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NorESMhub / CTSM

Community Terrestrial Systems Model (includes the Community Land Model of CESM)
http://www.cesm.ucar.edu/models/cesm2.0/land/
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CLM branch for NorESM2.2 - check SoilHydrologyMod.F90 #22

Open DirkOlivie opened 3 years ago

DirkOlivie commented 3 years ago

Hi @kjetilaas

I have made a new branch of CLM to be used in NorESM2.2, based on what is used in CESM2.2 (tag release-cesm2.2.01). The new branch is called release-cesm2.2.01-Nor.

Could you check whether the one NorESM-specific modification (in file src/biogeophys/SoilHydrologyMod.F90) should be implemented again, or whether CESM has it now standard present in its new CTSM releases (release-cesm2.2.01)?

Thanks. Dirk

kjetilaas commented 3 years ago

Hi @DirkOlivie,

Sorry for the slow response here. The modification we made to NorESM2 was a fix to something that turned out to be a combination of a bug (causing unphysical snow depth increase) and just incomplete model physics which would require substantial changes to the code to solve. I have checked the new branch, and it includes the bug fix (see here for details: https://github.com/ESCOMP/CTSM/issues/573). The simplified physics (where surface water turns into snow when it freezes) is still there, but I don't think our modification solves this in a very good way either. So I would suggest we don't keep it.