The Community Earth System Model (CESM) is a fully coupled, global climate model that provides state-of-the-art computer simulations of the Earth's past, present, and future climate states. Please post your question to the most appropriate forum topic.
This forum is for technical and scientific questions related to the simpler model configurations within CESM, such as aquaplanet, dynamical core, SCAM etc
http://www.cesm.ucar.edu/models/simpler-models/