热带-热带外大气环球遥相关的年代际变化再分析  

Reanalysis on Interdecadal Variability of the Circum-Global Teleconnection

作　　者：王宏[1] 黄菲[1] 杨宇星[2] 

机构地区：[1]中国海洋大学物理海洋实验室,山东省高校海洋-大气相互作用与气候重点实验室,山东青岛266100 [2]中国科学院海洋研究所,山东青岛266071

出　　处：《中国海洋大学学报（自然科学版）》2013年第6期1-8,共8页Periodical of Ocean University of China

基　　金：全球变化研究国家重大科学研究计划项目(2010CB951403,2012CB955604);国家自然科学基金项目(40975038,40830106)资助

摘　　要：基于前人关于热带-热带外大气环球遥相关(CGT)的研究基础上,系统分析了CGT在年际和年代际尺度上的方差贡献,发现CGT主要以年际变化为主,但存在较为显著的年代际变化特征;发现CGT指数所表征的CGT遥相关波列中心在1979年之后有所加强,且CGT主要表现为2种EOF主模态的杂合特征;并且发现这种年代际变化主要是由于ElNio的年代际转型以及相应的季风-ENSO之间的关系发生了年代际变化所致。This study investigates the interdecadal and interannual variability of the summer Circum-Global Teleconnection（CGT）.It is found that the variability of the CGT is mostly characterized by the interannual variation,and this variation also displays an obvious interdecadal variability.The interdecadal variation of CGT shows that there exists a decadal shift in mid-late 1970s.During the period of 1958—1978,the CGT appears in the first singular value decomposition（SVD） mode between the geopotential height at 200hPa（GH200） and tropical rainfall,which stands for the second empirical orthogonal function（EOF） of GH200.This feature bears similar to that of the typical CGT defined by Ding et al.（2005）.However,after 1979,CGT demonstrates a hybrid mode related to both the first and second EOF mode of GH200.This may due to the interdecadal property change of El Nio,named El Nio Modoki or central Pacific El Nio occurring frequently in the past 30 years,and the decadal shift of relationship between the El Nio/Southern Oscillation and tropical monsoon rainfall.

关 键 词：大气环球遥相关 年代际变化 热带-热带外耦合 北半球 夏季 

分 类 号：P401[天文地球—大气物理学与大气环境]