Diagnostic fixes to KE_adv, KPP_OBLdepth_original #957
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
The KE_adv diagnostic is a sum of values multiplied by -1, which will assign a -0.0 value for zero-initialized states. This can lead to reproducibility problems for symmetric and nonsymmetric grids, since many intermediate calculations rely on masking of the u field and do not apply masks to subsequent steps. This can occur when a MPP domain is bordered by land, where calculations on the S and W boundaries of a symmetric grids are computed as if they are unmasked, and would be assigned a -0.0 value. For nonsymmetric grids, these values were never computed and would retain a +0.0 value. We resolve this by re-initalizing the KE_u and KE_v fields, since they are re-used as buffers for several diagnostics, and exclude masked points from the calculation. This ensures +0.0 values in any land boundaries across symmetric grids. If the masking is applied to other fields using `KE_u` and `KE_v`, then we may be able to remove the re-initialization step. While +/-0.0 are arithmetically identical in all cases, this fix will preserve bitwise reproducibility and is a step towards phasing out the `abs()` operation in the checksums.
The diagnostic KPP_OBLdepth_original requires a nonzero CS%n_smooth value, but it is currently possible to register this diagnostic even when this parameter is unset. This patch only registers the diagnostic when n_smooth is defined.
|
GitLab testing: https://gitlab.gfdl.noaa.gov/ogrp/MOM6/pipelines/8518 Internal testing has passed. |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Fixes to two diagnostics:
KE_advKPP_OBLdepth_originalDetails in commit logs.