Changeset 13249 for NEMO/branches/2020/r4.0-HEAD_r12713_clem_dan_fixcpl/src/OCE/ZDF/zdfgls.F90

Timestamp:

2020-07-04T10:22:08+02:00 (4 years ago)

Author:

clem

Message:

merge with Jerome's branch NEMO_4.03_IODRAG

File:

• NEMO/branches/2020/r4.0-HEAD_r12713_clem_dan_fixcpl/src/OCE/ZDF/zdfgls.F90 (modified) (12 diffs)

NEMO/branches/2020/r4.0-HEAD_r12713_clem_dan_fixcpl/src/OCE/ZDF/zdfgls.F90

@@ -53 +53 @@
    INTEGER  ::   nn_bc_bot         ! bottom boundary condition (=0/1)
    INTEGER  ::   nn_z0_met         ! Method for surface roughness computation
+   INTEGER  ::   nn_z0_ice         ! Roughness accounting for sea ice
    INTEGER  ::   nn_stab_func      ! stability functions G88, KC or Canuto (=0/1/2)
    INTEGER  ::   nn_clos           ! closure 0/1/2/3 MY82/k-eps/k-w/gen
@@ -61 +62 @@
    REAL(wp) ::   rn_crban          ! Craig and Banner constant for surface breaking waves mixing
    REAL(wp) ::   rn_hsro           ! Minimum surface roughness
+   REAL(wp) ::   rn_hsri           ! Ice ocean roughness
    REAL(wp) ::   rn_frac_hs        ! Fraction of wave height as surface roughness (if nn_z0_met > 1) 
 
@@ -150 +152 @@
       REAL(wp), DIMENSION(jpi,jpj)     ::   zflxs       ! Turbulence fluxed induced by internal waves 
       REAL(wp), DIMENSION(jpi,jpj)     ::   zhsro       ! Surface roughness (surface waves)
+      REAL(wp), DIMENSION(jpi,jpj)     ::   zice_fra    ! Tapering of wave breaking under sea ice
       REAL(wp), DIMENSION(jpi,jpj,jpk) ::   eb          ! tke at time before
       REAL(wp), DIMENSION(jpi,jpj,jpk) ::   hmxl_b      ! mixing length at time before
@@ -165 +168 @@
       ustar2_bot (:,:) = 0._wp
 
