ext_frc_specifier =  'H2O -> /glade/p/cesmdata/cseg/inputdata/atm/cam/chem/emis/elev/H2O_emission_CH4_oxidationx2_elev_1850-2100_CCMI_RCP6_0_c160219.nc',
         'SO2 -> /glade/p/cesm/cseg/inputdata/atm/cam/chem/emis/CMIP6_emissions_1750_2015/emissions-cmip6_SO2_contvolcano_vertical_1750-2100_0.9x1.25_c20170322.nc',
         'SO2 -> /glade/p/cesm/cseg/inputdata/atm/cam/chem/emis/CMIP6_emissions_1750_2015/emissions-cmip6_SO2_aircraft_vertical_1750-2015_0.9x1.25_c20170322.nc',
         'bc_a4 -> /glade/p/cesm/cseg/inputdata/atm/cam/chem/emis/CMIP6_emissions_1750_2015/emissions-cmip6_bc_a4_aircraft_vertical_1750-2015_0.9x1.25_c20170322.nc',
         'bc_a4 -> /glade/p/cesm/cseg/inputdata/atm/cam/chem/emis/CMIP6_emissions_1750_2015/emissions-cmip6_bc_a4_bb_ar5vertical_1750-2015_0.9x1.25_c20170505.nc',
         'pom_a4 -> /glade/p/cesm/cseg/inputdata/atm/cam/chem/emis/CMIP6_emissions_1750_2015/emissions-cmip6_pom_a4_bb_ar5vertical_1750-2015_0.9x1.25_c20170505.nc',
         'so4_a1 -> /glade/p/cesm/cseg/inputdata/atm/cam/chem/emis/CMIP6_emissions_1750_2015/emissions-cmip6_so4_a1_anthro_vertical_1750-2015_0.9x1.25_c20170322.nc',
         'so4_a1 -> /glade/p/cesm/cseg/inputdata/atm/cam/chem/emis/CMIP6_emissions_1750_2015/emissions-cmip6_so4_a1_bb_ar5vertical_1750-2015_0.9x1.25_c20170505.nc',
         'so4_a1 -> /glade/p/cesm/cseg/inputdata/atm/cam/chem/emis/CMIP6_emissions_1750_2015/emissions-cmip6_so4_a1_contvolcano_vertical_1750-2100_0.9x1.25_c20170322.nc',
         'so4_a2 -> /glade/p/cesm/cseg/inputdata/atm/cam/chem/emis/CMIP6_emissions_1750_2015/emissions-cmip6_so4_a2_contvolcano_vertical_1750-2100_0.9x1.25_c20170322.nc',
         'num_a1 -> /glade/p/cesm/cseg/inputdata/atm/cam/chem/emis/CMIP6_emissions_1750_2015/emissions-cmip6_num_so4_a1_anthro_vertical_1750-2015_0.9x1.25_c20170322.nc',
         'num_a1 -> /glade/p/cesm/cseg/inputdata/atm/cam/chem/emis/CMIP6_emissions_1750_2015/emissions-cmip6_num_so4_a1_bb_ar5vertical_1750-2015_0.9x1.25_c20170505.nc',
         'num_a1 -> /glade/p/cesm/cseg/inputdata/atm/cam/chem/emis/CMIP6_emissions_1750_2015/emissions-cmip6_num_so4_a1_contvolcano_vertical_1750-2100_0.9x1.25_c20170322.nc',
         'num_a2 -> /glade/p/cesm/cseg/inputdata/atm/cam/chem/emis/CMIP6_emissions_1750_2015/emissions-cmip6_num_so4_a2_contvolcano_vertical_1750-2100_0.9x1.25_c20170322.nc',
         'num_a4 -> /glade/p/cesm/cseg/inputdata/atm/cam/chem/emis/CMIP6_emissions_1750_2015/emissions-cmip6_num_bc_a4_aircraft_vertical_1750-2015_0.9x1.25_c20170322.nc',
         'num_a4 -> /glade/p/cesm/cseg/inputdata/atm/cam/chem/emis/CMIP6_emissions_1750_2015/emissions-cmip6_num_bc_a4_bb_ar5vertical_1750-2015_0.9x1.25_c20170505.nc',
