About rad_diag_1

[yangyangiap@gmail_com]

Hi
I'd like to use rad_diag_1 to diagnose aerosol with CAM5.
First, I added P_so4_a1:/home/xx/inputdata/atm/cam/physprops/sulfate_rrtmg_c080918.ncto namelist_defaults_cam.xml, but it didn't work. The output don't have anything with "_d1".
Then, I tried to set rad_diag_1='P_so4_a1:/home/xx/inputdata/atm/cam/physprops/sulfate_rrtmg_c080918.nc' to CAM_NAMELIST_OPTS in env_conf.xml. It didn't work too.
Then, I added rad_diag_1='P_so4_a1:/home/xx/inputdata/atm/cam/physprops/sulfate_rrtmg_c080918.nc' to cam.buildnml.csh. It also didn't work.

Please help me.
Thank you.

 

[eaton]

The radiation diagnostic calculations are not fully functional in the CESM1_0_2 release. The only diagnostic calculation that is implemented is to remove *all* the aerosols, which permits a calculation of the total aerosol forcing. To do this you would set rad_diag_1 to contain just the values of the gas species. All the rad_diag_* variables use the same syntax as the rad_climate variable, so that setting should look like this:

rad_diag_1 = 'P_Q:H2O', 'D_O2:O2', 'D_CO2:CO2', 'D_ozone:O3', 'D_N2O:N2O', 'D_CH4:CH4', 'D_CFC11:CFC11',
'D_CFC12:CFC12'

This could be added to cam.buildnml.csh to the rad_cnst_nl namelist group.

A future release will contain a fully functional diagnostic calculation, but it probably won't be available until the Fall.

 

[yangyangiap@gmail_com]

Thank you very much.
But if I calculate the total aerosol forcing, it has feedbacks of the climate caused by aerosols. How can I remove these feedbacks.

 

[eaton]

I should have said the current functionality allows diagnostic calculation of the total aerosol *direct* forcing. There is no way to remove the indirect effects, that is, the effect of the aerosols on the cloud microphysics.