宁夏初冬一次大暴雪天气过程成因分析  

Analysis on Causes of a Heavy Snowstorm at the Southern Ningxia in Early Winter

作　　者：贾宏元[1] 赵光平[2] 沈跃琴 纪晓玲[1] 

机构地区：[1]宁夏气象防灾减灾重点实验室,宁夏银川750002 [2]宁夏气象台

出　　处：《沙漠与绿洲气象》2007年第4期17-21,共5页Desert and Oasis Meteorology

基　　金：宁夏科技攻关项目"我区天气异常与突变规律的诊断及监测预警技术"资助

摘　　要：在分析了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日～18日宁夏固原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三股气流的共同作用,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冬半年的强降水也具有的中小尺度特征。Based on analysis of characteristics of atmospheric circulation and physical parameter field on each layer, and analysis of hourly digital satellite image data, a heavy snowstorm process that occurred in Ningxia Guyuan during 17-18 October in 2002 was studied. Results show that three air currents on middle and low layers play an important role in this process, the low vortex and the warm shear line are key influencing systems, and the vapour transport comes from the low layer primarily. The study also revealed the fact that meso-microscale system is active in winter heavy precipitation in Ningxia.

关 键 词：暴雪 成因 宁夏 

分 类 号：P426.634[天文地球—大气科学及气象学]