Hi I’m having an issue with CMAQ reading in the second day’s Emissions file. The first day (2019243) runs fine, but for the second day I get this error: Processing Day/Time [YYYYDDD:HHMMSS]: 2019244:000000 Which is Equivalent to (UTC): 0:00:00 Sunday, Sept. 1, 2019 Time-Step Length (HHMMSS): 0…

The CMAQ run script that EPA distributes is set up for multiple executions of the model, with each run being 24 hours. You have set NSTEPS to 1440000, or 144 hours, equal to 6 days. It is possible to do a single execution for 6 days (or far longer), but you need to have all your meteorology, emissio…

The attachment did not come through, at least for me using Chrome. The error message indicates it is GR_EMIS_001, which is a gridded emissions file, rather than a point source file. Please specify what version of CMAQ you are using. What do you mean when you say “tested running straight from the …

It looks as though the GR_EMIS_001 file for this run does not contain all the data it needs. This message indicates that the program is trying to process date&time 2019244:010000 and failing because the requested time-step is not available in the file. As a secondary check, what happens when you u…

Thanks for the quick response, I am already running CMAQ5.3.1, so I think this is not the issue, and yes these are gridded emissions files. When I say I ran it from the second day what i mean is - If I run CMAQ from 2019243 it runs for 2019243 then fails when trying to open the GR_EMIS_001 for 201…

This makes sense now, I was trying to run multiple days with a single execution, but had only seen the single day benchmark example files. I hadn’t realised all days had to be contained in the same IC, BC MET and EMIS files to do this. Thank you very much!

You may be able to use the I/O API File-Set File Lists to combine multiple 24 hr emis/bc/ic files into a single logical filename. 'Multiple files which have the same structure (type, dimensions, list of variables, time step), and which cover an extended time period may be opened under a single logi…

CMAQ fails with 2nd day EMIS file

CMAQ

lizadams June 11, 2020, 3:21pm 2

If you are using CMAQv5.3, then this issue contains a discussion about the error, and the best fix is to upgrade to CMAQv5.3.1. Incorrect timestepping for elevated point source emissions

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CMAQ fails with 2nd day EMIS file

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