CMAQ Release Notes: PYTOOLS

shp2cmaq: Create CMAQ-Ready File from Shapefile

Barron Henderson, U.S. Environmental Protection Agency
Type of update: New Pre-Processing Tool
Release Version/Date: CMAQv5.5

Description: This Notebook uses geopandas and cmaqsatproc to create IOAPI-like files for CMAQ. The overall process requires a shapefile with attributes and a GRIDDESC file. It produces variables that specify grid cell fractional coverage by each unique value of a specified attribute. It also produces total and dominant attribute variables. The total specifies the fraction coverage of any attribute. The dominant variable specifies which attribute has the largest area coverage.

Significance and Impact: No impact on core model results. The significance of this tool is to provide a simple shapefile processor to use DESID masking feature. Spatial mask files can also be used for ISAM simulations or as part of post-processes model output.

Internal PRs: PR#904

DMSCHLO: Augment the Standard Ocean File for Marine Chemistry

Barron Henderson, U.S. Environmental Protection Agency
Type of update: New Pre-Processing Tool
Release Version/Date: CMAQv5.4

Description: Depending on the chemical mechanism selected, the traditional "Ocean" file maybe required to contain temporal "DMS" and chlorophyll-a (CHLO) concentrations for dimethyl sulfide (DMS) and halogen chemistry, respectively. To create these fields for input, a new Python tool called "DMSCHLO" is released to augment standard CMAQ "Ocean" files with this data.

Significance and Impact: No impact on core model results. The significance of this tool is to provide an easy to use tool in which to augment the standard "Ocean" file for use with CCTM. See the Ocean File Tutorial for further information.

Internal PRs: PR#903