diff --git a/physics/module_sf_noahmplsm.f90 b/physics/module_sf_noahmplsm.f90
index 15a91db7d..46b572b65 100644
--- a/physics/module_sf_noahmplsm.f90
+++ b/physics/module_sf_noahmplsm.f90
@@ -5437,7 +5437,7 @@ subroutine thermalz0(parameters,fveg,z0m,z0mg,zlvl,zpd,ezpd,ustarx,          & !
         z0ht = z0mt
      elseif (opt_trs == 2) then
         z0mt  = fveg * z0m      + (1.0 - fveg) * z0mg
-        czil1=10.0 ** (- (0.40/0.07) * parameters%hvt)
+        czil1=10.0 ** (- 0.4 * parameters%hvt)
         z0ht = fveg * z0m*exp(-czil1*0.4*258.2*sqrt(ustarx*z0m))  &
             +(1.0 - fveg) * z0mg*exp(-czil1*0.4*258.2*sqrt(ustarx*z0mg))
      elseif (opt_trs == 3) then
@@ -5473,7 +5473,7 @@ subroutine thermalz0(parameters,fveg,z0m,z0mg,zlvl,zpd,ezpd,ustarx,          & !
      if (opt_trs == 1) then
         z0ht = z0mt
      elseif (opt_trs == 2) then
-        czil1=10.0 ** (- (0.40/0.07) * parameters%hvt)
+        czil1=10.0 ** (- 0.4 * parameters%hvt)
         z0ht =z0mt*exp(-czil1*0.4*258.2*sqrt(ustarx*z0mt))
      elseif (opt_trs == 3) then
       if (vegtyp.le.5) then
@@ -5499,7 +5499,7 @@ subroutine thermalz0(parameters,fveg,z0m,z0mg,zlvl,zpd,ezpd,ustarx,          & !
        if (opt_trs == 1) then
          z0ht    = z0mt
        elseif (opt_trs == 2) then
-         czil1= 10.0 ** (- (0.40/0.07) * parameters%hvt)
+         czil1= 10.0 ** (- 0.4 * parameters%hvt)
          z0ht = z0mt*exp(-czil1*0.4*258.2*sqrt(ustarx*z0mt))
        elseif (opt_trs == 3) then
          if (vegtyp.le.5) then
diff --git a/physics/noahmpdrv.F90 b/physics/noahmpdrv.F90
index 598a11b31..fed823ead 100644
--- a/physics/noahmpdrv.F90
+++ b/physics/noahmpdrv.F90
@@ -161,7 +161,7 @@ subroutine noahmpdrv_run                                       &
       sncovr1, qsurf, gflux, drain, evap, hflx, ep, runoff,      &
       cmm, chh, evbs, evcw, sbsno, pah, ecan, etran, edir, snowc,&
       stm, snohf,smcwlt2, smcref2, wet1, t2mmp, q2mp,zvfun,      &
-      errmsg, errflg)     
+      ztmax, errmsg, errflg)     
 
   use machine ,   only : kind_phys
   use funcphys,   only : fpvs
@@ -360,6 +360,7 @@ subroutine noahmpdrv_run                                       &
   real(kind=kind_phys), dimension(:)     , intent(out)   :: t2mmp      ! combined T2m from tiles
   real(kind=kind_phys), dimension(:)     , intent(out)   :: q2mp       ! combined q2m from tiles
   real(kind=kind_phys), dimension(:)     , intent(out)   :: zvfun      ! 
+  real(kind=kind_phys), dimension(:)     , intent(out)   :: ztmax      ! thermal roughness length
   character(len=*)    ,                    intent(out)   :: errmsg
   integer             ,                    intent(out)   :: errflg
 
@@ -956,6 +957,7 @@ subroutine noahmpdrv_run                                       &
       cmxy      (i)   = cm_noahmp
       chxy      (i)   = ch_noahmp
       zorl      (i)   = z0_total * 100.0  ! convert to cm
+      ztmax     (i)   = z0h_total 
 
       smc       (i,:) = soil_moisture_vol
       slc       (i,:) = soil_liquid_vol
diff --git a/physics/noahmpdrv.meta b/physics/noahmpdrv.meta
index 9ad9092ec..3235b7c90 100644
--- a/physics/noahmpdrv.meta
+++ b/physics/noahmpdrv.meta
@@ -1314,6 +1314,14 @@
   type = real
   kind = kind_phys
   intent = out
+[ztmax]
+  standard_name = bounded_surface_roughness_length_for_heat_over_land
+  long_name = bounded surface roughness length for heat over land
+  units = m
+  dimensions = (horizontal_loop_extent)
+  type = real
+  kind = kind_phys
+  intent = out
 [errmsg]
   standard_name = ccpp_error_message
   long_name = error message for error handling in CCPP