Comments (9)
FYI @pwongpan @aekiss - There are some tweaks going into Icepack (and therefore CICE) re congelation ice formulation when using mushy thermodynamics. It accounts for the liquid fraction when forming new ice through congelation, and therefore reduces the basal heat flux (i.e. less heat is removed from the ocean) which should give reduced (i.e more realistic?) frazil formation.
Details are in the Plante et al 2024 paper and CICE-Consortium/Icepack#494
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I hadn't envisaged using the old scheme in CICE6 (I assumed we'd go straight to the multi-layer version), but maybe @pwongpan had different plans?
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@aekiss @anton-seaice Thanks again, Anton, for the updates. I agree with Andrew we will go straight to the multi-layer BGC to improve, in particular, summer sea ice algal phenology.
BTW, I would like to try zbgc option in ACCESS-OM2 BGC which is also available also on CICE5 we are using (see a screenshot below).
@aekiss did you experiment turn this on before?
Then we could compare the two multi-layer schemes between ACCESS-OM2 and ACCESS-OM3. This could be a great comparative opportunity. What do you think? Thanks again Team.
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The only ice BGC experiment I've been involved with is 01deg_jra55v140_iaf_cycle4
, which used these zbgc
parameters: https://github.com/COSIMA/01deg_jra55_iaf/blob/01deg_jra55v140_iaf_cycle4/ice/cice_in.nml#L135-L153
tr_brine = .false.
so it looks like zbc
wasn't activated.
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There is the complication for ESM3 when coupled to the UM that we will not be able to use Mushy layer ice but still have to use the bl99 option for ACCESS-CM3 coupling. Though @pwongpan did discuss last year that in the longterm there may be a way to couple mushy in its not the way we are doing it at the moment as its much more complicated. This may be an issue to think about in these discussions. But I am sure the first step is to compare how ice BGC working in ACCESS-Om2 v ACCESS-OM3
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There are also technical issues to be overcome before ACCESS-OM3 can do ocean-ice BGC coupling.
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@anton-seaice @aekiss Thanks again for the heads up. Do we already have the option to tweak the turbulent ocean-sea ice nutrient exchanges according to Duarte et al. (2022) too? I think these two implementations could go along together.
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Thanks @anton-seaice, sounds interesting.
@pwongpan do you know whether Duarte's code changes have been merged into the main codebase? I searched for Bottom_turb_mix
in CICE and Icepack but didn't find it.
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@aekiss It seems to be a fork hosted on Zenodo, not in the main codebase: https://zenodo.org/records/5795034 with "This code is in a fork derived from the CICE Consortium repository (https://github.com/CICE-Consortium, last access: 26 January 2022).".
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Related Issues (20)
- Alignment with OMIP for CMIP7
- JRA55do v1.5.0 for IAF configs for new OMIP for CMIP7 HOT 2
- JRA55do v1.5.0 for RYF configs
- Update SSS restoring to match WOA2023 HOT 17
- River and iceberg runoff mapped to incorrect locations HOT 14
- Update components for v0.4.0 HOT 8
- New PE layout breaks 1 deg configs HOT 6
- Configuration comparison table HOT 2
- can't find executable HOT 3
- [0.25deg] update PE layout HOT 13
- Update configurations for changed input location
- Mesh checks in driver
- Runoff redistribution
- Update config URLs
- Rename `CORE_IAF_JRA55do` datm `datamode` HOT 1
- Use `payu clone` in docs
- Postprocessing for standardised output naming HOT 2
- Cleaning up configuration histories
- Regularly run MOM6-CICE6/doc/update_doc.sh
- Calving flux via iceberg distribution map HOT 1
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