Update w3srcemd.F90 to correct bug related to TR1

[Biao-Zhao]

To calculate the increment of spectrum, we should use the source term VSTR rather than VDTR

Pull Request Summary

Description

Issue(s) addressed

Commit Message

Check list

• Branch is up to date with the authoritative repository (NOAA-EMC) develop branch.
• Checked the checklist for a developer submitting to develop.
• If a version number update is required, checked the updating version number checklist.
• If a new feature was added, a regression test for testing the new feature is added.

Testing

• How were these changes tested?
• Are the changes covered by regression tests? (If not, why? Do new tests need to be added?)
• Have the matrix regression tests been run (if yes, please note HPC and compiler)?
• Please indicate the expected changes in the regression test output, (Note the list of known non-identical tests.)
• Please provide the summary output of matrix.comp (matrix.Diff.txt, matrixCompFull.txt and matrixCompSummary.txt):

[sbanihash]

Thank you @Biao-Zhao for your work on this fix. Everything looks good. I approve the changes.

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********************* non-identical cases ****************************

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mww3_test_03/./work_PR2_UNO_MPI_e (1 files differ)
mww3_test_03/./work_PR2_UQ_MPI_d2 (13 files differ)
mww3_test_03/./work_PR3_UQ_MPI_e_c (1 files differ)
mww3_test_03/./work_PR2_UNO_MPI_d2 (10 files differ)
mww3_test_03/./work_PR1_MPI_e (1 files differ)
mww3_test_03/./work_PR3_UQ_MPI_d2_c (15 files differ)
mww3_test_03/./work_PR3_UQ_MPI_e (1 files differ)
mww3_test_03/./work_PR2_UQ_MPI_e (1 files differ)
mww3_test_03/./work_PR3_UNO_MPI_e_c (1 files differ)
mww3_test_03/./work_PR1_MPI_d2 (8 files differ)
mww3_test_03/./work_PR3_UNO_MPI_d2_c (17 files differ)
mww3_test_03/./work_PR3_UNO_MPI_d2 (16 files differ)
mww3_test_03/./work_PR3_UNO_MPI_e (1 files differ)
mww3_test_03/./work_PR3_UQ_MPI_d2 (16 files differ)
mww3_test_09/./work_MPI_ASCII (0 files differ)
ww3_tp1.9/./work_PR3_UQ_MPI (7 files differ)
ww3_tp1.9/./work_PR3_UQ (7 files differ)
ww3_tp2.10/./work_MPI_OMPH (6 files differ)
ww3_tp2.16/./work_MPI_OMPH (4 files differ)
ww3_tp2.6/./work_ST4_ASCII (0 files differ)
ww3_ufs1.3/./work_a (3 files differ)

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matrixCompSummary.txt
matrixCompFull.txt
matrixDiff.txt

[JessicaMeixner-NOAA]

Re-requesting a review from @sbanihash as I noticed that two tests:

ww3_tp1.9/./work_PR3_UQ_MPI (7 files differ)
ww3_tp1.9/./work_PR3_UQ (7 files differ)

that have unexpected changes.

[sbanihash]

Thank you Jessica for pointing that out. I will take a look. ww3_tp1.9 is the only regtest that uses TR1 switch and change is expected based on the nature of this PR. I will do further checks to make sure they are expected. @Biao-Zhao have you done any testing with and without your changes to report any expected differences we will see?

[Biao-Zhao]

Hi, @sbanihash, I didn't do any testing regarding this. I encountered this issue while going through w3srcemd.F90. Based on the treatment of other source terms, VSTR is expected to compute the contribution of TR1 to the increment of SPEC. Therefore, I think it's necessary to report this bug. If I got this wrong, feel free to point it out.

[sbanihash]

Thank you @Biao-Zhao for you response. I agree with the change and while I was reviewing your PR and looking at other source terms as you pointed out, this change was needed in my opinion as well. But as I had also mentioned to @JessicaMeixner-NOAA this PR will change answers for tests that use TR1 switch in the sense that it is intended to correct a mistake in calculating the increment spectrum.

[JessicaMeixner-NOAA]

If changes to tests with TR1 are expected, let's please update the PR template to separate the changes expected with this PR versus the regression tests that normally have b4b issues.

For example, the question to Please indicate the expected changes in the regression test output, (Note the list of known non-identical tests.) should be:

ww3_tp1.9/./work_PR3_UQ_MPI (7 files differ)
ww3_tp1.9/./work_PR3_UQ (7 files differ)