diff --git a/cime_config/allactive/config_compsets.xml b/cime_config/allactive/config_compsets.xml
index 21032c483714..e66f1e473d85 100755
--- a/cime_config/allactive/config_compsets.xml
+++ b/cime_config/allactive/config_compsets.xml
@@ -86,23 +86,65 @@
   <lname>20TRSOI_EAM%CMIP6_ELM%CNPRDCTCBCTOP_MPASSI_MPASO_MOSART_SGLC_SWAV</lname>
 </compset>
 
+<!-- Compsets for historical single forcing experiments, two aliases each with WCYCL20TR or hist as prefix -->
+
+<compset>
+  <alias>WCYCL20TR-GHG</alias>
+  <lname>20TRSOI_EAM%CMIP6-GHG_ELM%CNPRDCTCBCTOP_MPASSI_MPASO_MOSART_SGLC_SWAV</lname>
+</compset>
+
+<compset>
+  <alias>WCYCL20TR-aer</alias>
+  <lname>20TRSOI_EAM%CMIP6-AER_ELM%CNPRDCTCBCTOP_MPASSI_MPASO_MOSART_SGLC_SWAV</lname>
+</compset>
+
+<compset>
+  <alias>WCYCL20TR-xGHG-xaer</alias>
+  <lname>20TRSOI_EAM%CMIP6-xGHG-xAER_ELM%CNPRDCTCBCTOP_MPASSI_MPASO_MOSART_SGLC_SWAV</lname>
+</compset>
+
+<compset>
+  <alias>WCYCL20TR-nat</alias>
+  <lname>20TRSOI_EAM%CMIP6-NAT_ELM%CNPRDCTCBCTOP_MPASSI_MPASO_MOSART_SGLC_SWAV</lname>
+</compset>
+
+<compset>
+  <alias>WCYCL20TR-ozone</alias>
+  <lname>20TRSOI_EAM%CMIP6-OZONE_ELM%CNPRDCTCBCTOP_MPASSI_MPASO_MOSART_SGLC_SWAV</lname>
+</compset>
+
+<compset>
+  <alias>WCYCL20TR-lulc</alias>
+  <lname>20TRSOI_EAM%CMIP6-LULC_ELM%CNPRDCTCBCTOP_MPASSI_MPASO_MOSART_SGLC_SWAV</lname>
+</compset>
+
+<compset>
+  <alias>WCYCL20TR-volc</alias>
+  <lname>20TRSOI_EAM%CMIP6-VOLC_ELM%CNPRDCTCBCTOP_MPASSI_MPASO_MOSART_SGLC_SWAV</lname>
+</compset>
+
+<compset>
+  <alias>WCYCL20TR-xaer</alias>
+  <lname>20TRSOI_EAM%CMIP6-xAER_ELM%CNPRDCTCBCTOP_MPASSI_MPASO_MOSART_SGLC_SWAV</lname>
+</compset>
+
 <!-- ************************************************ -->
 <!--               MMF coupled compsets               -->
 <!-- ************************************************ -->
 <compset>
   <alias>WCYCL1950-MMF1</alias>
-  <lname>1950SOI_EAM%CMIP6-MMF1_ELM%SPBC_MPASSI_MPASO_MOSART_SGLC_SWAV</lname>
+  <lname>1950SOI_EAM%MMF1_ELM%SPBC_MPASSI_MPASO_MOSART_SGLC_SWAV</lname>
 </compset>
 
 <compset>
   <alias>WCYCL20TR-MMF1</alias>
-  <lname>20TRSOI_EAM%CMIP6-MMF1_ELM%SP_MPASSI_MPASO_MOSART_SGLC_SWAV</lname>
+  <lname>20TRSOI_EAM%MMF1_ELM%SP_MPASSI_MPASO_MOSART_SGLC_SWAV</lname>
 </compset>
 
 <!-- separate compset for testing (NS = no spinup) -->
 <compset>
   <alias>WCYCL20TRNS-MMF1</alias>
-  <lname>20TR_EAM%CMIP6-MMF1_ELM%SP_MPASSI_MPASO_MOSART_SGLC_SWAV</lname>
+  <lname>20TR_EAM%MMF1_ELM%SP_MPASSI_MPASO_MOSART_SGLC_SWAV</lname>
 </compset>
 <!-- ************************************************** -->
 <!-- ************************************************** -->
diff --git a/components/eam/bld/namelist_files/use_cases/20TR_eam_CMIP6-GHG_chemUCI-Linoz-mam5-vbs.xml b/components/eam/bld/namelist_files/use_cases/20TR_eam_CMIP6-GHG_chemUCI-Linoz-mam5-vbs.xml
new file mode 100644
index 000000000000..cd16d6a0d9a6
--- /dev/null
+++ b/components/eam/bld/namelist_files/use_cases/20TR_eam_CMIP6-GHG_chemUCI-Linoz-mam5-vbs.xml
@@ -0,0 +1,121 @@
+<?xml version="1.0"?>
+<namelist_defaults>
+
+<!-- Set default output options for CMIP6 simulations -->
+<cosp_lite>.true.</cosp_lite>
+
+<!-- For comprehensive history -->
+<history_amwg>.true.</history_amwg>
+<history_aerosol>.true.</history_aerosol>
+<history_aero_optics>.true.</history_aero_optics>
+
+<!-- Solar constant from CMIP6 input4MIPS -->
+<solar_data_file>atm/cam/solar/Solar_1850control_input4MIPS_c20181106.nc</solar_data_file>
+<solar_data_ymd>18500101</solar_data_ymd>
+<solar_data_type>FIXED</solar_data_type>
+
+<!-- GHG values from CMIP6 input4MIPS -->
+<bndtvghg>atm/cam/ggas/GHG_CMIP-1-2-0_Annual_Global_0000-2014_c20180105.nc</bndtvghg>
+<scenario_ghg>RAMPED</scenario_ghg>
+
+<!-- External forcing for BAM or MAM.  CMIP6 input4mips data -->
+<ext_frc_type         >CYCLICAL</ext_frc_type>
+<ext_frc_cycle_yr     >1850</ext_frc_cycle_yr>
+<no2_ext_file         >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_NO2_aircraft_vertical_1750-2015_1.9x2.5_c20170608.nc </no2_ext_file>
+<!--  Use 1850-2014 averaged volcanic SO2 emission for 1850 -->
+<so2_ext_file         >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_1850_2014_avg_so2_elev_strat_1850.nc </so2_ext_file>
+<soag0_ext_file       >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/emissions-cmip6_e3sm_SOAG0_elev_1850-2014_1.9x2.5_c20230201.nc </soag0_ext_file>
+<bc_a4_ext_file       >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_bc_a4_elev_1850-2014_c180205.nc </bc_a4_ext_file>
+<mam7_num_a1_ext_file >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_num_a1_elev_1850-2014_c180205.nc </mam7_num_a1_ext_file>
+<num_a2_ext_file      >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_num_a2_elev_1850-2014_c180205.nc </num_a2_ext_file>
+<mam7_num_a3_ext_file >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_num_a4_elev_1850-2014_c180205.nc </mam7_num_a3_ext_file> <!-- This is to set num_a4 emissions -->
+<pom_a4_ext_file      >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_pom_a4_elev_1850-2014_c180205.nc </pom_a4_ext_file>
+<so4_a1_ext_file      >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_so4_a1_elev_1850-2014_c180205.nc </so4_a1_ext_file>
+<so4_a2_ext_file      >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_so4_a2_elev_1850-2014_c180205.nc </so4_a2_ext_file>
+
+<!-- Surface emissions for chemUCI-Linoz, MAM5, VBS SOA.  CMIP6 input4mips data -->
+<srf_emis_type        >CYCLICAL</srf_emis_type>
+<srf_emis_cycle_yr    >1850</srf_emis_cycle_yr>
+<c2h4_emis_file       >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_C2H4_surface_1850-2014_1.9x2.5_c20210323.nc </c2h4_emis_file>
+<c2h6_emis_file       >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_C2H6_surface_1850-2014_1.9x2.5_c20210323.nc </c2h6_emis_file>
+<c3h8_emis_file       >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_C3H8_surface_1850-2014_1.9x2.5_c20210323.nc </c3h8_emis_file>
+<ch2o_emis_file       >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_CH2O_surface_1850-2014_1.9x2.5_c20210323.nc </ch2o_emis_file>
+<ch3cho_emis_file     >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_CH3CHO_surface_1850-2014_1.9x2.5_c20210323.nc </ch3cho_emis_file>
+<ch3coch3_emis_file   >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_CH3COCH3_surface_1850-2014_1.9x2.5_c20210323.nc </ch3coch3_emis_file>
+<co_emis_file         >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_CO_surface_1850-2014_1.9x2.5_c20210323.nc </co_emis_file>
+<isop_emis_file       >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_ISOP_surface_1850-2014_1.9x2.5_c20210323.nc </isop_emis_file>
+<isop_vbs_emis_file   >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_ISOP_surface_1850-2014_1.9x2.5_c20210323.nc </isop_vbs_emis_file>
+<c10h16_emis_file     >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_MTERP_surface_1850-2014_1.9x2.5_c20230126.nc </c10h16_emis_file>
+<nox_emis_file        >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_NO_surface_1850-2014_1.9x2.5_c20220425.nc </nox_emis_file>
+<dms_emis_file        >atm/cam/chem/trop_mozart_aero/emis/DMSflux.1850.1deg_latlon_conserv.POPmonthlyClimFromACES4BGC_c20160416.nc </dms_emis_file>
+<soag0_emis_file     >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/emissions-cmip6_e3sm_SOAG0_surf_1850-2014_1.9x2.5_c20230201.nc </soag0_emis_file>
+<so2_emis_file        >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_so2_surf_1850-2014_c180205.nc </so2_emis_file>
+<bc_a4_emis_file      >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_bc_a4_surf_1850-2014_c180205.nc </bc_a4_emis_file>
+<mam7_num_a1_emis_file>atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_num_a1_surf_1850-2014_c180205.nc </mam7_num_a1_emis_file>
+<num_a2_emis_file     >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_num_a2_surf_1850-2014_c180205.nc </num_a2_emis_file>
+<mam7_num_a3_emis_file>atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_num_a4_surf_1850-2014_c180205.nc </mam7_num_a3_emis_file> <!-- This is to set num_a4 emissions -->
+<pom_a4_emis_file     >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_pom_a4_surf_1850-2014_c180205.nc </pom_a4_emis_file>
+<so4_a1_emis_file     >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_so4_a1_surf_1850-2014_c180205.nc </so4_a1_emis_file>
+<so4_a2_emis_file     >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_so4_a2_surf_1850-2014_c180205.nc </so4_a2_emis_file>
+<e90_emis_file        >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions_E90_surface_1750-2015_1.9x2.5_c20210408.nc </e90_emis_file>
+
+<airpl_emis_file></airpl_emis_file>   <!-- need to be empty, but if specifying empty here, the value would be root of input_data_path -->
+
+<!-- Prescribed oxidants for aerosol chemistry.   Ozone is from CMIP6 input4MIPS file -->
+<tracer_cnst_type    >CYCLICAL</tracer_cnst_type>
+<tracer_cnst_cycle_yr>1849</tracer_cnst_cycle_yr>
+<tracer_cnst_file    >oxid_1.9x2.5_L26_1850-2015_c20181106.nc</tracer_cnst_file>
+<tracer_cnst_filelist>''</tracer_cnst_filelist>
+<tracer_cnst_datapath>atm/cam/chem/trop_mozart_aero/oxid</tracer_cnst_datapath>
+<tracer_cnst_specifier>'prsd_O3:O3','prsd_NO3:NO3','prsd_OH:OH'</tracer_cnst_specifier>
+
+<!-- prescribed methane  -->
+<prescribed_ghg_file      >ch4_oxid_1.9x2.5_L26_1990-1999clim.c090804.nc</prescribed_ghg_file>
+<prescribed_ghg_datapath  >atm/cam/chem/methane</prescribed_ghg_datapath>
+<prescribed_ghg_type      >CYCLICAL</prescribed_ghg_type>
+<prescribed_ghg_cycle_yr  >1995</prescribed_ghg_cycle_yr>
+<prescribed_ghg_filelist  >''</prescribed_ghg_filelist>
+<prescribed_ghg_specifier>'prsd_ch4:CH4'</prescribed_ghg_specifier>
+
+<!-- rad_climate -->
+<rad_climate>
+  'A:H2OLNZ:H2O', 'N:O2:O2', 'N:CO2:CO2',
+  'A:O3:O3', 'A:N2OLNZ:N2O', 'A:CH4LNZ:CH4',
+  'N:CFC11:CFC11', 'N:CFC12:CFC12',
+  'M:mam5_mode1:$INPUTDATA_ROOT/atm/cam/physprops/mam4_mode1_rrtmg_aeronetdust_c141106.nc',
+  'M:mam5_mode2:$INPUTDATA_ROOT/atm/cam/physprops/mam4_mode2_rrtmg_c130628.nc',
+  'M:mam5_mode3:$INPUTDATA_ROOT/atm/cam/physprops/mam4_mode3_rrtmg_aeronetdust_c141106.nc',
+  'M:mam5_mode4:$INPUTDATA_ROOT/atm/cam/physprops/mam4_mode4_rrtmg_c130628.nc',
+  'M:mam5_mode5:$INPUTDATA_ROOT/atm/cam/physprops/mam5_mode5_rrtmg_sig1.2_dgnl.40_c03072023.nc'
+</rad_climate>
+
+<!-- Marine organic aerosol namelist settings -->
+<mam_mom_mixing_state>3</mam_mom_mixing_state>
+<mam_mom_cycle_yr  >1                                                                                    </mam_mom_cycle_yr  >
+<mam_mom_datapath  >'atm/cam/chem/trop_mam/marine_BGC/'                                                  </mam_mom_datapath  >
+<mam_mom_datatype  >'CYCLICAL'										 </mam_mom_datatype  >
+<mam_mom_filename  >'monthly_macromolecules_0.1deg_bilinear_latlon_year01_merge_date.nc'                 </mam_mom_filename  > <!-- Using the 2000 file, for now -->
+<mam_mom_fixed_tod >0											 </mam_mom_fixed_tod >
+<mam_mom_fixed_ymd >0											 </mam_mom_fixed_ymd >
+<mam_mom_specifier >'chla:CHL1','mpoly:TRUEPOLYC','mprot:TRUEPROTC','mlip:TRUELIPC'			 </mam_mom_specifier >
+
+<!-- Stratospheric ozone (Linoz) updated using CMIP6 input4MIPS GHG concentrations -->
+<chlorine_loading_file      >atm/cam/chem/trop_mozart/ub/Linoz_Chlorine_Loading_CMIP6_0003-2017_c20171114.nc</chlorine_loading_file>
+<chlorine_loading_fixed_ymd >18500101</chlorine_loading_fixed_ymd>
+<chlorine_loading_type      >FIXED</chlorine_loading_type>
+<linoz_data_cycle_yr        >1850</linoz_data_cycle_yr>
+<linoz_data_file            >linv3_1849-2017_CMIP6_Hist_10deg_58km_c20230705.nc</linoz_data_file>
+<linoz_data_path            >atm/cam/chem/trop_mozart/ub</linoz_data_path>
+<linoz_data_type            >CYCLICAL</linoz_data_type>
+
+<!-- Set surface area density (SAD) variables -->
+<sad_type>SERIAL</sad_type>
+
+<!-- Turn off ozone dry deposition, as Linoz O3v2 and ozone are not separated for now. Need to turn on ozone dry deposition when interactive tropospheric chemistry is implemented -->
+<drydep_method       >'xactive_lnd'</drydep_method>
+<drydep_list         >'O3','H2O2','CH2O','CH3OOH','NO','NO2','HNO3','HO2NO2','PAN','CO','CH3COCH3','C2H5OOH','CH3CHO','H2SO4','SO2','NO3','N2O5','SOAG0','SOAG15','SOAG24','SOAG35','SOAG34','SOAG33','SOAG32','SOAG31'</drydep_list>
+<gas_wetdep_method   >'NEU'</gas_wetdep_method>
