The atmospheric component of CCSM is the Community Atmosphere Model (CAM). While being the atmospheric model used in the Community Climate System Model, it can also be run as a standalone atmosphere model. The most current version is 3.1, 3.0 being the fifth generation of NCAR atmospheric GCM. On May 17, 2002, its name was changed from the NCAR Community climate Model to reflect the role of the atmosphere model in the new fully coupled climate system.[7] It shares the same horizontal grid as the land model of CCSM: a 256x128 regular longitude/latitude global horizontal grid (giving a 1.4 degree resolution). It has 26 levels in the vertical