Right way to check and then change a namelist parameter?

Submitted by cecelia.deluca… on Mon, 03/16/2020 - 23:50
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Medium-range Weather Application

Before building a case, I want to check the default value of a namelist variable, then set its value in the user_nl_ufsatm file.

How do I check the default value of the namelist variable before the input.nml file is created?

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Submitted by Linlin.Pan on Tue, 03/17/2020 - 18:59

there are some default settings for v15p2 and v16beta can be found at src/model/parm

ccpp_v15p2_c96.nml.IN 

ccpp_v16beta_c96.nml.IN  model_configure.IN  v15p2_c96.nml.IN  v16beta_c96.nml.IN

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Submitted by cecelia.deluca… on Wed, 03/18/2020 - 04:33

Thanks Linlin, found them. Do you know if that is the only way to see the default values, or if there is some way of querying them through the workflow?

 

 

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Submitted by carson on Wed, 03/18/2020 - 15:47

The default values used by the workflow are found at:

src/model/FV3/cime/cime.config/*xml

these should be consistent with the ones Linlin referenced.  I don't know of a way to view these defaults other than generating the namelist using CIME tools.  

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Submitted by jedwards on Wed, 03/18/2020 - 19:41

From the case directory running ./preview_namelists will generate the namelists for the run.  This is normally run by case.submit, but you can also run it from the command line.   Run it once before editing user_nl_ufsatm and examine input.nml to see the default value, then edit user_nl_ufsatm and run it again to see the change.

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Submitted by cecelia.deluca… on Wed, 03/18/2020 - 22:02

Thanks - all very helpful. Jim, what you're describing is the kind of solution I was looking for.

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