diff --git a/bld/CLMBuildNamelist.pm b/bld/CLMBuildNamelist.pm
index 4d4522a4cd..2c356cc9e9 100755
--- a/bld/CLMBuildNamelist.pm
+++ b/bld/CLMBuildNamelist.pm
@@ -1581,6 +1581,7 @@ sub process_namelist_inline_logic {
   setup_logic_luna($opts, $nl_flags, $definition, $defaults, $nl, $physv);
   setup_logic_hillslope($opts, $nl_flags, $definition, $defaults, $nl);
   setup_logic_o3_veg_stress_method($opts, $nl_flags, $definition, $defaults, $nl,$physv);
+  setup_logic_do3_streams($opts, $nl_flags, $definition, $defaults, $nl, $physv);
   setup_logic_hydrstress($opts,  $nl_flags, $definition, $defaults, $nl);
   setup_logic_dynamic_roots($opts,  $nl_flags, $definition, $defaults, $nl, $physv);
   setup_logic_params_file($opts,  $nl_flags, $definition, $defaults, $nl);
diff --git a/bld/namelist_files/namelist_defaults_ctsm.xml b/bld/namelist_files/namelist_defaults_ctsm.xml
index 6f07fc0ffe..2bced86626 100644
--- a/bld/namelist_files/namelist_defaults_ctsm.xml
+++ b/bld/namelist_files/namelist_defaults_ctsm.xml
@@ -1733,8 +1733,8 @@ lnd/clm2/surfdata_esmf/NEON/surfdata_1x1_NEON_TOOL_hist_78pfts_CMIP6_simyr2000_c
 <!-- do3 streams namelist defaults -->
 <use_do3_streams>.false.</use_do3_streams>
 
-<stream_fldfilename_do3>/glade/work/afoster/ozone_damage_files/converted/diurnal_factor_O3surface_ssp370_2015-2024_c20220502.nc</stream_fldfilename_do3>
-<stream_meshfile_do3>$DIN_LOC_ROOT/share/meshes/fv0.9x1.25_141008_polemod_ESMFmesh.nc</stream_meshfile_do3>
+<stream_fldfilename_do3>/glade/work/afoster/ozone_update/ozone_damage_files/converted/diurnal_factor_O3surface_ssp370_2015-2024_c20220502.nc</stream_fldfilename_do3>
+<stream_meshfile_do3>share/meshes/fv0.9x1.25_141008_polemod_ESMFmesh.nc</stream_meshfile_do3>
 <do3_mapalgo>bilinear</do3_mapalgo>
 
 <!-- crop calendar streams namelist defaults -->
diff --git a/src/biogeophys/DiurnalOzoneType.F90 b/src/biogeophys/DiurnalOzoneType.F90
index 88f83426e0..7d332c241f 100644
--- a/src/biogeophys/DiurnalOzoneType.F90
+++ b/src/biogeophys/DiurnalOzoneType.F90
@@ -92,32 +92,32 @@ end subroutine InitAllocate
   !-----------------------------------------------------------------------
 
   !-----------------------------------------------------------------------
-  subroutine Interp(this, forc_o3, forc_o3_down)
+  subroutine Interp(this, bounds, forc_o3, forc_o3_down)
     !
     ! !DESCRIPTION:
     ! Downscale/interpolate multi-day ozone data to subdaily
     !
     ! !USES:
-    use clm_time_manager , only : get_curr_time
+    use clm_time_manager , only : get_curr_date
     use clm_varcon       , only : secspday
     !
     ! !ARGUMENTS:
     class(diurnal_ozone_anom_type), intent(in)  :: this
-    real(r8),                       intent(in)  :: forc_o3(bounds%begg:bounds%endg)      ! ozone partial pressure (mol/mol)
-    real(r8),                       intent(out) :: forc_o3_down(bounds%begg:bounds%endg) ! ozone partial pressure, downscaled (mol/mol)
+    type(bounds_type),              intent(in)  :: bounds          ! bounds type
+    real(r8),                       intent(in)  :: forc_o3(:)      ! ozone partial pressure (mol/mol)
+    real(r8),                       intent(out) :: forc_o3_down(:) ! ozone partial pressure, downscaled (mol/mol)
+
     !
     ! LOCAL VARIABLES:
-    integer :: t               ! looping index
-    integer :: yr              ! year
-    integer :: mon             ! month
+    integer  :: t               ! looping index
+    integer  :: yr              ! year
+    integer  :: mon             ! month
     integer  :: day            ! day of month
     integer  :: tod            ! time of day (seconds past 0Z)
     integer  :: begg, endg     ! bounds
     integer  :: t_prev         ! previous time index
-    real(r8) :: anomaly_val_start
-    real(r8) :: anomaly_val_end
-    real(r8) :: anomaly_scalar
-    real(r8) :: tdiff_end, tdiff_start
+    real(r8) :: tdiff_end
+    real(r8) :: tdiff_start
     real(r8) :: tdiff
     !-----------------------------------------------------------------------
 
