Add new RRSwISC6to18E3r5 ocean and sea-ice mesh

[xylar]

Long name: RRSwISC6to18L80E3SMv3r5

This RRS (Rossby-radius scaled) mesh has:

• 6 km resolution near the poles
• 18 km resolution at the equator

This is a proposed E3SM v3 (E3) high resolution (near-eddy-resolving) mesh. This is revision 5 (r5) of the mesh, which includes a flood fill of the land-ice mask to ensure correct connectivity (MPAS-Dev/compass#800). The minimum water-column thickness has been set to 20 m. These are the primary differences compared with #6143.

The mesh was created using compass, specifically this PR:
MPAS-Dev/compass#801
A compass tag will be created for the mesh as soon as the PR is merged.

The mesh and forthcoming simulation results will be reviewed here:
https://acme-climate.atlassian.net/wiki/spaces/OO/pages/4219863057/Review+RRSwISC6to18E3r5

G- and B-case simulations will begin shortly and analysis will be posted here and on the review page as soon as it is available.

Relevant discussion of this mesh can be found here:
E3SM-Ocean-Discussion#86

[BFB] for all currently tested configurations

[xylar]

@jonbob, this is ready for you to update namelist options based on what actually worked in your simulations.

[xylar]

@cbegeman, @erinethomas, @proteanplanet and @vanroekel, could you provide details of any relevant review you have performed of the mesh and simulations in the review page linked above and approve when you are ready here?

@jonbob, could you provide links to the simulation page(s) and relevant analysis here and on the review page when you can?

[vanroekel]

@xylar and/or @jonbob we made a few changes for mesh stability in G-cases (e.g. smaller btr_dt and enabling a bit of del2). Should those defaults be changed here? Or should there be a separate E3SM PR?

[xylar]

@vanroekel, that's what I meant above by this:

this is ready for you to update namelist options based on what actually worked in your simulations.

[vanroekel]

Oh goodness, sorry for missing the obvious @xylar

[xylar]

No worries!

[jonbob]

Simulation page for a 23+ year run with this mesh is here: 20240426.HRr5_5-G.chrysalis

[rljacob]

Can we start merging this? I'd like to get it on master so we can start testing hi-res (just needs to run for a couple of days).

[rljacob]

@cbegeman @vanroekel @proteanplanet @erinethomas can one of you approve this?

[proteanplanet]

Approved for mesh quality as indicated in analysis posted at https://acme-climate.atlassian.net/wiki/spaces/OO/pages/4219863057/Review+RRSwISC6to18E3r5.

[xylar]

@rljacob, new meshes are a big, big deal. We really need all to approve.

[xylar]

@vanroekel and @cbegeman, it looks like you have approved in the confluence document. Can you approve here as well. @erinethomas, could you approve both places, let us know if you need more time, or let us know if you would rather not review?

[xylar]

@jonbob, the conflict in namelist_defaults_mpaso.xml looks trivial to resolve. Let me know if you'd like me to rebase and take care of it or if you prefer to do that during merge.

[cbegeman]

Approving on the basis of mesh analysis in several G-cases and the necessity of increasing minimum water column thickness from analysis of previous meshes.

[vanroekel]

approved by visual inspection and from extensive evaluation of several G-cases by myself and others.

[erinethomas]

I haven't had a chance to review any of this yet - I will have a review complete by the end of the day.

[xylar]

Thank you, @erinethomas! And thanks @vanroekel, @proteanplanet and @cbegeman for reviewing!

[jonbob]

Thanks @xylar -- if it looks trivial, I'm happy to take care of it when I merge

[erinethomas]

I was unable to find enough time today to go through a detailed review with my own tools, however, given the time limits, I approve this mesh based upon a review of all the mesh figures posted here: https://acme-climate.atlassian.net/wiki/spaces/OO/pages/4219863057/Review+RRSwISC6to18E3r5.

[jonbob]

all new files staged on the inputdata repo

passes:

• ERS_Ld5.T62_oQU120.CMPASO-NYF.chrysalis_intel
• ERP_Ld3.ne30pg2_r05_IcoswISC30E3r5.WCYCL1850.chrysalis_intel.allactive-pioroot1

merged to next

[jonbob]

merged to master

[xylar]

Woohoo! Thanks to everyone involved in making support for this mesh, initial condition and the simulations with it possible!