Sixth reconciliation PR from production/RRFS.v1

[grantfirl]

Identical to #198

This is @dustinswales work.

This PR adds a new diagnostic, instantaneous downward shortwave flux at the surface assuming clear-sky conditions.

#247 is combined into this PR:

Fixes this problem:

• global_nest_v1 suite: infinite cumulative surface upwelling long-wave flux ufs-weather-model#2547

It was caused by missing values (-1e+20) for sea surface temperature on wet points in input data. (Wet points are points where the CCPP wet array is true, thus indicating the surface is at least partly water.) There's a bug fix and a workaround:

1. Bug fix: In certain situations, the wet array can be mistakenly true when it should be false due to the location being 100% ice. An "else" statement corrects this.
2. Workaround: If the input sea surface temperatures (tsfco) are invalid on a wet point, the lowest model level temperature is used instead.

There is no other temperature available on those points that can reasonably be used as a sea surface temperature. The lowest model level temperature may not be a perfect analogue for the sea surface temperature, but it'll be more realistic than -1E+20 K.

[jkbk2004]

@grantfirl would it be ok to combine in #247 to this pr? no baseline change

[grantfirl]

@grantfirl would it be ok to combine in #247 to this pr? no baseline change

Yes, that is fine. I'll do this.

[jkbk2004]

all tests are done at ufs-community/ufs-weather-model#2529 @rhaesung @grantfirl @dustinswales can you go ahead to merge this pr?