+<gas_wetdep_list     >'C2H5OOH','CH2O','CH3CHO','CH3OOH','H2O2','H2SO4','HNO3','HO2NO2','SO2','SOAG0','SOAG15','SOAG24','SOAG35','SOAG34','SOAG33','SOAG32','SOAG31'</gas_wetdep_list>
+<fstrat_efold_list>'CH2O', 'CH3O2', 'CH3OOH', 'PAN', 'CO', 'C2H6', 'C3H8', 'C2H4', 'ROHO2', 'CH3COCH3', 'C2H5O2', 'C2H5OOH', 'CH3CHO', 'CH3CO3', 'ISOP', 'ISOPO2', 'MVKMACR', 'MVKO2'</fstrat_efold_list>
+<fstrat_list         >''</fstrat_list>
+</namelist_defaults>
diff --git a/components/eam/bld/namelist_files/use_cases/20TR_eam_CMIP6-LULC_chemUCI-Linoz-mam5-vbs.xml b/components/eam/bld/namelist_files/use_cases/20TR_eam_CMIP6-LULC_chemUCI-Linoz-mam5-vbs.xml
new file mode 100644
index 000000000000..e2f53df4dc60
--- /dev/null
+++ b/components/eam/bld/namelist_files/use_cases/20TR_eam_CMIP6-LULC_chemUCI-Linoz-mam5-vbs.xml
@@ -0,0 +1,124 @@
+<?xml version="1.0"?>
+<namelist_defaults>
+
+<!-- Set default output options for CMIP6 simulations -->
+<cosp_lite>.true.</cosp_lite>
+
+<!-- For comprehensive history -->
+<history_amwg>.true.</history_amwg>
+<history_aerosol>.true.</history_aerosol>
+<history_aero_optics>.true.</history_aero_optics>
+
+<!-- Solar constant from CMIP6 input4MIPS -->
+<solar_data_file>atm/cam/solar/Solar_1850control_input4MIPS_c20181106.nc</solar_data_file>
+<solar_data_ymd>18500101</solar_data_ymd>
+<solar_data_type>FIXED</solar_data_type>
+
+<!-- 1850 GHG values from CMIP6 input4MIPS -->
+<!-- <co2vmr>284.317e-6</co2vmr> The CMIP6 concentration set by CCSM_CO2_PPMV in cime/src/drivers/mct/cime_config/config_component_acme.xml -->
+<ch4vmr>808.249e-9</ch4vmr>
+<n2ovmr>273.0211e-9</n2ovmr>
+<f11vmr>32.1102e-12</f11vmr>
+<f12vmr>0.0</f12vmr>
+
+<!-- External forcing for BAM or MAM.  CMIP6 input4mips data -->
+<ext_frc_type         >CYCLICAL</ext_frc_type>
+<ext_frc_cycle_yr     >1850</ext_frc_cycle_yr>
+<no2_ext_file         >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_NO2_aircraft_vertical_1750-2015_1.9x2.5_c20170608.nc </no2_ext_file>
+<!--  Use 1850-2014 averaged volcanic SO2 emission for 1850 -->
+<so2_ext_file         >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_1850_2014_avg_so2_elev_strat_1850.nc </so2_ext_file>
+<soag0_ext_file       >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/emissions-cmip6_e3sm_SOAG0_elev_1850-2014_1.9x2.5_c20230201.nc </soag0_ext_file>
+<bc_a4_ext_file       >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_bc_a4_elev_1850-2014_c180205.nc </bc_a4_ext_file>
+<mam7_num_a1_ext_file >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_num_a1_elev_1850-2014_c180205.nc </mam7_num_a1_ext_file>
+<num_a2_ext_file      >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_num_a2_elev_1850-2014_c180205.nc </num_a2_ext_file>
+<mam7_num_a3_ext_file >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_num_a4_elev_1850-2014_c180205.nc </mam7_num_a3_ext_file> <!-- This is to set num_a4 emissions -->
+<pom_a4_ext_file      >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_pom_a4_elev_1850-2014_c180205.nc </pom_a4_ext_file>
+<so4_a1_ext_file      >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_so4_a1_elev_1850-2014_c180205.nc </so4_a1_ext_file>
+<so4_a2_ext_file      >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_so4_a2_elev_1850-2014_c180205.nc </so4_a2_ext_file>
+
+<!-- Surface emissions for chemUCI-Linoz, MAM5, VBS SOA.  CMIP6 input4mips data -->
+<srf_emis_type        >CYCLICAL</srf_emis_type>
+<srf_emis_cycle_yr    >1850</srf_emis_cycle_yr>
+<c2h4_emis_file       >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_C2H4_surface_1850-2014_1.9x2.5_c20210323.nc </c2h4_emis_file>
+<c2h6_emis_file       >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_C2H6_surface_1850-2014_1.9x2.5_c20210323.nc </c2h6_emis_file>
+<c3h8_emis_file       >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_C3H8_surface_1850-2014_1.9x2.5_c20210323.nc </c3h8_emis_file>
+<ch2o_emis_file       >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_CH2O_surface_1850-2014_1.9x2.5_c20210323.nc </ch2o_emis_file>
+<ch3cho_emis_file     >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_CH3CHO_surface_1850-2014_1.9x2.5_c20210323.nc </ch3cho_emis_file>
+<ch3coch3_emis_file   >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_CH3COCH3_surface_1850-2014_1.9x2.5_c20210323.nc </ch3coch3_emis_file>
+<co_emis_file         >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_CO_surface_1850-2014_1.9x2.5_c20210323.nc </co_emis_file>
+<isop_emis_file       >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_ISOP_surface_1850-2014_1.9x2.5_c20210323.nc </isop_emis_file>
+<isop_vbs_emis_file   >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_ISOP_surface_1850-2014_1.9x2.5_c20210323.nc </isop_vbs_emis_file>
+<c10h16_emis_file     >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_MTERP_surface_1850-2014_1.9x2.5_c20230126.nc </c10h16_emis_file>
+<nox_emis_file        >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_NO_surface_1850-2014_1.9x2.5_c20220425.nc </nox_emis_file>
+<dms_emis_file        >atm/cam/chem/trop_mozart_aero/emis/DMSflux.1850.1deg_latlon_conserv.POPmonthlyClimFromACES4BGC_c20160416.nc </dms_emis_file>
+<soag0_emis_file     >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/emissions-cmip6_e3sm_SOAG0_surf_1850-2014_1.9x2.5_c20230201.nc </soag0_emis_file>
+<so2_emis_file        >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_so2_surf_1850-2014_c180205.nc </so2_emis_file>
+<bc_a4_emis_file      >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_bc_a4_surf_1850-2014_c180205.nc </bc_a4_emis_file>
+<mam7_num_a1_emis_file>atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_num_a1_surf_1850-2014_c180205.nc </mam7_num_a1_emis_file>
+<num_a2_emis_file     >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_num_a2_surf_1850-2014_c180205.nc </num_a2_emis_file>
+<mam7_num_a3_emis_file>atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_num_a4_surf_1850-2014_c180205.nc </mam7_num_a3_emis_file> <!-- This is to set num_a4 emissions -->
+<pom_a4_emis_file     >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_pom_a4_surf_1850-2014_c180205.nc </pom_a4_emis_file>
+<so4_a1_emis_file     >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_so4_a1_surf_1850-2014_c180205.nc </so4_a1_emis_file>
+<so4_a2_emis_file     >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_so4_a2_surf_1850-2014_c180205.nc </so4_a2_emis_file>
+<e90_emis_file        >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions_E90_surface_1750-2015_1.9x2.5_c20210408.nc </e90_emis_file>
+
+<airpl_emis_file></airpl_emis_file>   <!-- need to be empty, but if specifying empty here, the value would be root of input_data_path -->
+
+<!-- Prescribed oxidants for aerosol chemistry.   Ozone is from CMIP6 input4MIPS file -->
+<tracer_cnst_type    >CYCLICAL</tracer_cnst_type>
+<tracer_cnst_cycle_yr>1849</tracer_cnst_cycle_yr>
+<tracer_cnst_file    >oxid_1.9x2.5_L26_1850-2015_c20181106.nc</tracer_cnst_file>
+<tracer_cnst_filelist>''</tracer_cnst_filelist>
+<tracer_cnst_datapath>atm/cam/chem/trop_mozart_aero/oxid</tracer_cnst_datapath>
+<tracer_cnst_specifier>'prsd_O3:O3','prsd_NO3:NO3','prsd_OH:OH'</tracer_cnst_specifier>
+
+<!-- prescribed methane  -->
+<prescribed_ghg_file      >ch4_oxid_1.9x2.5_L26_1990-1999clim.c090804.nc</prescribed_ghg_file>
+<prescribed_ghg_datapath  >atm/cam/chem/methane</prescribed_ghg_datapath>
+<prescribed_ghg_type      >CYCLICAL</prescribed_ghg_type>
+<prescribed_ghg_cycle_yr  >1995</prescribed_ghg_cycle_yr>
+<prescribed_ghg_filelist  >''</prescribed_ghg_filelist>
+<prescribed_ghg_specifier>'prsd_ch4:CH4'</prescribed_ghg_specifier>
+
+<!-- rad_climate -->
+<rad_climate>
+  'A:H2OLNZ:H2O', 'N:O2:O2', 'N:CO2:CO2',
+  'A:O3:O3', 'A:N2OLNZ:N2O', 'A:CH4LNZ:CH4',
+  'N:CFC11:CFC11', 'N:CFC12:CFC12',
+  'M:mam5_mode1:$INPUTDATA_ROOT/atm/cam/physprops/mam4_mode1_rrtmg_aeronetdust_c141106.nc',
+  'M:mam5_mode2:$INPUTDATA_ROOT/atm/cam/physprops/mam4_mode2_rrtmg_c130628.nc',
+  'M:mam5_mode3:$INPUTDATA_ROOT/atm/cam/physprops/mam4_mode3_rrtmg_aeronetdust_c141106.nc',
+  'M:mam5_mode4:$INPUTDATA_ROOT/atm/cam/physprops/mam4_mode4_rrtmg_c130628.nc',
+  'M:mam5_mode5:$INPUTDATA_ROOT/atm/cam/physprops/mam5_mode5_rrtmg_sig1.2_dgnl.40_c03072023.nc'
+</rad_climate>
+
+<!-- Marine organic aerosol namelist settings -->
+<mam_mom_mixing_state>3</mam_mom_mixing_state>
+<mam_mom_cycle_yr  >1                                                                                    </mam_mom_cycle_yr  >
+<mam_mom_datapath  >'atm/cam/chem/trop_mam/marine_BGC/'                                                  </mam_mom_datapath  >
+<mam_mom_datatype  >'CYCLICAL'										 </mam_mom_datatype  >
+<mam_mom_filename  >'monthly_macromolecules_0.1deg_bilinear_latlon_year01_merge_date.nc'                 </mam_mom_filename  > <!-- Using the 2000 file, for now -->
+<mam_mom_fixed_tod >0											 </mam_mom_fixed_tod >
+<mam_mom_fixed_ymd >0											 </mam_mom_fixed_ymd >
+<mam_mom_specifier >'chla:CHL1','mpoly:TRUEPOLYC','mprot:TRUEPROTC','mlip:TRUELIPC'			 </mam_mom_specifier >
+
+<!-- Stratospheric ozone (Linoz) updated using CMIP6 input4MIPS GHG concentrations -->
+<chlorine_loading_file      >atm/cam/chem/trop_mozart/ub/Linoz_Chlorine_Loading_CMIP6_0003-2017_c20171114.nc</chlorine_loading_file>
+<chlorine_loading_fixed_ymd >18500101</chlorine_loading_fixed_ymd>
+<chlorine_loading_type      >FIXED</chlorine_loading_type>
+<linoz_data_cycle_yr        >1850</linoz_data_cycle_yr>
+<linoz_data_file            >linv3_1849-2017_CMIP6_Hist_10deg_58km_c20230705.nc</linoz_data_file>
+<linoz_data_path            >atm/cam/chem/trop_mozart/ub</linoz_data_path>
+<linoz_data_type            >CYCLICAL</linoz_data_type>
+
+<!-- Set surface area density (SAD) variables -->
+<sad_type>SERIAL</sad_type>
+
+<!-- Turn off ozone dry deposition, as Linoz O3v2 and ozone are not separated for now. Need to turn on ozone dry deposition when interactive tropospheric chemistry is implemented -->
+<drydep_method       >'xactive_lnd'</drydep_method>
+<drydep_list         >'O3','H2O2','CH2O','CH3OOH','NO','NO2','HNO3','HO2NO2','PAN','CO','CH3COCH3','C2H5OOH','CH3CHO','H2SO4','SO2','NO3','N2O5','SOAG0','SOAG15','SOAG24','SOAG35','SOAG34','SOAG33','SOAG32','SOAG31'</drydep_list>
+<gas_wetdep_method   >'NEU'</gas_wetdep_method>
+<gas_wetdep_list     >'C2H5OOH','CH2O','CH3CHO','CH3OOH','H2O2','H2SO4','HNO3','HO2NO2','SO2','SOAG0','SOAG15','SOAG24','SOAG35','SOAG34','SOAG33','SOAG32','SOAG31'</gas_wetdep_list>
+<fstrat_efold_list>'CH2O', 'CH3O2', 'CH3OOH', 'PAN', 'CO', 'C2H6', 'C3H8', 'C2H4', 'ROHO2', 'CH3COCH3', 'C2H5O2', 'C2H5OOH', 'CH3CHO', 'CH3CO3', 'ISOP', 'ISOPO2', 'MVKMACR', 'MVKO2'</fstrat_efold_list>
+<fstrat_list         >''</fstrat_list>
+</namelist_defaults>
diff --git a/components/eam/bld/namelist_files/use_cases/20TR_eam_CMIP6-aer_chemUCI-Linoz-mam5-vbs.xml b/components/eam/bld/namelist_files/use_cases/20TR_eam_CMIP6-aer_chemUCI-Linoz-mam5-vbs.xml
new file mode 100644
index 000000000000..8aedc762728b
--- /dev/null
+++ b/components/eam/bld/namelist_files/use_cases/20TR_eam_CMIP6-aer_chemUCI-Linoz-mam5-vbs.xml
@@ -0,0 +1,119 @@
+<?xml version="1.0"?>
+<namelist_defaults>
+
+<!-- Set default output options for CMIP6 simulations -->
+<cosp_lite>.true.</cosp_lite>
+
+<!-- For comprehensive history -->
+<history_amwg>.true.</history_amwg>
+<history_aerosol>.true.</history_aerosol>
+<history_aero_optics>.true.</history_aero_optics>
+
+<!-- Solar constant from CMIP6 input4MIPS -->
+<solar_data_file>atm/cam/solar/Solar_1850control_input4MIPS_c20181106.nc</solar_data_file>
+<solar_data_ymd>18500101</solar_data_ymd>
+<solar_data_type>FIXED</solar_data_type>
+
+<!-- GHG values from CMIP6 input4MIPS -->
+<!-- <co2vmr>284.317e-6</co2vmr> The CMIP6 concentration set by CCSM_CO2_PPMV in cime/src/drivers/mct/cime_config/config_component_acme.xml -->
+<ch4vmr>808.249e-9</ch4vmr>
+<n2ovmr>273.0211e-9</n2ovmr>
+<f11vmr>32.1102e-12</f11vmr>
+<f12vmr>0.0</f12vmr>
+
+<!-- External forcing for BAM or MAM.  CMIP6 input4mips data. SO2 file contains 1850 (background) volcanic but historical for other sectors -->
+<ext_frc_type>INTERP_MISSING_MONTHS</ext_frc_type>
+<no2_ext_file         >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_NO2_aircraft_vertical_1750-2015_1.9x2.5_c20170608.nc </no2_ext_file>
