globalchange  > 过去全球变化的重建
DOI: 10.1007/s00382-014-2056-1
Scopus记录号: 2-s2.0-84922881344
论文题名:
A multi-model comparison of Atlantic multidecadal variability
作者: Ba J.; Keenlyside N.S.; Latif M.; Park W.; Ding H.; Lohmann K.; Mignot J.; Menary M.; Otterå O.H.; Wouters B.; Salas y Melia D.; Oka A.; Bellucci A.; Volodin E.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2014
卷: 43, 期:2017-09-10
起始页码: 2333
结束页码: 2348
语种: 英语
英文关键词: Atlantic meridional overturning circulation (AMOC) ; Atlantic multidecadal variability (AMV) ; North Atlantic Oscillation (NAO) ; Subpolar gyre (SPG)
英文摘要: A multi-model analysis of Atlantic multidecadal variability is performed with the following aims: to investigate the similarities to observations; to assess the strength and relative importance of the different elements of the mechanism proposed by Delworth et al. (J Clim 6:1993–2011, 1993) (hereafter D93) among coupled general circulation models (CGCMs); and to relate model differences to mean systematic error. The analysis is performed with long control simulations from ten CGCMs, with lengths ranging between 500 and 3600 years. In most models the variations of sea surface temperature (SST) averaged over North Atlantic show considerable power on multidecadal time scales, but with different periodicity. The SST variations are largest in the mid-latitude region, consistent with the short instrumental record. Despite large differences in model configurations, we find quite some consistency among the models in terms of processes. In eight of the ten models the mid-latitude SST variations are significantly correlated with fluctuations in the Atlantic meridional overturning circulation (AMOC), suggesting a link to northward heat transport changes. Consistent with this link, the three models with the weakest AMOC have the largest cold SST bias in the North Atlantic. There is no linear relationship on decadal timescales between AMOC and North Atlantic Oscillation in the models. Analysis of the key elements of the D93 mechanisms revealed the following: Most models present strong evidence that high-latitude winter mixing precede AMOC changes. However, the regions of wintertime convection differ among models. In most models salinity-induced density anomalies in the convective region tend to lead AMOC, while temperature-induced density anomalies lead AMOC only in one model. However, analysis shows that salinity may play an overly important role in most models, because of cold temperature biases in their relevant convective regions. In most models subpolar gyre variations tend to lead AMOC changes, and this relation is strong in more than half of the models. © 2014, Springer-Verlag Berlin Heidelberg.
资助项目: DFG, Deutsche Forschungsgemeinschaft
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/54247
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作者单位: GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany; Geophysical Institute and Bjerknes Centre, University of Bergen, Bergen, Norway; Max Planck Institute for Meteorology, Hamburg, Germany; LOCEAN/IPSL, UPMC/CNRS/IRD/MNHN, University Pierre and Marie Curie, Paris, France; Met Office Hadley Center, Exeter, United Kingdom; Uni Research and the Bjerknes Centre, Bergen, Norway; Royal Netherlands Meteorological Institute, De Bilt, Netherlands; CNRM/GAME, Météo-France/CNRS, Toulouse, France; Atmosphere and Ocean Research Institute, University of Tokyo, Tokyo, Japan; Centro Euro-Mediterraneo per i Cambiamenti Climatici, CCMC, Bologna, Italy; Institute of Numerical Mathematics RAS, INMRAS, Moscow, Russian Federation; School of Geographical Science, University of Bristol, Bristol, United Kingdom; Department of Physics, University of Colorado at Boulder, Boulder, CO, United States; Climate and Environmental Physics, Institute of Physics and Oeschger Center of Climate Research, University of Bern, Bern, Switzerland

Recommended Citation:
Ba J.,Keenlyside N.S.,Latif M.,et al. A multi-model comparison of Atlantic multidecadal variability[J]. Climate Dynamics,2014-01-01,43(2017-09-10)
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