2020年11月阿拉善盟大雪天气过程锋面分析  

作　　者：宝乐尔[1] 

机构地区：[1]阿拉善盟气象局,内蒙古阿拉善盟750306

出　　处：《科技创新与应用》2021年第27期92-94,97,共4页Technology Innovation and Application

摘　　要：利用NECP/NCAR再分析资料、常规资料、自动站资料等分析2020年11月20-21日阿拉善盟大雪天气过程的锋面特征。结果表明:随着蒙古地区高压母体中分裂一个高压中心东移南下,其前部冷锋造成阿拉善盟地区降雪天气;此次锋生是热力和动力的共同作用,贺兰山附近锋面呈带状准垂直分布,动力锋生加强次级环流使垂直运动进一步发展,为大雪提供动力条件;偏西通道和西南通道输送水汽,在600hPa至500hPa强烈辐合,为阿拉善盟提供充足的水汽。The frontal characteristics of the heavy snow weather process in Alashan League from November 20 to 21,2020 are analyzed by using NECP/NCAR reanalysis data,conventional data and automatic station data.The results show that as a high pressure center in Mongolia moves eastward and southward,its front cold front causes snow weather in Alashan League region,and this frontogenesis is the combined action of heat and power,and the frontogenesis is zonal quasi-vertical distribution near Helan Mountain.Dynamic frontogenesis strengthens the secondary circulation to further develop the vertical movement and provides dynamic conditions for heavy snow.The western and southwest channels transport water vapor and strongly converge from 600hPa to 500hPa,providing sufficient water vapor for Alashan League.

关 键 词：大雪 冷锋 锋生 次级环流 

分 类 号：P458.12[天文地球—大气科学及气象学]