GFDL CM2.X (Geophysical Fluid Dynamics Laboratory Coupled Model, version 2.X) is a coupled atmosphere-ocean general circulation model (AOGCM) developed at the NOAA Geophysical Fluid Dynamics Laboratory in the United States. It is one of the leading climate models used in the Fourth Assessment Report of the IPCC, along with models developed at the Max Planck Institute for Climate Research, the Hadley Centre and the National Center for Atmospheric Research. The solutions of these GFDL CM2 models are described in a series of papers published in the Journal of Climate in 2006.

Read more about GFDL CM2.X:  Model Construction, Simulation Description