Covarying modes of the Pacific SST and northern hemispheric midlatitude atmospheric circulation anomalies during winter  

作　　者：Yimin Zhu Xiuqun Yang Qian Xie Yongqiang Yu 

机构地区：[1]Department of Atmospheric Science, Nanjing University, Nanfing 210093, China [2]Institute of Meteorology, PLA University of Science and Technology, Nanjing 211101, China [3]LASG, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China

出　　处：《Progress in Natural Science:Materials International》2008年第10期1261-1270,共10页自然科学进展·国际材料（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant Nos.40425009,40730953 and 40675049);National Key Program on Basic Research and Development Projects (Grant No.2004CB418303);The Knowledge Innovation Program of the Chinese Academy of Sciences (IAP07305);Open Project of LASG,Institute of Atmospheric Physics,Chinese Academy of Sciences.

摘　　要：The interannual-to-interdecadal relationship between the Pacific sea surface temperature （SST） and the northern hemispheric midlatitude＇s atmosphere represented by the circumpolar vortex was documented with the global oceanic and atmospheric reanalysis data of recent 50 years. Two covarying modes of the Pacific SST and northern circumpolar vortex anomalies during winter were examined using the singular value decomposition and wavelet analysis techniques. One is the interannual, ENSO-related mode and the other is the interdecadal, North Pacific SST-related mode with a period of around 20 years. The two modes exhibit distinct spatial structures. For the interannual mode, the SST anomaly is characterized by a typical ENSO pattern with the principal signature in the tropical eastern Pacific and secondary one in the central North Pacific, while the atmospheric anomaly is regional, characterized by a Pacific-North American pattern. For the inter- decadal mode, large SST anomaly is located in the central North Pacific, while the atmospheric anomaly is zonally global, associated with the midlatitute＇s standing long-wave variations. When the central North Pacific is colder, the long-wave is stronger, and vice versa. Further investigations suggest that the interdecadal mode could involve an interaction between ＂two oceans and an atmosphere＂.在和平的海表面温度(SST ) 和北半球的 midlatitude 之间的 interannual-to-interdecadal 关系是围绕天极的旋涡代表的空气与全球海洋、大气的分析数据被记录最近 50 年。和平的 SST 和北围绕天极的旋涡异例的二个 covarying 模式用单个价值分解和小浪分析技术在冬季期间被检验。一个人是内部年度、 ENSO 相关的模式和其它是内部有约 20 年的一个时期的十的、向北和平的 SST 相关的模式。二个模式展出不同空间结构。为内部年度模式， SST 异例被一个典型 ENSO 模式在中央诺思在热带的东方的和平、第二等的与主要签名描绘当大气的异例是地区性的时，太平洋由一个和平北方的美国模式描绘了。为内部十的模式，大 SST 异例位于中央诺思当大气的异例是地带地全球的时，太平洋与 midlatitute 的家联系了承受长波浪的变化。当中央诺思太平洋更冷时，长波浪更强壮，并且反过来也如此。进一步的调查建议内部十的模式能包含在“二海洋”和气氛之间的一个相互作用。

关 键 词：Sea surface temperature Atmospheric circulation ENSO Decadal variability 

分 类 号：P732[天文地球—海洋科学]