+<so2_ext_file         >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_so2_elev_1850-2014_c180205_hist-aero_1850-volcano.nc </so2_ext_file>
+<soag0_ext_file	      >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/emissions-cmip6_e3sm_SOAG0_elev_1850-2014_1.9x2.5_c20230201.nc </soag0_ext_file>
+<bc_a4_ext_file       >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_bc_a4_elev_1850-2014_c180205.nc </bc_a4_ext_file>
+<mam7_num_a1_ext_file >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_num_a1_elev_1850-2014_c180205.nc </mam7_num_a1_ext_file>
+<num_a2_ext_file      >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_num_a2_elev_1850-2014_c180205.nc </num_a2_ext_file>
+<mam7_num_a3_ext_file >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_num_a4_elev_1850-2014_c180205.nc </mam7_num_a3_ext_file> <!-- This is to set num_a4 emissions -->
+<pom_a4_ext_file      >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_pom_a4_elev_1850-2014_c180205.nc </pom_a4_ext_file>
+<so4_a1_ext_file      >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_so4_a1_elev_1850-2014_c180205.nc </so4_a1_ext_file>
+<so4_a2_ext_file      >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_so4_a2_elev_1850-2014_c180205.nc </so4_a2_ext_file>
+
+<!-- Surface emissions for chemUCI-Linoz, MAM5, VBS SOA.  CMIP6 input4mips data -->
+<srf_emis_type>INTERP_MISSING_MONTHS</srf_emis_type>
+<c2h4_emis_file       >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_C2H4_surface_1850-2014_1.9x2.5_c20210323.nc </c2h4_emis_file>
+<c2h6_emis_file       >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_C2H6_surface_1850-2014_1.9x2.5_c20210323.nc </c2h6_emis_file>
+<c3h8_emis_file       >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_C3H8_surface_1850-2014_1.9x2.5_c20210323.nc </c3h8_emis_file>
+<ch2o_emis_file       >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_CH2O_surface_1850-2014_1.9x2.5_c20210323.nc </ch2o_emis_file>
+<ch3cho_emis_file     >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_CH3CHO_surface_1850-2014_1.9x2.5_c20210323.nc </ch3cho_emis_file>
+<ch3coch3_emis_file   >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_CH3COCH3_surface_1850-2014_1.9x2.5_c20210323.nc </ch3coch3_emis_file>
+<co_emis_file         >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_CO_surface_1850-2014_1.9x2.5_c20210323.nc </co_emis_file>
+<isop_emis_file       >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_ISOP_surface_1850-2014_1.9x2.5_c20210323.nc </isop_emis_file>
+<isop_vbs_emis_file   >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_ISOP_surface_1850-2014_1.9x2.5_c20210323.nc </isop_vbs_emis_file>
+<c10h16_emis_file     >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_MTERP_surface_1850-2014_1.9x2.5_c20230126.nc </c10h16_emis_file>
+<nox_emis_file        >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_NO_surface_1850-2014_1.9x2.5_c20220425.nc </nox_emis_file>
+<dms_emis_file	      >atm/cam/chem/trop_mozart_aero/emis/DMSflux.1850-2100.1deg_latlon_conserv.POPmonthlyClimFromACES4BGC_c20160727.nc</dms_emis_file>
+<soag0_emis_file      >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/emissions-cmip6_e3sm_SOAG0_surf_1850-2014_1.9x2.5_c20230201.nc </soag0_emis_file>
+<so2_emis_file	      >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_so2_surf_1850-2014_c180205.nc </so2_emis_file>
+<bc_a4_emis_file      >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_bc_a4_surf_1850-2014_c180205.nc </bc_a4_emis_file>
+<mam7_num_a1_emis_file>atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_num_a1_surf_1850-2014_c180205.nc </mam7_num_a1_emis_file> 
+<num_a2_emis_file     >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_num_a2_surf_1850-2014_c180205.nc </num_a2_emis_file>
+<mam7_num_a3_emis_file>atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_num_a4_surf_1850-2014_c180205.nc </mam7_num_a3_emis_file> <!-- This is to set num_a4 emissions -->
+<pom_a4_emis_file     >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_pom_a4_surf_1850-2014_c180205.nc </pom_a4_emis_file>
+<so4_a1_emis_file     >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_so4_a1_surf_1850-2014_c180205.nc </so4_a1_emis_file>
+<so4_a2_emis_file     >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_so4_a2_surf_1850-2014_c180205.nc </so4_a2_emis_file>
+<e90_emis_file        >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions_E90_surface_1750-2015_1.9x2.5_c20210408.nc </e90_emis_file>
+
+<airpl_emis_file></airpl_emis_file>   <!-- need to be empty, but if specifying empty here, the value would be root of input_data_path -->
+
+<!-- Prescribed oxidants for aerosol chemistry.   Ozone is from CMIP6 input4MIPS file -->
+<tracer_cnst_type    >INTERP_MISSING_MONTHS</tracer_cnst_type>
+<tracer_cnst_file    >oxid_1.9x2.5_L26_1850-2015_c20181106.nc</tracer_cnst_file>
+<tracer_cnst_filelist>''</tracer_cnst_filelist>
+<tracer_cnst_datapath>atm/cam/chem/trop_mozart_aero/oxid</tracer_cnst_datapath>
+<tracer_cnst_specifier>'prsd_O3:O3','prsd_NO3:NO3','prsd_OH:OH'</tracer_cnst_specifier>
+
+<!-- prescribed methane  -->
+<prescribed_ghg_file      >ch4_oxid_1.9x2.5_L26_1990-1999clim.c090804.nc</prescribed_ghg_file>
+<prescribed_ghg_datapath  >atm/cam/chem/methane</prescribed_ghg_datapath>
+<prescribed_ghg_type      >CYCLICAL</prescribed_ghg_type>
+<prescribed_ghg_cycle_yr  >1995</prescribed_ghg_cycle_yr>
+<prescribed_ghg_filelist  >''</prescribed_ghg_filelist>
+<prescribed_ghg_specifier>'prsd_ch4:CH4'</prescribed_ghg_specifier>
+
+<!-- rad_climate -->
+<rad_climate>
+  'A:H2OLNZ:H2O', 'N:O2:O2', 'N:CO2:CO2',
+  'A:O3:O3', 'A:N2OLNZ:N2O', 'A:CH4LNZ:CH4',
+  'N:CFC11:CFC11', 'N:CFC12:CFC12',
+  'M:mam5_mode1:$INPUTDATA_ROOT/atm/cam/physprops/mam4_mode1_rrtmg_aeronetdust_c141106.nc',
+  'M:mam5_mode2:$INPUTDATA_ROOT/atm/cam/physprops/mam4_mode2_rrtmg_c130628.nc',
+  'M:mam5_mode3:$INPUTDATA_ROOT/atm/cam/physprops/mam4_mode3_rrtmg_aeronetdust_c141106.nc',
+  'M:mam5_mode4:$INPUTDATA_ROOT/atm/cam/physprops/mam4_mode4_rrtmg_c130628.nc',
+  'M:mam5_mode5:$INPUTDATA_ROOT/atm/cam/physprops/mam5_mode5_rrtmg_sig1.2_dgnl.40_c03072023.nc'
+</rad_climate>
+
+<!-- Marine organic aerosol namelist settings -->
+<mam_mom_mixing_state>3</mam_mom_mixing_state>
+<mam_mom_cycle_yr  >1                                                                                    </mam_mom_cycle_yr  >
+<mam_mom_datapath  >'atm/cam/chem/trop_mam/marine_BGC/'                                                  </mam_mom_datapath  >
+<mam_mom_datatype  >'CYCLICAL'										 </mam_mom_datatype  >
+<mam_mom_filename  >'monthly_macromolecules_0.1deg_bilinear_latlon_year01_merge_date.nc'                 </mam_mom_filename  > <!-- Using the 2000 file, for now -->
+<mam_mom_fixed_tod >0											 </mam_mom_fixed_tod >
+<mam_mom_fixed_ymd >0											 </mam_mom_fixed_ymd >
+<mam_mom_specifier >'chla:CHL1','mpoly:TRUEPOLYC','mprot:TRUEPROTC','mlip:TRUELIPC'			 </mam_mom_specifier >
+
+<chlorine_loading_file      >atm/cam/chem/trop_mozart/ub/Linoz_Chlorine_Loading_CMIP6_0003-2017_c20171114.nc</chlorine_loading_file>
+<chlorine_loading_fixed_ymd >18500101</chlorine_loading_fixed_ymd>
+<chlorine_loading_type      >FIXED</chlorine_loading_type>
+<linoz_data_cycle_yr        >1850</linoz_data_cycle_yr>
+<linoz_data_file            >linv3_1849-2017_CMIP6_Hist_10deg_58km_c20230705.nc</linoz_data_file>
+<linoz_data_path            >atm/cam/chem/trop_mozart/ub</linoz_data_path>
+<linoz_data_type            >CYCLICAL</linoz_data_type>
+
+<!-- Set surface area density (SAD) variables -->
+<sad_type>SERIAL</sad_type>
+
+<!-- Turn off ozone dry deposition, as Linoz O3v2 and ozone are not separated for now. Need to turn on ozone dry deposition when interactive tropospheric chemistry is implemented -->
+<drydep_method       >'xactive_lnd'</drydep_method>
+<drydep_list         >'O3','H2O2','CH2O','CH3OOH','NO','NO2','HNO3','HO2NO2','PAN','CO','CH3COCH3','C2H5OOH','CH3CHO','H2SO4','SO2','NO3','N2O5','SOAG0','SOAG15','SOAG24','SOAG35','SOAG34','SOAG33','SOAG32','SOAG31'</drydep_list>
+<gas_wetdep_method   >'NEU'</gas_wetdep_method>
+<gas_wetdep_list     >'C2H5OOH','CH2O','CH3CHO','CH3OOH','H2O2','H2SO4','HNO3','HO2NO2','SO2','SOAG0','SOAG15','SOAG24','SOAG35','SOAG34','SOAG33','SOAG32','SOAG31'</gas_wetdep_list>
+<fstrat_efold_list>'CH2O', 'CH3O2', 'CH3OOH', 'PAN', 'CO', 'C2H6', 'C3H8', 'C2H4', 'ROHO2', 'CH3COCH3', 'C2H5O2', 'C2H5OOH', 'CH3CHO', 'CH3CO3', 'ISOP', 'ISOPO2', 'MVKMACR', 'MVKO2'</fstrat_efold_list>
+<fstrat_list         >''</fstrat_list>
+</namelist_defaults>
diff --git a/components/eam/bld/namelist_files/use_cases/20TR_eam_CMIP6-nat_chemUCI-Linoz-mam5-vbs.xml b/components/eam/bld/namelist_files/use_cases/20TR_eam_CMIP6-nat_chemUCI-Linoz-mam5-vbs.xml
new file mode 100644
index 000000000000..493affd96414
--- /dev/null
+++ b/components/eam/bld/namelist_files/use_cases/20TR_eam_CMIP6-nat_chemUCI-Linoz-mam5-vbs.xml
@@ -0,0 +1,123 @@
+<?xml version="1.0"?>
+<namelist_defaults>
+
+<!-- Set default output options for CMIP6 simulations -->
+<cosp_lite>.true.</cosp_lite>
+
+<!-- For comprehensive history -->
+<history_amwg>.true.</history_amwg>
+<history_aerosol>.true.</history_aerosol>
+<history_aero_optics>.true.</history_aero_optics>
+
+<!-- Solar constant from CMIP6 input4MIPS -->
+<solar_data_file>atm/cam/solar/Solar_1850-2299_input4MIPS_c20181106.nc</solar_data_file>
+<solar_data_type>SERIAL</solar_data_type>
+
+<!-- GHG values from CMIP6 input4MIPS -->
+<!-- <co2vmr>284.317e-6</co2vmr> The CMIP6 concentration set by CCSM_CO2_PPMV in cime/src/drivers/mct/cime_config/config_component_acme.xml -->
+<ch4vmr>808.249e-9</ch4vmr>
+<n2ovmr>273.0211e-9</n2ovmr>
+<f11vmr>32.1102e-12</f11vmr>
+<f12vmr>0.0</f12vmr>
+
+<!-- External forcing for BAM or MAM.  CMIP6 input4mips data. SO2 file contains historical volcanic but 1850 for other sectors -->
+<!-- Need to use INTERP_MISSING_MONTHS for ext_frc_volc_type to go with ths updated SO2 file -->
+<ext_frc_volc_type    >INTERP_MISSING_MONTHS</ext_frc_volc_type>
+<ext_frc_type         >CYCLICAL</ext_frc_type>
+<ext_frc_cycle_yr     >1850</ext_frc_cycle_yr>
+<no2_ext_file         >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_NO2_aircraft_vertical_1750-2015_1.9x2.5_c20170608.nc </no2_ext_file>
+<so2_ext_file         >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_so2_elev_1850-2014_c180205_1850-aero_hist-volcano.nc </so2_ext_file>
+<soag0_ext_file	      >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/emissions-cmip6_e3sm_SOAG0_elev_1850-2014_1.9x2.5_c20230201.nc </soag0_ext_file>
+<bc_a4_ext_file       >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_bc_a4_elev_1850-2014_c180205.nc </bc_a4_ext_file>
+<mam7_num_a1_ext_file >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_num_a1_elev_1850-2014_c180205.nc </mam7_num_a1_ext_file>
+<num_a2_ext_file      >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_num_a2_elev_1850-2014_c180205.nc </num_a2_ext_file>
+<mam7_num_a3_ext_file >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_num_a4_elev_1850-2014_c180205.nc </mam7_num_a3_ext_file> <!-- This is to set num_a4 emissions -->
+<pom_a4_ext_file      >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_pom_a4_elev_1850-2014_c180205.nc </pom_a4_ext_file>
+<so4_a1_ext_file      >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_so4_a1_elev_1850-2014_c180205.nc </so4_a1_ext_file>
+<so4_a2_ext_file      >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_so4_a2_elev_1850-2014_c180205.nc </so4_a2_ext_file>
+
+<!-- Surface emissions for chemUCI-Linoz, MAM5, VBS SOA.  CMIP6 input4mips data -->
+<srf_emis_type        >CYCLICAL</srf_emis_type>
+<srf_emis_cycle_yr    >1850</srf_emis_cycle_yr>
+<c2h4_emis_file       >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_C2H4_surface_1850-2014_1.9x2.5_c20210323.nc </c2h4_emis_file>
+<c2h6_emis_file       >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_C2H6_surface_1850-2014_1.9x2.5_c20210323.nc </c2h6_emis_file>
+<c3h8_emis_file       >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_C3H8_surface_1850-2014_1.9x2.5_c20210323.nc </c3h8_emis_file>
+<ch2o_emis_file       >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_CH2O_surface_1850-2014_1.9x2.5_c20210323.nc </ch2o_emis_file>
+<ch3cho_emis_file     >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_CH3CHO_surface_1850-2014_1.9x2.5_c20210323.nc </ch3cho_emis_file>
