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An Observational Analysis of the Oceanic and Atmospheric Structure of Global-Scale Multi-decadal Variability

Advances in Atmospheric Sciences 2014年第2期31卷 316-330页

作者： Peng LIU Chung-Hsiung SUI Key Laboratory of Meteorological Disaster of Ministry of Education Nanjing University of Information Science & Technology Department of Atmospheric Sciences NTU Taipei 10617

The aim of the present study was to identify multi-decadal variability （MDV） relative to the current centennial global warming trend in available observation *** centennial global wanning trend was first identified in the global mean surface temperature （STgm） *** MDV was identified based on three sets of climate variables,including sea surface temperature （SST）,ocean temperature from the surface to 700 m,and the NCEP and ERA40 reanalysis datasets,*** variables were detrended and low-pass *** three independent EOF analyses of the filtered variables,all results consistently showed two dominant modes,with their respective temporal variability resembling the Pacific Decadal oscillation/Inter-decadal Pacific oscillation （pdo/IPO） and the Atlantic Multi-decadal oscillation （AMO）.The spatial structure of the pdo-like oscillation is characterized by an ENSO-like structure and hemispheric symmetric *** structure associated with the AMO-like oscillation exhibits hemispheric asymmetric features with anomalous warm air over Eurasia and warm SST in the Atlantic and Pacific basin north of 10°S,and cold SST over the southern *** Pacific and Atlantic MDV in upper-ocean temperature suggest that they are mutually *** also found that the pdo-like and AMO-like oscillations are almost equally important in global-scale MDV by EOF *** the period 1975-2005,the evolution of the two oscillations has given rise to strong temperature trends and has contributed almost half of the STgm ***,in the next decade,the two oscillations are expected to slow down the global warming trends.

关键词： global-scale multi-decadal variation global mean surface temperature pdo-like oscillation AMO-like oscillation

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