globalchange  > 过去全球变化的重建
DOI: 10.1007/s00382-015-2660-8
Scopus记录号: 2-s2.0-84959079063
论文题名:
Mechanisms of internally generated decadal-to-multidecadal variability of SST in the Atlantic Ocean in a coupled GCM
作者: Chen H.; Schneider E.K.; Wu Z.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2016
卷: 46, 期:2017-05-06
起始页码: 1517
结束页码: 1546
语种: 英语
英文关键词: Atlantic multidecadal variability ; Interactive ensemble ; Internal atmospheric noise
英文摘要: Mechanisms of the internally generated decadal-to-multidecadal variability of SST in the Atlantic Ocean are investigated in a long control simulation of the Community Climate System Model version 3 with constant external forcing. The interactive ensemble (IE) coupling strategy, with an ensemble of atmospheric GCMs (AGCM) coupled to an ocean model, a sea-ice model and a land model, is used to diagnose the roles of various processes in the coupled GCM (CGCM). The noise components of heat flux, wind stress and fresh water flux of the control simulation, determined from the CGCM surface fluxes by subtracting the SST-forced surface fluxes, estimated as the ensemble mean of AGCM simulations, are applied at the ocean surface of the IE in different regions and in different combinations. The IE simulations demonstrate that the climate variability in the control simulation is predominantly forced by noise. The local noise forcing is found to be responsible for the SST variability in the Atlantic Ocean, with noise heat flux and noise wind stress playing a critical role. The control run Atlantic multidecadal variability (AMV) index is decomposed into interannual, decadal and multidecadal modes based on the ensemble empirical mode decomposition. The AMV multidecadal mode, a combination of 50- and 100-year modes, is examined in detail. The North Atlantic Oscillation (NAO) pattern in the atmosphere, dominated by the noise component, forces the multidecadal mode through noise heat flux and noise wind stress. The noise wind stress forcing on the multidecadal mode is associated with ocean dynamics, including gyre adjustment and the Atlantic Meridional Overturning Circulation (AMOC). The AMV decadal mode is also found to be related to noise NAO forcing. The associated ocean dynamics are connected with both noise heat flux and noise wind stress, but the AMOC related to the decadal mode is more likely to be forced by noise heat flux. For both multidecadal and decadal modes, the atmospheric response to SST, including the SST-forced heat flux and SST-forced wind stress, acts as a damping. © 2015, Springer-Verlag Berlin Heidelberg.
资助项目: NSFC, National Aeronautics and Space Administration ; NSFC, National Aeronautics and Space Administration ; NSF, National Aeronautics and Space Administration ; NSF, National Aeronautics and Space Administration ; NOAA, National Aeronautics and Space Administration ; NASA, National Aeronautics and Space Administration
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/53777
Appears in Collections:过去全球变化的重建

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作者单位: Earth System Modeling Center and Key Laboratory of Meteorological Disaster of Ministry of Education, Nanjing University of Information Science and Technology, Nanjing, China; Department of Atmospheric Oceanic and Earth Sciences, George Mason University, Fairfax, VA, United States; Center for Ocean-Land-Atmosphere Studies, Institute of Global Environment and Society, Fairfax, VA, United States

Recommended Citation:
Chen H.,Schneider E.K.,Wu Z.. Mechanisms of internally generated decadal-to-multidecadal variability of SST in the Atlantic Ocean in a coupled GCM[J]. Climate Dynamics,2016-01-01,46(2017-05-06)
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