diff --git a/bld/namelist_files/use_cases/ssp585BB_cam6.xml b/bld/namelist_files/use_cases/ssp585BB_cam6.xml
new file mode 100644
index 0000000000..7843c5014e
--- /dev/null
+++ b/bld/namelist_files/use_cases/ssp585BB_cam6.xml
@@ -0,0 +1,94 @@
+<?xml version="1.0"?>
+
+<namelist_defaults>
+
+<ext_frc_specifier>             
+         'H2O ->  $INPUTDATA_ROOT/atm/cam/chem/emis/elev/H2OemissionCH4oxidationx2_3D_L70_2014-2101_CMIP6-SSP5-8.5_c190307.nc',
+         'num_a1 -> $INPUTDATA_ROOT/atm/cam/chem/emis/emissions_ssp585/emissions-cmip6-ScenarioMIP_IAMC-REMIND-MAGPIE-ssp585-1-1_num_so4_a1_anthro-ene_vertical_mol_175001-210101_0.9x1.25_c20190224.nc',
+         'num_a1 -> $INPUTDATA_ROOT/atm/cam/chem/emis/CMIP6_emissions_1750_2015/emissions-cmip6_num_a1_so4_contvolcano_vertical_850-5000_0.9x1.25_c20170724.nc',
+         'num_a2 -> $INPUTDATA_ROOT/atm/cam/chem/emis/CMIP6_emissions_1750_2015/emissions-cmip6_num_a2_so4_contvolcano_vertical_850-5000_0.9x1.25_c20170724.nc',
+         'SO2    -> $INPUTDATA_ROOT/atm/cam/chem/emis/CMIP6_emissions_1750_2015/emissions-cmip6_SO2_contvolcano_vertical_850-5000_0.9x1.25_c20170724.nc',
+         'so4_a1 -> $INPUTDATA_ROOT/atm/cam/chem/emis/emissions_ssp585/emissions-cmip6-ScenarioMIP_IAMC-REMIND-MAGPIE-ssp585-1-1_so4_a1_anthro-ene_vertical_mol_175001-210101_0.9x1.25_c20190224.nc',
+         'so4_a1 -> $INPUTDATA_ROOT/atm/cam/chem/emis/CMIP6_emissions_1750_2015/emissions-cmip6_so4_a1_contvolcano_vertical_850-5000_0.9x1.25_c20170724.nc',
+         'so4_a2 -> $INPUTDATA_ROOT/atm/cam/chem/emis/CMIP6_emissions_1750_2015/emissions-cmip6_so4_a2_contvolcano_vertical_850-5000_0.9x1.25_c20170724.nc'
+</ext_frc_specifier>
+
+
+<srf_emis_specifier>
+         'bc_a4    -> $INPUTDATA_ROOT/atm/cam/chem/emis/emissions_ssp585/emissions-cmip6-ScenarioMIP_IAMC-REMIND-MAGPIE-ssp585-1-1_bc_a4_anthro_surface_mol_175001-210101_0.9x1.25_c20190224.nc',
+         'bc_a4    -> $INPUTDATA_ROOT/atm/cam/chem/emis/emissions_ssp585-BB_smoothed/emissions-cmip6-ScenarioMIP_IAMC-REMIND-MAGPIE-ssp585-1-1_smoothed_bc_a4_bb_surface_mol_175001-210101_0.9x1.25_c20190224-c230316.nc',
+         'DMS      -> $INPUTDATA_ROOT/atm/cam/chem/emis/emissions_ssp585-BB_smoothed/emissions-cmip6-ScenarioMIP_IAMC-REMIND-MAGPIE-ssp585-1-1_smoothed_DMS_bb_surface_mol_175001-210101_0.9x1.25_c20190224-c230316.nc',
+         'DMS      -> $INPUTDATA_ROOT/atm/cam/chem/emis/emissions_ssp585/emissions-cmip6-SSP_DMS_other_surface_mol_175001-210101_0.9x1.25_c20190224.nc',
+         'num_a1   -> $INPUTDATA_ROOT/atm/cam/chem/emis/emissions_ssp585-BB_smoothed/emissions-cmip6-ScenarioMIP_IAMC-REMIND-MAGPIE-ssp585-1-1_smoothed_num_so4_a1_bb_surface_mol_175001-210101_0.9x1.25_c20190224-c230316.nc',
+         'num_a1   -> $INPUTDATA_ROOT/atm/cam/chem/emis/emissions_ssp585/emissions-cmip6-ScenarioMIP_IAMC-REMIND-MAGPIE-ssp585-1-1_num_so4_a1_anthro-ag-ship_surface_mol_175001-210101_0.9x1.25_c20190224.nc',
+         'num_a2   -> $INPUTDATA_ROOT/atm/cam/chem/emis/emissions_ssp585/emissions-cmip6-ScenarioMIP_IAMC-REMIND-MAGPIE-ssp585-1-1_num_so4_a2_anthro-res_surface_mol_175001-210101_0.9x1.25_c20190224.nc',
