Change component set

Change component set#

Exercise: Repeat the 1 month experiment with a different CLM compset

Choose which CLM compset you want to run:

  • CLM-BGC: I2000Clm60BgcCrujra
  • CLM-BGC Crop: I2000Clm60BgcCropCrujra
  • CLM-FATES SP: I2000Clm60FatesSpCruRsGs

Create a case using the selected compset using f19_f19_mt233 resolution.

Note: You will still need to use the “–run-unsupported” flag.

Check the status of the run after submitting.

Click here for hints

Are you in the right workspace?

Navigate to my_clm_code/cime/scripts before running the ./create.case command

cd /glade/u/home/$USER/code/my_clm_code/cime/scripts

Did you give your new case a new name?

You can create a new case with the command:

NEW_CASE_NAME='i2000_fates.basics'
./create_newcase --case /glade/u/home/$USER/cases/$NEW_CASE_NAME --res RES --compset COMPSET --run-unsupported

Did you navigate to the case directory to set up the case?

You can invoke case set up as follows:

cd /glade/u/home/$USER/cases/i2000_fates.basics
./case.setup

Did you remember to extend the length of the run to 1 month?

./xmlchange STOP_OPTION=nmonths
./xmlchange STOP_N=1
Click here for the solution

Create a new case i2000_fates.basics with the command:

cd /glade/u/home/$USER/code/my_clm_code/cime/scripts
./create_newcase --case /glade/u/home/$USER/cases/i2000_fates.basics --res f19_f19_mt233 --compset I2000Clm60FatesSpCruRsGs --run-unsupported

Case setup:

cd /glade/u/home/$USER/cases/i2000_fates.basics 
./case.setup

Change the queue to the ‘tutorial’ queue:

./xmlchange JOB_QUEUE=tutorial --force

Extend the length of the run to 1 month:

./xmlchange STOP_OPTION=nmonths
./xmlchange STOP_N=1

Build and submit:

qcmd -- ./case.build
./case.submit

Check the status:

qstat -u $USER

When the run is completed, look into the archive directory for: i2000_fates.basics.

Check that your archive directory on derecho (The path will be different on other machines):

cd /glade/derecho/scratch/$USER/archive/i2000_fates.basics
ls

Advanced: Comparing the namelist settings#

When you create a case, CLM uses the compset to build the namelist for each component. The namelist, lnd_in, tells CLM which input files to read and which options to turn on. A copy of the final namelist is saved in each case’s CaseDocs/ directory.

Because the compset determines these settings, comparing lnd_in between your two cases shows how the configurations differ. The diff command prints only the lines that differ between two files. Lines starting with < come from the first file and lines starting with > from the second.

Look for differences in:

  • Input files, such as the surface dataset (fsurdat), initial conditions (finidat), and parameter file (paramfile)

  • Model options, such as use_crop or use_fates

For each difference, ask: why would this compset need this setting?

diff ~/cases/i1850_sp.basics/CaseDocs/lnd_in ~/cases/i2000_fates.basics/CaseDocs/lnd_in

Test your understanding#

  • Where would you look to find out what other compsets are available?

  • What to the Rs and Gs mean in the FATES compset name?

  • What atmospheric meteorological forcing data is being used? Are there other options?

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