CMIP6 Historical simulation in CESM2.1.3

[demetray]

I am using CESM2.1.3 to try to run a simulation with CMIP6 Historical forcing I intend to initialize the model using restart files (ideally those available on NCAR Derecho) for the year 1970, and execute a simulation with a Historical compset up to the year 2015.

The CMIP6 Historical compset I have tried to use is: HIST_CAM60_CLM50%BGC-CROP-CMIP6DECK_CICE%CMIP6_POP2%ECO%ABIO-DIC_MOSART_CISM2%NOEVOLVE_WW3_BGC%BDRD
The restart files for 1970 I have tried to use are located here: /glade/campaign/cesm/cesmdata/inputdata/cesm2_init/b.e21.BHIST.f09_g17.CMIP6-historical.001/1970-01-01

I have no problem building and submitting the configuration. I have also confirmed that the restart files have successfully been copied into the run directory. However, the model fails immediately when it tries to execute (seemingly before the first time step). The most recent log file is the cesm.log (preceded by lnd.log), and an error arises:

check_dim ERROR: mismatch of input dimension
62336 with expected value 62125 for variable landunit
Did you mean to set use_init_interp = .true. in user_nl_clm?
(Setting use_init_interp = .true. is needed when doing a transient run using an initial conditions file from a non-transient run, or a non-transient run using an initial conditions file from a transient run, or when running a resolution or configuration that differs from the initial conditions.)

1. What does this error mean? How do I resolve this?
2. Can you clarify what values to set for MODEL_START_DATE and RUN_REFDATE? If I use a MODEL_START_DATE of 1970-01-01 with the Historical compset, will the forcing on the first year of the simulation be characteristic of the year 1970, or will it be characteristic of the typical first year of a Historical simulation (1850)?

 

[hplin]

Thanks for writing demetray.

1. The error appears to indicate that the land model's initial conditions file (specified in the "finidat" variable) is not an exact match of the time that the model is starting at. Could you check which land model initial conditions file you are using (if not specified in the user_nl_clm, you may find it in CaseDocs/lnd_in.)? If that is indeed the initial conditions file you want to use for the land model, try setting use_init_interp = .true. in user_nl_clm.

2. The forcings will be based on the input files provided. Based on your configuration I think it would be for 1970.