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- Title
The low-resolution CCSM2 revisited: new adjustments and a present-day control run.
- Authors
Prange, M.
- Abstract
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.
- Subjects
SCOTLAND; GREENLAND; MID-ocean ridges; SUBMARINE topography; GEOGRAPHY; WATER; NATURAL resources; HYDROLOGY; OCEAN
- Publication
Ocean Science, 2008, Vol 4, Issue 2, p151
- ISSN
1812-0784
- Publication type
Article
- DOI
10.5194/os-4-151-2008