MOZART: Model for OZone and Related chemical Tracers

MOZART chemical mechanism

The chemical mechanisms used in MOZART, CAM-chem and WACCM are developed, maintained and updated at NCAR, with collaborations from Forschungszentrum Jülich and the community.  The MOZART-4 chemical mechanism and model description are published in Emmons et al. (2010).  The MOZART-4 mechanism contains a detailed description of tropospheric inorganic chemistry and of organic species with 3 carbons or less, and a reasonably thorough treatment of isoprene chemistry. Larger alkanes and alkenes, terpenes, and aromatics are also included in the mechanism, albeit with lumping and simplification.  

MOZART-T1:  The MOZART tropospheric chemistry mechanism has been updated to include an expansion of the isoprene oxidation scheme, splitting lumped aromatics and terpenes to individual species, and a more detailed representation of organic nitrates. 

MOZART-TS1: The T1 tropospheric mechanism, with halogen compounds and reactions to represent stratospheric chemistry.

TSMLT1:  A comprehensive mechanism for use in WACCM, including chemistry for the Troposphere, Stratosphere, Mesosphere and Lower Thermosphere.

The species and reactions included in the T1-TS1-TSMLT1 family of mechanisms are provided in these documents: Species List and Table of Reactions.  A full description of the mechanism and its implementation in CESM2 is in preparation (Emmons et al., to be submitted to JAMES).


MOZART-4 is the final version of the global chemical transport model MOZART.  The source code is freely available to the community, however it is no longer being developed or supported.  Documentation on Downloading and Running MOZART-4 Source Code

The capabilities of MOZART-4, with numerous improvements, are available in CAM-chem and we recommend that it be used instead of MOZART-4.

MOZART-4 output for several years is made available for regional model boundary conditions from the WRF-chem webpage.

Several tools are available for processing MOZART-4 output or inputs.

WACCM chemical forecasts

Chemical Forecasts from WACCM are run each day, providing a 3-day forecast of global tropospheric composition. 




ACOM | Atmospheric Chemistry Observations & Modeling