perturbation growth test for cam4 using ccsm4 scripts?

[jenny@misu_su_se]

Hi,

I try to perform the CAM4 perturbation growth test in a CCSM4 case, but I do not get a flat surface in my simulation (seen by looking at the PS field in the h0.nc file, which clearly shows the Rockies and Himalayans). Can I do the perturbation growth tests for CAM4 using the CCSM scripts or do I have to run CAM stand alone?

Most thankful for help!
Jenny


The case I work with was created using:

ccsm4/scripts/create_newcase -case $HOME/my.ccsm4/F.f19_g16.pergro -res f19_g16 -compset F -mach ekman

Next some modifications where made:

a. I added the -pergro option to the cam configure command in the file $CASEROOT/Tools/Templates/cam
.cpl7.template

b. I added the file $CASEROOT/SourceMods/src.cam/user_nl:

&camexp
stop_option='ndays'
stop_n=2
nhtfrq=1
ndens=1
mfilt=97
hfilename_spec='h%t.nc'
empty_htapes=.true.
fincl1='T:I','PS:I'
aqua_planet=.true.
/

 

[eaton]

You do need to use the CAM standalone scripts to do a CAM4 perturbation growth test. The main issue is that the docn ocean component used in the F compset does not support an aquaplanet mode. That is a special functionality of the CAM4 specific data ocean component which is only supported as part of standalone CAM.

 

[jenny@misu_su_se]

Thanks for this information!
Jenny