         'num_a4 -> /glade/p/cesm/chwg_dev/emmons/CMIP6_emissions_1750_2015_v20170322/emissions-cmip6_num_pom_a4_bb_ar5vertical_1750-2015_0.9x1.25_c20170509.nc'

srf_emis_specifier = 'DMS -> /glade/p/cesm/cseg/inputdata/atm/cam/chem/emis/CMIP6_emissions_1750_2015/emissions-cmip6_DMS_other_surface_1750-2015_0.9x1.25_c20170322.nc',
         'DMS -> /glade/p/cesm/cseg/inputdata/atm/cam/chem/emis/CMIP6_emissions_1750_2015/emissions-cmip6_DMS_bb_surface_1750-2015_0.9x1.25_c20170322.nc'
         'SO2 -> /glade/p/cesm/cseg/inputdata/atm/cam/chem/emis/CMIP6_emissions_1750_2015/emissions-cmip6_SO2_anthro-all_surface_1750-2015_0.9x1.25_c20170426.nc',
         'SO2 -> /glade/p/cesm/cseg/inputdata/atm/cam/chem/emis/CMIP6_emissions_1750_2015/emissions-cmip6_SO2_bb_surface_1750-2015_0.9x1.25_c20170322.nc',
         'so4_a1 -> /glade/p/cesm/cseg/inputdata/atm/cam/chem/emis/CMIP6_emissions_1750_2015/emissions-cmip6_so4_a1_anthro_surface_1750-2015_0.9x1.25_c20170322.nc',
         'so4_a2 -> /glade/p/cesm/cseg/inputdata/atm/cam/chem/emis/CMIP6_emissions_1750_2015/emissions-cmip6_so4_a2_anthro_surface_1750-2015_0.9x1.25_c20170322.nc',
         'num_a1 -> /glade/p/cesm/cseg/inputdata/atm/cam/chem/emis/CMIP6_emissions_1750_2015/emissions-cmip6_num_so4_a1_anthro_surface_1750-2015_0.9x1.25_c20170322.nc',
         'num_a1 -> /glade/p/cesm/cseg/inputdata/atm/cam/chem/emis/CMIP6_emissions_1750_2015/emissions-cmip6_num_so4_a1_ship_surface_1750-2015_0.9x1.25_c20170322.nc',
         'num_a2 -> /glade/p/cesm/cseg/inputdata/atm/cam/chem/emis/CMIP6_emissions_1750_2015/emissions-cmip6_num_so4_a2_anthro_surface_1750-2015_0.9x1.25_c20170322.nc',
         'bc_a4 -> /glade/p/cesm/cseg/inputdata/atm/cam/chem/emis/CMIP6_emissions_1750_2015/emissions-cmip6_bc_a4_anthro_surface_1750-2015_0.9x1.25_c20170322.nc',
         'num_a4 -> /glade/p/cesm/cseg/inputdata/atm/cam/chem/emis/CMIP6_emissions_1750_2015/emissions-cmip6_num_bc_a4_anthro_surface_1750-2015_0.9x1.25_c20170322.nc',
         'pom_a4 -> /glade/p/cesm/cseg/inputdata/atm/cam/chem/emis/CMIP6_emissions_1750_2015/emissions-cmip6_pom_a4_anthro_surface_1750-2015_0.9x1.25_c20170322.nc',
         'num_a4 -> /glade/p/cesm/chwg_dev/emmons/CMIP6_emissions_1750_2015_v20170322/emissions-cmip6_num_pom_a4_bb_surface_1750-2015_0.9x1.25_c20170509.nc',
         'SOAG -> /glade/p/cesm/cseg/inputdata/atm/cam/chem/emis/CMIP6_emissions_1750_2015/emissions-cmip6_SOAGx1.5_anthro_surface_1750-2015_0.9x1.25_c20170322.nc',
         'SOAG -> /glade/p/cesm/cseg/inputdata/atm/cam/chem/emis/CMIP6_emissions_1750_2015/emissions-cmip6_SOAGx1.5_biogenic_surface_1750-2015_0.9x1.25_c20170322.nc',
         'SOAG -> /glade/p/cesm/cseg/inputdata/atm/cam/chem/emis/CMIP6_emissions_1750_2015/emissions-cmip6_SOAGx1.5_bb_surface_1750-2015_0.9x1.25_c20170322.nc'
