初冬济南两次暴雪过程对比分析  

Comparative Analysis of Two Snowstorms in Jinan in Early Winter

作　　者：尹承美[1] 王新红[1] 

机构地区：[1]济南市气象局,山东济南250002

出　　处：《中国人口·资源与环境》2012年第S1期183-186,共4页China Population,Resources and Environment

摘　　要：利用高空和地面观测资料对济南市区初冬两次暴雪过程进行了对比分析。结果表明:两次暴雪过程500 hPa影响系统都是中支槽,但环流形势分别是"两槽一脊"型和"一槽一脊"型;700 hPa西南低空急流为暴雪的产生提供了充沛的水汽条件;低层东北风携带冷空气形成冷空气垫,西南暖湿气流沿冷空气垫爬升是暴雪形成的重要动力条件,两次暴雪过程上升运动区都伸展到200 hPa,但上升运动区的起始高度不同。We analyzed the processes of two snowstorm in Jinan in early winter by using of upper-air and surface observation data.The results show that;The weather influence systems of 500hPa in those two processes both are the middle branch trough,the circulation situation are 'trough-ridge-trough' and 'trough-ridge' type;The southwest low jet at 700hPa provided abundant water vapor for the snowstorms; The formation of low-level northeasterly winds bring cold air pad,by cold air warm air climbing along the cold pad southwest is an important driving force to form snow conditions;The ascending motion area of those are extended to 200hPa,though they are started from different initial heights;The temperature of 925hPa or 1000hPa below 0℃is the key to transforming the nature of precipitation.

关 键 词：初冬暴雪 环流形势 水汽条件 动力条件 对比分析 

分 类 号：P458.121.1[天文地球—大气科学及气象学]