test anomaly forcing and bias correction modes in datm

[mvertens]

[billsacks]

@mvertens Can you clarify? Do you mean adding a system test that covers these?

[billsacks]

@ekluzek do you know anything about this and whether it might have been done?

[ekluzek]

I'm pretty sure it hasn't been done. But both modes are important and adding system tests for them in the cdeps test list would be really good to do.

[ekluzek]

In CTSM we have a test-mod directory that is labeled for Anomaly Forcing, but is actually doing bias correction. The user_nl_datm changes are:

bias_correct = 'BC.CRUNCEP.GPCP.Precip'

We also need one that exercises the anomaly_forcing namelist item

[ekluzek]

Note a CTSM related issue is here:

https://github.com/ESCOMP/CTSM/issues/1396

[billsacks]

@ekluzek we're assigning you to this since @mvertens probably won't be able to do it.