+<ch3coch3_emis_file   >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_CH3COCH3_surface_1850-2014_1.9x2.5_c20210323.nc </ch3coch3_emis_file>
+<co_emis_file         >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_CO_surface_1850-2014_1.9x2.5_c20210323.nc </co_emis_file>
+<isop_emis_file       >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_ISOP_surface_1850-2014_1.9x2.5_c20210323.nc </isop_emis_file>
+<isop_vbs_emis_file   >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_ISOP_surface_1850-2014_1.9x2.5_c20210323.nc </isop_vbs_emis_file>
+<c10h16_emis_file     >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_MTERP_surface_1850-2014_1.9x2.5_c20230126.nc </c10h16_emis_file>
+<nox_emis_file        >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_NO_surface_1850-2014_1.9x2.5_c20220425.nc </nox_emis_file>
+<dms_emis_file	      >atm/cam/chem/trop_mozart_aero/emis/DMSflux.1850.1deg_latlon_conserv.POPmonthlyClimFromACES4BGC_c20160416.nc </dms_emis_file>
+<soag0_emis_file      >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/emissions-cmip6_e3sm_SOAG0_surf_1850-2014_1.9x2.5_c20230201.nc </soag0_emis_file>
+<so2_emis_file	      >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_so2_surf_1850-2014_c180205.nc </so2_emis_file>
+<bc_a4_emis_file      >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_bc_a4_surf_1850-2014_c180205.nc </bc_a4_emis_file>
+<mam7_num_a1_emis_file>atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_num_a1_surf_1850-2014_c180205.nc </mam7_num_a1_emis_file> 
+<num_a2_emis_file     >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_num_a2_surf_1850-2014_c180205.nc </num_a2_emis_file>
+<mam7_num_a3_emis_file>atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_num_a4_surf_1850-2014_c180205.nc </mam7_num_a3_emis_file> <!-- This is to set num_a4 emissions -->
+<pom_a4_emis_file     >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_pom_a4_surf_1850-2014_c180205.nc </pom_a4_emis_file>
+<so4_a1_emis_file     >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_so4_a1_surf_1850-2014_c180205.nc </so4_a1_emis_file>
+<so4_a2_emis_file     >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_so4_a2_surf_1850-2014_c180205.nc </so4_a2_emis_file>
+<e90_emis_file        >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions_E90_surface_1750-2015_1.9x2.5_c20210408.nc </e90_emis_file>
+
+<airpl_emis_file></airpl_emis_file>   <!-- need to be empty, but if specifying empty here, the value would be root of input_data_path -->
+
+<!-- Prescribed oxidants for aerosol chemistry.   Ozone is from CMIP6 input4MIPS file -->
+<tracer_cnst_type    >CYCLICAL</tracer_cnst_type>
+<tracer_cnst_cycle_yr>1849</tracer_cnst_cycle_yr>
+<tracer_cnst_file    >oxid_1.9x2.5_L26_1850-2015_c20181106.nc</tracer_cnst_file>
+<tracer_cnst_filelist>''</tracer_cnst_filelist>
+<tracer_cnst_datapath>atm/cam/chem/trop_mozart_aero/oxid</tracer_cnst_datapath>
+<tracer_cnst_specifier>'prsd_O3:O3','prsd_NO3:NO3','prsd_OH:OH'</tracer_cnst_specifier>
+
+<!-- prescribed methane  -->
+<prescribed_ghg_file      >ch4_oxid_1.9x2.5_L26_1990-1999clim.c090804.nc</prescribed_ghg_file>
+<prescribed_ghg_datapath  >atm/cam/chem/methane</prescribed_ghg_datapath>
+<prescribed_ghg_type      >CYCLICAL</prescribed_ghg_type>
+<prescribed_ghg_cycle_yr  >1995</prescribed_ghg_cycle_yr>
+<prescribed_ghg_filelist  >''</prescribed_ghg_filelist>
+<prescribed_ghg_specifier>'prsd_ch4:CH4'</prescribed_ghg_specifier>
+
+<!-- rad_climate -->
+<rad_climate>
+  'A:H2OLNZ:H2O', 'N:O2:O2', 'N:CO2:CO2',
+  'A:O3:O3', 'A:N2OLNZ:N2O', 'A:CH4LNZ:CH4',
+  'N:CFC11:CFC11', 'N:CFC12:CFC12',
+  'M:mam5_mode1:$INPUTDATA_ROOT/atm/cam/physprops/mam4_mode1_rrtmg_aeronetdust_c141106.nc',
+  'M:mam5_mode2:$INPUTDATA_ROOT/atm/cam/physprops/mam4_mode2_rrtmg_c130628.nc',
+  'M:mam5_mode3:$INPUTDATA_ROOT/atm/cam/physprops/mam4_mode3_rrtmg_aeronetdust_c141106.nc',
+  'M:mam5_mode4:$INPUTDATA_ROOT/atm/cam/physprops/mam4_mode4_rrtmg_c130628.nc',
+  'M:mam5_mode5:$INPUTDATA_ROOT/atm/cam/physprops/mam5_mode5_rrtmg_sig1.2_dgnl.40_c03072023.nc'
+</rad_climate>
+
+<!-- Marine organic aerosol namelist settings -->
+<mam_mom_mixing_state>3</mam_mom_mixing_state>
+<mam_mom_cycle_yr  >1                                                                                    </mam_mom_cycle_yr  >
+<mam_mom_datapath  >'atm/cam/chem/trop_mam/marine_BGC/'                                                  </mam_mom_datapath  >
+<mam_mom_datatype  >'CYCLICAL'										 </mam_mom_datatype  >
+<mam_mom_filename  >'monthly_macromolecules_0.1deg_bilinear_latlon_year01_merge_date.nc'                 </mam_mom_filename  > <!-- Using the 2000 file, for now -->
+<mam_mom_fixed_tod >0											 </mam_mom_fixed_tod >
+<mam_mom_fixed_ymd >0											 </mam_mom_fixed_ymd >
+<mam_mom_specifier >'chla:CHL1','mpoly:TRUEPOLYC','mprot:TRUEPROTC','mlip:TRUELIPC'			 </mam_mom_specifier >
+
+<chlorine_loading_file      >atm/cam/chem/trop_mozart/ub/Linoz_Chlorine_Loading_CMIP6_0003-2017_c20171114.nc</chlorine_loading_file>
+<chlorine_loading_fixed_ymd >18500101</chlorine_loading_fixed_ymd>
+<chlorine_loading_type      >FIXED</chlorine_loading_type>
+<linoz_data_cycle_yr        >1850</linoz_data_cycle_yr>
+<linoz_data_file            >linv3_1849-2017_CMIP6_Hist_10deg_58km_c20230705.nc</linoz_data_file>
+<linoz_data_path            >atm/cam/chem/trop_mozart/ub</linoz_data_path>
+<linoz_data_type            >CYCLICAL</linoz_data_type>
+
+<!-- Set surface area density (SAD) variables -->
+<sad_type>SERIAL</sad_type>
+
+<!-- Turn off ozone dry deposition, as Linoz O3v2 and ozone are not separated for now. Need to turn on ozone dry deposition when interactive tropospheric chemistry is implemented -->
+<drydep_method       >'xactive_lnd'</drydep_method>
+<drydep_list         >'O3','H2O2','CH2O','CH3OOH','NO','NO2','HNO3','HO2NO2','PAN','CO','CH3COCH3','C2H5OOH','CH3CHO','H2SO4','SO2','NO3','N2O5','SOAG0','SOAG15','SOAG24','SOAG35','SOAG34','SOAG33','SOAG32','SOAG31'</drydep_list>
+<gas_wetdep_method   >'NEU'</gas_wetdep_method>
+<gas_wetdep_list     >'C2H5OOH','CH2O','CH3CHO','CH3OOH','H2O2','H2SO4','HNO3','HO2NO2','SO2','SOAG0','SOAG15','SOAG24','SOAG35','SOAG34','SOAG33','SOAG32','SOAG31'</gas_wetdep_list>
+<fstrat_efold_list>'CH2O', 'CH3O2', 'CH3OOH', 'PAN', 'CO', 'C2H6', 'C3H8', 'C2H4', 'ROHO2', 'CH3COCH3', 'C2H5O2', 'C2H5OOH', 'CH3CHO', 'CH3CO3', 'ISOP', 'ISOPO2', 'MVKMACR', 'MVKO2'</fstrat_efold_list>
+<fstrat_list         >''</fstrat_list>
+</namelist_defaults>
diff --git a/components/eam/bld/namelist_files/use_cases/20TR_eam_CMIP6-ozone_chemUCI-Linoz-mam5-vbs.xml b/components/eam/bld/namelist_files/use_cases/20TR_eam_CMIP6-ozone_chemUCI-Linoz-mam5-vbs.xml
new file mode 100644
index 000000000000..58f69d8fe97f
--- /dev/null
+++ b/components/eam/bld/namelist_files/use_cases/20TR_eam_CMIP6-ozone_chemUCI-Linoz-mam5-vbs.xml
@@ -0,0 +1,121 @@
+<?xml version="1.0"?>
+<namelist_defaults>
+
+<!-- Set default output options for CMIP6 simulations -->
+<cosp_lite>.true.</cosp_lite>
+
+<!-- For comprehensive history -->
+<history_amwg>.true.</history_amwg>
+<history_aerosol>.true.</history_aerosol>
+<history_aero_optics>.true.</history_aero_optics>
+
+<!-- Solar constant from CMIP6 input4MIPS -->
+<solar_data_file>atm/cam/solar/Solar_1850control_input4MIPS_c20181106.nc</solar_data_file>
+<solar_data_ymd>18500101</solar_data_ymd>
+<solar_data_type>FIXED</solar_data_type>
+
+<!-- GHG values from CMIP6 input4MIPS -->
+<!-- <co2vmr>284.317e-6</co2vmr> The CMIP6 concentration set by CCSM_CO2_PPMV in cime/src/drivers/mct/cime_config/config_component_acme.xml -->
+<ch4vmr>808.249e-9</ch4vmr>
+<n2ovmr>273.0211e-9</n2ovmr>
+<f11vmr>32.1102e-12</f11vmr>
+<f12vmr>0.0</f12vmr>
+
+<!-- External forcing for BAM or MAM.  CMIP6 input4mips data. -->
+<!-- Need to use INTERP_MISSING_MONTHS for ext_frc_volc_type to go with ths updated SO2 file -->
+<ext_frc_type         >CYCLICAL</ext_frc_type>
+<ext_frc_cycle_yr     >1850</ext_frc_cycle_yr>
+<no2_ext_file         >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_NO2_aircraft_vertical_1750-2015_1.9x2.5_c20170608.nc </no2_ext_file>
+<so2_ext_file         >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_1850_2014_avg_so2_elev_strat_1850.nc </so2_ext_file>
+<soag0_ext_file	      >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/emissions-cmip6_e3sm_SOAG0_elev_1850-2014_1.9x2.5_c20230201.nc </soag0_ext_file>
+<bc_a4_ext_file       >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_bc_a4_elev_1850-2014_c180205.nc </bc_a4_ext_file>
+<mam7_num_a1_ext_file >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_num_a1_elev_1850-2014_c180205.nc </mam7_num_a1_ext_file>
+<num_a2_ext_file      >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_num_a2_elev_1850-2014_c180205.nc </num_a2_ext_file>
+<mam7_num_a3_ext_file >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_num_a4_elev_1850-2014_c180205.nc </mam7_num_a3_ext_file> <!-- This is to set num_a4 emissions -->
+<pom_a4_ext_file      >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_pom_a4_elev_1850-2014_c180205.nc </pom_a4_ext_file>
+<so4_a1_ext_file      >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_so4_a1_elev_1850-2014_c180205.nc </so4_a1_ext_file>
+<so4_a2_ext_file      >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_so4_a2_elev_1850-2014_c180205.nc </so4_a2_ext_file>
+
+<!-- Surface emissions for chemUCI-Linoz, MAM5, VBS SOA.  CMIP6 input4mips data -->
+<srf_emis_type        >CYCLICAL</srf_emis_type>
+<srf_emis_cycle_yr    >1850</srf_emis_cycle_yr>
+<c2h4_emis_file       >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_C2H4_surface_1850-2014_1.9x2.5_c20210323.nc </c2h4_emis_file>
+<c2h6_emis_file       >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_C2H6_surface_1850-2014_1.9x2.5_c20210323.nc </c2h6_emis_file>
+<c3h8_emis_file       >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_C3H8_surface_1850-2014_1.9x2.5_c20210323.nc </c3h8_emis_file>
+<ch2o_emis_file       >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_CH2O_surface_1850-2014_1.9x2.5_c20210323.nc </ch2o_emis_file>
+<ch3cho_emis_file     >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_CH3CHO_surface_1850-2014_1.9x2.5_c20210323.nc </ch3cho_emis_file>
+<ch3coch3_emis_file   >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_CH3COCH3_surface_1850-2014_1.9x2.5_c20210323.nc </ch3coch3_emis_file>
+<co_emis_file         >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_CO_surface_1850-2014_1.9x2.5_c20210323.nc </co_emis_file>
+<isop_emis_file       >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_ISOP_surface_1850-2014_1.9x2.5_c20210323.nc </isop_emis_file>
+<isop_vbs_emis_file   >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_ISOP_surface_1850-2014_1.9x2.5_c20210323.nc </isop_vbs_emis_file>
+<c10h16_emis_file     >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_MTERP_surface_1850-2014_1.9x2.5_c20230126.nc </c10h16_emis_file>
+<nox_emis_file        >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_NO_surface_1850-2014_1.9x2.5_c20220425.nc </nox_emis_file>
+<dms_emis_file	      >atm/cam/chem/trop_mozart_aero/emis/DMSflux.1850.1deg_latlon_conserv.POPmonthlyClimFromACES4BGC_c20160416.nc </dms_emis_file>
+<soag0_emis_file      >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/emissions-cmip6_e3sm_SOAG0_surf_1850-2014_1.9x2.5_c20230201.nc </soag0_emis_file>
+<so2_emis_file	      >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_so2_surf_1850-2014_c180205.nc </so2_emis_file>
+<bc_a4_emis_file      >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_bc_a4_surf_1850-2014_c180205.nc </bc_a4_emis_file>
+<mam7_num_a1_emis_file>atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_num_a1_surf_1850-2014_c180205.nc </mam7_num_a1_emis_file> 
+<num_a2_emis_file     >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_num_a2_surf_1850-2014_c180205.nc </num_a2_emis_file>
+<mam7_num_a3_emis_file>atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_num_a4_surf_1850-2014_c180205.nc </mam7_num_a3_emis_file> <!-- This is to set num_a4 emissions -->
+<pom_a4_emis_file     >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_pom_a4_surf_1850-2014_c180205.nc </pom_a4_emis_file>
