Alternative congelation formulation following Plante et al. 2024 #494
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eclare108213
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dabail10
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Jul 29, 2024
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Will need some changes in Icepack documentation and maybe add a test case. Also need to update the icepack interface documentation (run ./icepack.setup --docintfc). CICE will also eventually need a new namelist added. |
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See also CICE-Consortium/CICE#965 This PR and the CICE PR are ready to merge assuming we are happy leaving the old 'two-step' as the default. Please confirm that's how we want to proceed. We can always change the default later. |
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I did do a fully-coupled test here with the one-step option and the solutions are quite different. Climate changing? Maybe not, but I think this is the correct way to go. We will definitely be using this in CESM3. |
dabail10
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Aug 19, 2024
…E-Consortium#494) Add congel_freeze namelist and add 'one-step' option to the default 'two-step' option. Namelist flag congel_freeze chooses which formulation to use. The original is ‘two-step’, since only the mushy boundary moves in the first step and the phase change happens in the next step. Plante et al. (‘one-step’) moves the boundary and performs the phase change in a single time step. Maintain 'two-step' as default for now.
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Draft for Plante et al. to confirm that these changes are all that are needed, separate from their flooding/snow-ice and forcing modifications. I still need to add tests to the test suite and update the Icepack documentation, then implement and test in CICE. Suggestions for better congel_freeze option labels are welcome.
I realigned some columns while working on this. Ignore white space when looking at diffs!
Add alternative congelation formulation following Plante et al., 2024.
@mathieuslplante et al., @eclare108213
congel_freeze = ‘two-step’is BFB in the base_suite -- this is currently the default (as before).congel_freeze = 'one-step'is not BFB. Settingconserv_check = .true.does not turn up any issues.A QC comparison for CICE PR #965 shows the differences between
congel_freeze = 'one-step'and'two-step'are not climate changing in CICE standalone simulations.congel_freeze = 'one-step'Namelist flag congel_freeze chooses which formulation to use. The original is ‘two-step’, since only the mushy boundary moves in the first step and the phase change happens in the next step. Plante et al. (‘one-step’) moves the boundary and performs the phase change in a single time step.
Closes #481