Possible to run WACCM without its chemical part?

K

kangwanying1992@gmail_com

Member
I have tried both CESM1.0.5 and CESM1.2.0 to turn off the time-consuming chemical module, but failed.In fact what I want is a configuration with WACCM's gravity wave parameterization and vertical resolution but not its chemistry.  Have anyone done this before? The model reported that waccm physics can only run with waccm chemistry. Grateful if you have any suggestion!
 
S

santos

Member
Removing the chemistry entirely is not possible (and would not give reasonable results), but you can use Specified Chemistry WACCM (SC-WACCM), which runs significantly faster than WACCM with full interactive chemistry. SC-WACCM uses prescribed forcing datasets that were created from a normal WACCM run, so for many purposes it will provide similar results to a full WACCM run.To use SC-WACCM, just create a case using one of the specified chemistry compsets, and configure it as you would a typical WACCM run. CESM 1.0.5 and CESM 1.2.0 both have bugs in the default SC-WACCM settings, and have very few compsets. Therefore I recommend switching to CESM 1.0.6 or CESM 1.2.2, because these offer many more SC-WACCM compsets, and they also have those known bugs fixed.If you use CESM 1.0.6, note that one of the specified chemistry compsets, FWSC, has the bug mentioned here:https://bb.cgd.ucar.edu/cesm106-fwsc-does-not-run-default-namelist
 
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