北半球冬季大气环流低频异常变化特征的研究  

A STUDY ON VARIATIONAL CHARACTERISTICS OF ATMOSPHERIC LOW-FREQUENCY ANOMALOUS FLOWS DURING THE NORTHERN WINTER

作　　者：王国民[1] 黄士松[1] 

机构地区：[1]南京大学大气科学系

出　　处：《气象科学》1992年第3期251-257,共7页Journal of the Meteorological Sciences

基　　金：国家自然科学基金

摘　　要：本文使用观测的北半球冬季逐年月平均500hPa高度场资料序列,对5种低规变化模态对应的正指数和负指数环流异常的持续性和稳定性特征进行了统计分析和动力学诊断,发现对不同指数的低频变化模态其持续性和稳定性的特征不同,它们之间有内在的动力学关系。最后讨论了这些结果对长期天气预报的意义。In this paper?statistical and dynamical analyses are made of the persistence and stability characteristics of both positive and negative index flows of 5 low-frequency variability patterns, by use of a data- set consisting of observed Northern winter monthly mean 500 hPa height analyses for many years . It is found that there are distinct characteristics in the persistence and stability. between the positive and the negative index modes of low-frequency variability. Finally, the implication of these results on lpng-range weather forecast is also

关 键 词：环流异常 长期天气预报 高度场 月平均 预报水平 正压不稳定 瞬变涡动 指数和 动力学关系 大尺度环流 

分 类 号：P4[天文地球—大气科学及气象学]