摘要
[目的]探讨本溪地区一次大到暴雪天气过程的形成和发展。[方法]利用常规资料,从天气形势演变、物理量场特点着手,对2009年12月4～5日本溪地区一次大到暴雪天气过程的形成和发展进行了分析。[结果]此次大雪到暴雪天气过程是由高空槽和华北气旋共同影响产生。此次过程中,本溪地区上空高层辐散、低层辐合,低层暖、高层冷;低层西南急流将渤海水汽向本溪所处的辽东地区输送,为降雪提供了很好的水汽条件,但由于上升动力不足,过程雪量未达到暴雪。乌拉尔山高脊的发展在这次降雪过程中起了重要作用,高脊加强北抬时有利于冷空气的南下和高空槽的加深。物理量场的分析对此次过程的起止时间和强度预报起了很好的参考作用。[结论]该研究为以后此类天气的预报提供一些依据。
[Objective] The aim was to study the formation and development of a heavy snow in Benxi area.[Method] Based on conventional meteorological data,the formation and development of a heavy snow in Benxi area from December 4th to 5th in 2009 were analyzed from the aspects of weather situation evolution and physical quantity field feature.[Result] The heavy snow was caused by upper trough and North China cyclone.In this weather process,there was upper level divergence and lower level convergence over Benxi area,and it was warm in low level and cold in high level;southwest jet in low level transported water vapor from Bohai Sea to eastern Liaoning,which provided good water vapor condition for snow,but it did not reach heavy snow due to inadequate ascending force.The development of Ural high ridge played important role in the snow process,the strengthened high ridge moving northward was beneficial to the moving southward of cold air and deepening of upper trough.Analysis on physical quantity field could provide reference for predicting beginning and ending time and strength of heavy snow.[Conclusion] Our study could provide basis for the forecast of heavy snow.
出处
《安徽农业科学》
CAS
北大核心
2011年第11期6605-6607,共3页
Journal of Anhui Agricultural Sciences
关键词
大到暴雪
天气形势
物理量
过程分析
本溪地区
Heavy snow
Weather situation
Physical quantity
Process analysis
Benxi area
