CESM | Community Earth System Model. CESM is a community-developed, fully-coupled global climate model that provides state-of-the-art computer simulations of Earth’s past, present, and future climate states. Vital elements for CESM’s development include modern parameterizations, software engineering, and observational data sets. CESM simulation support is targeted to provide the CESM community with a single code base that enables out-of-the-box capabilities for the entire modeling process. This single code base supports model parameterization development, and minimizes computational resources.
More information is available at http://www.cesm.ucar.edu