CMAQv5.4 Release Notes: Process Analysis - fisidi/CMAQ GitHub Wiki
Introduction of Budget Reporting Tool
Ben Murphy, U.S. Environmental Protection Agency
Type of Update: New Feature
Release Version/Date: CMAQv5.4
Description:
The existing Process Analysis module outputs process rates for variables or families of variables on a gridded domain. The Budget Reporting Tool added here outputs as a text file (CCTM_BUDGET_xxx.txt), the domain-wide process rates and total abundance change for every variable or family requested by the user in the CMAQ_Control_Misc.nml file.
The output produced by the Budget Tool is quite powerful when applying or developing CMAQ. It can be used to better understand the large-scale source and loss pathways of individual trace species or families of species. For example, the fraction of a species that is transported out of the domain versus lost by dry or wet deposition is immediately accessible as a function of output time step. Additionally, one can use this output to diagnose potential errors if, for example, the Budget Tool reports emissions or chemical production of a species and the developer knows it should not be possible.
Output is produced for every output time step (generally hourly). Units for both gases and particles are in kilograms per output time step.
Significance and Impact: No impact on results for the cases tested.
References: N/A
Internal PRs: PR#810, PR#634, PR#669
Resolve omission of organic condensable vapors from aerosol process analysis
Ben Murphy, U.S. Environmental Protection Agency
Type of update: Bug Fix
Release Version/Date: CMAQv5.4
Description:
The flux of every condensable inorganic and organic vapor should be aggregated and saved in the process analysis arrays for aerosol condensation (i.e. COND). This procedure was overlooked for the organic species, although it was implemented for the inorganics.
Significance and Impact: This is particularly important for ISAM and the Budget Tool which will use these net changes in aerosol processing to perform source apportionment and some domain-wide totals.