difference between the default land surface datasets used by FHIST and F2000climo

[AndrewY]

Hello all,

I was running CESM2.1.0 with two component sets FHIST and F2000climo, respectively. I noticed that those two compsets used different land surface datasets:

FHIST - surfdata_0.9x1.25_16pfts_Irrig_CMIP6_simyr1850_c170824.nc
F2000climo - surfdata_0.9x1.25_16pfts_Irrig_CMIP6_simyr2000_c170824.nc

Let's call them "simyr1850" and "simyr2000". It turned out they assigned different PFT fractions to each grid. I also checked the global attributes of those two datasets and found that the only difference was "Vegetation_type_raw_data_filename". For FHIST, it is mksrf_landuse_histclm50_LUH2_1850.c170629.nc. For F2000climo, it is mksrf_landuse_histclm50_LUH2_2000.c170629.nc.

I wonder how does this "Vegetation_type_raw_data_filename" contribute to the difference between the two land surface datasets and what PFT status (current, history, or climatological maybe?) do "simyr1850" and "simyr2000" represent respectively?

Thank you!

Andrew

 

[oleson]

The simyr1850 is for year 1850 and the simyr2000 is for year 2000.
The FHIST simulation has transient landcover so there should also be a file such as, e.g.,

flanduse_timeseries = '/glade/p/cesmdata/cseg/inputdata/lnd/clm2/surfdata_map/landuse.timeseries_0.9x1.25_hist_16pfts_Irrig_CMIP6_simyr1850-2015_c170824.nc'

which has vegetation information for 1850-2015. So, e.g., for year 2000, both simulations would be using data from the same Vegetation_type_raw_data_filename

 

[lby]

The simyr1850 is for year 1850 and the simyr2000 is for year 2000.
The FHIST simulation has transient landcover so there should also be a file such as, e.g.,

flanduse_timeseries = '/glade/p/cesmdata/cseg/inputdata/lnd/clm2/surfdata_map/landuse.timeseries_0.9x1.25_hist_16pfts_Irrig_CMIP6_simyr1850-2015_c170824.nc'

which has vegetation information for 1850-2015. So, e.g., for year 2000, both simulations would be using data from the same Vegetation_type_raw_data_filename

Thank you for your answer. I have a similar question.
1. Can I understand that F2000 simulates the situation of 2000, and FHIST is the dynamic situation of 1850-2000?
2. Fist - surfdata_0.9x1.25_16pfts_Irrig_CMIP6_simyr1850_c170824.nc
F2000climo-surfdata_0.9x1.25_16pfts_Irrig_CMIP6_simyr2000_c170824.nc
Does it represent the surface in 2000 and 1850? , looking forward to your answer, thank you!

 

[oleson]

1. Right. The FHIST is setup out of the box to start in 1979, but you can probably modify that to run a full historical (1850-2014)
2. Yes.