*+HOR_VISC_ANSWER_DATE logic fix #759
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When HOR_VISC_ANSWER_DATE was introduced to replace HOR_VISC_2018_ANSWERS on August 4, 2022 as a part of github.com/NOAA-GFDL/pull/179, the logic was incorrectly specified, using the older form with the newer answer date and vice versa, because `(CS%answer_date > 20190101)` was used instead of `(CS%answer_date < 20190101)`. (Curiously, using exactly 20190101 actually gives the intended result.) This commit modifies this logic so that the older (mildly dimensionally inconsistent) version is now being used for answer dates between 20190102 and 20241201, but a very late answer date uses the corrected form. The offending block of code is only used when USE_MEKE is true and the Rossby number scaling of the biharmonic energy source is enabled by setting MEKE_BACKSCAT_RO_C > 0, which does not appear to be very common. To avoid logging the description of this ugly new logic in MOM_parameter_doc files where it does not impact the solutions, new logic was added to limit the logging of HOR_VISC_ANSWER_DATE. Also, as there are no known non-Boussinesq cases with this combination of MEKE parameters, the minimum value of HOR_VISC_ANSWER_DATE was changed to 20241201 when the model is in non-Boussinesq mode. Because this bug went undetected when it was first introduced, it probably is not widely used, and it might make sense to obsolete HOR_VISC_ANSWER_DATE and eliminate the older, inconsistent block of code. This commit could change answers for answer dates that are above 20241201 with the MEKE Rossby number scaling enabled via MEKE_BACKSCAT_RO_C > 0.
Hallberg-NOAA
added
bug
marshallward
approved these changes
Nov 26, 2024
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Gaea regression: https://gitlab.gfdl.noaa.gov/ogrp/mom6ci/MOM6/-/pipelines/25592 ✔️ 🟡 |
This was referenced Nov 27, 2024
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When HOR_VISC_ANSWER_DATE was introduced to replace HOR_VISC_2018_ANSWERS on August 4, 2022 as a part of github.com//pull/179, the logic was incorrectly specified, using the older form with the newer answer date and vice versa, because
(CS%answer_date > 20190101)was used instead of(CS%answer_date < 20190101). (Curiously, using exactly 20190101 actually gives the intended result.)This commit modifies this logic so that the older (mildly dimensionally inconsistent) version is now being used for answer dates between 20190102 and 20241201, but a very late answer date uses the corrected form. The offending block of code is only used when USE_MEKE is true and the Rossby number scaling of the biharmonic energy source is enabled by setting
MEKE_BACKSCAT_RO_C > 0, which does not appear to be very common. To avoid logging the description of this ugly new logic in MOM_parameter_doc files where it does not impact the solutions, new logic was added to limit the logging ofHOR_VISC_ANSWER_DATE. Also, as there are no known non-Boussinesq cases with this combination of MEKE parameters, the minimum value ofHOR_VISC_ANSWER_DATEwas changed to 20241201 when the model is in non-Boussinesq mode. Because this bug went undetected when it was first introduced, it probably is not widely used, and it might make sense to obsoleteHOR_VISC_ANSWER_DATEand eliminate the older, inconsistent block of code. This commit could change answers for answer dates that are above 20241201 with the MEKE Rossby number scaling enabled viaMEKE_BACKSCAT_RO_C > 0.