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Progress with the CHIME coupled climate model
Alex Megann, Adrian New, Adam Blaker and Bablu Sinha
National Oceanography Centre, Southampton, UK
(Abstract received 07/13/2007 for session X)
ABSTRACT
The CHIME (Coupled Hadley-Isopycnic Model Experiment) model comprises the Hadley Centre\'s atmosphere and ice models, coupled to the Hybrid-Coordinate Ocean Model (HYCOM). CHIME is designed to be identical to the Hadley Centre\'s HadCM3 model except for its ocean component, allowing us to investigate the sensitivity of the climate to the choice of vertical coordinate in the ocean model. CHIME is being run as part of the UK RAPID THCMIP climate model intercomparison project. A 200-year control integration is now under way, and a 1% per year increasing CO2 run and a run with freshwater hosing in the North Atlantic are planned. Although the meridional overturning in the control runs of CHIME and HadCM3 is similar, CHIME shows several differences compared with HadCM3. In particular, CHIME does not show the 4 degree cold bias seen in the North Pacific in HadCM3. General comparisons will be made between CHIME and HadCM3, and in addition more detailed results will be presented on the relationship between the Atlantic overturning circulation and the steric height gradient.
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2007 LOM Workshop, Bergen, Norway, August 20-22, 2007