aerosol radiative forcing run

[liurj04@gmail_com]

Hi,I want to estimate direct effect of aerosols, so I want ro run two simulations:1) one simulation with the present day (2000) emissions of aerosols and precursor;2) one simulation with the pre-industrial (1850) emissions of aerosols and precursor.all other forcing kept in present day (2000).I do not  know how to run a case with the pre-industrial (1850) emissions and other forcing kept in present day (2000).  please help!  thank you~

 

[hannay]

To run a case with the pre-industrial (1850) emissions and other forcing kept to present day (2000):1. use the FC5 compset to create a new_case (the FC5 compset will set all the forcing/boundary conditions to present values)2. invoke cesm_setup3. edit the user_nl_cam to replace the 2000 values by the 1850 values.It means that you add the following lines to your user_nl_cam: ext_frc_specifier              = 'SO2         -> /glade/p/cesmdata/cseg/inputdata/atm/cam/chem/trop_mozart_aero/emis/ar5_mam3_so2_elev_1850_c090726.nc',
         'bc_a1       -> /glade/p/cesmdata/cseg/inputdata/atm/cam/chem/trop_mozart_aero/emis/ar5_mam3_bc_elev_1850_c090726.nc',
         'num_a1      -> /glade/p/cesmdata/cseg/inputdata/atm/cam/chem/trop_mozart_aero/emis/ar5_mam3_num_a1_elev_1850_c090726.nc',
         'num_a2      -> /glade/p/cesmdata/cseg/inputdata/atm/cam/chem/trop_mozart_aero/emis/ar5_mam3_num_a2_elev_1850_c090726.nc',
         'pom_a1      -> /glade/p/cesmdata/cseg/inputdata/atm/cam/chem/trop_mozart_aero/emis/ar5_mam3_oc_elev_1850_c090726.nc',
         'so4_a1      -> /glade/p/cesmdata/cseg/inputdata/atm/cam/chem/trop_mozart_aero/emis/ar5_mam3_so4_a1_elev_1850_c090726.nc',
         'so4_a2      -> /glade/p/cesmdata/cseg/inputdata/atm/cam/chem/trop_mozart_aero/emis/ar5_mam3_so4_a2_elev_1850_c090726.nc'
 ext_frc_type           = 'CYCLICAL'
 srf_emis_specifier             = 'DMS       -> /glade/p/cesmdata/cseg/inputdata/atm/cam/chem/trop_mozart_aero/emis/aerocom_mam3_dms_surf_2000_c090129.nc',
         'SO2       -> /glade/p/cesmdata/cseg/inputdata/atm/cam/chem/trop_mozart_aero/emis/ar5_mam3_so2_surf_1850_c090726.nc',
         'SOAG      -> /glade/p/cesmdata/cseg/inputdata/atm/cam/chem/trop_mozart_aero/emis/ar5_mam3_soag_1.5_surf_1850_c100217.nc',
         'bc_a1     -> /glade/p/cesmdata/cseg/inputdata/atm/cam/chem/trop_mozart_aero/emis/ar5_mam3_bc_surf_1850_c090726.nc',
         'num_a1    -> /glade/p/cesmdata/cseg/inputdata/atm/cam/chem/trop_mozart_aero/emis/ar5_mam3_num_a1_surf_1850_c090726.nc',
         'num_a2    -> /glade/p/cesmdata/cseg/inputdata/atm/cam/chem/trop_mozart_aero/emis/ar5_mam3_num_a2_surf_1850_c090726.nc',
         'pom_a1    -> /glade/p/cesmdata/cseg/inputdata/atm/cam/chem/trop_mozart_aero/emis/ar5_mam3_oc_surf_1850_c090726.nc',
         'so4_a1    -> /glade/p/cesmdata/cseg/inputdata/atm/cam/chem/trop_mozart_aero/emis/ar5_mam3_so4_a1_surf_1850_c090726.nc',
         'so4_a2    -> /glade/p/cesmdata/cseg/inputdata/atm/cam/chem/trop_mozart_aero/emis/ar5_mam3_so4_a2_surf_1850_c090726.nc'
 srf_emis_type          = 'CYCLICAL'

 

 

[liurj04@gmail_com]

I got it !Thank you very much~