天气分析

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利用常规气象观测资料和NECP再分析资料,对2013年3月9日出现在山西的沙尘天气进行了分析。结果表明:①前期降水偏少、气温偏高是此次沙尘天气发生的有利背景,蒙古气旋、冷锋、副冷锋是此次沙尘天气的主要影响系统。②地面3h变压的正的大值区和强的阵风发生区域有很好的对应关系。③500hPa的水平螺旋度正值对地面气旋的移动有指示意义;沙尘天气出现在500hPa水平螺旋度正值范围偏西、偏西南区域。④300hPa以上的高空急流为双急流型,急流中心风速相对较小、垂直运动相对较弱以及混合层高度相对较低是没有发生大范围沙
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