+      SELECT CASE ( nn_z0_ice )
+      CASE( 0 )   ;   zice_fra(:,:) = 0._wp
+      CASE( 1 )   ;   zice_fra(:,:) =        TANH( fr_i(:,:) * 10._wp )
+      CASE( 2 )   ;   zice_fra(:,:) =              fr_i(:,:)
+      CASE( 3 )   ;   zice_fra(:,:) = MIN( 4._wp * fr_i(:,:) , 1._wp )
+      END SELECT
+      
       ! Compute surface, top and bottom friction at T-points
       DO jj = 2, jpjm1          
@@ -206 +216 @@
       END SELECT
       !
+      ! adapt roughness where there is sea ice
+      zhsro(:,:) = ( (1._wp-zice_fra(:,:)) * zhsro(:,:) + zice_fra(:,:) * rn_hsri )*tmask(:,:,1)  + (1._wp - tmask(:,:,1))*rn_hsro
+      !
       DO jk = 2, jpkm1              !==  Compute dissipation rate  ==!
          DO jj = 1, jpjm1
@@ -300 +313 @@
       CASE ( 0 )             ! Dirichlet boundary condition (set e at k=1 & 2) 
       ! First level
-      en   (:,:,1) = MAX(  rn_emin , rc02r * ustar2_surf(:,:) * (1._wp + rsbc_tke1)**r2_3  )
+      en   (:,:,1) = MAX(  rn_emin , rc02r * ustar2_surf(:,:) * (1._wp + (1._wp-zice_fra(:,:))*rsbc_tke1)**r2_3  )
       zd_lw(:,:,1) = en(:,:,1)
       zd_up(:,:,1) = 0._wp
@@ -306 +319 @@
       ! 
       ! One level below
-      en   (:,:,2) =  MAX(  rc02r * ustar2_surf(:,:) * (  1._wp + rsbc_tke1 * ((zhsro(:,:)+gdepw_n(:,:,2))   &
-         &                 / zhsro(:,:) )**(1.5_wp*ra_sf)  )**(2._wp/3._wp)                      , rn_emin   )
+      en   (:,:,2) =  MAX(  rc02r * ustar2_surf(:,:) * (  1._wp + (1._wp-zice_fra(:,:))*rsbc_tke1 * ((zhsro(:,:)+gdepw_n(:,:,2)) &
+         &                 / zhsro(:,:) )**(1.5_wp*ra_sf)  )**(2._wp/3._wp) , rn_emin   )
       zd_lw(:,:,2) = 0._wp 
       zd_up(:,:,2) = 0._wp
@@ -316 +329 @@
       !
       ! Dirichlet conditions at k=1
-      en   (:,:,1) = MAX(  rc02r * ustar2_surf(:,:) * (1._wp + rsbc_tke1)**r2_3 , rn_emin  )
+      en   (:,:,1) = MAX(  rc02r * ustar2_surf(:,:) * (1._wp + (1._wp-zice_fra(:,:))*rsbc_tke1)**r2_3 , rn_emin  )
       zd_lw(:,:,1) = en(:,:,1)
       zd_up(:,:,1) = 0._wp
@@ -326 +339 @@
       zd_lw(:,:,2) = 0._wp
       zkar (:,:)   = (rl_sf + (vkarmn-rl_sf)*(1.-EXP(-rtrans*gdept_n(:,:,1)/zhsro(:,:)) ))
-      zflxs(:,:)   = rsbc_tke2 * ustar2_surf(:,:)**1.5_wp * zkar(:,:) &
+      zflxs(:,:)   = rsbc_tke2 * (1._wp-zice_fra(:,:)) * ustar2_surf(:,:)**1.5_wp * zkar(:,:) &
           &                    * (  ( zhsro(:,:)+gdept_n(:,:,1) ) / zhsro(:,:)  )**(1.5_wp*ra_sf)
 !!gm why not   :                        * ( 1._wp + gdept_n(:,:,1) / zhsro(:,:) )**(1.5_wp*ra_sf)
@@ -577 +590 @@
          zkar (:,:)   = rl_sf + (vkarmn-rl_sf)*(1._wp-EXP(-rtrans*gdept_n(:,:,1)/zhsro(:,:) )) ! Lengh scale slope
          zdep (:,:)   = ((zhsro(:,:) + gdept_n(:,:,1)) / zhsro(:,:))**(rmm*ra_sf)
-         zflxs(:,:)   = (rnn + rsbc_tke1 * (rnn + rmm*ra_sf) * zdep(:,:))*(1._wp + rsbc_tke1*zdep(:,:))**(2._wp*rmm/3._wp-1_wp)
+         zflxs(:,:)   = (rnn + (1._wp-zice_fra(:,:))*rsbc_tke1 * (rnn + rmm*ra_sf) * zdep(:,:)) &
+            &           *(1._wp + (1._wp-zice_fra(:,:))*rsbc_tke1*zdep(:,:))**(2._wp*rmm/3._wp-1_wp)
          zdep (:,:)   = rsbc_psi1 * (zwall_psi(:,:,1)*p_avm(:,:,1)+zwall_psi(:,:,2)*p_avm(:,:,2)) * &
             &           ustar2_surf(:,:)**rmm * zkar(:,:)**rnn * (zhsro(:,:) + gdept_n(:,:,1))**(rnn-1.)
@@ -850 +864 @@
       REAL(wp)::   zcr   ! local scalar
       !!
-      NAMELIST/namzdf_gls/rn_emin, rn_epsmin, ln_length_lim, &
-         &            rn_clim_galp, ln_sigpsi, rn_hsro,      &
-         &            rn_crban, rn_charn, rn_frac_hs,        &
-         &            nn_bc_surf, nn_bc_bot, nn_z0_met,      &
+      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_bc_surf, nn_bc_bot, nn_z0_met, nn_z0_ice, &
          &            nn_stab_func, nn_clos
       !!----------------------------------------------------------
@@ -881 +895 @@
          WRITE(numout,*) '      Charnock coefficient                          rn_charn       = ', rn_charn
          WRITE(numout,*) '      Surface roughness formula                     nn_z0_met      = ', nn_z0_met
+         WRITE(numout,*) '      surface wave breaking under ice               nn_z0_ice      = ', nn_z0_ice
+         SELECT CASE( nn_z0_ice )
+         CASE( 0 )   ;   WRITE(numout,*) '   ==>>>   no impact of ice cover on surface wave breaking'
+         CASE( 1 )   ;   WRITE(numout,*) '   ==>>>   roughness uses rn_hsri and is weigthed by 1-TANH( fr_i(:,:) * 10 )'
+         CASE( 2 )   ;   WRITE(numout,*) '   ==>>>   roughness uses rn_hsri and is weighted by 1-fr_i(:,:)'
+         CASE( 3 )   ;   WRITE(numout,*) '   ==>>>   roughness uses rn_hsri and is weighted by 1-MIN( 1, 4 * fr_i(:,:) )'
+         CASE DEFAULT
+            CALL ctl_stop( 'zdf_gls_init: wrong value for nn_z0_ice, should be 0,1,2, or 3')
+         END SELECT
          WRITE(numout,*) '      Wave height frac. (used if nn_z0_met=2)       rn_frac_hs     = ', rn_frac_hs
          WRITE(numout,*) '      Stability functions                           nn_stab_func   = ', nn_stab_func
          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,*)
          WRITE(numout,*) '   Namelist namdrg_top/_bot:   used values:'