@@ -135,6 +135,7 @@ subroutine Interp(this, forc_o3, forc_o3_down)
 
     ! interpolate, checking for edge cases
     if (t == 1) then
+      ! wrap around back
       t_prev = this%ntimes
       tdiff_end = secspday - this%time_arr(t_prev) + real(tod)
       tdiff = this%time_arr(t) + secspday - this%time_arr(t_prev)
@@ -144,14 +145,12 @@ subroutine Interp(this, forc_o3, forc_o3_down)
       tdiff = this%time_arr(t) - this%time_arr(t_prev)
     end if
 
-    anomaly_val_start = this%o3_anomaly_grc(begg:endg, t_prev)
-    anomaly_val_end = this%o3_anomaly_grc(begg:endg, t)
     tdiff_start = this%time_arr(t) - real(tod)
 
     ! interpolate
-    anomaly_scalar = (anomaly_val_start*tdiff_start + anomaly_val_end*tdiff_end)/tdiff
-
-    forc_o3_down(begg:endg) = forc_o3(begg:endg)*anomaly_scalar
+    forc_o3_down(begg:endg) = forc_o3(begg:endg)*               &
+      ((this%o3_anomaly_grc(begg:endg, t_prev)*tdiff_start +    &
+      this%o3_anomaly_grc(begg:endg, t_prev)*tdiff_end)/tdiff)
 
     end subroutine Interp
 
diff --git a/src/biogeophys/OzoneMod.F90 b/src/biogeophys/OzoneMod.F90
index 73622117de..5c799aae7f 100644
--- a/src/biogeophys/OzoneMod.F90
+++ b/src/biogeophys/OzoneMod.F90
@@ -419,7 +419,7 @@ subroutine CalcOzoneUptake(this, bounds, num_exposedvegp, filter_exposedvegp, &
          )
 
     if (this%atm_ozone_freq == atm_ozone_frequency_multiday_average) then
-      call this%diurnalOzoneAnomInst%Interp(forc_o3, forc_o3_down)
+      call this%diurnalOzoneAnomInst%Interp(bounds, forc_o3, forc_o3_down)
     else
       forc_o3_down(bounds%begg:bounds%endg) = forc_o3(bounds%begg:bounds%endg)
     end if
diff --git a/src/cpl/nuopc/lnd_import_export.F90 b/src/cpl/nuopc/lnd_import_export.F90
index 647d468960..30c9f6eec3 100644
--- a/src/cpl/nuopc/lnd_import_export.F90
+++ b/src/cpl/nuopc/lnd_import_export.F90
@@ -22,7 +22,6 @@ module lnd_import_export
   use shr_megan_mod           , only : shr_megan_readnl, shr_megan_mechcomps_n
   use nuopc_shr_methods       , only : chkerr
   use lnd_import_export_utils , only : check_for_errors, check_for_nans
-  use diurnalOzoneStreamMod   , only : dO3_init
 
   implicit none
   private ! except
@@ -1331,7 +1330,7 @@ subroutine ReadCapNamelist( NLFilename, rc )
     integer, target    :: tmp(1)
     type(ESMF_VM)      :: vm
     character(*), parameter :: nml_name = "ctsm_nuopc_cap" ! MUST match with namelist name below
-    
+
 
     namelist  /ctsm_nuopc_cap/ force_send_to_atm
 
@@ -1356,7 +1355,7 @@ subroutine ReadCapNamelist( NLFilename, rc )
 
