Changeset 5350 for branches/2014/dev_r5134_UKMO4_CF_compliance/NEMOGCM/NEMO/LIM_SRC_3/limthd_dif.F90

Timestamp:

2015-06-04T16:12:19+02:00 (9 years ago)

Author:

hadcv

Message:

Update to head of the trunk (r5344).

File:

• branches/2014/dev_r5134_UKMO4_CF_compliance/NEMOGCM/NEMO/LIM_SRC_3/limthd_dif.F90 (modified) (9 diffs)

branches/2014/dev_r5134_UKMO4_CF_compliance/NEMOGCM/NEMO/LIM_SRC_3/limthd_dif.F90

@@ -120 +120 @@
       REAL(wp), POINTER, DIMENSION(:)     ::   zh_s        ! snow layer thickness
       REAL(wp), POINTER, DIMENSION(:)     ::   zfsw        ! solar radiation absorbed at the surface
+      REAL(wp), POINTER, DIMENSION(:)     ::   zqns_ice_b  ! solar radiation absorbed at the surface
       REAL(wp), POINTER, DIMENSION(:)     ::   zf          ! surface flux function
       REAL(wp), POINTER, DIMENSION(:)     ::   dzf         ! derivative of the surface flux function
@@ -168 +169 @@
       CALL wrk_alloc( jpij, numeqmin, numeqmax )
       CALL wrk_alloc( jpij, isnow, ztsub, ztsubit, zh_i, zh_s, zfsw )
-      CALL wrk_alloc( jpij, zf, dzf, zerrit, zdifcase, zftrice, zihic, zghe )
-      CALL wrk_alloc( jpij, nlay_i+1, ztcond_i, zradtr_i, zradab_i, zkappa_i, ztib, zeta_i, ztitemp, z_i, zspeche_i, kjstart=0)
-      CALL wrk_alloc( jpij, nlay_s+1,           zradtr_s, zradab_s, zkappa_s, ztsb, zeta_s, ztstemp, z_s, kjstart=0)
-      CALL wrk_alloc( jpij, nlay_i+3, zindterm, zindtbis, zdiagbis  )
-      CALL wrk_alloc( jpij, nlay_i+3, 3, ztrid )
+      CALL wrk_alloc( jpij, zf, dzf, zqns_ice_b, zerrit, zdifcase, zftrice, zihic, zghe )
+      CALL wrk_alloc( jpij,nlay_i+1, ztcond_i, zradtr_i, zradab_i, zkappa_i, ztib, zeta_i, ztitemp, z_i, zspeche_i, kjstart=0 )
+      CALL wrk_alloc( jpij,nlay_s+1,           zradtr_s, zradab_s, zkappa_s, ztsb, zeta_s, ztstemp, z_s, kjstart=0 )
+      CALL wrk_alloc( jpij,nlay_i+3, zindterm, zindtbis, zdiagbis  )
+      CALL wrk_alloc( jpij,nlay_i+3,3, ztrid )
 
       CALL wrk_alloc( jpij, zdq, zq_ini, zhfx_err )
@@ -242 +243 @@
       !-------------------------------------------------------
       DO ji = kideb , kiut
-         zfsw   (ji) =  qsr_ice_1d(ji) * ( 1 - i0(ji) )   ! Shortwave radiation absorbed at surface
-         zftrice(ji) =  qsr_ice_1d(ji) *       i0(ji)     ! Solar radiation transmitted below the surface layer
-         dzf    (ji) = dqns_ice_1d(ji)                    ! derivative of incoming nonsolar flux 
+         zfsw   (ji)    =  qsr_ice_1d(ji) * ( 1 - i0(ji) )   ! Shortwave radiation absorbed at surface
+         zftrice(ji)    =  qsr_ice_1d(ji) *       i0(ji)     ! Solar radiation transmitted below the surface layer
+         dzf    (ji)    = dqns_ice_1d(ji)                    ! derivative of incoming nonsolar flux 
+         zqns_ice_b(ji) = qns_ice_1d(ji)                     ! store previous qns_ice_1d value
       END DO
 
@@ -452 +454 @@
          !------------------------------------------------------------------------------|
          !
-         IF( .NOT. lk_cpl ) THEN   !--- forced atmosphere case
+         IF ( ln_it_qnsice ) THEN 
             DO ji = kideb , kiut
                ! update of the non solar flux according to the update in T_su
@@ -677 +679 @@
          END DO
 
-         DO numeq = nlay_i + nlay_s + 1, nlay_s + 2, -1
+         DO numeq = nlay_i + nlay_s, nlay_s + 2, -1
             DO ji = kideb , kiut
                jk    =  numeq - nlay_s - 1
@@ -757 +759 @@
       CALL lim_thd_enmelt( kideb, kiut )
 
