2018年12月铜仁一次罕见暴雪天气过程成因分析  

Cause Analysis of a Rare Snowstorm in Tongren in December2018

作　　者：李习瑾 钟有萍 胡萍 陈超 聂云 Li Xijin;Zhong Youping;Hu Ping;Chen Chao;Nie Yun(Tongren Meteorological Service,Tongren Guizhou 554300)

机构地区：[1]贵州省铜仁市气象局

出　　处：《气象研究与应用》2019年第3期22-25,共4页Journal of Meteorological Research and Application

基　　金：铜仁市气象局科研基金(铜气科合[2015]10号)“基于数值预报产品的农业气象灾害预报技术研究”

摘　　要：利用常规气象观测资料、NCEP1°×1°再分析资料对2018年12月29至30日贵州铜仁的罕见暴雪天气过程进行分析。结果表明:从蒙古南下的冷空气与来自孟加拉湾的暖湿气流在贵州北部长时间交汇,形成强烈的辐合上升运动,是造成此次暴雪天气过程的主要原因;温度垂直结构为冰晶层-冷层的结构特征,湿层深厚,云顶温度小于-12℃,整层为冷性结构,利于冰晶的产生,且中层暖层消失,对降雪的产生十分有利;充沛的水汽辐合和强烈的上升运动为本次暴雪天气过程提供了水汽条件、动力条件。The rare snowstorm weather process in Tongren,Guizhou Province,from December 29 to 30,2018 was analyzed by using conventional observation data and NCEP 1°×1°reanalysis data.The results show that the main reason for the snowstorm is that the cold air from South Mongolia intersects with the warm and wet air from the Bay of Bengal for a long time in northern Guizhou,forming a strong convergence upward movement.The vertical structure of temperature is ice crystal layer-cold layer structure,the wet layer is deep,the top temperature of cloud is less than-12℃,and the whole layer is cold structure,which is conducive to the formation of ice crystals.The disappearance of the middle warm layer is very beneficial to the formation of snow.The abundant water vapor convergence and strong upward movement provide water vapor conditions and dynamic conditions for the snowstorm weather process.

关 键 词：回流降雪 低空急流 冷垫 

分 类 号：P429[天文地球—大气科学及气象学]