     ! Broadcast namelist to all processors
     call ESMF_VMBroadcast(vm, tmp, 1, 0, rc=rc)
-   
+
     force_send_to_atm = (tmp(1) == 1)
     if (ChkErr(rc,__LINE__,u_FILE_u)) return
 
diff --git a/src/main/clm_varctl.F90 b/src/main/clm_varctl.F90
index 7d0b2b55ad..82f4cdb40b 100644
--- a/src/main/clm_varctl.F90
+++ b/src/main/clm_varctl.F90
@@ -27,27 +27,27 @@ module clm_varctl
   ! Run control variables
   !
   ! case id
-  character(len=256), public :: caseid  = ' '                            
+  character(len=256), public :: caseid  = ' '
 
   ! case title
-  character(len=256), public :: ctitle  = ' '                            
+  character(len=256), public :: ctitle  = ' '
 
   ! Type of run
-  integer, public :: nsrest                = iundef                         
+  integer, public :: nsrest                = iundef
   logical, public :: is_cold_start         = .false.
 
   ! Startup from initial conditions
-  integer, public, parameter :: nsrStartup  = 0                          
+  integer, public, parameter :: nsrStartup  = 0
 
   ! Continue from restart files
-  integer, public, parameter :: nsrContinue = 1                          
+  integer, public, parameter :: nsrContinue = 1
 
   ! Branch from restart files
-  integer, public, parameter :: nsrBranch   = 2                          
+  integer, public, parameter :: nsrBranch   = 2
 
   ! true => allow case name to remain the same for branch run
   ! by default this is not allowed
-  logical, public :: brnch_retain_casename = .false.                     
+  logical, public :: brnch_retain_casename = .false.
 
   ! true => run tests of ncdio_pio
   logical, public :: for_testing_run_ncdiopio_tests = .false.
@@ -74,19 +74,19 @@ module clm_varctl
   logical, public :: for_testing_no_crop_seed_replenishment = .false.
 
   ! Hostname of machine running on
-  character(len=256), public :: hostname = ' '                           
+  character(len=256), public :: hostname = ' '
 
   ! username of user running program
-  character(len=256), public :: username = ' '                           
+  character(len=256), public :: username = ' '
 
   ! description of this source
   character(len=256), public :: source   = "Community Terrestrial Systems Model"
 
   ! version of program
-  character(len=256), public :: version  = " "                           
+  character(len=256), public :: version  = " "
 
   ! dataset conventions
-  character(len=256), public :: conventions = "CF-1.0"                   
+  character(len=256), public :: conventions = "CF-1.0"
 
   ! component name for filenames (history or restart files)
   character(len=8), public :: compname = 'clm2'
@@ -120,14 +120,14 @@ module clm_varctl
   !----------------------------------------------------------
   ! Flag to read ndep rather than obtain it from coupler
   !----------------------------------------------------------
-  
+
   logical, public :: ndep_from_cpl = .false.
 
   !----------------------------------------------------------
   ! Interpolation of finidat if requested
   !----------------------------------------------------------
 
-  logical, public :: bound_h2osoi = .true. ! for debugging 
+  logical, public :: bound_h2osoi = .true. ! for debugging
 
   ! If finidat_interp_source is non-blank and finidat is blank then interpolation will be
   ! done from finidat_interp_source to finidat_interp_dest. Note that
@@ -150,8 +150,8 @@ module clm_varctl
   logical, public, parameter :: use_crop_agsys = .false.
 
   ! true => separate crop landunit is not created by default
-  logical, public :: create_crop_landunit = .false.     
-  
+  logical, public :: create_crop_landunit = .false.
+
   ! number of hillslopes per landunit
   integer, public :: nhillslope = 0
 
@@ -159,14 +159,14 @@ module clm_varctl
   integer, public :: max_columns_hillslope = 1
 
   ! do not irrigate by default
-  logical, public :: irrigate = .false.            
+  logical, public :: irrigate = .false.
 
   ! set saturated excess runoff to zero for crops
   logical, public :: crop_fsat_equals_zero = .false.
 
