The Whole Atmosphere Community Climate Model (WACCM) is a comprehensive numerical model, spanning the range of altitude from the Earth's surface to the thermosphere. The development of WACCM is an inter-divisional collaboration that unifies certain aspects of the upper atmospheric modeling of HAO, the middle atmosphere modeling of ACOM, and the tropospheric modeling of CGD, using the NCAR Community Earth System Model (CESM) as a common numerical framework.  The latest version of WACCM is described in Marsh et al. (2013)WACCM-X extends WACCM to the upper thermosphere, and includes processes important to the ionosphere.

Announcements and support for running WACCM can be found on the DiscussCESM WACCM forum.  The CESM Whole Atmosphere Working Group webpage can be found at

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WACCM Near-Real-Time




ACOM | Atmospheric Chemistry Observations & Modeling