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| Titel |
The low-resolution CCSM2 revisited: new adjustments and a present-day control run |
| VerfasserIn |
M. Prange |
| 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 ; 4, no. 2 ; Nr. 4, no. 2 (2008-05-26), S.151-181 |
| Datensatznummer |
250001641
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| Publikation (Nr.) |
 copernicus.org/os-4-151-2008.pdf |
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| Zusammenfassung |
| The low-resolution (T31) version of the Community Climate System Model CCSM2.0.1 is revisited and
adjusted by deepening the Greenland-Scotland ridge, changing oceanic mixing parameters,
and applying a regional freshwater flux adjustment at high northern latitudes.
The main purpose of these adjustments is to maintain a robust
Atlantic meridional overturning circulation which collapses in the original model release.
The paper describes the present-day control run of the adjusted model (referred to as "CCSM2/T31x3a") which
is brought into climatic equilibrium by applying a deep-ocean acceleration technique. The accelerated integration
is extended by a 100-year synchronous phase.
The simulated meridional overturning circulation has a maximum of 14×106 m3 s−1 in
the North Atlantic. The CCSM2/T31x3a control run is evaluated against observations and simulations with other
climate models. Most shortcomings found in the CCSM2/T31x3a control run are identified as "typical problems" in
global climate modelling. Finally, examples (simulation of North Atlantic hydrography, West African monsoon)
are shown in which CCSM2/T31x3a has a better
simulation skill than the latest low-resolution Community Climate System Model release, CCSM3/T31. |
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