Remove checksum from sfcanl_data.tileX.nc files following global_cycle.

[aerorahul]

When the sfcanl_data.tileX.nc files are created with the program global_cycle, the checksum global attribute is retained.
This checksum is bound to be incorrect (unless recalculated), when fields are updated.

This is seen when using GFSv16 CCPP SDF. The model fails after global_cycle updates the sfc_data.tileX.nc files to produce sfcanl_data.tileX.nc.

@CoryMartin-NOAA ran into this issue when he tested the cycled global-workflow with the GFSv16 configuration.

A requested solution is to delete the checksum global attribute from the sfcanl_data.tileX.nc files in the utility global_cycle.

The proposal is being tested via: https://github.com/aerorahul/UFS_UTILS/pull/new/feature/checksum

[GeorgeGayno-NOAA]

Will work this issue under this branch:
https://github.com/GeorgeGayno-NOAA/UFS_UTILS/tree/feature/checksum

[GeorgeGayno-NOAA]

@aerorahul I have logic working that will remove the 'checksum' attribute. Before I go further, should I remove 'checksum' from all records in the file, or only those records that get updated? For NoahMP, I will only update a small subset of the records in the file.

[GeorgeGayno-NOAA]

@aerorahul Please try my branch at 2c5ff01, which will remove 'checksum' for all updated records.

[aerorahul]

Thanks @GeorgeGayno-NOAA. Will give it a try.

[CoryMartin-NOAA]

Looks like this does the trick, an older version of UFS_UTILS causes the forecast to fail due to incorrect checksums, but this commit allows the model to initialize.

[GeorgeGayno-NOAA]

Looks like this does the trick, an older version of UFS_UTILS causes the forecast to fail due to incorrect checksums, but this commit allows the model to initialize.

Great. I will initiate a PR.