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Is there any component configuration that allows the percentage of natural vegetation to vary with time ?

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Xueli Huo

Member
Hi,

I am using CLM5 with the input surface data surfdata_0.9x1.25_78pfts_CMIP6_simyr2000_c170824.nc
PCT_NATVEG (total percent natural vegetation landunit) and PCT_NAT_PFT (percent plant functional type on the natural veg landunit) are constant through time.
Is there any component configuration for CLM5 that allows the percentage of natural vegetation to vary with time ?
And in which case (CLM_FATES ?) the percentage of natural vegetation is the necessary restart variable stored in restart file for CLM ?

Sincerely,
 
O

oleson

Keith Oleson
CSEG and Liaisons
Staff member
Generally, the compsets with "HIST" or "SSP" in the name, e.g., IHistClm50BgcCrop, allow for natural vegetation (and crop) to vary with time.

You will see this in the lnd_in for such a case. The changes in vegetation are specified by the flanduse_timeseries file.

&dynamic_subgrid
do_harvest = .true.
do_transient_crops = .true.
do_transient_pfts = .true.
flanduse_timeseries = '/glade/p/cesmdata/cseg/inputdata/lnd/clm2/surfdata_map/landuse.timeseries_0.9x1.25_hist_78pfts_CMIP6_simyr1850-2015_c170824.nc'
/

I *think* that the pft (and column and landunit) weights variables on the restart file are necessary for restarts, i.e., variables that are read in using subroutine subgridRest_write_and_read contained within subgridRestMod.F90.
 
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