Adding VIIRS-M Radiance Data Assimilation in GEOS

[ahrem1234]

This PR is primarily for adding VIIRS radiance observation in GEOS.
VIIRS radiance data for channels M12-16 are read, and that for channels M12, M15, and M16 are assimilated.

This PR is to achieve the following purposes:

1. add read_viirs.f90
2. correct calcsun module
3. correct surface states (e.g. skin temperature) reading - needs further investigation

+) only use water surface for BC coeff. update

[github-actions]

Label error. Requires at least 1 of: 0 diff, 0 diff trivial, Non 0-diff, 0 diff structural, 0-diff trivial, Not 0-diff, 0-diff, automatic, 0-diff uncoupled. Found:

[github-actions]

Label error. Requires at least 1 of: 0 diff, 0 diff trivial, Non 0-diff, 0 diff structural, 0-diff trivial, Not 0-diff, 0-diff, automatic, 0-diff uncoupled. Found:

[github-actions]

Label error. Requires at least 1 of: 0 diff, 0 diff trivial, Non 0-diff, 0 diff structural, 0-diff trivial, Not 0-diff, 0-diff, automatic, 0-diff uncoupled. Found:

[rtodling]

I am looking to see if I approve this, but what I think this is missing is some type of result - even if from a single analysis test. Can something be provided here. Like, perhaps what kind of increments we get when only VIIRS is assimilated vs perhaps avhrr3_metop-b (or something)?

[rtodling]

@ahrem1234 you need to also edit the CHANGE_LOG file and add a note there about this change otherwise GIT checks will continue to fail.

[ahrem1234]

Thank you for your comments, Ricardo. I have attached some forecast scorecards and radman plots that I got from comparing CTL(x0050) to EXP(adding VIIRS on NPP and NOAA-20). I hope this helps clarify the impact of this new VIIRS radiance DA.
VIIRS_results.pptx

[ahrem1234]

@ahrem1234 you need to also edit the CHANGE_LOG file and add a note there about this change otherwise GIT checks will continue to fail.

Could you point out where I can find the CHANGE_LOG file, so that I can add the note, please? Thanks!