CMAQ version 5.0.2 (Apri l 2014 release) Technical Documentation- cmaqwiki 

# CMAQ version 5.0.2 (April2014 release) Technical Documentation From cmaqwiki Page 1 of2

Re fe r 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 - Apri l 2015 • 2 Base Documentation • 3 Changes and new features • 3.1 In strumented Models • 3.2 Communi ty 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 th e model provide CMAQ users with diagnostic too ls for help in interpreting model performance and results. Community versions of the mode l includ e 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 detail s of the changes included in CMAQv5.0.2 are provided below. 

### CMAQ DDM Code Patch - April 2015 The aerosol sens itivity 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 solutio ns for a more sim ple 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 stab le model solutions. The re lease inc ludes the updates from the September 2014 patch.
http: / /www .airqualitymodeling.org/cmaqwiki/index.php?title = CMAQ_ version

_ 5.0.2 _ %28A... 611/2015CMAQ version 5.0.2 (April2014 release) Technical Documentation- cmaqwik i 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 • I ntegrated Source Apportionment Me th od • 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 _D ATA files • Sulfate inhibition effect in aqueous chemistry • Gas-phase chemistry • WRF land use opt ion s • NH3 bidirect i ona l 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 Retrieved from "http://www.airqualitymodeling.org/cmaqwiki/index.php?title=CMAQ_ version_5.0.2 _ (Apri l_2 014_re le ase)_Techn i cal_Documentat i on&o ldid= 574"

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