北半球夏季500hPa候平均高度场异常持续性的分析  

An Analysis of Persistence of 500 hPa Pentad Mean Height Anomalies for the Northern Hemisphere Summer

作　　者：江剑民[1] 钱传海[1] 

机构地区：[1]北京气象学院,北京100081

出　　处：《大气科学》1994年第2期200-206,共7页Chinese Journal of Atmospheric Sciences

基　　金：国家自然科学基金

摘　　要：本文应用环流持续性异常判据和旋转主分量分析方法，对1951－1986年间夏季北半球500hPa逐俊平均高度场进行了计算分析，探讨夏季持续性环流异常的地理分布及持续期的基本特征。结果表明：前11项旋转主分量的主要高荷载中心，与持续异常的高频数中心或其邻近区域大都基本吻合；候平均环流异常的持续性略高于马尔柯夫过程。但某些区域季节性环流异常及多年趋势性环流异常，通常是由某些环流系统或作用中心多次替换、反复出现的持续性异常所组成的。夏季副热带系统是这类异常的重要组成部分。Both of the persistent anomaly criterion and the Rotated Principal Component (RPC) analysis were applied to 500 hPa pentad mean height data for the Northern Hemisphere Summer during 1951-1986 to diagnose the characteristics of geographical distribution and duration of persistent anom-alies of the Northern Hemisphere summertime circulation. The results show that the localities of high-loading centers of the first 11 RPCs basically coincide with those of the high frequency regions where the persistent anomalies occur. The persistence of pentad mean circulation anomalies is little higher than the Marckov Chain, but some seasonal abnormalities often comprise reoccurrences of the persistent anomalies with short breaks, and the subtropic systems are important components of the persistent anomalies for the Summertime.

关 键 词：环流异常 持续期 高度场 大气环流 

分 类 号：P434[天文地球—大气科学及气象学]