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Comparison of GFDL\'s CM2G Coupled Climate Model with CM2.1 and CM2M
Robert Hallberg, Alistair Adcroft, Matthew Harrison, Anand Gnanadesikan
NOAA/GFDL & Princeton University
(Abstract received 05/12/2009 for session X)
ABSTRACT
GFDL is preparing two new 1-degree ocean resolution coupled climate models for submission to the IPCC AR5 - CM2M and CM2G - both based on the atmospheric model from of GFDL\'s CM2.1 coupled climate model. The CM2G coupled climate model differs from CM2.1 and CM2M only in their ocean components - an isopycnal coordinate Generalized Ocean Layered Dynamics (GOLD) configuration in the case of CM2G, compared with a Z-coordinate MOM4.0 configuration for CM2.1 and a Z*-coordinate MOM4.1 configuration for CM2M. The interior ocean watermass structure of CM2G is markedly improved over CM2.1 and CM2M, as is the depth (and presumably the controlling dynamics) of the deep branch of the Atlantic Meridional Overturning circulation. By contrast, the sea surface temperatures exhibit great similarities between the models. This talk compares the 1990-forcing control states of the CM2.1 and CM2G climate models, and examines the response of the two models in simulations where the CO2 concentration is increased from a preindustrial value by 1%/year to doubling.
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2009 LOM Workshop, Miami, Florida Jume 1 - 3, 2009