Move MLD diagnostics out of MOM_diabatic_aux and add the option to use non-surface density in MLD_003 #691
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theresa-morrison
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| @@ -3248,6 +3252,15 @@ subroutine diabatic_driver_init(Time, G, GV, US, param_file, useALEalgorithm, di | |||
| 'Squared buoyancy frequency below mixed layer', units='s-2', conversion=US%s_to_T**2) | |||
| CS%id_MLD_user = register_diag_field('ocean_model', 'MLD_user', diag%axesT1, Time, & | |||
| 'Mixed layer depth (used defined)', units='m', conversion=US%Z_to_m) | |||
| if (CS%id_MLD_003 > 0) then | |||
| call get_param(param_file, mdl, "HREF_FOR_MLD", CS%ref_h_mld, & | |||
| "Refernced depth used to calculate the potential density used to find the mixed layer depth "//& | |||
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## dev/gfdl #691 +/- ##
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+ Coverage 36.99% 40.90% +3.90%
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Files 272 42 -230
Lines 82433 5286 -77147
Branches 15421 1013 -14408
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+ Misses 46246 2939 -43307
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After discussing with Bob, Brandon, and Alistair some changes have been made to this PR incuding fixing typos, whitespace, and line length. The commit history has been cleaned up so that two clean commits can be merged in. Since the OMIP7 MLD definition was unclear when this PR was created it is possible that more changes to the MLD diagnstcs may be needed for OMIP7. In addition, the optional arguments that I added to |
A new parameter is added to diagnoseMLDbyDensityDifference that allows a user to specify a reference for the surface density that is not the top model layer. This feature should make the MLD_003 diagnostic more consistent with the de Boyer Montégut MLD climatology. In addition, new diagnostics have been added to save the actual depth of the density used and the "surface" density used in the MLD calculation. These options have only been added for the MLD_003 option.
Move the calculation of density difference and energy difference based MLD diagnostics out of MOM_diabatic_aux and into a new module MOM_diagnose_MLD.F90. Because this new module includes only the calculation of mixed layer depths that will be primarily used as diagnostics, it will be in the diagnostics subfolder. This change will allow the diagnose MLD routines to be used in the generic tracers.
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This PR has passed pipeline testing at https://gitlab.gfdl.noaa.gov/ogrp/mom6ci/MOM6/-/pipelines/24341 with the expected warnings about new diagnostics and new runtime parameters. |
This PR moves the
diagnoseMLDbyEnergyanddiagnoseMLDbyDensityDifferenceout of theMOM_diabatic_auxmodule and into a newly createdMOM_diagnose_mldmodule which is located in the diagnostics folder. This is to allow the MLD diagnostic codes to be used within the generic tracer routines.In addition, a new parameter is added to
diagnoseMLDbyDensityDifferencethat allows a user to specify a reference for the "surface" density that is not the top model layer. This feature should make the MLD_003 diagnostic more consistent with the de Boyer Montégut MLD climatology which uses a reference depth of 10m (see deBoyer Montegut et al. 2004 and 2022). In addition, new diagnostics have been added to save the actual depth of the density used and the "surface" density used in the MLD calculation. These options have only been added for the MLD_003 diagnostic.The new parameter added
HREF_FOR_MLDis the target depth for the "surface" density used in the density difference calculation. The default is zero which means the density of the surface layer is used. IfHREF_FOR_MLDis not present whendiagnoseMLDbyDensityDifferenceis called, the density of the surface layer is used. Where the ocean is shallower thanHREF_FOR_MLDthe density in the surface layer is used. The pressure atHREF_FOR_MLDis used as the reference pressure for the potential density.Two new diagnostics have been added:
MLD_003_refZandMLD_003_refRho. The first is used mainly for debugging and should be equal toHREF_FOR_MLDexcept where the ocean is shallower. The other diagnosticMLD_003_refRhois the two-diimensional potential density at the "surface" which is used in the density difference. This is saved because a user may want to compare the density difference betweenHREF_FOR_MLDand the density in the top layer.These changes do not change the model solution but if
HREF_FOR_MLDis not zero, it will change the MLD_003 diagnostic.A one year (1993) test in the Northeast Pacfic (NEP) regional domain showed deeper MLD when
HREF_FOR_MLD=10.0(h=0 vs. h=10). Overall the MLD is too shallow compared to the de Boyer Montégut 2022 MLD climatology (DBM on the plot below), so a slight deepening is likely to help with the bias. The figure below show the annual average MLD for the NEP domain in meters for 1993.Thanks to @amoebaliz for this test domain.