+         'num_a4   -> $INPUTDATA_ROOT/atm/cam/chem/emis/emissions_ssp585-BB_smoothed/emissions-cmip6-ScenarioMIP_IAMC-REMIND-MAGPIE-ssp585-1-1_smoothed_num_bc_a4_bb_surface_mol_175001-210101_0.9x1.25_c20190224-c230316.nc',
+         'num_a4   -> $INPUTDATA_ROOT/atm/cam/chem/emis/emissions_ssp585/emissions-cmip6-ScenarioMIP_IAMC-REMIND-MAGPIE-ssp585-1-1_num_bc_a4_anthro_surface_mol_175001-210101_0.9x1.25_c20190224.nc',
+         'num_a4   -> $INPUTDATA_ROOT/atm/cam/chem/emis/emissions_ssp585/emissions-cmip6-ScenarioMIP_IAMC-REMIND-MAGPIE-ssp585-1-1_num_pom_a4_anthro_surface_mol_175001-210101_0.9x1.25_c20190224.nc',
+         'num_a4   -> $INPUTDATA_ROOT/atm/cam/chem/emis/emissions_ssp585-BB_smoothed/emissions-cmip6-ScenarioMIP_IAMC-REMIND-MAGPIE-ssp585-1-1_smoothed_num_pom_a4_bb_surface_mol_175001-210101_0.9x1.25_c20190224-c230316.nc',
+         'pom_a4   -> $INPUTDATA_ROOT/atm/cam/chem/emis/emissions_ssp585/emissions-cmip6-ScenarioMIP_IAMC-REMIND-MAGPIE-ssp585-1-1_pom_a4_anthro_surface_mol_175001-210101_0.9x1.25_c20190224.nc',
+         'pom_a4   -> $INPUTDATA_ROOT/atm/cam/chem/emis/emissions_ssp585/emissions-cmip6-ScenarioMIP_IAMC-REMIND-MAGPIE-ssp585-1-1_pom_a4_bb_surface_mol_175001-210101_0.9x1.25_c20190224.nc',
+         'pom_a4   -> $INPUTDATA_ROOT/atm/cam/chem/emis/emissions_ssp585-BB_smoothed/emissions-cmip6-ScenarioMIP_IAMC-REMIND-MAGPIE-ssp585-1-1_smoothed_pom_a4_bb_surface_mol_175001-210101_0.9x1.25_c20190224-c230316.nc',
+         'SO2      -> $INPUTDATA_ROOT/atm/cam/chem/emis/emissions_ssp585/emissions-cmip6-ScenarioMIP_IAMC-REMIND-MAGPIE-ssp585-1-1_SO2_anthro-ag-ship-res_surface_mol_175001-210101_0.9x1.25_c20190224.nc',
+         'SO2      -> $INPUTDATA_ROOT/atm/cam/chem/emis/emissions_ssp585/emissions-cmip6-ScenarioMIP_IAMC-REMIND-MAGPIE-ssp585-1-1_SO2_anthro-ene_surface_mol_175001-210101_0.9x1.25_c20190224.nc',
+         'SO2      -> $INPUTDATA_ROOT/atm/cam/chem/emis/emissions_ssp585-BB_smoothed/emissions-cmip6-ScenarioMIP_IAMC-REMIND-MAGPIE-ssp585-1-1_smoothed_SO2_bb_surface_mol_175001-210101_0.9x1.25_c20190224-c230316.nc',
+         'so4_a1   -> $INPUTDATA_ROOT/atm/cam/chem/emis/emissions_ssp585/emissions-cmip6-ScenarioMIP_IAMC-REMIND-MAGPIE-ssp585-1-1_so4_a1_anthro-ag-ship_surface_mol_175001-210101_0.9x1.25_c20190224.nc',
+         'so4_a1   -> $INPUTDATA_ROOT/atm/cam/chem/emis/emissions_ssp585-BB_smoothed/emissions-cmip6-ScenarioMIP_IAMC-REMIND-MAGPIE-ssp585-1-1_smoothed_so4_a1_bb_surface_mol_175001-210101_0.9x1.25_c20190224-c230316.nc',
+         'so4_a2   -> $INPUTDATA_ROOT/atm/cam/chem/emis/emissions_ssp585/emissions-cmip6-ScenarioMIP_IAMC-REMIND-MAGPIE-ssp585-1-1_so4_a2_anthro-res_surface_mol_175001-210101_0.9x1.25_c20190224.nc',
+         'SOAG ->   $INPUTDATA_ROOT/atm/cam/chem/emis/emissions_ssp585/emissions-cmip6-ScenarioMIP_IAMC-REMIND-MAGPIE-ssp585-1-1_SOAGx1.5_anthro_surface_mol_175001-210101_0.9x1.25_c20200403.nc',
+         'SOAG ->  $INPUTDATA_ROOT/atm/cam/chem/emis/emissions_ssp585-BB_smoothed/emissions-cmip6-ScenarioMIP_IAMC-REMIND-MAGPIE-ssp585-1-1_smoothed_SOAGx1.5_bb_surface_mol_175001-210101_0.9x1.25_c20200403-c230316.nc',
