Add Antarctic Ice Sheet meshes for MALI

[matthewhoffman]

This PR introduces two new meshes of the Antarctic Ice Sheet for MALI:

• high res production mesh: mpas.ais4to20km
• low-res testing mesh: mpas.ais8to30km

[matthewhoffman]

@jonbob , I created this PR in progress for adding new Antarctic meshes. I've added the mesh files to /lcrc/group/acme/public_html/inputdata/glc/mpasli and I have added the entries for the mapping files to cime_config/config_grids.xml but I left the entries blank until we get the mapping files made. I'm happy to discuss how to proceed.

@xylar , should we add E3SM grid specs and mapping files for oQU240wLI (or create an oQU120wISC) for this PR too?

[xylar]

Yes to oQU240wLI. There's no appetite in the project for a new IcoswISC240 or an equivalent 120 km mesh.

[xylar]

Following up, it only makes sense to create mapping files for the 8 km AIS mesh to the oQU240wLI mesh, not the 4 km AIS. This would just be for lightweight testing.

[xylar]

@matthewhoffman, do the new meshes also need to be added here?
https://github.com/E3SM-Project/E3SM/blob/a5273f081fd29c5d9a21a9d3e92f16618aaefab2/driver-mct/cime_config/config_component.xml#L1088
and here?
https://github.com/E3SM-Project/E3SM/blob/a5273f081fd29c5d9a21a9d3e92f16618aaefab2/driver-moab/cime_config/config_component.xml#L1088

[xylar]

Also presumably here:
https://github.com/E3SM-Project/E3SM/blob/a5273f081fd29c5d9a21a9d3e92f16618aaefab2/components/mpas-albany-landice/cime_config/buildnml#L85

[xylar]

Presumably, you just haven't got that far yet -- this is a work in progress, as you said.

[matthewhoffman]

@czender, @chloewhicker, and @stephenprice , this PR will add our current AIS meshes and I'd like to add model_grid specifications and mapping files to support IG and BG cases with the firn model. Can you confirm what land and atmosphere (data for IG or active for BG) grids you would want supported for that?

[czender]

@matthewhoffman We anticipate our immediate simulations all running on the LR trigrid mesh: r05 for land, and ne30pg2 for atmosphere. You and @stephenprice would know better whether and how soon we need to ensure the firn model runs well with the v3 HR meshes (land r025, atm ne120pg2).

[matthewhoffman]

Thanks, @czender. So I think this spec covers your needs. (there is a corresponding one for the second AIS MALI mesh as well) Can you confirm? Are you ok using the v3 IcoswISC30E3r5 mask? (I think that was already sorted in the GIS development push but just checking)

    <model_grid alias="ne30pg2_r05_IcoswISC30E3r5_ais8to30" compset="_MALI">
      <grid name="atm">ne30np4.pg2</grid>
      <grid name="lnd">r05</grid>
      <grid name="ocnice">IcoswISC30E3r5</grid>
      <grid name="rof">r05</grid>
      <grid name="glc">mpas.ais8to30km</grid>
      <grid name="wav">null</grid>
      <mask>IcoswISC30E3r5</mask>
    </model_grid>

[czender]

Yes, @matthewhoffman, that is the LR configuration we expect for run our simulations on for both IG and BG cases.

[matthewhoffman]

Replaced by E3SM-Project#6440