| 一次低空急流影响下滇西地区冬季强降水天气分析 |
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| 引用本文： | 高月忠,李庆红,董保举,黄慧君.一次低空急流影响下滇西地区冬季强降水天气分析[J].云南大学学报(自然科学版),2011(Z1). |
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| 作者姓名： | 高月忠 李庆红 董保举 黄慧君 |
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| 作者单位： | 云南大学大气科系;云南省大理州气象局;云南省大理市气象局; |
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| 摘 要： | 利用常规观测资料和大理边界层风廓线资料,对2008年1月26～27日低空急流影响下滇西地区冬季强降水天气进行分析.结果表明:南支槽是主要影响系统,槽前的西南低空急流一方面为强降水区输送源源不断的暖湿空气,另一方面在暴雨区产生强辐合,强降水发生在水汽通量散度小于-20×10-8 g.hPa-1.cm-2.s-1的区域,水汽辐合与辐散相伴出现,强降水落区与水汽通量大值区及全风速大值区有很好的对应关系.低空急流出现最强时低层辐合、高层辐散及垂直速度也达到最强;高低空急流的脉动对强降水有一定的指示意义,低空急流的脉动与强降水之间存在密切关系,高空急流较低空急流的下传明显提前2～3 h,低空西南急流向下扩展的同时,可能存在动量下传,引起低空扰动加强.
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| 关 键 词： | 冬季强降水 南支槽 低空急流 风廓线 |
Analysis of winter strong precipitation in western Yunnan Province under the influence of a low level jet |
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| GAO Yue-zhong,LI Qing-hong,DONG Bao-ju,HUANG Hui-jun.Analysis of winter strong precipitation in western Yunnan Province under the influence of a low level jet[J].Journal of Yunnan University(Natural Sciences),2011(Z1). |
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| Authors: | GAO Yue-zhong LI Qing-hong DONG Bao-ju HUANG Hui-jun |
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| Institution: | GAO Yue-zhong1,2,LI Qing-hong2,DONG Bao-ju1,3,HUANG Hui-jun2(1.Department of Atmospheric Science,Yunnan University,Kunming 650091,China,2.Meteorological Bureau of Dali Prefecture,Dali 671000,3.Meteorological Bureau of Dali City,Dali 671003,China) |
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| Abstract: | Based on observational data and wind profile data of boundary layer in Dali,we analyze winter strong precipitation in western Yunnan Province under the influence of a low altitude jet stream in January 26th and 27th of 2008,the results show that the southern branch trough is the main influencing system.The southwestern low level jet in front of the trough continuingly transferred warm and moisture air to the precipitation area and it formed a convergence and heavy precipitation in the area where the moistur... |
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| Keywords: | winter strong precipitation southern branch trough low level jet wind profile |
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