ERA5 updated radiation corrections

[blsaenz]

Updated ERA5 shortwave, and now additionally longwave, radiation correction multipliers were developed by UCLA. These have been uploaded to the roms-tools-data repo, as ERA5_corrections.nc. Roms-tools now loads that file automatically from github instead of the older SSR_correction.nc. The 'lwrad' variable is updated similarly to the shortwave in surface_forcing.py. Docstrings and example notebooks were updated to indicate that longwave radiation is corrected in addition to shortwave, if correction is requested.

• Closes #CSD-889
• Passes pre-commit run --all-files
• Changes are documented in docs/releases.md
• New functionality has documentation

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 55.30%. Comparing base (e9cbe3c) to head (d04bb4a).

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HEAD has 6 uploads less than BASE

Flag	BASE (e9cbe3c)	HEAD (d04bb4a)
glorys-regional-invariance	1	0
without-dask	3	0
with-dask-1	1	0
with-dask-and-xesmf-1	1	0

@@             Coverage Diff             @@
##             main     #614       +/-   ##
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- Coverage   89.41%   55.30%   -34.11%     
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  Files          28       28               
  Lines        6319     6325        +6     
  Branches     1123     1124        +1     
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- Hits         5650     3498     -2152     
- Misses        378     2538     +2160     
+ Partials      291      289        -2     

Flag	Coverage Δ
glorys-regional-invariance	?
with-dask-1	?
with-dask-2	51.55% <100.00%> (+0.04%)	⬆️
with-dask-and-xesmf-1	?
with-dask-and-xesmf-2	54.95% <100.00%> (+0.04%)	⬆️
with-streaming	35.35% <12.50%> (-0.04%)	⬇️
without-dask	?

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Files with missing lines	Coverage Δ
roms_tools/datasets/download.py	80.95% <ø> (-19.05%)	⬇️
roms_tools/datasets/lat_lon_datasets.py	67.43% <ø> (-23.30%)	⬇️
roms_tools/setup/surface_forcing.py	83.64% <100.00%> (-0.01%)	⬇️

... and 24 files with indirect coverage changes

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[kthyng]

The changes look reasonable to me. One comment is that this change seems like a black box (same as when it was just a shortwave radiation correction). Is there any more information that can be provided or is that unrealistic for this?

Also the tests aren't working yet, but maybe that is related to test data generation?