Fail to read emission file

I/O API
1

Dear all,

I’m using python netCDF4 to prepare CMAQ emission files, but the model couldn’t read.
So I tried Matlab and I got the same error, too.Here is the error message:

 netCDF error number  -49  processing file "GR_EMIS_001"
 NetCDF: Variable not found


 *** ERROR ABORT in subroutine gridded_files_se on PE 001
 Could not open GR_EMIS_001                      file

PM3EXIT: date&time specified as 0
Date&time specified as 0

Does anyone know how to fix this?

Yunqing

CTM_LOG_001.v533_intel_d02_20210727.txt (8.3 KB)
emis.txt (5.4 KB)

2

From the I/O API home page https://cjcoats.github.io/ioapi/index.html or https://www.cmascenter.org/ioapi/documentation/all_versions/html/index.html:

The Models-3 I/O API is A programming interface, not a data format !!
I/O API files are not synonymous with “netCDF files” !!

and treating it as a data format is NOT SUPPORTED: you don’t know the internal data structures used to protect the integrity of the data and you clearly got it wrong.

By analogy, do you attempt to write MS-Word documents with a hex editor? You don’t know the internal data structures there, either.

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3

Thank you @cjcoats !

After your reply, I used python to create my CMAQ emission files according to GRIDDED IOAPI Files format and it worked!
IOAPI/NetCDF restrictions link is below:

Yunqing

1 Like