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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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