+         'SOAG ->  $INPUTDATA_ROOT/atm/cam/chem/emis/emissions_ssp585/emissions-cmip6-ScenarioMIP_IAMC-REMIND-MAGPIE-ssp585-1-1_SOAGx1.5_biogenic_surface_mol_175001-210101_0.9x1.25_c20190226.nc'
+</srf_emis_specifier>
+
+
+<!-- Solar data from NRL -->
+  <solar_irrad_data_file>atm/cam/solar/SolarForcingCMIP6_18491230-23000102_c20200615.nc</solar_irrad_data_file>
+
+
+  <tracer_cnst_datapath     >   'atm/cam/tracer_cnst'                                        </tracer_cnst_datapath>
+  <tracer_cnst_file         >   'tracer_cnst_halons_3D_L70_2014-2101_CMIP6-SSP5-8.5_c190307.nc' </tracer_cnst_file>
+  <tracer_cnst_specifier    >   'O3','OH','NO3','HO2'                                        </tracer_cnst_specifier>
+  <tracer_cnst_type         >   'INTERP_MISSING_MONTHS'                                      </tracer_cnst_type>
+  <tracer_cnst_filelist     >   ''                                                           </tracer_cnst_filelist>
+
+
+  <prescribed_ozone_datapath>   'atm/cam/ozone_strataero'                                                    </prescribed_ozone_datapath>
+  <prescribed_ozone_file    >   'ozone_strataero_WACCM_L70_zm5day_2015-2100_SSP585_c190529.nc' </prescribed_ozone_file>
+  <prescribed_ozone_name    >   'O3'                                                                         </prescribed_ozone_name>
+  <prescribed_ozone_type    >   'SERIAL'                                                                     </prescribed_ozone_type>
+
+
+  <srf_emis_type          >    INTERP_MISSING_MONTHS  </srf_emis_type>
+  <ext_frc_type             >    INTERP_MISSING_MONTHS  </ext_frc_type>
+
+
+  <prescribed_strataero_type    >     'SERIAL'                                                                     </prescribed_strataero_type>
+  <prescribed_strataero_datapath>     'atm/cam/ozone_strataero'                                                    </prescribed_strataero_datapath>
+  <prescribed_strataero_file>      'ozone_strataero_WACCM_L70_zm5day_2015-2100_SSP585_c190529.nc'  </prescribed_strataero_file>
+  <prescribed_strataero_use_chemtrop> .true.                                                                       </prescribed_strataero_use_chemtrop>
+
+
+<co2_readflux_fuel>.true.</co2_readflux_fuel>
+<co2flux_fuel_file hgrid="0.9x1.25">atm/cam/ggas/emissions-cmip6_CO2_anthro_surface_ScenarioMIP_IAMC-REMIND-MAGPIE-ssp585_201401-210112_fv_0.9x1.25_c20190207.nc</co2flux_fuel_file>
+<co2flux_fuel_file hgrid="1.9x2.5">atm/cam/ggas/emissions-cmip6_CO2_anthro_surface_ScenarioMIP_IAMC-REMIND-MAGPIE-ssp585_201401-210112_fv_1.9x2.5_c20190207.nc</co2flux_fuel_file>
+
+
+<co2_readflux_aircraft>.true.</co2_readflux_aircraft>
+<aircraft_type>SERIAL</aircraft_type>
+<aircraft_datapath>atm/cam/ggas</aircraft_datapath>
+<aircraft_specifier hgrid="0.9x1.25">ac_CO2 -> emissions-cmip6_CO2_anthro_ac_MAGPIE-ssp585_201401-210112_fv_0.9x1.25_c20190207.txt</aircraft_specifier>
+<aircraft_co2_file hgrid="0.9x1.25">atm/cam/ggas/emissions-cmip6_CO2_anthro_ac_ScenarioMIP_IAMC-REMIND-MAGPIE-ssp585_201401-210112_fv_0.9x1.25_c20190207.nc</aircraft_co2_file>
+<aircraft_specifier hgrid="1.9x2.5">ac_CO2 -> emissions-cmip6_CO2_anthro_ac_MAGPIE-ssp585_201401-210112_fv_1.9x2.5_c20190207.txt</aircraft_specifier>
