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      氣候變化研究進(jìn)展 ?? 2008, Vol. 4 ?? Issue (004): 240-244.

      ? 研究短論 ? 上一篇    下一篇

      冬季歐亞海平面氣壓場(chǎng)主要空間模態(tài)的年代際變化特征

      楊秋明   

      1. 江蘇省氣象科學(xué)研究所
      • 收稿日期:2007-11-09 修回日期:2008-01-21 出版日期:2008-07-31 發(fā)布日期:2008-07-31
      • 通訊作者: 楊秋明

      Interdecadal Variations of the Principal Modes for Winter Sea Level Pressure Anomalies over Eurasia

      • Received:2007-11-09 Revised:2008-01-21 Online:2008-07-31 Published:2008-07-31

      摘要: 運(yùn)用非線性主成分分析法對(duì)歐亞地區(qū)1948-2007年冬季海平面氣壓距平場(chǎng)進(jìn)行分析。結(jié)果表明:冬季歐亞地區(qū)海平面氣壓異常變率具有顯著的非線性特征,當(dāng)非線性主成分取不同的異常值時(shí),對(duì)應(yīng)的空間氣壓異常分布型具有顯著的非對(duì)稱性。同時(shí),第一非線性模態(tài)(NLPC1)年際振蕩強(qiáng)度和周期在20世紀(jì)70年代初存在明顯的年代際變化,1970年以后,年際振蕩強(qiáng)度顯著增強(qiáng)。

      關(guān)鍵詞: 海平面氣壓, 非線性空間模態(tài), 歐亞地區(qū), 冬季

      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.

      Key words: sea level pressure, nonlinear spatial mode, Eurasia, winter, interdecadal variation

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