Observed and simulated estimates of the meridional overturning circulation at 26.5° N in the Atlantic

被引:29
作者
Baehr, J. [1 ]
Cunnningham, S. [2 ]
Haak, H. [3 ]
Heimbach, P. [1 ]
Kanzow, T. [2 ]
Marotzke, J. [3 ]
机构
[1] MIT, Cambridge, MA 02139 USA
[2] Natl Oceanog Ctr, Southampton, Hants, England
[3] Max Planck Inst Meteorol, Hamburg, Germany
基金
英国自然环境研究理事会;
关键词
GLOBAL OCEAN CIRCULATION; NORTH-ATLANTIC; DECADAL CHANGES; HEAT-FLUX; MODEL; VARIABILITY; ADJOINT; 26-DEGREES-N; TRANSPORT;
D O I
10.5194/os-5-575-2009
中图分类号
P4 [大气科学(气象学)];
学科分类号
0706 ; 070601 ;
摘要
Daily timeseries of the meridional overturning circulation (MOC) estimated from the UK/US RAPID/MOCHA array at 26.5 degrees N in the Atlantic are used to evaluate the MOC as simulated in two global circulation models: (I) an 8-member ensemble of the coupled climate model ECHAM5/MPI-OM, and (II) the ECCO-GODAE state estimate. In ECHAM5/MPI-OM, we find that the observed and simulated MOC have a similar variability and time-mean within the 99% confidence interval. In ECCO-GODAE, we find that the observed and simulated MOC show a significant correlation within the 99% confidence interval. To investigate the contribution of the different transport components, the MOC is decomposed into Florida Current, Ekman and mid-ocean transports. In both models, the mid-ocean transport is closely approximated by the residual of the MOC minus Florida Current and Ekman transports. As the models conserve volume by definition, future comparisons of the RAPID/MOCHA mid-ocean transport should be done against the residual transport in the models. The similarity in the variance and the correlation between the RAPID/MOCHA, and respectively ECHAM5/MPI-OM and ECCO-GODAE MOC estimates at 26.5 degrees N is encouraging in the context of estimating (natural) variability in climate simulations and its use in climate change signal-to-noise detection analyses. Enhanced confidence in simulated hydrographic and transport variability will require longer observational time series.
引用
收藏
页码:575 / 589
页数:15
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