Changeset 14966

Timestamp:

2021-06-10T08:53:14+02:00 (22 months ago)

Author:

cbricaud

Message:

add scaling of mixing under sea-ice in GLS (as for TKE) ; see ticket #2604

Location:

NEMO/trunk

Files:

• cfgs/SHARED/namelist_ref (modified) (1 diff)
• src/OCE/ZDF/zdfgls.F90 (modified) (5 diffs)

NEMO/trunk/cfgs/SHARED/namelist_ref

@@ -1234 +1234 @@
    !                       !           = 2 roughness uses rn_hsri and is weighted by 1-fr_i
    !                       !           = 3 roughness uses rn_hsri and is weighted by 1-MIN(1,4*fr_i)
+   nn_mxlice     =     1   !  mixing under sea ice
+                           !     = 0 No scaling under sea-ice
+                           !     = 1 scaling with constant Ice-ocean roughness (rn_hsri)
+                           !     = 2 scaling with mean sea-ice thickness
+                           !     = 3 scaling with max sea-ice thickness
    nn_bc_surf    =     1   !  surface condition (0/1=Dir/Neum)
    nn_bc_bot     =     1   !  bottom condition (0/1=Dir/Neum)

NEMO/trunk/src/OCE/ZDF/zdfgls.F90

@@ -26 +26 @@
    USE zdfmxl         ! mixed layer
    USE sbcwave , ONLY : hsw   ! significant wave height
+#if defined key_si3
+   USE ice, ONLY: hm_i, h_i
+#endif
+#if defined key_cice
+   USE sbc_ice, ONLY: h_i
+#endif
    !
    USE lbclnk         ! ocean lateral boundary conditions (or mpp link)
@@ -51 +57 @@
    LOGICAL  ::   ln_length_lim     ! use limit on the dissipation rate under stable stratification (Galperin et al. 1988)
    LOGICAL  ::   ln_sigpsi         ! Activate Burchard (2003) modification for k-eps closure & wave breaking mixing
+   INTEGER  ::   nn_mxlice         ! type of scaling under sea-ice (=0/1/2/3)
    INTEGER  ::   nn_bc_surf        ! surface boundary condition (=0/1)
    INTEGER  ::   nn_bc_bot         ! bottom boundary condition (=0/1)
@@ -224 +231 @@
       !
       ! adapt roughness where there is sea ice
-      DO_2D( nn_hls-1, nn_hls-1, nn_hls-1, nn_hls-1 )
-         zhsro(ji,jj) = ( (1._wp-zice_fra(ji,jj)) * zhsro(ji,jj) + zice_fra(ji,jj) * rn_hsri )*tmask(ji,jj,1)  + &
-            &           (1._wp - tmask(ji,jj,1))*rn_hsro
-      END_2D
+      SELECT CASE( nn_mxlice )       ! Type of scaling under sea-ice
+      !
+      CASE( 1 )                      ! scaling with constant sea-ice roughness
+         DO_2D( nn_hls-1, nn_hls-1, nn_hls-1, nn_hls-1 )
+            zhsro(ji,jj) = ( (1._wp-zice_fra(ji,jj)) * zhsro(ji,jj) + zice_fra(ji,jj) * rn_hsri )*tmask(ji,jj,1)  + (1._wp - tmask(ji,jj,1))*rn_hsro
+         END_2D
+         !
+      CASE( 2 )                      ! scaling with mean sea-ice thickness
+#if defined key_si3
+         DO_2D( nn_hls-1, nn_hls-1, nn_hls-1, nn_hls-1 )
+            zhsro(ji,jj) = ( (1._wp-zice_fra(ji,jj)) * zhsro(ji,jj) + zice_fra(ji,jj) * hm_i(ji,jj) )*tmask(ji,jj,1)  + (1._wp - tmask(ji,jj,1))*rn_hsro
+         END_2D
+#endif
+         !
+      CASE( 3 )                      ! scaling with max sea-ice thickness
+#if defined key_si3 || defined key_cice
+         DO_2D( nn_hls-1, nn_hls-1, nn_hls-1, nn_hls-1 )
+            zhsro(ji,jj) = ( (1._wp-zice_fra(ji,jj)) * zhsro(ji,jj) + zice_fra(ji,jj) * MAXVAL(h_i(ji,jj,:)) )*tmask(ji,jj,1)  + (1._wp - tmask(ji,jj,1))*rn_hsro
+         END_2D
+#endif
+         !
+      END SELECT
       !
       DO_3D( nn_hls-1, nn_hls-1, nn_hls-1, nn_hls-1, 2, jpkm1 )  !==  Compute dissipation rate  ==!
@@ -799 +824 @@
       NAMELIST/namzdf_gls/rn_emin, rn_epsmin, ln_length_lim,       &
          &            rn_clim_galp, ln_sigpsi, rn_hsro, rn_hsri,   &
-         &            rn_crban, rn_charn, rn_frac_hs,              &
+         &            nn_mxlice, rn_crban, rn_charn, rn_frac_hs,   &
          &            nn_bc_surf, nn_bc_bot, nn_z0_met, nn_z0_ice, &
          &            nn_stab_func, nn_clos
@@ -839 +864 @@
          WRITE(numout,*) '      Type of closure                               nn_clos        = ', nn_clos
          WRITE(numout,*) '      Surface roughness (m)                         rn_hsro        = ', rn_hsro
-         WRITE(numout,*) '      Ice-ocean roughness (used if nn_z0_ice/=0)    rn_hsri        = ', rn_hsri
+         WRITE(numout,*) '      type of scaling under sea-ice                 nn_mxlice      = ', nn_mxlice
+         IF( nn_mxlice == 1 ) &
+            WRITE(numout,*) '      Ice-ocean roughness (used if nn_z0_ice/=0) rn_hsri        = ', rn_hsri
+         SELECT CASE( nn_mxlice )             ! Type of scaling under sea-ice
+            CASE( 0 )   ;   WRITE(numout,*) '   ==>>>   No scaling under sea-ice'
+            CASE( 1 )   ;   WRITE(numout,*) '   ==>>>   scaling with constant sea-ice thickness'
+            CASE( 2 )   ;   WRITE(numout,*) '   ==>>>   scaling with mean     sea-ice thickness'
+            CASE( 3 )   ;   WRITE(numout,*) '   ==>>>   scaling with max      sea-ice thickness'
+            CASE DEFAULT
+               CALL ctl_stop( 'zdf_tke_init: wrong value for nn_mxlice, should be 0,1,2,3 ')
+         END SELECT
          WRITE(numout,*)
       ENDIF