diff --git a/physics/rascnv.F90 b/physics/rascnv.F90
index 79a5dce40..b23b04e9a 100644
--- a/physics/rascnv.F90
+++ b/physics/rascnv.F90
@@ -402,8 +402,9 @@ subroutine rascnv_run(IM,     k,      itc, ntc, ntr,   dt,  dtf   &
 !
       fscav_ = -999.0_kp                 ! By default no scavenging
       if (itc > 0 .and. ntc > 0) then
-        if (ntr >= itc + ntc - 3) then
-          fscav_(itc:ntc) = fscav
+        n = itc + ntc - 1
+        if (n <= ntr + 2) then
+          fscav_(itc:n) = fscav
         else
           errmsg = 'Error in rascnv_run: test ntr >= itc + ntc - 3 FAILED'
           errflg = 1
diff --git a/physics/rascnv.meta b/physics/rascnv.meta
index 3f61ac1c0..5832827aa 100644
--- a/physics/rascnv.meta
+++ b/physics/rascnv.meta
@@ -211,9 +211,9 @@
   intent = in
   optional = F
 [itc]
-  standard_name = number_of_aerosol_tracers_for_convection
-  long_name = number of aerosol tracers transported/scavenged by convection
-  units = count
+  standard_name = index_of_first_chemical_tracer_for_convection
+  long_name = index of first chemical tracer transported/scavenged by convection
+  units = index
   dimensions = ()
   type = integer
   intent = in
diff --git a/physics/samfaerosols.F b/physics/samfaerosols.F
index 87a2277dd..66faf1fb9 100644
--- a/physics/samfaerosols.F
+++ b/physics/samfaerosols.F
@@ -9,7 +9,7 @@ module samfcnv_aerosols
       contains
 
       subroutine samfdeepcnv_aerosols(im, ix, km, itc, ntc, ntr, delt,
-     &  xlamde, xlamdd, cnvflg, jmin, kb, kmax, kbcon, ktcon, fscav,
+     &  xlamde, xlamdd, cnvflg, jmin, kb, kmax, kd94, ktcon, fscav,
      &  edto, xlamd, xmb, c0t, eta, etad, zi, xlamue, xlamud, delp,
      &  qtr, qaero)
 
@@ -25,7 +25,7 @@ subroutine samfdeepcnv_aerosols(im, ix, km, itc, ntc, ntr, delt,
      &  xlamde, xlamdd
       logical,              dimension(im),          intent(in) :: cnvflg
       integer,              dimension(im),          intent(in) :: jmin,
-     &  kb, kmax, kbcon, ktcon
+     &  kb, kmax, kd94, ktcon
       real(kind=kind_phys), dimension(im),          intent(in) :: edto,
      &  xlamd, xmb
       real(kind=kind_phys), dimension(ntc),         intent(in) :: fscav
@@ -195,7 +195,7 @@ subroutine samfdeepcnv_aerosols(im, ix, km, itc, ntc, ntr, delt,
           do i = 1, im
             if (cnvflg(i) .and. (k < jmin(i))) then
               dz = zi(i,kp1) - zi(i,k)
-              if (k >= kbcon(i)) then
+              if (k >= kd94(i)) then
                 tem  = xlamde * dz
                 tem1 = half * xlamdd * dz
               else
@@ -264,7 +264,7 @@ subroutine samfdeepcnv_aerosols(im, ix, km, itc, ntc, ntr, delt,
               tem  = half * (xlamue(i,k) + xlamue(i,kk))
               tem1 = half * (xlamud(i,k) + xlamud(i,kk))
 
-              if (k <= kbcon(i)) then
+              if (k <= kd94(i)) then
                 ptem  = xlamde
                 ptem1 = xlamd(i) + xlamdd
               else
diff --git a/physics/samfdeepcnv.f b/physics/samfdeepcnv.f
index 95e99e7be..a7ea0009b 100644
--- a/physics/samfdeepcnv.f
+++ b/physics/samfdeepcnv.f
@@ -2683,7 +2683,7 @@ subroutine samfdeepcnv_run (im,km,itc,ntc,cliq,cp,cvap,           &
 
       if (do_aerosols)
      &  call samfdeepcnv_aerosols(im, im, km, itc, ntc, ntr, delt,
-     &  xlamde, xlamdd, cnvflg, jmin, kb, kmax, kbcon, ktcon, fscav,
+     &  xlamde, xlamdd, cnvflg, jmin, kb, kmax, kd94, ktcon, fscav,
      &  edto, xlamd, xmb, c0t, eta, etad, zi, xlamue, xlamud, delp,
      &  qtr, qaero)
 
diff --git a/physics/samfdeepcnv.meta b/physics/samfdeepcnv.meta
index 255213268..9ba69b1f2 100644
--- a/physics/samfdeepcnv.meta
+++ b/physics/samfdeepcnv.meta
@@ -62,9 +62,9 @@
   intent = in
   optional = F
 [itc]
-  standard_name = number_of_aerosol_tracers_for_convection
-  long_name = number of aerosol tracers transported/scavenged by convection
-  units = count
+  standard_name = index_of_first_chemical_tracer_for_convection
+  long_name = index of first chemical tracer transported/scavenged by convection
+  units = index
   dimensions = ()
   type = integer
   intent = in
diff --git a/physics/samfshalcnv.meta b/physics/samfshalcnv.meta
index 33f457b23..d72bb73cf 100644
--- a/physics/samfshalcnv.meta
+++ b/physics/samfshalcnv.meta
@@ -62,9 +62,9 @@
   intent = in
   optional = F
 [itc]
-  standard_name = number_of_aerosol_tracers_for_convection
-  long_name = number of aerosol tracers transported/scavenged by convection
-  units = count
+  standard_name = index_of_first_chemical_tracer_for_convection
+  long_name = index of first chemical tracer transported/scavenged by convection
+  units = index
   dimensions = ()
   type = integer
   intent = in