摘要
文章用主分量、功率谱、带通滤波及复主分量分析方法，对欧亚地区１９５１～１９９２年的５００ｈＰａ月平均高度场进行分析，研究了欧亚大气环流年际振荡的时空分布特征。结果表明：欧亚５００ｈＰａ月平均大气环流主要存在准２．５年、准３．５年振荡周期。副热带地区大气环流以准３．５年振荡为主要周期；中高纬地区以准２．５年振荡为主要周期，复主分量分析还表明了这两种振荡的传播方向和随时间变化各不相同，欧亚５００ｈＰａ月平均大气环流的准３．５年振荡特征与赤道东太平洋海温的变化及厄尔尼诺现象有密切的关系。
The 500 hPa mean monthly height field in Eurasia during 1951～1992 is analysed byusing principal component,power spectral,band-pass filter and complex principalcomponent analysis. Features of interannual oscillation of the general circulation inEurasia are investigated. The results show that there exist quasi-2. 5 year and quasi-3.5year oscillations in the 500 hPa mean monthly circulation in Eurasia,the main oscillationin the subtropical zone is quasi-3. 5 years,and the quasi-2. 5 year oscillation isprominent in the area of the middle and high latitudes. Furthermore,the complexprincipal component analysis indicates that the propagation directions for the twooscillations and their variations with time are different from each other, and that thefeatures of quasi-3.5 year oscillation of the 500 hPa mean monthly circulation in Eurasiaare closely associated with the El Nino phenomenon and the variation of SSTA in theequatorial eastern Pacific.
出处
《应用气象学报》
CSCD
北大核心
1995年第4期461-467,共7页
Journal of Applied Meteorological Science
基金
国家气象局<长期预报理论和方法的研究>课题资助
关键词
大气环流
年际振荡
统计特征
General circulation
Interannual oscillation
Statistical features.
