| 2009年辽宁省一次暴雪天气过程分析 |
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| 引用本文： | 张炳川,吴晓峰,贾旭轩,陆井龙.2009年辽宁省一次暴雪天气过程分析[J].安徽农业科学,2010,38(12):6275-6278. |
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| 作者姓名： | 张炳川 吴晓峰 贾旭轩 陆井龙 |
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| 作者单位： | 辽宁省气象台,辽宁沈阳,110016 |
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| 摘 要： | 利用NCEP逐日4次再分析资料和常规观测资料,对2009年2月12～13日发生在辽宁的雨转暴雪过程的成因进行了探讨,着重讨论和分析了强雨雪发生所需具备的低空急流条件、温度条件以及水汽与动力的耦合机制。结果表明,低空急流为该次过程提供了充足的水汽供应;低空辐合和高空辐散导致强烈的上升运动,为暴雪的产生提供了动力条件;底层冷空气的楔入是快速雨转雪的主要原因;强降水落区与湿位涡有很好的对应关系。
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| 关 键 词： | 雨转雪 温度平流 湿位涡 |
Analysis of a Heavy Snow Process in Liaoning in 2009 |
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| Institution: | ZHANG Bing-chuan et al(Liaoning Observatory,Shenyang,Liaoning 110016) |
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| Abstract: | Based on the conventional meteorological data and 4 times daily NCEP reanalysis data,the causes of rain changing snowstorm in Liaoning during February 12th-13th of 2009 were discussed.The low-level jet conditions,temperature conditions and coupling mechanism of water vapor and dynamics of heavy snow were diagnosed and analyzed.The low-level jet provided abundant water vapor for this process.The convergence at low level,divergence in the upper troposphere and strong ascend movement provided dynamic conditions for the snowstorm.The wedging of cold air was the chief cause of rain changing snow.The strongprecipitation area corresponded to the moist potential vorticity well. |
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| Keywords: | Rain changing snow Temperature advection Moist potential vorticity |
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