CMAQv5.3.3

CMAQv5.3.3 is a minor update to CMAQv5.3 that includes multiple bug fixes. This release includes a new version of the WRF-CMAQ coupled system with a streamlined build process. Additionally, MCIP users should note that starting with this release we are aligning the version numbering between CMAQ and MCIP, i.e., the MCIP updates included in this release are labeled MCIPv5.3.3.

CMAQv5.3.2

CMAQv5.3.2 includes significant updates to the CMAQ Integrated Source Apportionment Method (ISAM) and multiple minor fixes to address issues identified in CMAQv5.3.1. The new CMAQ-ISAM version includes substantial updates to the gas-phase chemistry apportionment algorithms that improves both physical and numerical aspects of the method. Users of ISAM are strongly encouraged to update to CMAQv5.3.2.

CMAQv5.3.1

CMAQ model version 5.3.1 is a minor update to CMAQv5.3 that includes multiple bug fixes to both CMAQ and MCIP (released as MCIP version 5.1), as well as a feature addition to the Detailed Emission Scaling Isolation and Diagnostic (DESID) module to allow for the definition of chemical, region and stream families.

CMAQv5.3

CMAQv5.3, the latest version of the Community Multiscale Air Quality modeling system (release date August 27 2019), includes many new scientific and use-oriented features.

Science Features:

• Updated chlorine chemistry
• Updated OMI data through 2017, new photolysis relevant diagnostic variables exported (e.g. AOD, single-scattering albedo, etc)
• Extended Kinetic Mass Transfer Module for cloud chemistry (KMT2; optional)
• Consolidated anthropogenic secondary organic aerosol into reduced number of species
• Revised biogenic secondary organic aerosol yields for alpha-pinene ozonolysis to substantially increase monoterpene derived SOA predicted by the model.
• Added water uptake by organic compounds
• Revised deposition parameterizations for gas and aerosol uptake.
• Introduced STAGE model which treats tiled deposition fluxes as a function of all land use types in a grid cell (optional).

User-Oriented Features:

• New comprehensive User's Guide now available!
• Improved and expanded capabilities for the Integrated Source Apportionment Method (ISAM).
• Introduced new Detailed Emission Scaling, Isolation, and Diagnostics module (DESID).
• Revised log file for enhanced transparency and clarity.
• Introduced vertical extraction module for isolating, for example, ozone sonde data without printing full 4D grid.
• Improved process analysis with Integrated Reaction Rate (IRR) functionality for all mechanisms and aerosol sub-process accounting.

See the Release Notes for more details regarding these updates.

CMAQv5.3 Beta

CMAQv5.3, the latest version of the Community Multiscale Air Quality modeling system (release date June 2019), includes many new scientific and use-oriented features.

Science Features:

• Updated chlorine chemistry
• Updated OMI data through 2017, new photolysis relevant diagnostic variables exported (e.g. AOD, single-scattering albedo, etc)
• Extended Kinetic Mass Transfer Module for cloud chemistry (KMT2; optional)
• Consolidated anthropogenic secondary organic aerosol into reduced number of species
• Revise biogenic secondary organic aerosol yields for alpha-pinene ozonolysis to substantially increase monoterpene derived SOA predicted by the model.
• Added water uptake by organic compounds
• Revised deposition parameterizations for gas and aerosol uptake.
• Introduced STAGE model which treats tiled deposition fluxes as a function of all land use types in a grid cell (optional).

User-Oriented Features:

• Introduced new Detailed Emission Scaling, Isolation, and Diagnostics module (DESID).
• Revised log file for enhanced transparency and clarity.
• Introduced vertical extraction module for isolating, for example, ozone sonde data without printing full 4D grid.
• Improved process analysis with Integrated Reaction Rate (IRR) functionality for all mechanisms and aerosol sub-process accounting.

See the Release Notes for more details regarding these updates.

CMAQv5.2

CMAQv5.2, the latest version of the Community Multiscale Air Quality modeling system (release date June 2017), includes the following new features:

New windblown dust emission model: This is a physics-based model that incorporates an innovative dynamic relationship for the surface roughness length relevant to small-scale dust generation processes (Foroutan et al., 2017). The new model has been evaluated and shown to compare much better with observations than previous dust emission components in CMAQ.

New gas-phase photochemistry mechanism: Updated Carbon Bond chemical mechanism (CB6r3) added to CMAQv5.2 includes a better treatment of rural and remote chemistry, which is particularly important for modeling compliance strategies for a lowered National Ambient Air Quality Standard (NAAQS). CMAQv5.2 also includes an extension to the CB05 version of the Carbon Bond mechanism for modeling oceanic halogen chemistry in hemispheric simulations.

New pathways to organic aerosol: New sources of secondary organic aerosol have been added to the model (heterogeneous uptake of glyoxal and methylglyoxal in the Carbon Bond chemical mechanism version 6, referred to as CB6) and properties of traditional secondary organic aerosol have been updated (Pye et al., 2017). The volatility of both secondary and primary organic compounds are now treated consistently with each other and the available literature. A new model speciesHelpspeciesAn individual molecule or chemical compound. has been added to account for the organic aerosol compounds resulting from combustion processes, which are missed by the former parameterizations. This new species is constrained with available intensive and routine field observation data (Murphy et al., 2017).

CMAQv5.2Gamma

Introduces several bug and feature updates to CMAQv5.2Beta. Incorporates additions to documentation as well.

CMAQv5.2Beta

CMAQv5.2Beta_09Nov2016

CMAQv5.2Beta includes a wealth of updates, particularly for modeling …

CMAQv4.7.1 Release

I am testing out zenodo

Community Multiscale Air Quality Model version 4.7.1 (June 2010)

CMAQ is an active open-source development project of the U.S. EPA Atmospheric Science Modeling Division that consists of a suite of programs for conducting air quality model simulations. CMAQ is supported and distributed by the CMAS Center.

CMAQ combines current knowledge in atmospheric science and air quality modeling with multi-processor computing techniques in an open-source framework to deliver fast, technically sound estimates of ozone, particulates, toxics, and acid deposition.

Release Notes: https://www.cmascenter.org/cmaq/documentation/4.7.1/RELEASE_NOTES.txt

Full documentation available at https://www.github.com/USEPA/CMAQ/tree/4.7.1