Create NHIST compset for NorESM3alphaX

[adagj]

@kjetilaas @DirkOlivie

We will try to make a NHIST compset for NorESM3. We try to use CMIP7 forcing and if files are missing, we will use CMIP6 forcing files for the missing files.

@kjetilaas Can you please link to the relevant CTSM issue? I couldn't find it.

@dirk DO we have a forcing repository? Or do we make an issue in the CAM repo?

Tasks:

• [ ] Make a NHIST compset (Fates-SP, Fates-nocomp)
• [ ] Test a hybrid start from one of the dev simulations

[DirkOlivie]

I have tried with noresm3_0alpha03 the historical compset

HIST_CAM70%LT%NORESM%CAMoslo_CLM60%FATES-NOCOMP_CICE_BLOM%HYB%ECO_MOSART_DGLC%NOEVOLVE_SWAV_SESP

For CAM, it used CMIP6 forcings. The simulations worked when doing two modifications.

1. For CAM using a different boundary condition file for H2O :

ubc_file_path = '/cluster/shared/noresm/inputdata/atm/cam/chem/ubc/b.e21.BWHIST.f09_g17.CMIP6-historical-WACCM.ensAvg123.cam.h0zm.H2O.1849-2014_c240604.nc'

The original file had no data for January 1850 (the file started at 18500201).

2. For CLM, it did not work when prescribing an initial file finidat. Without finidat, the simulation was able to run. @kjetilaas, do you have any idea how we might solve this? The case-directory on betzy is :

/cluster/projects/nn9560k/olivie/cases-noresm3.0-test/nhist.ne30_tn14.hybrid_fates-nocomp.3.0a03.20250427

3. Some other modifications should be done (but do not affect the ability to run): the surface emissions for CAM are currently using 2x2 instead of 1x1 input files.