CMAQ version 5.0.2 (April 2014 release) Technical Documentation- cmaqwiki 

CMAQ version 5.0.2 (April2014 release) 

Technical Documentation 

From cmaqwiki 

Page 1 of2 

Refer to the CMAQv5.0 Technical Documentation for information on the technical features of this 

version. 

Contents 

• 1 Release Notes for CMAQv5.0.2 - May 2014 

• 1.1 CMAQ DDM Code Patch - April 2015 

• 2 Base Documentation 

• 3 Changes and new features 

• 3.1 Instrumented Models 

• 3.2 Community Contributions 

• 3.3 Base Model Changes 

Release Notes for CMAQv5.0.2 - May 2014 

CMAQ version 5.0.2 is an incremental update to CMAQ version 5.0.1 that includes several changes to 

the science algorithms in the base model and new diagnostic/scientific modules. The instrumented 

versions of the model provide CMAQ users with diagnostic tools for help in interpreting model 

performance and results. Community versions of the model include new science algorithms contributed 

by development groups outside of EPA. This release also includes an update to the meteorologychemistry (WRF-CMAQ) coupled version of the model. Build instructions, how to run a model test 

case, and details of the changes included in CMAQv5.0.2 are provided below. 

CMAQ DDM Code Patch - April 2015 

The aerosol sensitivity code was updated to ensure stability and robustness for fine scale model 

applications. Propagating sensitivity through some ISORROPIA cases were found to be unstable under 

certain conditions. These cases were replaced with solutions for a more simple ion system. Other minor 

changes were made to how small numbers are handled by the sensitivity code. Sensitivity to activity 

coefficients was also found to function improperly and was disabled. Finally, updates to sensitivity of 

minor ions in aqueous chemistry were also disable to further ensure stable model solutions. 

The release includes the updates from the September 2014 patch. 

http:/ /www.airqualitymodeling.org/cmaqwiki/index.php?title=CMAQ_ version _5.0.2 _ %28A... 611/2015 
CMAQ version 5.0.2 (April2014 release) Technical Documentation- cmaqwiki Page 2 of2 

Base Documentation 

• Building and running CMAQv5.0.2 

• Building and running WRF-CMAQ Two Way Model 

Changes and new features 

Instrumented Models 

• Integrated Source Apportionment Method 

• Direct Decoupled Method 

• Sulfur Tracking 

Community Contributions 

• VBS contributed by ENVIRON International Corp. 

• APT contributed by ENVIRON International Corp. (not yet available for release) 

Base Model Changes 

• SOA yield update 

• CSQY_DATA files 

• Sulfate inhibition effect in aqueous chemistry 

• Gas-phase chemistry 

• WRF land use options 

• NH3 bidirectional exchange 

• M3DRY backward compatibility with MCIP for wind staggering 

• Vertical advection time step 

• Hg bidirectional exchange 

• Aerosol updates 

• Wind blown dust updates 

• Bidirectional NH3 dry deposition change 

• ACONC bug fix 

• PT3D diagnostic file bug fix 

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