F2000climo compset with time-varying input files

[atmospherics]

Hi everyone,

I've been working with the F2000climo compset and noticed that the input files seem to contain only twelve months of data, which I assume is circulated annually by the model. However, I would like to introduce time-varying SST and CO2 data in my simulations. To achieve this, I'm considering switching to the FHIST compset but pointing most input files (other than SST and CO2) to the same ones used in the F2000climo configuration. For the SST and CO2, I would use time-varying input files instead.

My questions are:

1. Is this approach feasible within CESM?
2. Is it common practice to use FHIST in this way, essentially combining aspects of F2000climo with time-varying input files?
3. Are there any potential issues or additional configurations I should be aware of when doing this?

I appreciate any insights or suggestions from those who have experience with similar setups.

Thanks in advance!!

 

[hannay]

You can use the compset FHIST for that purpose.
Use the F2000climo namelist to see how to see the variables you don't want time-varying.

For instance the `ext_frc_` , you will have to change from:
ext_frc_type = 'INTERP_MISSING_MONTHS'
to
ext_frc_type = 'CYCLICAL'
ext_frc_cycle_yr = 2000
and maybe to the ext_frc_specifier.

YOu can figure what to change by comparing the 2 namelists.