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Fix instability in 30+ day longruns of CMIP runs with TripolarGrid + ConservativeRegridding. #1994

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@akshaysridhar

30 day time average - see artifacts in the temperature plot, specifically near SE-Asia coastlines, and a patch in the Pacific Ocean (temperature maximum balloons to >40degC over the ~30day run)

SST
https://github.com/user-attachments/assets/f5ca421b-b195-42bd-b391-c48be2ba5a3f

Zonal surface velocity
https://github.com/user-attachments/assets/8b93e05e-03f1-4e11-b64b-93be2d8a4501

Meridional surface velocity
https://github.com/user-attachments/assets/4bbb9bc9-8077-4205-bb37-fb6fd8ce008a

Sea-surface displacement:
https://github.com/user-attachments/assets/fe9c2a99-9981-4b4d-a0fb-f30b380c6b88

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