4: Turn on the ecosystem

You can also explore setting up a similar case but using the G1850ECO component set. Note how this differs from the previous G component set we used in Exercise 1.

Figure: G1850ECO compset definition.

Exercise: Run a control case

Create a case called g_eco1850 using the compset G1850ECO at T62_g37 resolution.

Set the run length to 1 year.

Build and run the model. Since this is a control case, we want to build it “out of the box” without any modifications.

Click here for hints

How do I compile and run?

You can compile with the command:

qcmd -- ./case.build

You can run with the command:

./case.submit

How do I check the lenght of the run?

Use xmlquery to search for the variables that control the run length

Click here for the solution

Create a new case G1850ECO with the command:

cd /glade/u/home/$USER/code/my_cesm_code/cime/scripts/
./create_newcase --case /glade/u/home/$USER/cases/G1850ECO  --compset G1850ECO --res T62_g37

Case setup:

cd /glade/u/home/$USER/cases/G1850ECO 
./case.setup

Change the run length:

./xmlchange STOP_N=1,STOP_OPTION=nyears

If needed, change job queue and account number. For instance:

./xmlchange JOB_QUEUE=tutorial,PROJECT=UESM0013 --force

Build and submit:

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

When the run is completed, look into the archive directory for: G1850ECO.

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

cd /glade/derecho/scratch/$USER/archive/G1850ECO/ocn/hist
ls