   ! remove this fraction of crop residues to a 1-year product pool (instead of going to litter)
   real(r8), public :: crop_residue_removal_frac = 0.0
-  
+
   !----------------------------------------------------------
   ! Other subgrid logic
   !----------------------------------------------------------
@@ -175,7 +175,7 @@ module clm_varctl
   logical, public :: run_zero_weight_urban = .false.
 
   ! true => make ALL patches, cols & landunits active (even if weight is 0)
-  logical, public :: all_active = .false.          
+  logical, public :: all_active = .false.
 
   ! true => any ocean (i.e., "wetland") points on the surface dataset are converted to
   ! bare ground (or whatever vegetation is given in that grid cell... but typically this
@@ -198,33 +198,33 @@ module clm_varctl
   !----------------------------------------------------------
 
   ! values of 'prognostic','diagnostic','constant'
-  character(len=16), public :: co2_type = 'constant'    
+  character(len=16), public :: co2_type = 'constant'
 
-  ! State of the model for the accelerated decomposition (AD) spinup. 
+  ! State of the model for the accelerated decomposition (AD) spinup.
   ! 0 (default) = normal model; 1 = AD SPINUP
-  integer, public :: spinup_state = 0 
+  integer, public :: spinup_state = 0
 
   ! true => anoxia is applied to heterotrophic respiration also considered in CH4 model
   ! default value reset in controlMod
-  logical, public :: anoxia  = .true. 
+  logical, public :: anoxia  = .true.
 
   ! used to override an error check on reading in restart files
-  logical, public :: override_bgc_restart_mismatch_dump = .false. 
+  logical, public :: override_bgc_restart_mismatch_dump = .false.
 
   ! Set in CNAllocationInit (TODO - had to move it here to avoid circular dependency)
-  logical, private:: carbon_only      
+  logical, private:: carbon_only
 
-  ! Set in CNNDynamicsInit 
+  ! Set in CNNDynamicsInit
   ! NOTE (mvertens, 2014-9 had to move it here to avoid confusion when carbon data types
-  ! wehre split - TODO - should move it our of this module) 
+  ! wehre split - TODO - should move it our of this module)
   ! NOTE(bandre, 2013-10) according to Charlie Koven, nfix_timeconst
-  ! is currently used as a flag and rate constant. 
+  ! is currently used as a flag and rate constant.
   ! Rate constant: time over which to exponentially relax the npp flux for N fixation term
   ! (days) time over which to exponentially relax the npp flux for N fixation term
-  ! flag: (if  <=  0. or  >=  365; use old annual method). 
+  ! flag: (if  <=  0. or  >=  365; use old annual method).
   ! Default value is junk that should always be overwritten by the namelist or init function!
   !
-  real(r8), public :: nfix_timeconst = -1.2345_r8 
+  real(r8), public :: nfix_timeconst = -1.2345_r8
 
   !----------------------------------------------------------
   ! Physics
@@ -244,10 +244,16 @@ module clm_varctl
   ! ozone vegitation stress method, valid values: unset, stress_lombardozzi2015, stress_falk
   character(len=64), public    :: o3_veg_stress_method = 'unset'
 
+  ! other o3_streams parameters
+  logical, public :: use_do3_streams = .false.
+  character(len=fname_len), public :: stream_fldfilename_do3
+  character(len=fname_len), public :: stream_meshfile_do3
+  character(len=fname_len), public :: do3_mapalgo
+
   real(r8), public  :: o3_ppbv = 100._r8
 
   ! number of wavelength bands used in SNICAR snow albedo calculation
-  integer, public :: snicar_numrad_snw = 5 
+  integer, public :: snicar_numrad_snw = 5
 