+<so4_a1_emis_file     >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_so4_a1_surf_1850-2014_c180205.nc </so4_a1_emis_file>
+<so4_a2_emis_file     >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_so4_a2_surf_1850-2014_c180205.nc </so4_a2_emis_file>
+<e90_emis_file        >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions_E90_surface_1750-2015_1.9x2.5_c20210408.nc </e90_emis_file>
+
+<airpl_emis_file></airpl_emis_file>   <!-- need to be empty, but if specifying empty here, the value would be root of input_data_path -->
+
+<!-- Prescribed oxidants for aerosol chemistry.   Ozone is from CMIP6 input4MIPS file -->
+<tracer_cnst_type    >CYCLICAL</tracer_cnst_type>
+<tracer_cnst_cycle_yr>1849</tracer_cnst_cycle_yr>
+<tracer_cnst_file    >oxid_1.9x2.5_L26_1850-2015_c20181106.nc</tracer_cnst_file>
+<tracer_cnst_filelist>''</tracer_cnst_filelist>
+<tracer_cnst_datapath>atm/cam/chem/trop_mozart_aero/oxid</tracer_cnst_datapath>
+<tracer_cnst_specifier>'prsd_O3:O3','prsd_NO3:NO3','prsd_OH:OH'</tracer_cnst_specifier>
+
+<!-- prescribed methane  -->
+<prescribed_ghg_file      >ch4_oxid_1.9x2.5_L26_1990-1999clim.c090804.nc</prescribed_ghg_file>
+<prescribed_ghg_datapath  >atm/cam/chem/methane</prescribed_ghg_datapath>
+<prescribed_ghg_type      >CYCLICAL</prescribed_ghg_type>
+<prescribed_ghg_cycle_yr  >1995</prescribed_ghg_cycle_yr>
+<prescribed_ghg_filelist  >''</prescribed_ghg_filelist>
+<prescribed_ghg_specifier>'prsd_ch4:CH4'</prescribed_ghg_specifier>
+
+<!-- rad_climate -->
+<rad_climate>
+  'A:H2OLNZ:H2O', 'N:O2:O2', 'N:CO2:CO2',
+  'A:O3:O3', 'A:N2OLNZ:N2O', 'A:CH4LNZ:CH4',
+  'N:CFC11:CFC11', 'N:CFC12:CFC12',
+  'M:mam5_mode1:$INPUTDATA_ROOT/atm/cam/physprops/mam4_mode1_rrtmg_aeronetdust_c141106.nc',
+  'M:mam5_mode2:$INPUTDATA_ROOT/atm/cam/physprops/mam4_mode2_rrtmg_c130628.nc',
+  'M:mam5_mode3:$INPUTDATA_ROOT/atm/cam/physprops/mam4_mode3_rrtmg_aeronetdust_c141106.nc',
+  'M:mam5_mode4:$INPUTDATA_ROOT/atm/cam/physprops/mam4_mode4_rrtmg_c130628.nc',
+  'M:mam5_mode5:$INPUTDATA_ROOT/atm/cam/physprops/mam5_mode5_rrtmg_sig1.2_dgnl.40_c03072023.nc'
+</rad_climate>
+
+<!-- Marine organic aerosol namelist settings -->
+<mam_mom_mixing_state>3</mam_mom_mixing_state>
+<mam_mom_cycle_yr  >1                                                                                    </mam_mom_cycle_yr  >
+<mam_mom_datapath  >'atm/cam/chem/trop_mam/marine_BGC/'                                                  </mam_mom_datapath  >
+<mam_mom_datatype  >'CYCLICAL'										 </mam_mom_datatype  >
+<mam_mom_filename  >'monthly_macromolecules_0.1deg_bilinear_latlon_year01_merge_date.nc'                 </mam_mom_filename  > <!-- Using the 2000 file, for now -->
+<mam_mom_fixed_tod >0											 </mam_mom_fixed_tod >
+<mam_mom_fixed_ymd >0											 </mam_mom_fixed_ymd >
+<mam_mom_specifier >'chla:CHL1','mpoly:TRUEPOLYC','mprot:TRUEPROTC','mlip:TRUELIPC'			 </mam_mom_specifier >
+
+<chlorine_loading_file      >atm/cam/chem/trop_mozart/ub/Linoz_Chlorine_Loading_CMIP6_0003-2017_c20171114.nc</chlorine_loading_file>
+<chlorine_loading_type      >SERIAL</chlorine_loading_type>
+<linoz_data_file            >linv3_1849-2017_CMIP6_Hist_10deg_58km_c20230705.nc</linoz_data_file>
+<linoz_data_path            >atm/cam/chem/trop_mozart/ub</linoz_data_path>
+<linoz_data_type            >INTERP_MISSING_MONTHS</linoz_data_type>
+
+<!-- Set surface area density (SAD) variables -->
+<sad_type>SERIAL</sad_type>
+
+<!-- Turn off ozone dry deposition, as Linoz O3v2 and ozone are not separated for now. Need to turn on ozone dry deposition when interactive tropospheric chemistry is implemented -->
+<drydep_method       >'xactive_lnd'</drydep_method>
+<drydep_list         >'O3','H2O2','CH2O','CH3OOH','NO','NO2','HNO3','HO2NO2','PAN','CO','CH3COCH3','C2H5OOH','CH3CHO','H2SO4','SO2','NO3','N2O5','SOAG0','SOAG15','SOAG24','SOAG35','SOAG34','SOAG33','SOAG32','SOAG31'</drydep_list>
+<gas_wetdep_method   >'NEU'</gas_wetdep_method>
+<gas_wetdep_list     >'C2H5OOH','CH2O','CH3CHO','CH3OOH','H2O2','H2SO4','HNO3','HO2NO2','SO2','SOAG0','SOAG15','SOAG24','SOAG35','SOAG34','SOAG33','SOAG32','SOAG31'</gas_wetdep_list>
+<fstrat_efold_list>'CH2O', 'CH3O2', 'CH3OOH', 'PAN', 'CO', 'C2H6', 'C3H8', 'C2H4', 'ROHO2', 'CH3COCH3', 'C2H5O2', 'C2H5OOH', 'CH3CHO', 'CH3CO3', 'ISOP', 'ISOPO2', 'MVKMACR', 'MVKO2'</fstrat_efold_list>
+<fstrat_list         >''</fstrat_list>
+</namelist_defaults>
diff --git a/components/eam/bld/namelist_files/use_cases/20TR_eam_CMIP6-volc_chemUCI-Linoz-mam5-vbs.xml b/components/eam/bld/namelist_files/use_cases/20TR_eam_CMIP6-volc_chemUCI-Linoz-mam5-vbs.xml
new file mode 100644
index 000000000000..83d4c4d92717
--- /dev/null
+++ b/components/eam/bld/namelist_files/use_cases/20TR_eam_CMIP6-volc_chemUCI-Linoz-mam5-vbs.xml
@@ -0,0 +1,124 @@
+<?xml version="1.0"?>
+<namelist_defaults>
+
+<!-- Set default output options for CMIP6 simulations -->
+<cosp_lite>.true.</cosp_lite>
+
+<!-- For comprehensive history -->
+<history_amwg>.true.</history_amwg>
+<history_aerosol>.true.</history_aerosol>
+<history_aero_optics>.true.</history_aero_optics>
+
+<!-- Solar constant from CMIP6 input4MIPS -->
+<solar_data_file>atm/cam/solar/Solar_1850control_input4MIPS_c20181106.nc</solar_data_file>
+<solar_data_ymd>18500101</solar_data_ymd>
+<solar_data_type>FIXED</solar_data_type>
+
+<!-- GHG values from CMIP6 input4MIPS -->
+<!-- <co2vmr>284.317e-6</co2vmr> The CMIP6 concentration set by CCSM_CO2_PPMV in cime/src/drivers/mct/cime_config/config_component_acme.xml -->
+<ch4vmr>808.249e-9</ch4vmr>
+<n2ovmr>273.0211e-9</n2ovmr>
+<f11vmr>32.1102e-12</f11vmr>
+<f12vmr>0.0</f12vmr>
+
+<!-- External forcing for BAM or MAM.  CMIP6 input4mips data. SO2 file contains historical volcanic but 1850 for other sectors -->
+<!-- Need to use INTERP_MISSING_MONTHS for ext_frc_volc_type to go with ths updated SO2 file -->
+<ext_frc_volc_type    >INTERP_MISSING_MONTHS</ext_frc_volc_type>
+<ext_frc_type         >CYCLICAL</ext_frc_type>
+<ext_frc_cycle_yr     >1850</ext_frc_cycle_yr>
+<no2_ext_file         >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_NO2_aircraft_vertical_1750-2015_1.9x2.5_c20170608.nc </no2_ext_file>
+<so2_ext_file         >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_so2_elev_1850-2014_c180205_1850-aero_hist-volcano.nc </so2_ext_file>
+<soag0_ext_file	      >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/emissions-cmip6_e3sm_SOAG0_elev_1850-2014_1.9x2.5_c20230201.nc </soag0_ext_file>
+<bc_a4_ext_file       >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_bc_a4_elev_1850-2014_c180205.nc </bc_a4_ext_file>
+<mam7_num_a1_ext_file >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_num_a1_elev_1850-2014_c180205.nc </mam7_num_a1_ext_file>
+<num_a2_ext_file      >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_num_a2_elev_1850-2014_c180205.nc </num_a2_ext_file>
+<mam7_num_a3_ext_file >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_num_a4_elev_1850-2014_c180205.nc </mam7_num_a3_ext_file> <!-- This is to set num_a4 emissions -->
+<pom_a4_ext_file      >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_pom_a4_elev_1850-2014_c180205.nc </pom_a4_ext_file>
+<so4_a1_ext_file      >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_so4_a1_elev_1850-2014_c180205.nc </so4_a1_ext_file>
+<so4_a2_ext_file      >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_so4_a2_elev_1850-2014_c180205.nc </so4_a2_ext_file>
+
+<!-- Surface emissions for chemUCI-Linoz, MAM5, VBS SOA.  CMIP6 input4mips data -->
+<srf_emis_type        >CYCLICAL</srf_emis_type>
+<srf_emis_cycle_yr    >1850</srf_emis_cycle_yr>
+<c2h4_emis_file       >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_C2H4_surface_1850-2014_1.9x2.5_c20210323.nc </c2h4_emis_file>
+<c2h6_emis_file       >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_C2H6_surface_1850-2014_1.9x2.5_c20210323.nc </c2h6_emis_file>
+<c3h8_emis_file       >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_C3H8_surface_1850-2014_1.9x2.5_c20210323.nc </c3h8_emis_file>
+<ch2o_emis_file       >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_CH2O_surface_1850-2014_1.9x2.5_c20210323.nc </ch2o_emis_file>
+<ch3cho_emis_file     >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_CH3CHO_surface_1850-2014_1.9x2.5_c20210323.nc </ch3cho_emis_file>
+<ch3coch3_emis_file   >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_CH3COCH3_surface_1850-2014_1.9x2.5_c20210323.nc </ch3coch3_emis_file>
+<co_emis_file         >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_CO_surface_1850-2014_1.9x2.5_c20210323.nc </co_emis_file>
+<isop_emis_file       >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_ISOP_surface_1850-2014_1.9x2.5_c20210323.nc </isop_emis_file>
+<isop_vbs_emis_file   >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_ISOP_surface_1850-2014_1.9x2.5_c20210323.nc </isop_vbs_emis_file>
+<c10h16_emis_file     >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_MTERP_surface_1850-2014_1.9x2.5_c20230126.nc </c10h16_emis_file>
+<nox_emis_file        >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_NO_surface_1850-2014_1.9x2.5_c20220425.nc </nox_emis_file>
+<dms_emis_file	      >atm/cam/chem/trop_mozart_aero/emis/DMSflux.1850.1deg_latlon_conserv.POPmonthlyClimFromACES4BGC_c20160416.nc </dms_emis_file>
+<soag0_emis_file      >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/emissions-cmip6_e3sm_SOAG0_surf_1850-2014_1.9x2.5_c20230201.nc </soag0_emis_file>
+<so2_emis_file	      >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_so2_surf_1850-2014_c180205.nc </so2_emis_file>
+<bc_a4_emis_file      >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_bc_a4_surf_1850-2014_c180205.nc </bc_a4_emis_file>
+<mam7_num_a1_emis_file>atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_num_a1_surf_1850-2014_c180205.nc </mam7_num_a1_emis_file> 
+<num_a2_emis_file     >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_num_a2_surf_1850-2014_c180205.nc </num_a2_emis_file>
+<mam7_num_a3_emis_file>atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_num_a4_surf_1850-2014_c180205.nc </mam7_num_a3_emis_file> <!-- This is to set num_a4 emissions -->
+<pom_a4_emis_file     >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_pom_a4_surf_1850-2014_c180205.nc </pom_a4_emis_file>
+<so4_a1_emis_file     >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_so4_a1_surf_1850-2014_c180205.nc </so4_a1_emis_file>
+<so4_a2_emis_file     >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_so4_a2_surf_1850-2014_c180205.nc </so4_a2_emis_file>
+<e90_emis_file        >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions_E90_surface_1750-2015_1.9x2.5_c20210408.nc </e90_emis_file>
+
+<airpl_emis_file></airpl_emis_file>   <!-- need to be empty, but if specifying empty here, the value would be root of input_data_path -->
+
+<!-- Prescribed oxidants for aerosol chemistry.   Ozone is from CMIP6 input4MIPS file -->
+<tracer_cnst_type    >CYCLICAL</tracer_cnst_type>
+<tracer_cnst_cycle_yr>1849</tracer_cnst_cycle_yr>
+<tracer_cnst_file    >oxid_1.9x2.5_L26_1850-2015_c20181106.nc</tracer_cnst_file>
+<tracer_cnst_filelist>''</tracer_cnst_filelist>
+<tracer_cnst_datapath>atm/cam/chem/trop_mozart_aero/oxid</tracer_cnst_datapath>
+<tracer_cnst_specifier>'prsd_O3:O3','prsd_NO3:NO3','prsd_OH:OH'</tracer_cnst_specifier>
+
+<!-- prescribed methane  -->
+<prescribed_ghg_file      >ch4_oxid_1.9x2.5_L26_1990-1999clim.c090804.nc</prescribed_ghg_file>
+<prescribed_ghg_datapath  >atm/cam/chem/methane</prescribed_ghg_datapath>
+<prescribed_ghg_type      >CYCLICAL</prescribed_ghg_type>
+<prescribed_ghg_cycle_yr  >1995</prescribed_ghg_cycle_yr>
+<prescribed_ghg_filelist  >''</prescribed_ghg_filelist>
+<prescribed_ghg_specifier>'prsd_ch4:CH4'</prescribed_ghg_specifier>
+
+<!-- rad_climate -->
+<rad_climate>
+  'A:H2OLNZ:H2O', 'N:O2:O2', 'N:CO2:CO2',
+  'A:O3:O3', 'A:N2OLNZ:N2O', 'A:CH4LNZ:CH4',
+  'N:CFC11:CFC11', 'N:CFC12:CFC12',
+  'M:mam5_mode1:$INPUTDATA_ROOT/atm/cam/physprops/mam4_mode1_rrtmg_aeronetdust_c141106.nc',
+  'M:mam5_mode2:$INPUTDATA_ROOT/atm/cam/physprops/mam4_mode2_rrtmg_c130628.nc',
+  'M:mam5_mode3:$INPUTDATA_ROOT/atm/cam/physprops/mam4_mode3_rrtmg_aeronetdust_c141106.nc',
+  'M:mam5_mode4:$INPUTDATA_ROOT/atm/cam/physprops/mam4_mode4_rrtmg_c130628.nc',
+  'M:mam5_mode5:$INPUTDATA_ROOT/atm/cam/physprops/mam5_mode5_rrtmg_sig1.2_dgnl.40_c03072023.nc'
+</rad_climate>
+
