北半球冬季环流异常与ENSO的非线性关系
投稿时间:2007-03-05  修订日期:2007-05-22  点此下载全文
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作者单位
郭品文 南京信息工程大学, 江苏省气象灾害重点实验室, 江苏南京, 210044 
李汀 南京信息工程大学, 江苏省气象灾害重点实验室, 江苏南京, 210044 
姜玥宏 南京信息工程大学, 江苏省气象灾害重点实验室, 江苏南京, 210044 
基金项目:江苏省气象灾害重点实验室资助项目(KLME05007)
中文摘要:运用非线性典型相关分析(nonlinear canonical correlation analysis,简称NLCCA)方法,对热带太平洋海表温度异常(SSTA)场与北半球冬季海平面气压异常场(SLPA)进行非线性分析,以反映ENSO与北半球冬季环流异常之间的非线性关系。NLCCA的结果表明:从极冷到极暖期,北半球冬季SLPA场对ENSO的投影在各主成分所分别构成的平面或空间中分别形成一条直线和一条抛物线,说明北半球冬季环流异常与ENSO的相关包含线性和具有二次特征的非线性两部分。无论ENSO的冷、暖事件都能导致冰岛低压减弱,且西伯利亚高压、北美高压和北太平洋高压随SSTA的变化不对称,进一步证明了ENSO对北半球冬季环流异常的非线性影响,其中冰岛低压对于ENSO响应的非线性特征最强,而阿留申低压与ENSO则主要是线性相关。
中文关键词:ENSO  冬季环流异常  非线性典型相关分析
 
Nonlinear Association between Winter Atmospheric Circulation Anomaly over Northern Hemisphere and ENSO
Abstract:A nonlinear projection of the tropical Pacific sea surface temperature anomalies(SSTA) onto the Northern Hemisphere winter sea level pressure field(SLP) anomalies by nonlinear canonical correlation analysis(NLCCA) was performed to investigate the nonlinear association between ENSO and the Northern Hemisphere winter atmospheric circulation anomaly.The NLCCA results reveal that,from the extreme cold period to the extreme warm period,the responds of the Northern Hemisphere winter atmospheric circulation anomaly to ENSO is a straight line and a parabola,explaining that the response of winter circulation anomaly over Northern Hemisphere to ENSO is composed of a linear part and a nonlinear part with the quadratic character.Both the cold and warm periods of ENSO will make Iceland Low weaker,and the variations of Siberian High,Northern America High and Northern Pacific High are asymmetric with the SSTA,proving the nonlinear responds of winter atmospheric circulation anomaly over Northern Hemisphere to ENSO.The nonlinear response of Iceland Low to ENSO is the strongest,while the response of Aleutian Low to ENSO is mainly linear.
keywords:ENSO  winter circumfluence anomalies  nonlinear canonical correlation analysis(NLCCA)
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