diff --git a/.github/workflows/validate_yaml_files.yml b/.github/workflows/validate_yaml_files.yml
index ff19b0d6..dfefbd9a 100644
--- a/.github/workflows/validate_yaml_files.yml
+++ b/.github/workflows/validate_yaml_files.yml
@@ -24,7 +24,7 @@ jobs:
           format: colored
           config_file: .yamllint.yml
 
-      - uses: actions/upload-artifact@v2
+      - uses: actions/upload-artifact@v4
         if: always()
         with:
           name: yamllint-logfile
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 975fc501..4c0e7eb2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -14,6 +14,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Changed
 
 - Modified the file paths in carbon, sulfate, and nitrate ExtData.yaml files to used the revised version of the CEDS anthropogenic emissions. Note the previous version has an incorrect seasonal cycle.
+- Sulfate surface area density calculation in SU_Compute_Diags was incorrectly being passed the effective radius used for settling along with the sigma width of the number distribution. Properly it should be passed the number median radius, also present in the RC file. Added a hook to read that field from the RC file ("particle_radius_number"), store in SU grid comp, and pass to SU_Compute_Diags. This change is zero-diff to the SU internal state. It changes value of export SO4AREA.
+- Changed DMS concentration data holder from ExtData provided (SU_DMSO) to local copy (dmso_conc). This is relevant since if we run source tagged instances where we don't want DMS emissions we would zero out dmso_conc and that is what should be passed to DMSemission subroutine. This is zero diff except in that case.
 
 ### Fixed
 
diff --git a/ESMF/GOCART2G_GridComp/SU2G_GridComp/SU2G_GridCompMod.F90 b/ESMF/GOCART2G_GridComp/SU2G_GridComp/SU2G_GridCompMod.F90
index e8a6ea69..b5739d5a 100644
--- a/ESMF/GOCART2G_GridComp/SU2G_GridComp/SU2G_GridCompMod.F90
+++ b/ESMF/GOCART2G_GridComp/SU2G_GridComp/SU2G_GridCompMod.F90
@@ -96,6 +96,7 @@ module SU2G_GridCompMod
       real    :: aviation_layers(4)  ! heights of the LTO, CDS and CRS layers
       real    :: fSO4anth  ! Fraction of anthropogenic emissions that are SO4
       !logical :: firstRun = .true.
+      real, allocatable  :: rmed(:)  ! Median radius of lognormal number distribution
       real, allocatable  :: sigma(:) ! Sigma of lognormal number distribution
       !real, pointer :: h2o2_init(:,:,:)
 
@@ -187,6 +188,7 @@ subroutine SetServices ( GC, RC )
 !   process generic config items
     call self%GA_Environment%load_from_config( cfg, universal_cfg, __RC__)
 
+    allocate(self%rmed(self%nbins), __STAT__)
     allocate(self%sigma(self%nbins), __STAT__)
 
 !   process SU-specific items
@@ -194,6 +196,7 @@ subroutine SetServices ( GC, RC )
     call ESMF_ConfigGetAttribute(cfg, self%volcano_srcfilen_explosive, label='volcano_srcfilen_explosive:', __RC__)
     call ESMF_ConfigGetAttribute(cfg, self%eAircraftFuel, label='aircraft_fuel_emission_factor:', __RC__)
     call ESMF_ConfigGetAttribute(cfg, self%fSO4anth, label='so4_anthropogenic_fraction:', __RC__)
+    call ESMF_ConfigGetAttribute(cfg, self%rmed, label='particle_radius_number:', __RC__)
     call ESMF_ConfigGetAttribute(cfg, self%sigma, label='sigma:', __RC__)
     call ESMF_ConfigFindLabel (cfg, 'aviation_vertical_layers:', __RC__)
     do i=1,size(self%aviation_layers)
@@ -936,7 +939,7 @@ subroutine Run1 (GC, import, export, clock, RC)
 
     if (associated(dms)) then
        call DMSemission (self%km, self%cdt, MAPL_GRAV, t, u10m, v10m, lwi, delp, &
-                         fMassDMS, SU_DMSO, dms, SUEM, nDMS, __RC__)
+                         fMassDMS, dmso_conc, dms, SUEM, nDMS, __RC__)
     end if
 
 !   Add source of OCS-produced SO2
@@ -1144,7 +1147,7 @@ subroutine Run2 (GC, import, export, clock, RC)
                           SUWT, SUPSO4, SUPSO4WT, PSO4, PSO4WET, __RC__ )
 
 !   Certain variables are multiplied by 1.0e-9 to convert from nanometers to meters
-    call SU_Compute_Diags ( self%km, self%klid, self%radius(nSO4), self%sigma(nSO4), self%rhop(nSO4), &
+    call SU_Compute_Diags ( self%km, self%klid, self%rmed(nSO4), self%sigma(nSO4), self%rhop(nSO4), &
                             MAPL_GRAV, MAPL_PI, nSO4, self%diag_Mie, &
                             self%wavelengths_profile*1.0e-9, self%wavelengths_vertint*1.0e-9, &
                             t, airdens, delp, ple,tropp, rh2, u, v, DMS, SO2, SO4, dummyMSA, &
@@ -1163,7 +1166,7 @@ subroutine Run2 (GC, import, export, clock, RC)
     allocate(RH80(i1:i2,j1:j2,km), __STAT__)
 
     RH20(:,:,:) = 0.20
-    call SU_Compute_Diags ( km=self%km, klid=self%klid, rmed=self%radius(nSO4), sigma=self%sigma(nSO4),&
+    call SU_Compute_Diags ( km=self%km, klid=self%klid, rmed=self%rmed(nSO4), sigma=self%sigma(nSO4),& 
                             rhop=self%rhop(nSO4), &
                             grav=MAPL_GRAV, pi=MAPL_PI, nSO4=nSO4, mie=self%diag_Mie, &
                             wavelengths_profile=self%wavelengths_profile*1.0e-9, &
@@ -1173,7 +1176,7 @@ subroutine Run2 (GC, import, export, clock, RC)
                             scacoef = SUSCACOEFRH20, __RC__)
 
     RH80(:,:,:) = 0.80
-    call SU_Compute_Diags ( km=self%km, klid=self%klid, rmed=self%radius(nSO4), sigma=self%sigma(nSO4),&
+    call SU_Compute_Diags ( km=self%km, klid=self%klid, rmed=self%rmed(nSO4), sigma=self%sigma(nSO4),& 
                             rhop=self%rhop(nSO4), &
                             grav=MAPL_GRAV, pi=MAPL_PI, nSO4=nSO4, mie=self%diag_Mie, &
                             wavelengths_profile=self%wavelengths_profile*1.0e-9, &