河套地区一次寒潮强降雪过程环流形势及物理成因分析  

Analysis of Circulation Situation and Physical Cause of a Cold Wave Process with Heavy Snowfall in Hetao District

作　　者：何建业 杨铁钢 张连霞[3] 

机构地区：[1]乌拉特前旗气象局,内蒙古乌拉特前旗014400 [2]乌拉特中旗气象局,内蒙古乌拉特中旗015300 [3]巴彦淖尔市气象局,内蒙古巴彦淖尔015000

出　　处：《内蒙古气象》2010年第2期6-8,共3页Meteorology Journal of Inner Mongolia

摘　　要：运用常规气象观测资料,对2007年12月25—29日发生在河套地区的1次寒潮、强降雪天气过程进行诊断分析。结果表明:高空横槽转竖,直接促使寒潮爆发;500hPa冷中心强度达-44℃、地面冷高压中心强度达到1060.0hPa是寒潮爆发的必要条件;高空切变线与地面倒槽是此次降雪的主要影响系统;西南气流形成的水汽通道,为此次降雪提供了较好的水汽条件。The diagnostic analysis of cold wave weather process with heavy snowfall,which occurred in Hetao district on 25-29 December in 2007,was conducted using routine meteorological data.Results showed that outbreak of the cold wave was attributed by the conversion of high-level horizontal trough to vertical one.It was also required conditions for the outbreak of cold wave that the intensity of coldest center should be below-44 ℃ on 500 hPa synoptic map and intensity of coldest high center should be 1060.0hPa on surface.The synoptic effecting system of the snowfall mainly included high air shear line and inverse surface trough.The water vapor channel that formed by southwest air current provided better condition for the snowfall.

关 键 词：河套地区 寒潮 降雪 环流形势 物理成因 诊断分析 

分 类 号：P458.121[天文地球—大气科学及气象学]