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| Titel |
Observed and simulated estimates of the meridional overturning circulation at 26.5° N in the Atlantic |
| VerfasserIn |
J. Baehr, S. Cunnningham, H. Haak, P. Heimbach, T. Kanzow, J. Marotzke |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1812-0784
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| Digitales Dokument |
URL |
| Erschienen |
In: Ocean Science ; 5, no. 4 ; Nr. 5, no. 4 (2009-11-16), S.575-589 |
| Datensatznummer |
250002733
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| Publikation (Nr.) |
 copernicus.org/os-5-575-2009.pdf |
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| Zusammenfassung |
| Daily timeseries of the meridional overturning circulation (MOC) estimated
from the UK/US RAPID/MOCHA array at 26.5° 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° 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. |
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