CMAQ Data#
Test Case Data#
Benchmark/tutorial data for the CMAQv5.5 release are available from the CMAS Data Warehouse. The input and output files are stored on Amazon Web Services (AWS) Open Data Registry. CMAQv5.5 benchmark input is the same as CMAQv5.4, provding a July 1-2, 2018 case over the Northeast US. CMAQv5.5 comes with new output data for running several different model configurations (links below). Tutorials are provided for using the benchmark data to test running of the base CMAQ model with either the CB6r5 or CRACMMv2 mechanisms, WRF-CMAQ, CMAQ-ISAM, and CMAQ-DDM. The input datasets include a grid mask file for the United States (GRIDMASK_STATES_12SE1.nc). The grid mask file is used for running the ISAM test case, or to test out regional emissions scaling with DESID. The input datasets also include an ocean file with variables needed to use the cb6r5_ae7 and cb6r5m_ae7 mechanisms. See the Ocean File tutorial for more information on changes to the required ocean file input beginning in v5.4.
In addition, a full set of inputs for 2018 are provided for the 12US1 domain (299 column x 459 row x 35 layer, 12-km horizontal grid spacing) on AWS, including emissions compatible with both the CB6r5 and CRACMMv1.0 chemical mechanisms. Note that the 12US1 inputs are netCDF-4/HDF5 compressed files to substantially reduce file sizes. Through testing at the EPA, we’ve noticed that certain domains encounter model crashes from reading in large amounts of compressed netCDF data. A work around for those cases is uncompressing the data manually via nccopy 1 or m3cple (compiled with HDF5) before running the CMAQ simulation.
CMAQ Version |
Data Type (Size) |
Domain |
Simulation Dates |
Data Access |
Link |
Tutorial |
|---|---|---|---|---|---|---|
MPAS-CMAQ |
Input (215 GB) |
Global (uniform 120) |
Jan 1, 2017 |
|||
v5.4 CB6r5 |
Input (6.1 TB) |
12US1 |
Jan 1 - Dec 31, 2018 |
|||
v5.4 CB6r5 |
Input (10.3 GB) |
Northeast US |
July 1 - 2, 2018 |
|||
v5.5 CRACMM2 |
Input (6 GB) |
12NE3 |
July 1 - 2, 2018 |
|||
v5.5 CRACMM2 |
Output (19 GB) |
12NE3 |
July 1 - 2, 2018 |
|||
v5.5 CB6r5 M3Dry |
Output (15 GB) |
12NE3 |
July 1 - 2, 2018 |
|||
v5.5 CB6r5 STAGE |
Output (16 GB) |
12NE3 |
July 1 - 2, 2018 |
|||
v5.5-ISAM CB6r5 M3Dry |
Output (52 GB) |
12NE3 |
July 1 - 2, 2018 |
|||
v5.5-DDM3D CB6r5 M3Dry |
Output (16 GB) |
12NE3 |
July 1 - 2, 2018 |
|||
v5.5 CRACMM2 |
Input |
12US1 |
Dec 2017- Dec 2018 |
|||
v5.5 CRACMM2 |
Output ( 1.9 TB) |
12US1 |
Dec. 22, 2017 - Jan 2 2018 |
CMAQ Input and Output Data#
The CMAS Center Data Warehouse cataloges publicly-available CMAQ-ready input files for a range of years and domains
EQUATES Data#
Meteorology, emissions, and CMAQ air pollutant and deposition estimates from the EPA’s Air Quality Time Series (EQUATES) Project are available for 2002-2019
Measurement-Model “Fused” CMAQ Outputs#
CMAQ output is often combined, or “fused”, with observed air quality measurements to remove any consistent model biases prior to using the model predictions for a particular application.