Change CLM50%BGC in BSSP126 to CLM50%SP, set final to landtimeseries file or default input?

[CGL]

Hello, I have been trying to separate biophysical and biochemical effects using different components in CLM under the SSP126 scenario.My CESM version is 2.1.3 and CLM version is CLM5. I attempted to change the long name of BSSP126 in CESM from BGC to SP and link my own generated landtimeseries data to the CLM module. The code is as follows:

./create_newcase --case /public/home/acsqu89hc3/apprepo/cesm/2.1.3-intelmpi2021_hdf5_netcdf4/case/BSSP126_ClimateSP_userLanduse_0617 --compset SSP126_CAM60_CLM50%SP_CICE_POP2%ECO%ABIO-DIC_MOSART_CISM2%NOEVOLVE_WW3_BGC%BDRD --res f09_g17 --machine sugon --run-unsupported

and I linked the landtimeseries on my own in CLM:

flanduse_timeseries = '/public/home/uesr_landtimeseries.nc'
use_init_interp = .true.

However, when I ran `./case.build`, I received the following error message:

Calling /public/home/acsqu89hc3/apprepo/cesm/2.1.3-intelmpi2021_hdf5_netcdf4/app/components/clm//cime_config/buildnml
ERROR: Command /public/home/acsqu89hc3/apprepo/cesm/2.1.3-intelmpi2021_hdf5_netcdf4/app/components/clm/bld/build-namelist failed rc=255
out=CLM adding use_case 1850-2100_SSP1-2.6_transient defaults for var 'sim_year' with val '1850'
CLM adding use_case 1850-2100_SSP1-2.6_transient defaults for var 'sim_year_range' with val '1850-2100'
CLM adding use_case 1850-2100_SSP1-2.6_transient defaults for var 'ssp_rcp' with val 'SSP1-2.6'
CLM adding use_case 1850-2100_SSP1-2.6_transient defaults for var 'use_case_desc' with val 'Simulate transient land-use, and aerosol deposition changes from 1850 to current day with historical data, and then to 2100 with the CMIP6 SSP1-2.6 scenario'
err=ERROR : CLM build-namelist::CLMBuildNamelist::setup_logic_initial_conditions() : use_init_interp is set BUT finidat is NOT, need to set both

The error indicates that the `use_init_interp` flag is set, but the `finidat` variable is not specified. Both need to be set for the model to run correctly.

What type of file does finidat refer to here? When running a transient simulation, shouldn't providing the landtimeseries file be sufficient, just like in CLM5.0 BGC?
If I want to achieve the separation of BGP (biophysical) and BGC (biochemical) effects, how should I set it up? Perhaps I could use the default fininitial from BSSP126?

Thank you in advance!

 

[CGL]

Additionally, I have noticed that the finidat used in BSSP126-CLM5.0%SP has 16 PFTs, whereas in BSSP126-CLM5.0%BGC, it uses 64 PFTs. This means that I need to convert my landtimeseries file to 16 PFTs in order to use the SP component of CLM5.0. I am wondering if there is a way to set the finidat for the SP component of CLM5.0 to match the 64 PFTs used in the BGC component. In that case, I wouldn't need to convert my landtimeseries file.

 

[oleson]

finidat is the file that is used to initialize the CLM, e.g., soil, snow, vegetation, etc. It is not related to the landuse timeseries or surface data.
I think you will need a 16pft version of the surface dataset and landuse timeseries file to run SP.