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Sea ice trapped in isolated cells adjacent to ice shelves #746

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xylar opened this issue Dec 6, 2023 · 6 comments · Fixed by #752
Closed

Sea ice trapped in isolated cells adjacent to ice shelves #746

xylar opened this issue Dec 6, 2023 · 6 comments · Fixed by #752
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bug Something isn't working ocean

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@xylar
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xylar commented Dec 6, 2023

In the SORRM 1950 control experiment, we're seeing 90,000 m of sea ice in one grid cell adjacent to the Ronne ice-shelf:
image
image

This completely corrupts the time series of sea-ice volume:
iceVolume.pdf

This appears to be because the cell has all land vertices, meaning it is completely isolated from a B-grid perspective. I think this is because we widen channels where land is present but we don't modify landIceMask in the same way. This needs to be fixed in the next SORRM and other Polar-focused meshes.

@xylar xylar added bug Something isn't working ocean labels Dec 6, 2023
@proteanplanet
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We have trapped B-cells elsewhere on our meshes but they don't do that. If coupler areas didn't quite add to 1, or if land runoff was influencing the result, we could see something like that. 90km of ice would suggest that physics are not controlling this result.

@proteanplanet
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One other thought: Non-linear weightings have impacted certain freshwater quantities for V3, and weighting are being reverted to linear for precipitation. Please check which type of weightings you are using, and perhaps try again once the weightings are set to linear as indicated for PR E3SM-Project/E3SM#6094.

@xylar
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xylar commented Dec 6, 2023

@proteanplanet,

This is the E3SM v2.1 SORRM 1950 control run, so nothing to do with E3SM v3. This is a simulation I'm looking at for my AGU poster.

@proteanplanet
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Thanks @xylar In that case, this problem may well be fixed with V3 - many bugs have been taken out.

@xylar
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xylar commented Dec 6, 2023

Yep, let's hope so but we can also avoid creating these situations in the mesh in the first place when we make a new SORRM mesh.

@darincomeau
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just to point out this shouldn't be a runoff-driven issue, as AIS runoff should be disabled in this configuration (CRYO1950), but worth double-checking.

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3 participants