+<!-- Marine organic aerosol namelist settings -->
+<mam_mom_mixing_state>3</mam_mom_mixing_state>
+<mam_mom_cycle_yr  >1                                                                                    </mam_mom_cycle_yr  >
+<mam_mom_datapath  >'atm/cam/chem/trop_mam/marine_BGC/'                                                  </mam_mom_datapath  >
+<mam_mom_datatype  >'CYCLICAL'										 </mam_mom_datatype  >
+<mam_mom_filename  >'monthly_macromolecules_0.1deg_bilinear_latlon_year01_merge_date.nc'                 </mam_mom_filename  > <!-- Using the 2000 file, for now -->
+<mam_mom_fixed_tod >0											 </mam_mom_fixed_tod >
+<mam_mom_fixed_ymd >0											 </mam_mom_fixed_ymd >
+<mam_mom_specifier >'chla:CHL1','mpoly:TRUEPOLYC','mprot:TRUEPROTC','mlip:TRUELIPC'			 </mam_mom_specifier >
+
+<chlorine_loading_file      >atm/cam/chem/trop_mozart/ub/Linoz_Chlorine_Loading_CMIP6_0003-2017_c20171114.nc</chlorine_loading_file>
+<chlorine_loading_fixed_ymd >18500101</chlorine_loading_fixed_ymd>
+<chlorine_loading_type      >FIXED</chlorine_loading_type>
+<linoz_data_cycle_yr        >1850</linoz_data_cycle_yr>
+<linoz_data_file            >linv3_1849-2017_CMIP6_Hist_10deg_58km_c20230705.nc</linoz_data_file>
+<linoz_data_path            >atm/cam/chem/trop_mozart/ub</linoz_data_path>
+<linoz_data_type            >CYCLICAL</linoz_data_type>
+
+<!-- Set surface area density (SAD) variables -->
+<sad_type>SERIAL</sad_type>
+
+<!-- Turn off ozone dry deposition, as Linoz O3v2 and ozone are not separated for now. Need to turn on ozone dry deposition when interactive tropospheric chemistry is implemented -->
+<drydep_method       >'xactive_lnd'</drydep_method>
+<drydep_list         >'O3','H2O2','CH2O','CH3OOH','NO','NO2','HNO3','HO2NO2','PAN','CO','CH3COCH3','C2H5OOH','CH3CHO','H2SO4','SO2','NO3','N2O5','SOAG0','SOAG15','SOAG24','SOAG35','SOAG34','SOAG33','SOAG32','SOAG31'</drydep_list>
+<gas_wetdep_method   >'NEU'</gas_wetdep_method>
+<gas_wetdep_list     >'C2H5OOH','CH2O','CH3CHO','CH3OOH','H2O2','H2SO4','HNO3','HO2NO2','SO2','SOAG0','SOAG15','SOAG24','SOAG35','SOAG34','SOAG33','SOAG32','SOAG31'</gas_wetdep_list>
+<fstrat_efold_list>'CH2O', 'CH3O2', 'CH3OOH', 'PAN', 'CO', 'C2H6', 'C3H8', 'C2H4', 'ROHO2', 'CH3COCH3', 'C2H5O2', 'C2H5OOH', 'CH3CHO', 'CH3CO3', 'ISOP', 'ISOPO2', 'MVKMACR', 'MVKO2'</fstrat_efold_list>
+<fstrat_list         >''</fstrat_list>
+</namelist_defaults>
diff --git a/components/eam/bld/namelist_files/use_cases/20TR_eam_CMIP6-xGHG-xaer_chemUCI-Linoz-mam5-vbs.xml b/components/eam/bld/namelist_files/use_cases/20TR_eam_CMIP6-xGHG-xaer_chemUCI-Linoz-mam5-vbs.xml
new file mode 100644
index 000000000000..671eb826ef14
--- /dev/null
+++ b/components/eam/bld/namelist_files/use_cases/20TR_eam_CMIP6-xGHG-xaer_chemUCI-Linoz-mam5-vbs.xml
@@ -0,0 +1,121 @@
+<?xml version="1.0"?>
+<namelist_defaults>
+
+<!-- Set default output options for CMIP6 simulations -->
+<cosp_lite>.true.</cosp_lite>
+
+<!-- For comprehensive history -->
+<history_amwg>.true.</history_amwg>
+<history_aerosol>.true.</history_aerosol>
+<history_aero_optics>.true.</history_aero_optics>
+
+<!-- Solar constant from CMIP6 input4MIPS -->
+<solar_data_file>atm/cam/solar/Solar_1850-2299_input4MIPS_c20181106.nc</solar_data_file>
+<solar_data_type>SERIAL</solar_data_type>
+
+<!-- GHG values from CMIP6 input4MIPS -->
+<!-- <co2vmr>284.317e-6</co2vmr> The CMIP6 concentration set by CCSM_CO2_PPMV in cime/src/drivers/mct/cime_config/config_component_acme.xml -->
+<ch4vmr>808.249e-9</ch4vmr>
+<n2ovmr>273.0211e-9</n2ovmr>
+<f11vmr>32.1102e-12</f11vmr>
+<f12vmr>0.0</f12vmr>
+
+<!-- External forcing for BAM or MAM.  CMIP6 input4mips data. SO2 file contains historical volcanic but 1850 for other sectors -->
+<!-- Need to use INTERP_MISSING_MONTHS for ext_frc_volc_type to go with ths updated SO2 file -->
+<ext_frc_volc_type    >INTERP_MISSING_MONTHS</ext_frc_volc_type>
+<ext_frc_type         >CYCLICAL</ext_frc_type>
+<ext_frc_cycle_yr     >1850</ext_frc_cycle_yr>
+<no2_ext_file         >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_NO2_aircraft_vertical_1750-2015_1.9x2.5_c20170608.nc </no2_ext_file>
+<so2_ext_file         >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_so2_elev_1850-2014_c180205_1850-aero_hist-volcano.nc </so2_ext_file>
+<soag0_ext_file	      >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/emissions-cmip6_e3sm_SOAG0_elev_1850-2014_1.9x2.5_c20230201.nc </soag0_ext_file>
+<bc_a4_ext_file       >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_bc_a4_elev_1850-2014_c180205.nc </bc_a4_ext_file>
+<mam7_num_a1_ext_file >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_num_a1_elev_1850-2014_c180205.nc </mam7_num_a1_ext_file>
+<num_a2_ext_file      >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_num_a2_elev_1850-2014_c180205.nc </num_a2_ext_file>
+<mam7_num_a3_ext_file >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_num_a4_elev_1850-2014_c180205.nc </mam7_num_a3_ext_file> <!-- This is to set num_a4 emissions -->
+<pom_a4_ext_file      >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_pom_a4_elev_1850-2014_c180205.nc </pom_a4_ext_file>
+<so4_a1_ext_file      >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_so4_a1_elev_1850-2014_c180205.nc </so4_a1_ext_file>
+<so4_a2_ext_file      >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_so4_a2_elev_1850-2014_c180205.nc </so4_a2_ext_file>
+
+<!-- Surface emissions for chemUCI-Linoz, MAM5, VBS SOA.  CMIP6 input4mips data -->
+<srf_emis_type        >CYCLICAL</srf_emis_type>
+<srf_emis_cycle_yr    >1850</srf_emis_cycle_yr>
+<c2h4_emis_file       >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_C2H4_surface_1850-2014_1.9x2.5_c20210323.nc </c2h4_emis_file>
+<c2h6_emis_file       >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_C2H6_surface_1850-2014_1.9x2.5_c20210323.nc </c2h6_emis_file>
+<c3h8_emis_file       >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_C3H8_surface_1850-2014_1.9x2.5_c20210323.nc </c3h8_emis_file>
+<ch2o_emis_file       >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_CH2O_surface_1850-2014_1.9x2.5_c20210323.nc </ch2o_emis_file>
+<ch3cho_emis_file     >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_CH3CHO_surface_1850-2014_1.9x2.5_c20210323.nc </ch3cho_emis_file>
+<ch3coch3_emis_file   >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_CH3COCH3_surface_1850-2014_1.9x2.5_c20210323.nc </ch3coch3_emis_file>
+<co_emis_file         >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_CO_surface_1850-2014_1.9x2.5_c20210323.nc </co_emis_file>
+<isop_emis_file       >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_ISOP_surface_1850-2014_1.9x2.5_c20210323.nc </isop_emis_file>
+<isop_vbs_emis_file   >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_ISOP_surface_1850-2014_1.9x2.5_c20210323.nc </isop_vbs_emis_file>
+<c10h16_emis_file     >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_MTERP_surface_1850-2014_1.9x2.5_c20230126.nc </c10h16_emis_file>
+<nox_emis_file        >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_NO_surface_1850-2014_1.9x2.5_c20220425.nc </nox_emis_file>
+<dms_emis_file	      >atm/cam/chem/trop_mozart_aero/emis/DMSflux.1850.1deg_latlon_conserv.POPmonthlyClimFromACES4BGC_c20160416.nc </dms_emis_file>
+<soag0_emis_file      >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/emissions-cmip6_e3sm_SOAG0_surf_1850-2014_1.9x2.5_c20230201.nc </soag0_emis_file>
+<so2_emis_file	      >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_so2_surf_1850-2014_c180205.nc </so2_emis_file>
+<bc_a4_emis_file      >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_bc_a4_surf_1850-2014_c180205.nc </bc_a4_emis_file>
+<mam7_num_a1_emis_file>atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_num_a1_surf_1850-2014_c180205.nc </mam7_num_a1_emis_file> 
+<num_a2_emis_file     >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_num_a2_surf_1850-2014_c180205.nc </num_a2_emis_file>
+<mam7_num_a3_emis_file>atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_num_a4_surf_1850-2014_c180205.nc </mam7_num_a3_emis_file> <!-- This is to set num_a4 emissions -->
+<pom_a4_emis_file     >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_pom_a4_surf_1850-2014_c180205.nc </pom_a4_emis_file>
+<so4_a1_emis_file     >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_so4_a1_surf_1850-2014_c180205.nc </so4_a1_emis_file>
+<so4_a2_emis_file     >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_so4_a2_surf_1850-2014_c180205.nc </so4_a2_emis_file>
+<e90_emis_file        >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions_E90_surface_1750-2015_1.9x2.5_c20210408.nc </e90_emis_file>
+
+<airpl_emis_file></airpl_emis_file>   <!-- need to be empty, but if specifying empty here, the value would be root of input_data_path -->
+
+<!-- Prescribed oxidants for aerosol chemistry.   Ozone is from CMIP6 input4MIPS file -->
+<tracer_cnst_type    >CYCLICAL</tracer_cnst_type>
+<tracer_cnst_cycle_yr>1849</tracer_cnst_cycle_yr>
+<tracer_cnst_file    >oxid_1.9x2.5_L26_1850-2015_c20181106.nc</tracer_cnst_file>
+<tracer_cnst_filelist>''</tracer_cnst_filelist>
+<tracer_cnst_datapath>atm/cam/chem/trop_mozart_aero/oxid</tracer_cnst_datapath>
+<tracer_cnst_specifier>'prsd_O3:O3','prsd_NO3:NO3','prsd_OH:OH'</tracer_cnst_specifier>
+
+<!-- prescribed methane  -->
+<prescribed_ghg_file      >ch4_oxid_1.9x2.5_L26_1990-1999clim.c090804.nc</prescribed_ghg_file>
+<prescribed_ghg_datapath  >atm/cam/chem/methane</prescribed_ghg_datapath>
+<prescribed_ghg_type      >CYCLICAL</prescribed_ghg_type>
+<prescribed_ghg_cycle_yr  >1995</prescribed_ghg_cycle_yr>
+<prescribed_ghg_filelist  >''</prescribed_ghg_filelist>
+<prescribed_ghg_specifier>'prsd_ch4:CH4'</prescribed_ghg_specifier>
+
+<!-- rad_climate -->
+<rad_climate>
+  'A:H2OLNZ:H2O', 'N:O2:O2', 'N:CO2:CO2',
+  'A:O3:O3', 'A:N2OLNZ:N2O', 'A:CH4LNZ:CH4',
+  'N:CFC11:CFC11', 'N:CFC12:CFC12',
+  'M:mam5_mode1:$INPUTDATA_ROOT/atm/cam/physprops/mam4_mode1_rrtmg_aeronetdust_c141106.nc',
+  'M:mam5_mode2:$INPUTDATA_ROOT/atm/cam/physprops/mam4_mode2_rrtmg_c130628.nc',
+  'M:mam5_mode3:$INPUTDATA_ROOT/atm/cam/physprops/mam4_mode3_rrtmg_aeronetdust_c141106.nc',
+  'M:mam5_mode4:$INPUTDATA_ROOT/atm/cam/physprops/mam4_mode4_rrtmg_c130628.nc',
+  'M:mam5_mode5:$INPUTDATA_ROOT/atm/cam/physprops/mam5_mode5_rrtmg_sig1.2_dgnl.40_c03072023.nc'
+</rad_climate>
+
+<!-- Marine organic aerosol namelist settings -->
+<mam_mom_mixing_state>3</mam_mom_mixing_state>
+<mam_mom_cycle_yr  >1                                                                                    </mam_mom_cycle_yr  >
+<mam_mom_datapath  >'atm/cam/chem/trop_mam/marine_BGC/'                                                  </mam_mom_datapath  >
+<mam_mom_datatype  >'CYCLICAL'										 </mam_mom_datatype  >
+<mam_mom_filename  >'monthly_macromolecules_0.1deg_bilinear_latlon_year01_merge_date.nc'                 </mam_mom_filename  > <!-- Using the 2000 file, for now -->
+<mam_mom_fixed_tod >0											 </mam_mom_fixed_tod >
+<mam_mom_fixed_ymd >0											 </mam_mom_fixed_ymd >
+<mam_mom_specifier >'chla:CHL1','mpoly:TRUEPOLYC','mprot:TRUEPROTC','mlip:TRUELIPC'			 </mam_mom_specifier >
+
+<chlorine_loading_file      >atm/cam/chem/trop_mozart/ub/Linoz_Chlorine_Loading_CMIP6_0003-2017_c20171114.nc</chlorine_loading_file>
+<chlorine_loading_type      >SERIAL</chlorine_loading_type>
+<linoz_data_file            >linv3_1849-2017_CMIP6_Hist_10deg_58km_c20230705.nc</linoz_data_file>
+<linoz_data_path            >atm/cam/chem/trop_mozart/ub</linoz_data_path>
+<linoz_data_type            >INTERP_MISSING_MONTHS</linoz_data_type>
+
+<!-- Set surface area density (SAD) variables -->
+<sad_type>SERIAL</sad_type>
+
+<!-- Turn off ozone dry deposition, as Linoz O3v2 and ozone are not separated for now. Need to turn on ozone dry deposition when interactive tropospheric chemistry is implemented -->
+<drydep_method       >'xactive_lnd'</drydep_method>
+<drydep_list         >'O3','H2O2','CH2O','CH3OOH','NO','NO2','HNO3','HO2NO2','PAN','CO','CH3COCH3','C2H5OOH','CH3CHO','H2SO4','SO2','NO3','N2O5','SOAG0','SOAG15','SOAG24','SOAG35','SOAG34','SOAG33','SOAG32','SOAG31'</drydep_list>
+<gas_wetdep_method   >'NEU'</gas_wetdep_method>
+<gas_wetdep_list     >'C2H5OOH','CH2O','CH3CHO','CH3OOH','H2O2','H2SO4','HNO3','HO2NO2','SO2','SOAG0','SOAG15','SOAG24','SOAG35','SOAG34','SOAG33','SOAG32','SOAG31'</gas_wetdep_list>
