system. Development The first version of CCSM was created in 1983 as the Community Climate Model (CCM). Over the next two decades it was steadily improved and was renamed CCSM after the Climate System Model (CSM) components were introduced in May 1996. In June 2004 NCAR released the third version, which included new versions of all of the submodels. In 2007 this new version (commonly given the acronym CCSM3 or NCCCSM) was used in the IPCC Fourth Assessment Report, alongside many others. In May 2010 NCAR released CCSM version4 (CCSM4). On June 25, 2010 NCAR released the successor to CCSM, called the Community Earth System Model (CESM), version1.0 (CESM1), as a unified code release that included CCSM4 as the code base for its atmospheric component. References External links CCSM4 CCSM3 CCSM2 CCSM1 Community Atmosphere Model (CAM), atmospheric component of CCSM Numerical climate and weather models