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          Institute: MPI für Meteorologie     Collection: Ocean in the Earth System     Display Documents



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ID: 377776.0, MPI für Meteorologie / Ocean in the Earth System
Observed and simulated daily variability of the meridional overturning circulation at 26.5°N in the Atlantic
Authors:Baehr, J.; Cunningham, S.; Haak, H.; Heimbach, P.; Kanzow, T.; Marotzke, J.
Language:English
Date of Publication (YYYY-MM-DD):2009
Title of Journal:Ocean Science
Volume:5
Start Page:575
End Page:589
Review Status:Peer-review
Audience:Not Specified
Abstract / Description: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-O 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.
External Publication Status:published
Document Type:Article
Communicated by:Carola Kauhs
Affiliations:MPI für Meteorologie/Ocean in the Earth System
Relations:Has References-URL:http://www.ocean-sci.net/6/1/2010/os-6-1-2010.html
Identifiers:URL:www.ocean-sci.net/5/575/2009/
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