+<fstrat_efold_list>'CH2O', 'CH3O2', 'CH3OOH', 'PAN', 'CO', 'C2H6', 'C3H8', 'C2H4', 'ROHO2', 'CH3COCH3', 'C2H5O2', 'C2H5OOH', 'CH3CHO', 'CH3CO3', 'ISOP', 'ISOPO2', 'MVKMACR', 'MVKO2'</fstrat_efold_list>
+<fstrat_list         >''</fstrat_list>
+</namelist_defaults>
diff --git a/components/eam/bld/namelist_files/use_cases/20TR_eam_CMIP6-xaer_chemUCI-Linoz-mam5-vbs.xml b/components/eam/bld/namelist_files/use_cases/20TR_eam_CMIP6-xaer_chemUCI-Linoz-mam5-vbs.xml
new file mode 100644
index 000000000000..8dd525d7e5d3
--- /dev/null
+++ b/components/eam/bld/namelist_files/use_cases/20TR_eam_CMIP6-xaer_chemUCI-Linoz-mam5-vbs.xml
@@ -0,0 +1,118 @@
+<?xml version="1.0"?>
+<namelist_defaults>
+
+<!-- Set default output options for CMIP6 simulations -->
+<cosp_lite>.true.</cosp_lite>
+
+<!-- For comprehensive history -->
+<history_amwg>.true.</history_amwg>
+<history_aerosol>.true.</history_aerosol>
+<history_aero_optics>.true.</history_aero_optics>
+
+<!-- Solar constant from CMIP6 input4MIPS -->
+<solar_data_file>atm/cam/solar/Solar_1850-2299_input4MIPS_c20181106.nc</solar_data_file>
+<solar_data_type>SERIAL</solar_data_type>
+
+<!-- GHG values from CMIP6 input4MIPS -->
+<bndtvghg>atm/cam/ggas/GHG_CMIP-1-2-0_Annual_Global_0000-2014_c20180105.nc</bndtvghg>
+<scenario_ghg>RAMPED</scenario_ghg>
+
+<!-- External forcing for BAM or MAM.  CMIP6 input4mips data. SO2 file contains historical volcanic but 1850 for other sectors -->
+<!-- Need to use INTERP_MISSING_MONTHS for ext_frc_volc_type to go with ths updated SO2 file -->
+<ext_frc_volc_type    >INTERP_MISSING_MONTHS</ext_frc_volc_type>
+<ext_frc_type         >CYCLICAL</ext_frc_type>
+<ext_frc_cycle_yr     >1850</ext_frc_cycle_yr>
+<no2_ext_file         >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_NO2_aircraft_vertical_1750-2015_1.9x2.5_c20170608.nc </no2_ext_file>
+<so2_ext_file         >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_so2_elev_1850-2014_c180205_1850-aero_hist-volcano.nc </so2_ext_file>
+<soag0_ext_file	      >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/emissions-cmip6_e3sm_SOAG0_elev_1850-2014_1.9x2.5_c20230201.nc </soag0_ext_file>
+<bc_a4_ext_file       >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_bc_a4_elev_1850-2014_c180205.nc </bc_a4_ext_file>
+<mam7_num_a1_ext_file >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_num_a1_elev_1850-2014_c180205.nc </mam7_num_a1_ext_file>
+<num_a2_ext_file      >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_num_a2_elev_1850-2014_c180205.nc </num_a2_ext_file>
+<mam7_num_a3_ext_file >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_num_a4_elev_1850-2014_c180205.nc </mam7_num_a3_ext_file> <!-- This is to set num_a4 emissions -->
+<pom_a4_ext_file      >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_pom_a4_elev_1850-2014_c180205.nc </pom_a4_ext_file>
+<so4_a1_ext_file      >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_so4_a1_elev_1850-2014_c180205.nc </so4_a1_ext_file>
+<so4_a2_ext_file      >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_so4_a2_elev_1850-2014_c180205.nc </so4_a2_ext_file>
+
+<!-- Surface emissions for chemUCI-Linoz, MAM5, VBS SOA.  CMIP6 input4mips data -->
+<srf_emis_type        >CYCLICAL</srf_emis_type>
+<srf_emis_cycle_yr    >1850</srf_emis_cycle_yr>
+<c2h4_emis_file       >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_C2H4_surface_1850-2014_1.9x2.5_c20210323.nc </c2h4_emis_file>
+<c2h6_emis_file       >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_C2H6_surface_1850-2014_1.9x2.5_c20210323.nc </c2h6_emis_file>
+<c3h8_emis_file       >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_C3H8_surface_1850-2014_1.9x2.5_c20210323.nc </c3h8_emis_file>
+<ch2o_emis_file       >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_CH2O_surface_1850-2014_1.9x2.5_c20210323.nc </ch2o_emis_file>
+<ch3cho_emis_file     >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_CH3CHO_surface_1850-2014_1.9x2.5_c20210323.nc </ch3cho_emis_file>
+<ch3coch3_emis_file   >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_CH3COCH3_surface_1850-2014_1.9x2.5_c20210323.nc </ch3coch3_emis_file>
+<co_emis_file         >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_CO_surface_1850-2014_1.9x2.5_c20210323.nc </co_emis_file>
+<isop_emis_file       >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_ISOP_surface_1850-2014_1.9x2.5_c20210323.nc </isop_emis_file>
+<isop_vbs_emis_file   >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_ISOP_surface_1850-2014_1.9x2.5_c20210323.nc </isop_vbs_emis_file>
+<c10h16_emis_file     >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_MTERP_surface_1850-2014_1.9x2.5_c20230126.nc </c10h16_emis_file>
+<nox_emis_file        >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions-cmip6_e3sm_NO_surface_1850-2014_1.9x2.5_c20220425.nc </nox_emis_file>
+<dms_emis_file	      >atm/cam/chem/trop_mozart_aero/emis/DMSflux.1850.1deg_latlon_conserv.POPmonthlyClimFromACES4BGC_c20160416.nc </dms_emis_file>
+<soag0_emis_file      >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/emissions-cmip6_e3sm_SOAG0_surf_1850-2014_1.9x2.5_c20230201.nc </soag0_emis_file>
+<so2_emis_file	      >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_so2_surf_1850-2014_c180205.nc </so2_emis_file>
+<bc_a4_emis_file      >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_bc_a4_surf_1850-2014_c180205.nc </bc_a4_emis_file>
+<mam7_num_a1_emis_file>atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_num_a1_surf_1850-2014_c180205.nc </mam7_num_a1_emis_file> 
+<num_a2_emis_file     >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_num_a2_surf_1850-2014_c180205.nc </num_a2_emis_file>
+<mam7_num_a3_emis_file>atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_num_a4_surf_1850-2014_c180205.nc </mam7_num_a3_emis_file> <!-- This is to set num_a4 emissions -->
+<pom_a4_emis_file     >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_pom_a4_surf_1850-2014_c180205.nc </pom_a4_emis_file>
+<so4_a1_emis_file     >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_so4_a1_surf_1850-2014_c180205.nc </so4_a1_emis_file>
+<so4_a2_emis_file     >atm/cam/chem/trop_mozart_aero/emis/DECK_ne30/cmip6_mam4_so4_a2_surf_1850-2014_c180205.nc </so4_a2_emis_file>
+<e90_emis_file        >atm/cam/chem/trop_mozart_aero/emis/chem_gases/2degrees/emissions_E90_surface_1750-2015_1.9x2.5_c20210408.nc </e90_emis_file>
+
+<airpl_emis_file></airpl_emis_file>   <!-- need to be empty, but if specifying empty here, the value would be root of input_data_path -->
+
+<!-- Prescribed oxidants for aerosol chemistry.   Ozone is from CMIP6 input4MIPS file -->
+<tracer_cnst_type    >CYCLICAL</tracer_cnst_type>
+<tracer_cnst_cycle_yr>1849</tracer_cnst_cycle_yr>
+<tracer_cnst_file    >oxid_1.9x2.5_L26_1850-2015_c20181106.nc</tracer_cnst_file>
+<tracer_cnst_filelist>''</tracer_cnst_filelist>
+<tracer_cnst_datapath>atm/cam/chem/trop_mozart_aero/oxid</tracer_cnst_datapath>
+<tracer_cnst_specifier>'prsd_O3:O3','prsd_NO3:NO3','prsd_OH:OH'</tracer_cnst_specifier>
+
+<!-- prescribed methane  -->
+<prescribed_ghg_file      >ch4_oxid_1.9x2.5_L26_1990-1999clim.c090804.nc</prescribed_ghg_file>
+<prescribed_ghg_datapath  >atm/cam/chem/methane</prescribed_ghg_datapath>
+<prescribed_ghg_type      >CYCLICAL</prescribed_ghg_type>
+<prescribed_ghg_cycle_yr  >1995</prescribed_ghg_cycle_yr>
+<prescribed_ghg_filelist  >''</prescribed_ghg_filelist>
+<prescribed_ghg_specifier>'prsd_ch4:CH4'</prescribed_ghg_specifier>
+
+<!-- rad_climate -->
+<rad_climate>
+  'A:H2OLNZ:H2O', 'N:O2:O2', 'N:CO2:CO2',
+  'A:O3:O3', 'A:N2OLNZ:N2O', 'A:CH4LNZ:CH4',
+  'N:CFC11:CFC11', 'N:CFC12:CFC12',
+  'M:mam5_mode1:$INPUTDATA_ROOT/atm/cam/physprops/mam4_mode1_rrtmg_aeronetdust_c141106.nc',
+  'M:mam5_mode2:$INPUTDATA_ROOT/atm/cam/physprops/mam4_mode2_rrtmg_c130628.nc',
+  'M:mam5_mode3:$INPUTDATA_ROOT/atm/cam/physprops/mam4_mode3_rrtmg_aeronetdust_c141106.nc',
+  'M:mam5_mode4:$INPUTDATA_ROOT/atm/cam/physprops/mam4_mode4_rrtmg_c130628.nc',
+  'M:mam5_mode5:$INPUTDATA_ROOT/atm/cam/physprops/mam5_mode5_rrtmg_sig1.2_dgnl.40_c03072023.nc'
+</rad_climate>
+
+<!-- Marine organic aerosol namelist settings -->
+<mam_mom_mixing_state>3</mam_mom_mixing_state>
+<mam_mom_cycle_yr  >1                                                                                    </mam_mom_cycle_yr  >
+<mam_mom_datapath  >'atm/cam/chem/trop_mam/marine_BGC/'                                                  </mam_mom_datapath  >
+<mam_mom_datatype  >'CYCLICAL'										 </mam_mom_datatype  >
+<mam_mom_filename  >'monthly_macromolecules_0.1deg_bilinear_latlon_year01_merge_date.nc'                 </mam_mom_filename  > <!-- Using the 2000 file, for now -->
+<mam_mom_fixed_tod >0											 </mam_mom_fixed_tod >
+<mam_mom_fixed_ymd >0											 </mam_mom_fixed_ymd >
+<mam_mom_specifier >'chla:CHL1','mpoly:TRUEPOLYC','mprot:TRUEPROTC','mlip:TRUELIPC'			 </mam_mom_specifier >
+
+<chlorine_loading_file      >atm/cam/chem/trop_mozart/ub/Linoz_Chlorine_Loading_CMIP6_0003-2017_c20171114.nc</chlorine_loading_file>
+<chlorine_loading_type      >SERIAL</chlorine_loading_type>
+<linoz_data_file            >linv3_1849-2017_CMIP6_Hist_10deg_58km_c20230705.nc</linoz_data_file>
+<linoz_data_path            >atm/cam/chem/trop_mozart/ub</linoz_data_path>
+<linoz_data_type            >INTERP_MISSING_MONTHS</linoz_data_type>
+
+<!-- Set surface area density (SAD) variables -->
+<sad_type>SERIAL</sad_type>
+
+<!-- Turn off ozone dry deposition, as Linoz O3v2 and ozone are not separated for now. Need to turn on ozone dry deposition when interactive tropospheric chemistry is implemented -->
+<drydep_method       >'xactive_lnd'</drydep_method>
+<drydep_list         >'O3','H2O2','CH2O','CH3OOH','NO','NO2','HNO3','HO2NO2','PAN','CO','CH3COCH3','C2H5OOH','CH3CHO','H2SO4','SO2','NO3','N2O5','SOAG0','SOAG15','SOAG24','SOAG35','SOAG34','SOAG33','SOAG32','SOAG31'</drydep_list>
+<gas_wetdep_method   >'NEU'</gas_wetdep_method>
+<gas_wetdep_list     >'C2H5OOH','CH2O','CH3CHO','CH3OOH','H2O2','H2SO4','HNO3','HO2NO2','SO2','SOAG0','SOAG15','SOAG24','SOAG35','SOAG34','SOAG33','SOAG32','SOAG31'</gas_wetdep_list>
+<fstrat_efold_list>'CH2O', 'CH3O2', 'CH3OOH', 'PAN', 'CO', 'C2H6', 'C3H8', 'C2H4', 'ROHO2', 'CH3COCH3', 'C2H5O2', 'C2H5OOH', 'CH3CHO', 'CH3CO3', 'ISOP', 'ISOPO2', 'MVKMACR', 'MVKO2'</fstrat_efold_list>
+<fstrat_list         >''</fstrat_list>
+</namelist_defaults>
diff --git a/components/eam/cime_config/config_component.xml b/components/eam/cime_config/config_component.xml
index 1a961b84affe..d20a8c400cc1 100755
--- a/components/eam/cime_config/config_component.xml
+++ b/components/eam/cime_config/config_component.xml
@@ -51,9 +51,7 @@
 
       <value compset=""                        >-mach $MACH</value>
       <value compset="_EAM"                    >-phys default</value>
-      <value compset="_EAM%CMIP6-1pctCO2"      >&eamv3_phys_defaults; &eamv3_chem_defaults;</value>
-      <value compset="_EAM%CMIP6-4xCO2"        >&eamv3_phys_defaults; &eamv3_chem_defaults;</value>
-      <value compset="_EAM%CMIP6_"             >&eamv3_phys_defaults; &eamv3_chem_defaults;</value>
+      <value compset="_EAM%CMIP6.*"            >&eamv3_phys_defaults; &eamv3_chem_defaults;</value>
       <value compset="_ELM%[^_]*BC"            >-bc_dep_to_snow_updates</value>
       <value compset="_EAM.*_BGC%*"            >-co2_cycle</value>
 
@@ -125,6 +123,15 @@
       <value compset="1850(?:SOI)?_EAM.*AR5sf"          >1850_E3SMv1_superfast_ar5-emis</value>
       <value compset="1850S_EAM.*AR5sf"                 >1850S_E3SMv1_superfast_ar5-emis</value>
       <value compset="20TR(?:SOI)?_EAM.*CMIP6"          >20TR_eam_CMIP6_chemUCI-Linoz-mam5-vbs</value>
+      <value compset="20TR(?:SOI)?_EAM.*CMIP6"          >20TR_eam_CMIP6_chemUCI-Linoz-mam5-vbs</value>
+      <value compset="20TR(?:SOI)?_EAM.*CMIP6-GHG"      >20TR_eam_CMIP6-GHG_chemUCI-Linoz-mam5-vbs</value>
+      <value compset="20TR(?:SOI)?_EAM.*CMIP6-AER"      >20TR_eam_CMIP6-aer_chemUCI-Linoz-mam5-vbs</value>
+      <value compset="20TR(?:SOI)?_EAM.*CMIP6-NAT"      >20TR_eam_CMIP6-nat_chemUCI-Linoz-mam5-vbs</value>
+      <value compset="20TR(?:SOI)?_EAM.*CMIP6-xGHG-xAER">20TR_eam_CMIP6-xGHG-xaer_chemUCI-Linoz-mam5-vbs</value>
+      <value compset="20TR(?:SOI)?_EAM.*CMIP6-xAER"     >20TR_eam_CMIP6-xaer_chemUCI-Linoz-mam5-vbs</value>
