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北疆暴雪过程的湿位涡诊断
引用本文:李如琦,唐冶,路光辉,赵克明,牟欢,陈斌.北疆暴雪过程的湿位涡诊断[J].新疆气象,2013,7(5):1-6.
作者姓名:李如琦  唐冶  路光辉  赵克明  牟欢  陈斌
作者单位:新疆气象台,新疆气象台,乌鲁木齐市气象局,新疆气象台,新疆气象台,新疆气象台
基金项目:科技部公益性行业(气象)科研专项(GYHY201106007)
摘    要:利用NCEP1°×1°再分析资料,对2009年3月19—20日北疆沿天山一带一次暴雪天气过程进行诊断分析,着重探讨了湿位涡诊断在新疆暴雪预报中的应用。分析表明:暴雪的水汽输送有3个源地,低层负散度、向北倾斜的涡度“上负下正”分布、等θe线的陡立密集带、垂直速度负值区与暴雪落区均有较好的对应关系。暴雪主要发生在MPV1〉0、MPV2绝对值迅速增加且等值线密集分布的区域。MPV1下传增大,大气对流不稳定能量释放,低层MPV2绝对值增大,大气湿斜压性增强,下滑倾斜涡度增长是暴雪形成的重要原因。

关 键 词:暴雪  水汽输送  动力抬升  湿位涡  下滑倾斜涡度增长(SVD)
收稿时间:9/9/2011 12:00:00 AM
修稿时间:2013/5/30 0:00:00

Analysis of Moist Potential Vorticity to a Snowstorm Process in Northern Xinjiang
LI Ru-qi,TANG Ye,LU Guang-hui,ZHAO Ke-ming,MU Huan and CHEN Bin.Analysis of Moist Potential Vorticity to a Snowstorm Process in Northern Xinjiang[J].Bimonthly of Xinjiang Meteorology,2013,7(5):1-6.
Authors:LI Ru-qi  TANG Ye  LU Guang-hui  ZHAO Ke-ming  MU Huan and CHEN Bin
Institution:Xinjiang Meteorological Observatory,Xinjiang Meteorological Observatory,Urumqi Meteorological bureau,Xinjiang Meteorological Observatory,Xinjiang Meteorological Observatory,Xinjiang Meteorological Observatory
Abstract:Using the NCEP 1°×1° reanalysis data, a snowstorm in northern Xinjiang from March 19 to 20 in 2009 was analyzed, and the application of wet potential vorticity was discussed specially. The results showed that there are 3 vapor source of snowstorm, and there are obvious relationship between negative divergence in lower layers, northward inclined vorticity distribution present a up negative and down positive appearance, equivalent potential temperature rise steeply intensive belt, rise velocity area and the falling area of snowstorm. This snowstorm occurred in a area of MPV1 positive and amplify distinctly, and absolute value mushroom and isoline intensive area of MPV2. MPV1 amplify down and atmosphere convective instability energy release. Absolute value of MPV2 at low level magnify and atmosphere wet baroclinicity enhance. It is a important reason that the development of down-sliding slantwise vorticity for the snowstorm formation.
Keywords:snowstorm  vapor transport  dynamic lifting  moist potential vorticity  SVD
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