锡林郭勒盟一次槽涡型大雪天气过程分析  

Analysis ona “Groove Vortex Type” Heavy Snow Weather Process

作　　者：任素芳 艳萍 郝艳霞 刘志刚 

机构地区：[1]锡林郭勒盟气象局,内蒙古锡林浩特026000

出　　处：《内蒙古气象》2013年第4期12-14,共3页Meteorology Journal of Inner Mongolia

摘　　要：利用高空、地面形势场和物理量场等气象资料,对2011年2月26日锡林郭勒盟地区出现的大雪天气过程诊断分析。结果表明:这次大雪是在稳定的行星尺度天气系统作用下,受低空切变线配合河套气旋影响,满足了高低空急流耦合提供的动力抬升、低空急流建立的水汽输送及辐合、低层暖湿气流产生的能量不稳定等条件下产生的,属弱冷空气类槽涡型;西南涡(槽)和华北脊对大雪的产生和落区起到重要的决定作用,低层强盛的暖湿气团为不稳定能量的产生提供了条件;通过分析、总结,结合实际预报经验,提出了预报要点和指标。Using the meteorological data of high-altitude, ground situation field, physical quantity field to analyze the heavy snow weather process on February 26, 2011 in Xilinguole League. The results showed that the heavy snow weather process was under the effect of stable planetary scale weather system and the influence of low-level shear line with the Hetao cyclone, meanwhile, the heavy snow weather process satisfies the conditions of the impetus lifting that offered by High and low level jet coupling, the moisture trans- port and convergence that established by low level jet and the unstable energy that generated by low-level warm jet, and so on, it be- long to a trough vortex-type of weak cold air class. Southwest Vortex and Northern ridge play an important role in the snow forming and the failing area. The warm and wet air mass offered the condition for the producing of unstable energy. Through analysis, summary and combining practical forecast experience made a main prediction point and indexes.

关 键 词：大雪 环流形势 物理量场 高低空急流 

分 类 号：P458.121[天文地球—大气科学及气象学]