| 冬季欧亚海平面气压场主要空间模态的年代际变化特征 |
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| 引用本文： | 杨秋明.冬季欧亚海平面气压场主要空间模态的年代际变化特征[J].气候变化研究进展,2008,4(04):240-244. |
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| 作者姓名： | 杨秋明 |
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| 作者单位： | 江苏省气象科学研究所 |
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| 摘 要： | 运用非线性主成分分析法对欧亚地区1948-2007年冬季海平面气压距平场进行分析。结果表明：冬季欧亚地区海平面气压异常变率具有显著的非线性特征，当非线性主成分取不同的异常值时，对应的空间气压异常分布型具有显著的非对称性。同时，第一非线性模态（NLPC1）年际振荡强度和周期在20世纪70年代初存在明显的年代际变化，1970年以后，年际振荡强度显著增强。
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| 关 键 词： | 海平面气压 非线性空间模态 欧亚地区 冬季 |
| 收稿时间： | 2007-11-9 |
| 修稿时间： | 2008-1-21
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Interdecadal Variations of the Principal Modes for Winter Sea Level Pressure Anomalies over Eurasia |
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| Abstract: | Eurasian winter sea level pressure anomalies during 1948-2007 were investigated by applying a nonlinear principal component analysis (NLPCA) method. The results show that there was a distinct nonlinear characteristic in Eurasian winter sea level pressure anomaly changes. The spatial distribution was obviously asymmetrical when the first nonlinear principal component (NLPC1) took various positive or negative anomalous values. It is found that there was an evident interdecadal change of the intensity and period of interannual oscillations for the first nonlinear principal mode in the early 1970s, afterwards the nonlinear interannual oscillation was significantly enhanced. |
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| Keywords: | sea level pressure nonlinear spatial mode Eurasia winter interdecadal variation |
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