CAM5 turn off radiative effects of aerosols

[mark@atmos_colostate_edu]

I’m running the F_2000_CAM5_AQUAPLANET compset with -chem none, and I would like to turn off the radiative effect of aerosols.  In user_nl_cam I set:  rad_climate    = 'A:Q:H2O', 'N:O2:O2', 'N:CO2:CO2',         'N:ozone:O3', 'N:N2O:N2O', 'N:CH4:CH4',         'N:CFC11:CFC11', 'N:CFC12:CFC12' and this did get set in the resulting atm_in, which effectively removed the following lines that were present in the original atm_in:         'M:mam3_mode1:/glade/p/cesmdata/cseg/inputdata/atm/cam/physprops/mam3_mode1_rrtmg_c110318.nc',         'M:mam3_mode2:/glade/p/cesmdata/cseg/inputdata/atm/cam/physprops/mam3_mode2_rrtmg_c110318.nc',          'M:mam3_mode3:/glade/p/cesmdata/cseg/inputdata/atm/cam/physprops/mam3_mode3_rrtmg_c110318.nc' But when I run I get this error:rad_cnst_init: checking for radiative constituents(shr_sys_abort) ERROR: init_modes ERROR: cannot find physics buffer field num_a1 Judging from the documentation I’m guessing that I also need to modify some things in the namelist switch “mode_defs” but I’m not sure what.  Any advice? Thanks,Mark 

 

[eaton]

The problem is that if you set mode_defs=' ', you get past the
initialization in rad_cnst_init, but you'll get a failure in the
microphysics code which also uses the rad_constituent interfaces to get
information about the aerosols.  Probably the easiest way to do this
without making code modifications is to create a dataset containing all the
required aerosols (using bulk instead of modal would be easier) and set
the mixing ratios to zero or tiny numbers if zero causes a problem.

 

[mark@atmos_colostate_edu]

Thanks for your suggestion, Brian.  I will give it a try.