+      <value compset="20TR(?:SOI)?_EAM.*CMIP6-OZONE"    >20TR_eam_CMIP6-ozone_chemUCI-Linoz-mam5-vbs</value>
+      <value compset="20TR(?:SOI)?_EAM.*CMIP6-LULC"     >20TR_eam_CMIP6-lulc_chemUCI-Linoz-mam5-vbs</value>
+      <value compset="20TR(?:SOI)?_EAM.*CMIP6-VOLC"     >20TR_eam_CMIP6-volc_chemUCI-Linoz-mam5-vbs</value>
       <value compset="20TR(?:SOI)?_EAM.*CMIP6.*_BGC*"   >20TR_eam_CMIP6_chemUCI-Linoz-mam5-vbs</value>
       <value compset="SSP585(?:SOI)?_EAM.*CMIP6"        >SSP585_eam_CMIP6_chemUCI-Linoz-mam5-vbs</value>
       <value compset="SSP370(?:SOI)?_EAM.*CMIP6"        >SSP370_eam_CMIP6_chemUCI-Linoz-mam5-vbs</value>
diff --git a/components/eam/cime_config/config_compsets.xml b/components/eam/cime_config/config_compsets.xml
index 39971fbb0945..7050bd0c8f90 100644
--- a/components/eam/cime_config/config_compsets.xml
+++ b/components/eam/cime_config/config_compsets.xml
@@ -272,12 +272,12 @@
   <!-- F compsets with transient SST (AMIP) -->
   <compset>
     <alias>F20TR-MMF1</alias>
-    <lname>20TR_EAM%CMIP6-MMF1_ELM%SP_MPASSI%PRES_DOCN%DOM_MOSART_SGLC_SWAV</lname>
+    <lname>20TR_EAM%MMF1_ELM%SP_MPASSI%PRES_DOCN%DOM_MOSART_SGLC_SWAV</lname>
   </compset>
 
   <compset>
     <alias>F20TR-MMF1</alias>
-    <lname>20TR_EAM%CMIP6-MMF2_ELM%SP_MPASSI%PRES_DOCN%DOM_MOSART_SGLC_SWAV</lname>
+    <lname>20TR_EAM%MMF2_ELM%SP_MPASSI%PRES_DOCN%DOM_MOSART_SGLC_SWAV</lname>
   </compset>
 
   <!-- ******************************* -->
diff --git a/components/elm/bld/namelist_files/use_cases/20thC_CMIP6xLULC_transient.xml b/components/elm/bld/namelist_files/use_cases/20thC_CMIP6xLULC_transient.xml
new file mode 100644
index 000000000000..7a6247bbe27f
--- /dev/null
+++ b/components/elm/bld/namelist_files/use_cases/20thC_CMIP6xLULC_transient.xml
@@ -0,0 +1,48 @@
+<?xml version="1.0"?>
+
+<namelist_defaults>
+
+<use_case_desc            >Historical single forcing simulation with land held at 1850 condition</use_case_desc>
+<use_case_desc bgc="cn"   >Simulate transient land-use, aerosol deposition, and Nitrogen deposition changes from 1850 to 2005</use_case_desc>
+<use_case_desc bgc="cndv" >Simulate transient land-use, aerosol deposition, and Nitrogen deposition changes from 1850 to 2005</use_case_desc>
+<use_case_desc use_cn=".true." >Simulate transient land-use, aerosol deposition, and Nitrogen deposition changes from 1850 to 2005</use_case_desc>
+
+<sim_year>1850</sim_year>
+
+<sim_year_range>1850-2000</sim_year_range>
+
+<clm_start_type>arb_ic</clm_start_type>
+
+
+<stream_year_first_ndep phys="elm" use_cn=".true."   >1850</stream_year_first_ndep>
+<stream_year_last_ndep  phys="elm" use_cn=".true."   >1850</stream_year_last_ndep>
+<model_year_align_ndep  phys="elm" use_cn=".true."   >1850</model_year_align_ndep>
+
+
+<stream_year_first_pdep phys="elm" use_cn=".true."   >2000</stream_year_first_pdep>
+<stream_year_last_pdep  phys="elm" use_cn=".true."   >2000</stream_year_last_pdep>
+<model_year_align_pdep  phys="elm" use_cn=".true."   >2000</model_year_align_pdep>
+
+<stream_year_first_popdens phys="elm" use_cn=".true."   >1850</stream_year_first_popdens>
+<stream_year_last_popdens  phys="elm" use_cn=".true."   >1850</stream_year_last_popdens>
+<model_year_align_popdens  phys="elm" use_cn=".true."   >1850</model_year_align_popdens>
+
+
+<!-- CMIP6 DECK compsets -->
+
+<fsurdat hgrid="ne30np4">lnd/clm2/surfdata_map/surfdata_ne30np4_simyr1850_2015_c171018.nc </fsurdat>
+<flanduse_timeseries hgrid="ne30np4">lnd/clm2/surfdata_map/landuse.timeseries_ne30np4_hist_simyr1850_2015_c20171018.nc</flanduse_timeseries>
+<finidat hgrid="ne30np4" mask="oEC60to30v3">lnd/clm2/initdata_map/20180316.DECKv1b_A1.ne30_oEC.edison.clm2.r.1980-01-01-00000.8575c3f_c20190904.nc</finidat>
+
+<fsurdat hgrid="r0125">lnd/clm2/surfdata_map/surfdata_0.125x0.125_simyr1850_c190730.nc</fsurdat>
+
+<fsurdat hgrid="r05">lnd/clm2/surfdata_map/surfdata_0.5x0.5_simyr1850_c200609_with_TOP.nc</fsurdat>
+
+<!-- Hack to override files for ne1024 for SCREAM, even though the sim years do not match up -->
+<fsurdat hgrid="ne1024np4.pg2">lnd/clm2/surfdata_map/surfdata_ne1024pg2_simyr2010_c211021.nc</fsurdat>
+
+<check_finidat_year_consistency>.false.</check_finidat_year_consistency>
+<check_dynpft_consistency>.false.</check_dynpft_consistency>
+
+
+</namelist_defaults>
diff --git a/components/elm/cime_config/config_component.xml b/components/elm/cime_config/config_component.xml
index da060584cfb8..4e637ef55802 100755
--- a/components/elm/cime_config/config_component.xml
+++ b/components/elm/cime_config/config_component.xml
@@ -72,7 +72,16 @@
       <value compset="1850(?:SOI)?_EAM%CMIP6_ELM.*_BGC%BCRC">1850_CMIP6bgc_control</value>
       <value compset="1850S_EAM%CMIP6_ELM">1850_SCMIP6_control</value>
       <value compset="1850S_EAM%CMIP6_ELM">1850_SCMIP6_control</value>
-      <value compset="20TR.*_EAM%.*CMIP6.*_ELM">20thC_CMIP6_transient</value>
+      <value compset="20TR.*_EAM%.*CMIP6_ELM">20thC_CMIP6_transient</value>
+      <value compset="20TR.*_EAM%.*CMIP6-GHG_ELM">20thC_CMIP6xLULC_transient</value>
+      <value compset="20TR.*_EAM%.*CMIP6-AER_ELM">20thC_CMIP6xLULC_transient</value>
+      <value compset="20TR.*_EAM%.*CMIP6-NAT_ELM">20thC_CMIP6xLULC_transient</value>
+      <value compset="20TR.*_EAM%.*CMIP6-OZONE_ELM">20thC_CMIP6xLULC_transient</value>
+      <value compset="20TR.*_EAM%.*CMIP6-VOLC_ELM">20thC_CMIP6xLULC_transient</value>
+      <value compset="20TR.*_EAM%.*CMIP6-xGHG-xAER_ELM">20thC_CMIP6_transient</value>
+      <value compset="20TR.*_EAM%.*CMIP6-xAER_ELM">20thC_CMIP6_transient</value>
+      <value compset="20TR.*_EAM%.*CMIP6-LULC_ELM">20thC_CMIP6_transient</value>
+      <value compset="20TR.*_EAM%MMF.*_ELM">20thC_CMIP6_transient</value>
       <value compset="20TR_EAM%CMIP6_ELM.*_BGC%LNDATM">20thC_CMIP6bgc_transient</value> 
       <value compset="20TR(?:SOI)?_EAM%CMIP6_ELM*_BGC%B">20thC_CMIP6bgc_transient</value> 
       <value compset="20TR.*_ELM%[^_]*BGC">20thC_bgc_transient</value>
diff --git a/docs/user-guide/index.md b/docs/user-guide/index.md
index c2daf519a42d..53fa28d64e25 100644
--- a/docs/user-guide/index.md
+++ b/docs/user-guide/index.md
@@ -24,7 +24,7 @@ is available.
 
 A *fully coupled* compset is one which has active components for at least the atmosphere, ocean, land surface, ocean and
 sea-ice all interacting.  Each compset is associated with a specific forcing condition.
-Coupled compsets in E3SM are developed  for three science-driven simulation campaigns:  `water cycle change and impacts`, `human-earth system feedbacks`, and `polar processes, sea-level rise and coastal impacts`. The standard coupled configurations -- which consist of prognostic atmosphere, land, river, ocean and sea-ice components -- form the base physical coupled system and are mainly designed for `water cycle change and impacts` simulation campaign.
+Coupled compsets in E3SM are developed  for three science-driven simulation campaigns:  **water cycle change and impacts**, **human-earth system feedbacks**, and **polar processes, sea-level rise and coastal impacts**. The standard coupled configurations -- which consist of prognostic atmosphere, land, river, ocean and sea-ice components -- form the base physical coupled system and are mainly designed for `water cycle change and impacts` simulation campaign.
 Below list the standard configuration compsets supported in the current version of E3SM:
 
 |Compset alias | Description |
@@ -37,6 +37,35 @@ Below list the standard configuration compsets supported in the current version
 |`WCYCLSSP245` | Standard configuration with prescribed SSP-245 forcings |
 |`WCYCLSSP370` | Standard configuration with prescribed SSP-370 forcings |
 |`WCYCLSSP585` | Standard configuration with prescribed SSP-585 forcings |
+| | **Compsets for single-forcings simulations of the historical period (1850-2014)** |
+|`WCYCL20TR-GHG` | Greenhouse gases only configuration (`GHGs`)|
+|`WCYCL20TR-aer` | Anthropogenic aerosols and precursors only configuration (`aer`)|
+|`WCYCL20TR-xGHG-xaer` | All forcings except GHGs and aer (`solar irradiance, stratospheric ozone and volcanic emissions, land use land cover`) |
+|`WCYCL20TR-xaer` | All forcings except aer (`GHGs, solar irradiance, stratospheric ozone and volcanic emissions, land use land cover`) |
+|`WCYCL20TR-nat` | Natural-only configuration (`solar irradiance, stratospheric volcanic emissions, land use land cover`) |
+|`WCYCL20TR-ozone` | Stratospheric ozone only configuration |
+|`WCYCL20TR-lulc` | Land use land cover only configuration |
+|`WCYCL20TR-volc` | Stratospheric volcanic emissions only configuration |
+
+The table below specifies which forcing category is fixed at 1850 conditions and which are allowed to vary over the historical period
+for each of the historical ("20TR") compsets including the single-forcing compsets.
+
+|Compset alias  |  GHGs    | Aerosol & precursors | Oxidants | Ozone (CI & Linoz) | Volcano | Solar   |  Land Use & ndep/popdensa |
+|:------------  |:-----:   | :---:                | :---:    | :---:              | :---:   | :---:   | :---:   |
+|`WCYCL20TR`    | varying       | varying         | varying  | varying            | varying | varying | varying |
+|`WCYCL20TR-GHG`| varying       | 1850            | 1850     | 1850               | 1850    | 1850    | 1850    |
+|`WCYCL20TR-aer`| 1850          | varying         | varying  | 1850               | 1850    | 1850    | 1850    |
+|`WCYCL20TR-xGHG-xaer`| 1850    | 1850            | 1850     | varying            | varying | varying | varying |
+|`WCYCL20TR-xaer`| varying      | 1850            | 1850     | varying            | varying | varying | varying |
+|`WCYCL20TR-nat`| 1850          | 1850            | 1850     | 1850               | varying | varying | 1850    |
+|`WCYCL20TR-ozone`| 1850        | 1850            | 1850     | varying            | 1850    | 1850    | 1850    |
+|`WCYCL20TR-lulc`| 1850         | 1850            | 1850     | 1850               | 1850    | 1850    | varying |
+|`WCYCL20TR-volc`| 1850         | 1850            | 1850     | 1850               | varying | 1850    | 1850    |
+
+<!-- markdownlint-disable-next-line MD033 -->
+- <sub> *Volcano* refers to stratospheric volcanic SO2 emissions; *1850* for *Volcano* refers to background (average) stratospheric volcanic emissions used in pre-industrial control experiments</sub>
+<!-- markdownlint-disable-next-line MD033 -->
+- <sub> *Oxidants* always follow *Aerosol & precursors* for fixed or varying.</sub>
 
 The compsets for the other two science simulation campaigns are being finalized, with additional components and/or features.
 The compset naming follows the same convention, e.g., `CRYO1850` and `CRYO1850-4xCO2` are with prognostic ice-shelf melt fluxes for the `polar processes` simulation campaign.
diff --git a/driver-mct/cime_config/config_component_e3sm.xml b/driver-mct/cime_config/config_component_e3sm.xml
index 08758f935313..feaa8f270a1b 100755
--- a/driver-mct/cime_config/config_component_e3sm.xml
+++ b/driver-mct/cime_config/config_component_e3sm.xml
@@ -753,6 +753,12 @@
       <value compset="^1950.+CMIP6"                             >312.821</value>
       <value compset="^2010"                                    >388.717</value>
       <value compset="^2010.+CMIP6"                             >388.717</value>
+      <value compset="^20TR.+CMIP6-AER"                         >284.317</value>
+      <value compset="^20TR.+CMIP6-xGHG-xAER"                   >284.317</value>
+      <value compset="^20TR.+CMIP6-NAT"                         >284.317</value>
+      <value compset="^20TR.+CMIP6-OZONE"                       >284.317</value>
+      <value compset="^20TR.+CMIP6-LULC"                        >284.317</value>
+      <value compset="^20TR.+CMIP6-VOLC"                        >284.317</value>
       <value compset="^SSP585.+CMIP6"				>0.000001</value>
       <value compset="^SSP370.+CMIP6"                           >0.000001</value>
       <value compset="^20TR.*BGC%BCRC"                          >284.317</value>
@@ -857,6 +863,7 @@
     <default_value>1</default_value>
     <values match="last">
       <value compset=".+EAM%CMIP6"				>2</value>
+      <value compset=".+EAM%MMF"				>2</value>
     </values>
     <group>shr_dust_nl</group>
     <file>env_run.xml</file>