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CMAQv5.3.3 Release Notes

CMAQv5.3.3 User's Guide
Tutorials on installing and running CMAQ - Tutorials on running CMAQ, WRF-CMAQ, and CMAQ-ISAM test case.
Frequently asked questions for upgrading to the latest CMAQ version - Updated for v5.3.3 release.
Frequently asked questions for upgrading to the latest MCIP version - Updated for v5.3.3 release.
CMAQv5.3.3 Known Issues - Updated after the v5.3.3 release to alert users of issues that will be addressed with the next release.

Summary of CMAQv5.3.3 Updates

The Community Multiscale Air Quality (CMAQ) Model version 5.3.3 is a minor update to CMAQv5.3 that includes multiple bug fixes. These updates include restoration of windowing capability, allowing users to provide gridded input files which were larger in horizontal extent than the simulated domain. This release also includes a new version of the WRF-CMAQ coupled system with a streamlined build process. Users of WRF-CMAQ are strongly encouraged to try the latest version. 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.

Summary of CMAQv5.3.2 Updates

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.

Summary of CMAQv5.3.1 Updates

The Community Multiscale Air Quality (CMAQ) Model version 5.3.1 is a minor update to CMAQv5.3 that includes multiple bug fixes and a few feature additions.

Summary of CMAQv5.3 Updates

The Community Multiscale Air Quality (CMAQ) Modeling System, version 5.3, is a major update. CMAQv5.3 includes several changes to the science algorithms in the base model (CCTM), as well as updates to instrumented models, pre-processors, post-processors and utilities. CMAQv5.3 was primarily developed by the U.S. EPA, and it includes contributions from research partners. The enhancements to the CMAQ modeling system since the previous release (CMAQv5.2.1) are summarized below.

Instrumented Models

Chemistry

Photochemistry

Photolysis Rates

New Aerosol Modules AERO7 and AERO7i

Other Aerosol Processes

Aqueous and Heterogeneous Chemistry

Transport Processes

Air-Surface Exchange

Emission Updates

Process Analysis

Structural Improvements

Diagnostic Options

Pre-processors, Post-processors, and Utilities