   ! type of downward solar radiation spectrum for SNICAR snow albedo calculation
   ! options:
@@ -316,7 +322,7 @@ module clm_varctl
   integer, public            :: fates_parteh_mode = -9                  ! 1 => carbon only
                                                                         ! 2 => C+N+P (not enabled yet)
                                                                         ! no others enabled
-  integer, public            :: fates_spitfire_mode = 0                
+  integer, public            :: fates_spitfire_mode = 0
                                                                         ! 0 for no fire; 1 for constant ignitions;
                                                                         ! > 1 for external data (lightning and/or anthropogenic ignitions)
                                                                         ! see bld/namelist_files/namelist_definition_clm4_5.xml for details
@@ -336,13 +342,13 @@ module clm_varctl
   ! Performing this output can be expensive, so we allow different history dimension
   ! levels.
   ! The first index is output at the model timescale
-  ! The second index is output at the dynamics (daily) timescale      
+  ! The second index is output at the dynamics (daily) timescale
   ! 0 - no output
   ! 1 - include only column level means (3D)
   ! 2 - include output that includes the 4th dimension
-  
+
   integer, dimension(2), public   :: fates_history_dimlevel = (/2,2/)
-  
+
   logical, public            :: use_fates_luh = .false.                 ! true => use FATES landuse data mode
   character(len=256), public :: fluh_timeseries = ''                    ! filename for fates landuse timeseries data
   character(len=256), public :: fates_inventory_ctrl_filename = ''      ! filename for inventory control
@@ -351,9 +357,9 @@ module clm_varctl
   ! BUT... THEY CAN BOTH BE OFF (IF FATES IS OFF)
   logical, public            :: use_fates_sp = .false.                  ! true => use FATES satellite phenology mode
   logical, public            :: use_fates_bgc = .false.                 ! true => use FATES along with CLM soil biogeochemistry
-  
+
   !----------------------------------------------------------
-  !  LUNA switches		
+  !  LUNA switches
   !----------------------------------------------------------
 
   logical, public :: use_luna = .false.            ! true => use  LUNA
@@ -373,7 +379,7 @@ module clm_varctl
   integer, public :: carbon_resp_opt = 0
 
   !----------------------------------------------------------
-  ! prescribed soil moisture streams switch 
+  ! prescribed soil moisture streams switch
   !----------------------------------------------------------
 
   logical, public :: use_soil_moisture_streams = .false. ! true => use prescribed soil moisture stream
@@ -436,11 +442,11 @@ module clm_varctl
   ! glacier_mec control variables: default values (may be overwritten by namelist)
   !----------------------------------------------------------
 
-  ! true => CLM glacier area & topography changes dynamically 
-  logical , public :: glc_do_dynglacier = .false.           
+  ! true => CLM glacier area & topography changes dynamically
+  logical , public :: glc_do_dynglacier = .false.
 
   ! number of days before one considers the perennially snow-covered point 'land ice'
-  integer , public :: glc_snow_persistence_max_days = 7300  
+  integer , public :: glc_snow_persistence_max_days = 7300
 
   !
   !----------------------------------------------------------
@@ -464,21 +470,21 @@ module clm_varctl
   !----------------------------------------------------------
 
   ! number of segments per clump for decomp
-  integer, public :: nsegspc = 20                       
+  integer, public :: nsegspc = 20
 
   !----------------------------------------------------------
   ! Derived variables (run, history and restart file)
   !----------------------------------------------------------
 
   ! directory name for local restart pointer file
-  character(len=256), public :: rpntdir = '.'            
+  character(len=256), public :: rpntdir = '.'
 
   ! file name for local restart pointer file
-  character(len=256), public :: rpntfil = 'rpointer.lnd' 
+  character(len=256), public :: rpntfil = 'rpointer.lnd'
 
   ! moved hist_wrtch4diag from histFileMod.F90 to here - caused compiler error with intel
   ! namelist: write CH4 extra diagnostic output
-  logical, public :: hist_wrtch4diag = .false.         
+  logical, public :: hist_wrtch4diag = .false.
 
