Global Chemistry Modeling

Group Lead: Dan Marsh

There are several models being developed and used in ACD for global chemistry modeling.

CAM-Chem and the Whole-Atmosphere Community Climate Model (WACCM)  are versions of the NCAR Community Earth System Model that couple the Community Atmosphere Model with chemistry based on MOZART. There are two versions of CAM-Chem, one with fully coupled chemistry and climate, and one that reads analyzed meteorological fields (GEOS-5).  WACCM has a model top that extends to ~140 km and includes a stratospheric chemical mechanism.  WACCM is particularly suited for studies from the upper troposphere through the mesosphere.

The Model for OZone and Related chemical Tracers (MOZART) is a global 3-D chemical transport model, driven by offline meteorological fields, that has been developed at NCAR, the Max-Planck-Institute for Meteorology, and NOAA/GFDL. MOZART-4 is suitable for tropospheric chemistry studies, however it is no longer being developed or supported and is superseded by CAM-chem.


  • WACCM and CAM-chem will be holding working group meetings at the upcoming 19th Annual CESM workshop June 16-19, 2014.
  • Presentations from the CAM-chem and WACCM working group meetings in February 2014 are available on the CESM WG pages (CAM-chem and WACCM).




ACD | Atmospheric Chemistry Division