+<aircraft_co2_file hgrid="1.9x2.5">emissions-cmip6_CO2_anthro_ac_ScenarioMIP_IAMC-REMIND-MAGPIE-ssp585_201401-210112_fv_1.9x2.5_c20190207.nc</aircraft_co2_file>
+
+  <scenario_ghg            >    'CHEM_LBC_FILE'   </scenario_ghg>
+  <flbc_file>atm/waccm/lb/LBC_2014-2500_CMIP6_SSP585_0p5degLat_GlobAnnAvg_c190301.nc</flbc_file>
+  <flbc_type>'SERIAL'</flbc_type>
+  <flbc_list>'CO2','CH4','N2O','CFC11eq','CFC12'</flbc_list>
+
+
+  <!-- sim_year used for CLM datasets and SSTs forcings -->
+  <sim_year>1850-2100</sim_year>
+
+
+</namelist_defaults>
diff --git a/cime_config/config_component.xml b/cime_config/config_component.xml
index a7b68af8ce..d03180459a 100644
--- a/cime_config/config_component.xml
+++ b/cime_config/config_component.xml
@@ -247,6 +247,7 @@
       <value compset="SSP370_CAM60%SMBB%SMYLE" >ssp370BB_smyle_cam6</value>
       <value compset="SSP370EXT_CAM60%SMBB" >ssp370BBext_cam6</value>
       <value compset="SSP245_CAM60%SMBB" >ssp245BB_cam6</value>
+      <value compset="SSP585_CAM60%SMBB" >ssp585BB_cam6</value>
       <value compset="SSP126_CAM60%WCTS" >waccm_tsmlt_ssp126_cam6</value>
       <value compset="SSP245_CAM60%WCTS" >waccm_tsmlt_ssp245_cam6</value>
       <value compset="SSP370_CAM60%WCTS" >waccm_tsmlt_ssp370_cam6</value>
diff --git a/doc/ChangeLog b/doc/ChangeLog
index ee680df1f1..228bab6585 100644
--- a/doc/ChangeLog
+++ b/doc/ChangeLog
@@ -1,5 +1,54 @@
 ===============================================================
 
+Tag name: cam_cesm2_1_rel_r58
+Originator(s): fischer
+Date: 30 May 2023 
+One-line Summary: Add use case for BSSP585smbb
+Github PR URL: https://github.com/ESCOMP/CAM/pull/822
+
+Purpose of changes (include the issue number and title text for each relevant GitHub issue):
+Addresses Issue #821 (Add use_case for BSSP585smbb.)
+
+Describe any changes made to build system:
+
+Describe any changes made to the namelist:
+Add ssp585BB_cam6 use case.
+
+List any changes to the defaults for the boundary datasets:
+
+Describe any substantial timing or memory changes:
+
+Code reviewed by: cacraig
+
+List all files eliminated:
+
+List all files added and what they do:
+- bld/namelist_files/use_cases/ssp585BB_cam6.xml
+  Namelist variable settings needed for BSSP585smbb compset.
+
+List all existing files that have been modified, and describe the changes:
+- cime_config/config_component.xml
+  Add reference to ssp585BB_cam6 use case.
+
+If there were any failures reported from running test_driver.sh on any test
+platform, and checkin with these failures has been OK'd by the gatekeeper,
+then copy the lines from the td.*.status files for the failed tests to the
+appropriate machine below.  All failed tests must be justified.
+
+cheyenne/intel:
+Ran ERS.f09_g17.BSSP585smbb.cheyenne_intel.allactive-defaultio, and all passed.
+
+cheyenne/intel/aux_cam:
+
+izumi/nag:
+
+izumi/pgi:
+
+Summarize any changes to answers: No answer changes
+
+===============================================================
+===============================================================
+
 Tag name: cam_cesm2_1_rel_57
 Originator(s): fvitt
 Date: 5 Jan 2023