Moist baroclinic wave with Kessler microphysics
The simpler model configurations described in this page are in development and will be considered for integration into the standard CESM Simpler Models after consideration and discussion at upcoming Atmosphere Model Working Group meetings, and in consultation with Lorenzo Polvani (firstname.lastname@example.org) or Amy Clement (email@example.com).
Note, the following instructions are only valid for CESM2 and subsequent releases
The following describes a moist version of the dry baroclinic wave of Ullrich et al. (2014) with Kessler microphysics (Kessler, 1969) that was part of the Dynamical Core Model Intercomparison Project (DCMIP) 2016 test case suite.
Running the FKESSLER test case
After downloading the latest CESM code base, users may perform this test by following the procedures outlined below. See the CESM user's guide for more infomation on creating and running new cases.
Step 1: Create the FKESSLER test case
This can be done using the create_newcase script located in the directory $CESM/cime/scripts/ e.g., for the f09_f09_mg17 (~1 deg) resolution
./create_newcase -compset FKESSLER -res f09_f09_mg17 -case $CASEDIR --run-unsupported
where the case directory is $CASEDIR. -res f09_f09_mg17 sets the dynamical core to the finite-volume dynamical core at 1 degree horizontal resolution. Replace -res f09_f09_mg17 with -res f19_f19_mg17 for the 2 degree horizontal resolution finite-volume dynamical core or -res ne30_ne30_mg17 for the 1 degree horizontal resolution spectral-element dynamical core. Any supported dynamical core and supported resolution for that particular dynamical core in CESM can be used (see source code file components/cam/bld/config_files/horiz_grid.xml).
Step 2: Configure the FKESSLER test case
The FKESSLER compset ensures that most of what is necessary to perform the test case is set up automatically. The default length of the simulation is set to 5 days, so in order to perform a 12 day test case, the following command must be invoked
For short simulations generating relatively small output files it is sometimes convenient to turn off the automatic archiving functionality in the CESM scripts:
If you want to see what configuration options you are using use
Step 3: Set up and build the FKESSLER test case
From within $CASEDIR run
Step 4: Run the FKESSLER test case
Step 5: Validate the FKESSLER test case output
A number of fields can be used to check that the simulation has produced correct output. Two such fields are shown below.
Figure 1: Large-scale precipitation rate at day 10 using the 1 degree finite-volume dynamical core.
Figure 2: Surface pressure at day 10 using the 1 degree finite-volume dynamical core.
These plots can be reproduced using an ncl script that can be downloaded here.