宁夏一次大暴雪天气过程的物理成因  

Analysis on Causes of a Heavy Snowstorm in Ningxia

作　　者：贾宏元[1] 赵光平[2] 沈跃琴 纪晓玲[2] 

机构地区：[1]兰州大学大气科学学院,甘肃兰州730000 [2]宁夏气象防灾减灾重点实验室,宁夏银川750002 [3]宁夏气象台,宁夏银川750002

出　　处：《干旱气象》2007年第4期36-40,共5页Journal of Arid Meteorology

基　　金：宁夏科技攻关项目"宁夏新一代灾害性天气事件联防联报监测预警体系研究"资助

摘　　要：在分析大气环流及其诸层物理量场特征基础上,结合逐时卫星云图资料对2002年10月17～18日宁夏南部山区一次大暴雪天气过程成因进行了探讨,发现此次暴雪中低层存在着较明显的3股气流的共同作用,指出低涡及暖式切变线是本次过程重要的天气影响系统,降水水汽主要来自于低层输入,同时分析还表明宁夏强降雪也具有中小尺度特征。Based on analysis of characteristics of atmospheric circulation and physical quantity fields on each layer,as well as hourly satellite images,the causes of a heavy snowstorm process in mountainous region of south Ningxia from 17to 18 October in 2002 was studied.Results show that three air currents on middle and low layers play an important role in this process,and low vortex and warm shear line are key influencing systems,and vapour transport comes primarily from the low layer.The study also reveals the fact that meso-microscale system is active in the heavy snowstorm process.

关 键 词：暴雪 成因 宁夏 

分 类 号：P458.11[天文地球—大气科学及气象学]