贵州凝冻的时空分布特征和环流成因分析  

Time and Space Characters of Congeal in Guizhou and Circulation Features Analyses

作　　者：许丹 罗喜平 

机构地区：[1]贵州省气象台,贵州贵阳550002

出　　处：《高原气象》2003年第4期401-404,共4页Plateau Meteorology

基　　金：贵州省"九五"攻关项目"短期气候预测系统"资助

摘　　要：以贵州省47个气象地面站1951—1996年的冬季凝冻指数为基本研究对象,分析凝冻指数场的分布特征及时间系数的演变规律,并分析了第一时间系数与冬季500hPa高度的相关场分布特征。根据第一时间系数的变化,确定了5个重凝冻年和5个无凝冻年,用合成分析方法分析了重凝冻年和无凝冻年的冬季平均500hPa高度场的分布特征。结果表明:重凝冻年与无凝冻年差异最显著的地区在欧亚地区,重凝冻年呈"北高南低"型的距平分布,无凝冻年呈"北低南高"型的距平分布。By using the congeal index of 47 meterological stations of Guizhou from 1951 to 1996, the field distribution feature of congeal index and the evoluting rule of time coefficient were analyzed, and the first time coefficient and 500 hPa height correlation field distribution were analyzed as well. Based on the change of the first time coefficient, the five serious and light congeal years in the last 46 years were determined. Using the composite method, the distribution feature of winter 500 hPa average height in the serious and light congeal years were analyzed. The results show that the most significant differences occured over the Europe and Asia areas.When 500 hPa geopotentical height anomaly in winter is with the positive(negative) in the north and the negative(positive) in the south, the congeal in Guizhou is serious(light).

关 键 词：贵州 凝冻 时空分布 环流成因 距平分布 

分 类 号：P426.3[天文地球—大气科学及气象学]