Add draft PR of ice shelf panan

[claireyung]

1. Summary: New ACCESS-rOM3 panantarctic 4km with ice shelves config.

• Currently set to run from a restart because running from scratch requires a very short timestep, so not suitable for optimisation work. See instructions here https://github.com/claireyung/access-om3-configs/blob/dev-MC_4km_jra_ryf%2Bregionalpanan%2Bisf%2Bdraft/ice_shelf_instructions.md
• Note requires a custom mom6 executable with changes for ice shelves, currently a local version since this MOM6 symmetric with ice shelf debugging ACCESS-OM3#142 (comment) (which should be identical to my local version) didn't compile now using access-om3/pr142-17
• Based on Dev mc 4km jra ryf+regionalpanan #713 no ice shelf panan, but it diverged, so there are some upstream commits e.g. changes to authors list that I haven't added yet here
• Also has new input files (see config.yaml)
• Using the version that I ran for one year with internal tide dissipation off.
• Has known problems with frazil/heat conservation and is not well evaluated. For testing/performance use only.
• Expected cost is 20kSU/month, walltime 5:30:00/month

What has changed? Added ice shelf cavities

Why was this done? New capability

2. Issues Addressed:

3. Dependencies (e.g. on payu, model or om3-scripts)

This change requires changes to (note required version where true):

• payu:
• access-om3:
• om3-scripts:

4. Ad-hoc Testing

What ad-hoc testing was done? How are you convinced this change is correct (plots are good)?

5. CI Testing

• !test repro has been run

6. Reproducibility

Is this reproducible with the previous commit? (If not, why not?)

• Yes
• No - !test repro commit has been run.

7. Documentation

The docs folder has been updated with output from running the model?

• Yes
• N/A

A PR has been created for updating the documentation?

• Yes:
• N/A

8. Formatting

Changes to MOM_input have been copied from model output in docs/MOM_parameter_docs.short?

• Yes
• N/A

9. Merge Strategy

• Merge commit
• Rebase and merge
• Squash

[chrisb13]

Thanks so much for sharing this @claireyung !

---

Discussed with @helenmacdonald @minghangli-uni @chrisb13 @ezhilsabareesh8 (today).

@minghangli-uni is interested to have a look. He has some optimised compiler flags that could be worth trying. (Chris noted from chat with Claire at lunch that the parallel restarts would only lead to modest improvements, and that CICE/NUOPC timestep is shorter than Claire would like.) @minghangli-uni can have a look after the 25km and 100km optimisation is complete (same pipeline -- @chrisb13 @ezhilsabareesh8 are currently working on this).

[claireyung]

The above commits replace MOM_input and MOM_overrides with one MOM_input file. Have checked all 4 of the MOM_parameter_doc outputs are the same as before.

In the process, I realised there I made a typo in the MOM_override before, and we still need to turn THICKNESSDIFFUSE = False. It shouldn't be a problem because KHTH = 0 but it would be better to have it totally off. Same issue present in #713

(I guess that's why using MOM_overrides makes things at risk of mistakes... even though I find it so convenient!)

to do:

• Set THICKNESSDIFFUSE = False in MOM_input
• Fix other melt parameterisation choices after tuning experiments

[chrisb13]

Thanks for the update @claireyung.

Same issue present in #713

Is that something you're planning on copying across or would you like someone from the ocean team to do it?

[claireyung]

It's on my to do list for this afternoon, as well as removing Mom overrides in that config! Thanks for checking :)