刘开宇, 申红喜, 成永勤, 梁爱民, 张媛. 贵阳机场冷锋型低空风切变的合成分析[J]. 云南大学学报(自然科学版), 2011, 33(S2): 392-396.
引用本文: 刘开宇, 申红喜, 成永勤, 梁爱民, 张媛. 贵阳机场冷锋型低空风切变的合成分析[J]. 云南大学学报(自然科学版), 2011, 33(S2): 392-396.
A compositive analysis of the cold front windshear of Guiyang airport[J]. Journal of Yunnan University: Natural Sciences Edition, 2011, 33(S2): 392-396.
Citation: A compositive analysis of the cold front windshear of Guiyang airport[J]. Journal of Yunnan University: Natural Sciences Edition, 2011, 33(S2): 392-396.

贵阳机场冷锋型低空风切变的合成分析

A compositive analysis of the cold front windshear of Guiyang airport

  • 摘要: 利用常规气象资料和飞机报告,以天气演变过程相似为依据,在普查的基础上,选取产生贵阳机场冷锋型低空风切变的9个典型个例进行合成和物理量的诊断分析.结果表明:切变线和南下冷锋是产生该型低空风切变的主要原因;低空急流输送的暖湿空气使气层增温、增湿,温度因子使气流扰动加剧;高层高位势涡度的扰动下传导致高空动量下传,也造成低层扰动增大;锋区两侧冷暖平流的分布特征使其两侧风速差加大,当锋面过境影响时,狭窄的过渡锋区使风出现急剧变化,从而易于产生风切变;低空风切变发生前其上游中低层多波动,低层存在风向风速的切变.

     

    Abstract: Using the meterological datas and the airplane reports,and on the basis of the same weather evolvement,the article chose 9 examples of cold front of Guiyang to composite and diagnosis analysis of physics element.The result shows that:the shear line and cold front are the main reason that cause the windshear.The warm and wet air that transported by the low-level jet cause the humidity and temperature add.The temperature cause the turbulence enhance,high PV spreads downward from the upper cause momentum of upper spread downward,and enhance the turbulence of low-level.The distribute characteristic of the cold and warm advection of the front area add the differentials of speed.When the front moves,the narrow front area cause wind change,so it is the reason that cause windshear.There are many wave at the low-middle level,and there are speed windshear at the low-level.

     

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