Spinning up the CLM4.0 Carbon-Nitrogen Dynamic Global Vegetation Model (CNDV spinup)

To spinup the CLM4.0 CNDV model -- you first follow the procedures above to spinup the CN model. Then you take the CN initial state file you created for the spinup with just CN, and run CNDV for 200 more years. We've provided such spunup files for two resolutions (f09 and f19) and two time-periods (1850 and 2000), so in this example we will use the files provided to start from. We've also provided a spinup file at f19 resolution for CNDV, hence the following is NOT required when running at f19. If you were to start from your own CLM4.0-CN spunup files -- the procedure would require some modification. There are a few compsets using CNDV, so you can either use them, define a long compset name, or in env_build.xml change CLM_CONFIG_OPTS to -bgc cndv.

Example 4-8. Example CLM4.0 CNDV Spinup Simulation

> cd scripts
> ./create_newcase -case CNDV_spinup -res f09_g16 -compset ICN -mach yellowstone_intel
> cd CNDV_spinup
# Set run type to startup and do a cold start and CLM_CONFIG_OPTS to CNDV
> ./xmlchange RUN_TYPE=startup,CLM_CONFIG_OPTS="-bgc cndv"
# Make the default primary history file annual and add an annual 1D vector auxiliary file
# By putting the following in a user_nl_clm file.
> cat << EOF >> user_nl_clm
 hist_nhtfrq = -8760, -8760
 hist_mfilt  =     1, 1
 hist_fincl2 = 'TLAI', 'TSAI', 'HTOP', 'HBOT', 'NPP'
 hist_dov2xy = .true., .false.
> ./cesm_setup
# NOTE: If you were using your own CN spinup files you would edit the namelist to use it
# $EDITOR Buildconf/clm.buildnml.csh
# Now build and run as normal
> ./CNDV_spinup.build
# The following sets RESUBMIT to 10 times, STOP_N/STOP_OPTION to 20 years in env_run.xml (you could also use an editor)
> ./xmlchange RESUBMIT=10,STOP_OPTION=nyears,STOP_N=20
# Make sure you turn archiving on, so you save your files to long term archival
> ./xmlchange DOUT_L_MS=TRUE
> ./CNDV_spinup.submit

In a data analysis tool you should examine the auxiliary file and examine the pfts1d_wtgcell to see where and what types of vegetation have been established. See the caution in Example 1-7 for more information on visualizing and analyzing 1D vector fields.

Note: CNDV also writes out two vector fields to "hv" auxiliary files, on an annual basis by default.

Note: We've provided a spinup file for CNDV at f19 resolution, you could also use interpinic to interpolate this file to other resolutions.