I/O API OPEN3 File Types

[usepa]

I/O API OPEN3 File Types

[bnmurphy]

This has been addressed, temporarily, with the run script option "DISP". Setting it to "delete" will get rid of all output and logs files before running CMAQ. That update is undergoing internal review currently and will then be pushed to the repo.

[cjcoats]

This should be a consistent FSUNKN3 all the way through:
From the I/O API documentation (https://www.cmascenter.org/ioapi/documentation/all_versions/html/OPEN3.html):

FSUNKN3==4 for read/write/update of unknown (new vs. old)
files. If file does not exist, create it;
else check for consistency with user-supplied
file description.
...
For FSUNKN3, if the file already exists, the file type, dimensions, time step and variables supplied by the caller must match those on the file. The caller-supplied starting date and time must be a legal output time step in the time step sequence found on the file: for example, if the starting time from the file header is 1997012:120000, and the time step is one hour (10000), then opening this file FSUNKN3 with a caller-supplied starting date and time of 1997012:180000 is OK (that would be time step number 7 for the file-header time step sequence) but a caller-supplied 1997011:120000 is not, since it is before the starting date and time from the file itself.