| 欧亚500 hPa月平均大气环流的年际振荡特征 |
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| 引用本文： | 何敏,罗艳.欧亚500 hPa月平均大气环流的年际振荡特征[J].应用气象学报,1995,6(4):461-467. |
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| 作者姓名： | 何敏 罗艳 |
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| 作者单位： | 1.国家气象中心 |
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| 基金项目： | 国家气象局《长期预报理论和方法的研究》课题资助 |
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| 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。
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| 关 键 词： | 大气环流 年际振荡 统计特征 |
Features of Interannual Oscillation of 500 hPa Mean Monthly General Circulation in Eurasia |
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| He Min,LuoYan.Features of Interannual Oscillation of 500 hPa Mean Monthly General Circulation in Eurasia[J].Quarterly Journal of Applied Meteorology,1995,6(4):461-467. |
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| Authors: | He Min LuoYan |
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| Affiliation: | 1.(National Meteorological Center, Beijing 100081) |
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| Abstract: | The 500 hPa mean monthly height field in Eurasia during 1951~1992 is analysed by using principal component, power spectral, band-pass filter and complex principal component analysis. Features of interannual oscillation of the general circulation in Eurasia are investigated. The results show that there exist quasi-2.5 year and quasi-3.5 year oscillations in the 500 hPa mean monthly circulation in Eurasia, the main oscillation in the subtropical zone is quasi-3.5 year, and the quasi-2.5 year oscillation is prominent in the area of the middle and high latitudes. Furthermore, the complex principal component analysis indicates that the propagation directions for the two oscillations and their variations with time are different from each other, and that the features of quasi-3.5 year oscillation of the 500 hPa mean monthly circulation in Eurasia are closely associated with the E1 Nino phenomenon and the variation of SSTA in the equatorial eastern Pacific |
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| Keywords: | General circulation Interannual oscillation Statistical features |
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