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Features of CMAQv5.0.1

CMAQ News

• Bug Fixes in CMAQv5.0

• Aerosols

  • AERO6: 6th generation CMAQ aerosol module
  • PMFINE split into 9 new species
  • ISORROPIA2 for aerosol thermodynamics
  • Primary organic aerosol aging
  • In-line windblown dust model
  • Updated SOA yield parameterization

• Gas-phase Chemistry

  • CB05 with updated toluene chemistry
  • Addition of SAPRC-07 mechanism option
  • Updates to the in-line photolysis module

• Clouds

  • CCTM cloud module was updated to simulate subgrid clouds only when the meteorological driver uses a convective cloud parameterization

• Vertical Diffusion

  • Default read of C-staggered wind components from MET_DOT_3D
  • Corrected component-wise shear to properly use B-staggered winds
  • Modified eddy diffusivity for stable conditions
  • Reduced the minimum eddy diffusivity from 0.5 m²/s to 0.01 m²/s, and from 2.0 m²/s to 1.0 m²/s for urban areas

• Vertical Advection

  • A new method for computing the vertical velocity has been implemented that follows the omega calculation in WRF but uses CMAQ's advection schemes (PPM) to compute horizontal mass divergence

• Lightning NOx

  • In-line and off-line lightning NOx options can estimate the air quality impacts of lightning NOx emissions through the tropospheric column.

• Dry Deposition

  • Bidirectional exchange of NH₃
  • Mesophyll resistance added to the CCTM dry deposition routine m3dry
  • NO₂ deposition velocity updates
  • MOSAIC: Run-time option for output of land-use-specific deposition velocity and flux

• Multipollutant Modeling

  • Includes multipollutant chemical mechanisms and species for gas, aqueous, aerosols, air toxics, mercury, and sea salt
  • Bidirectional exchange of Hg⁰

• Two-way Coupled WRF3.3 and CMAQv5.0

  • Simulated aerosols from CCTM provide direct feedback to the WRF radiation calculations

CMAQ 5.0.1 Released

CMAQv5.0.1 includes several bug fixes to CMAQv5.0 and a new two-way coupled WRF-CMAQ model. See the Release Notes for a complete description of this release.

CMAQv4.7.1 (June 2010)

CMAQv4.7.1 includes several updates to the model infrastructure and science algorithms. Important new features include diagnostic tools, such as DDM, sulfate tracking, and primary carbon apportionment. See the Release Notes for a complete description of this release.

NERL releases CMAQ article (November 2009)

The EPA National Exposure Research Lab (NERL) released a feature article on CMAQ on their website in November 2009. The article highlights the advances made by EPA in using CMAQ to study air quality.

Beta version of CMAQ v4.7.1 Operational Guidance Document (OGD) Now Available

The first ever Operational Guidance Document for CMAQ is now available in HTML and PDF formats. Changes are still being made daily to this document, so please consider it as a beta version. We welcome any feedback you have about the CMAQ OGD. Please direct feedback to cmas@unc.edu.

MCIPv3.6 (March, 2010)

MCIPv3.6 encompasses all changes since the last official release of MCIP (version 3.4.1). Users are encouraged to update to this version of MCIP, particularly for WRF-based applications. See the Release Notes for a complete description of this release.

CMAQ Training in Sofia, Bulgaria

CMAS trainers traveled to Sofia, Bulgaria in August 2006 to teach CMAQ to modelers from government and university groups around Europe. Sponsored by the ACCENT initiative, the special workshop was attended by over 30 scientists and included tutorials on SMOKE

ACCENT-CMAS August 2006 CMAQ class

MCIP version 4.1

The meteorology-chemistry interface processor converts MM5 and WRF output to CMAQ and SMOKE-compatible format.

Download the MCIP version 4.1 from the CMAS Center to take advantage of the latest updates to the program.