Prescribing aerosols in CESM1.0.4(CAM5)

[amatcaos@caos_iisc_ernet_in]

Hey,I am using E1850C5CN compset. Here, how can I prescribe aerosols, say 'sulf:SO4' and 'bcar1:CB1'.Earlier I was using CAM4 wherein I was adding the following lines in the cam.buildnml.csh and it was working:...&aerodep_flx_nl
 aerodep_flx_cycle_yr           = 1850
 aerodep_flx_datapath           = '$DIN_LOC_ROOT/atm/cam/chem/trop_mozart_aero/aero'
 aerodep_flx_file               = 'aerosoldep_monthly_1850_mean_1.9x2.5_c090421.nc'
 aerodep_flx_specifier          = 'BCDEPWET', 'BCPHODRY', 'BCPHIDRY', 'OCDEPWET', 'OCPHODRY', 'OCPHIDRY', 'DSTX01DD', 'DSTX02DD',
  'DSTX03DD', 'DSTX04DD', 'DSTX01WD', 'DSTX02WD', 'DSTX03WD', 'DSTX04WD'
 aerodep_flx_type               = 'CYCLICAL'&prescribed_aero_nl
 prescribed_aero_cycle_yr               = 1850
 prescribed_aero_datapath               = '$DIN_LOC_ROOT/atm/cam/chem/trop_mozart_aero/aero'
 prescribed_aero_file           = 'aero_1.9x2.5_L26_1850clim_c091112.nc'
 prescribed_aero_specifier              = 'sulf:SO4', 'bcar1:CB1', 'bcar2:CB2', 'ocar1:OC1', 'ocar2:OC2', 'sslt1:SSLT01', 'sslt2:SSLT02',
  'sslt3:SSLT03', 'sslt4:SSLT04', 'dust1:DST01', 'dust2:DST02', 'dust3:DST03', 'dust4:DST04'
 prescribed_aero_type           = 'CYCLICAL'...Basically, this use to come in default after build-namelist. however, it is not now coming for this compset. So, in order to prescribe aerosols here, can I add same these two groups in my E1850C5CN compset's cam.buildnml.csh?Another important difference I notice between CAM4 and CAM5 is the radiation_scheme. (CAM4 - 'camrt' and CAM5 - 'rrtmg').
Many ThanksAngshuman

 

[hannay]

Aoresol scheme and radiation scheme are different between CAM4 and CAM5 (as well as many other parametraizations).                                    CAM4       CAM5
Aerosol scheme:    BAM         MAM
Radiation scheme: CAMRT     RRTMGCESM1.0.4(CAM5) doesn't have the capabilty to run with prescribed MAM aerosols. This capability exists in cesm1_2_0 for some configurations (for both 1850 and present day compsets but not for transient compsets).In CAM1.0.4, you have the option to run CAM5 with prescribed BAM. (which is not the default radiation scheme for CAM5) using teh flag: "-chem none"
See also the related threads:
https://bb.cgd.ucar.edu/node/1002386
https://bb.cgd.ucar.edu/running-cam5-prescribed-bam

 

[amatcaos@caos_iisc_ernet_in]

Hi
Thanks for the info. the suggested threads helped me. Another query: is it possible to change the default aerosol particle size in BAM and run the model i.e if I use CAM4.
Thanks Angshuman