   ! namelist: write list of all history fields to a file for use in documentation
   logical, public :: hist_fields_list_file = .false.
@@ -532,7 +538,7 @@ subroutine clm_varctl_set( caseid_in, ctitle_in, brnch_retain_casename_in,    &
     ! !ARGUMENTS:
     character(len=256), optional, intent(IN) :: caseid_in                ! case id
     character(len=256), optional, intent(IN) :: ctitle_in                ! case title
-    logical,            optional, intent(IN) :: brnch_retain_casename_in ! true => allow case name to remain the 
+    logical,            optional, intent(IN) :: brnch_retain_casename_in ! true => allow case name to remain the
                                                                          ! same for branch run
     logical,            optional, intent(IN) :: single_column_in         ! true => single column mode
     real(r8),           optional, intent(IN) :: scmlat_in                ! single column lat
diff --git a/src/main/controlMod.F90 b/src/main/controlMod.F90
index 46d9e9958a..fb61a0a958 100644
--- a/src/main/controlMod.F90
+++ b/src/main/controlMod.F90
@@ -244,8 +244,9 @@ subroutine control_init(dtime)
           use_fates_tree_damage,                        &
           fates_history_dimlevel
 
-    ! Ozone vegetation stress method
-    namelist / clm_inparm / o3_veg_stress_method
+    ! Ozone vegetation stress method and streams file
+    namelist / clm_inparm / o3_veg_stress_method, use_do3_streams,                       &
+      stream_fldfilename_do3, stream_meshfile_do3, do3_mapalgo
 
     ! CLM 5.0 nitrogen flags
     namelist /clm_inparm/ use_flexibleCN, use_luna
@@ -465,7 +466,7 @@ subroutine control_init(dtime)
           else
              use_fates_bgc = .true.
           end if
-          
+
           if (fates_parteh_mode == 1 .and. suplnitro == suplnNon .and. use_fates_bgc )then
              write(iulog,*) ' When FATES with fates_parteh_mode == 1 (ie carbon only mode),'
              write(iulog,*) '  you must have supplemental nitrogen turned on, there will be'
@@ -474,7 +475,7 @@ subroutine control_init(dtime)
              call endrun(msg=' ERROR: fates_parteh_mode=1 must have suplnitro set to suplnAll.'//&
                    errMsg(sourcefile, __LINE__))
           end if
-          
+
           if ( use_cn) then
              call endrun(msg=' ERROR: use_cn and use_fates cannot both be set to true.'//&
                    errMsg(sourcefile, __LINE__))
@@ -506,21 +507,21 @@ subroutine control_init(dtime)
           end if
 
        else
-          
+
           ! These do default to false anyway, but this emphasizes they
           ! are false when fates is false
           use_fates_sp  = .false.
           use_fates_bgc = .false.
-          
+
        end if
 
        ! Check compatibility with use_lai_streams
        if (use_lai_streams) then
-        if ((use_fates .and. .not. use_fates_sp) .or. use_cn) then 
+        if ((use_fates .and. .not. use_fates_sp) .or. use_cn) then
           call endrun(msg=' ERROR: cannot use LAI streams unless in SP mode (use_cn = .false. or use_fates_sp=.true.).'//&
                   errMsg(sourcefile, __LINE__))
-        end if 
-       end if 
+        end if
+       end if
 
        ! If nfix_timeconst is equal to the junk default value, then it was not specified
        ! by the user namelist and we need to assign it the correct default value. If the
@@ -774,7 +775,7 @@ subroutine control_spmd()
 
     ! BGC
     call mpi_bcast (co2_type, len(co2_type), MPI_CHARACTER, 0, mpicom, ier)
-    
+
     call mpi_bcast (use_fates, 1, MPI_LOGICAL, 0, mpicom, ier)
 
     if (use_cn .or. use_fates) then
@@ -987,6 +988,10 @@ subroutine control_print ()
     write(iulog,*) '    use_grainproduct = ', use_grainproduct
     write(iulog,*) '    crop_residue_removal_frac = ', crop_residue_removal_frac
     write(iulog,*) '    o3_veg_stress_method = ', o3_veg_stress_method
+    write(iulog,*) '    use_do3_streams = ', use_do3_streams
+    write(iulog,*) '    stream_fldfilename_do3 = ', stream_fldfilename_do3
+    write(iulog,*) '    stream_meshfile_do3 = ', stream_meshfile_do3
+    write(iulog,*) '    do3_mapalgo = ', do3_mapalgo
     write(iulog,*) '    use_snicar_frc = ', use_snicar_frc
     write(iulog,*) '    snicar_use_aerosol = ',snicar_use_aerosol
     write(iulog,*) '    use_vancouver = ', use_vancouver