+      ! --- diagnose the change in non-solar flux due to surface temperature change --- !
+      IF ( ln_it_qnsice ) hfx_err_dif_1d(:) = hfx_err_dif_1d(:) - ( qns_ice_1d(:)  - zqns_ice_b(:) ) * a_i_1d(:) 
 
       ! --- diag conservation imbalance on heat diffusion - PART 2 --- !
@@ -768 +772 @@
          ENDIF
          hfx_err_1d(ji) = hfx_err_1d(ji) + zhfx_err(ji) * a_i_1d(ji)
+
+         ! total heat that is sent to the ocean (i.e. not used in the heat diffusion equation)
+         hfx_err_dif_1d(ji) = hfx_err_dif_1d(ji) + zhfx_err(ji) * a_i_1d(ji)
       END DO 
-
-      ! diagnose external surface (forced case) or bottom (forced case) from heat conservation
-      IF( .NOT. lk_cpl ) THEN   ! --- forced case: qns_ice and fc_su are diagnosed
-         !
-         DO ji = kideb, kiut
-            qns_ice_1d(ji) = qns_ice_1d(ji) - zhfx_err(ji)
-            fc_su     (ji) = fc_su(ji)      - zhfx_err(ji)
-         END DO
-         !
-      ELSE                      ! --- coupled case: ocean turbulent heat flux is diagnosed
-         !
-         DO ji = kideb, kiut
-            fhtur_1d  (ji) = fhtur_1d(ji)   - zhfx_err(ji)
-         END DO
-         !
-      ENDIF
 
       !-----------------------------------------
@@ -797 +788 @@
                &             ( fc_su(ji) + i0(ji) * qsr_ice_1d(ji) - zradtr_i(ji,nlay_i) - fc_bo_i(ji) ) * a_i_1d(ji)
          ENDIF
-      END DO
-
-      ! --- compute diagnostic net heat flux at the surface of the snow-ice system (W.m-2)
-      DO ji = kideb, kiut
-         ii = MOD( npb(ji) - 1, jpi ) + 1 ; ij = ( npb(ji) - 1 ) / jpi + 1
-         hfx_in (ii,ij) = hfx_in (ii,ij) + a_i_1d(ji) * ( qsr_ice_1d(ji) + qns_ice_1d(ji) )
-      END DO
-   
+         ! correction on the diagnosed heat flux due to non-convergence of the algorithm used to solve heat equation
+         hfx_dif_1d(ji) = hfx_dif_1d(ji) - zhfx_err(ji) * a_i_1d(ji)
+      END DO   
       !
       CALL wrk_dealloc( jpij, numeqmin, numeqmax )
       CALL wrk_dealloc( jpij, isnow, ztsub, ztsubit, zh_i, zh_s, zfsw )
       CALL wrk_dealloc( jpij, zf, dzf, zerrit, zdifcase, zftrice, zihic, zghe )
-      CALL wrk_dealloc( jpij, nlay_i+1, ztcond_i, zradtr_i, zradab_i, zkappa_i,   &
-         &              ztib, zeta_i, ztitemp, z_i, zspeche_i, kjstart = 0 )
-      CALL wrk_dealloc( jpij, nlay_s+1,           zradtr_s, zradab_s, zkappa_s, ztsb, zeta_s, ztstemp, z_s, kjstart = 0 )
-      CALL wrk_dealloc( jpij, nlay_i+3, zindterm, zindtbis, zdiagbis )
-      CALL wrk_dealloc( jpij, nlay_i+3, 3, ztrid )
+      CALL wrk_dealloc( jpij,nlay_i+1, ztcond_i, zradtr_i, zradab_i, zkappa_i, ztib, zeta_i, ztitemp, z_i, zspeche_i, kjstart = 0 )
+      CALL wrk_dealloc( jpij,nlay_s+1,           zradtr_s, zradab_s, zkappa_s, ztsb, zeta_s, ztstemp, z_s, kjstart = 0 )
+      CALL wrk_dealloc( jpij,nlay_i+3, zindterm, zindtbis, zdiagbis )
+      CALL wrk_dealloc( jpij,nlay_i+3,3, ztrid )
       CALL wrk_dealloc( jpij, zdq, zq_ini, zhfx_err )
 
@@ -834 +819 @@
       DO jk = 1, nlay_i             ! Sea ice energy of melting
          DO ji = kideb, kiut
-            ztmelts      = - tmut  * s_i_1d(ji,jk) + rt0 
-            rswitch      = MAX( 0._wp , SIGN( 1._wp , -(t_i_1d(ji,jk) - rt0) - epsi20 ) )
-            q_i_1d(ji,jk) = rhoic * ( cpic * ( ztmelts - t_i_1d(ji,jk) )                                                &
-               &                   + lfus * ( 1.0 - rswitch * ( ztmelts-rt0 ) / MIN( t_i_1d(ji,jk) - rt0, -epsi20 ) )   &
-               &                   - rcp  *                   ( ztmelts-rt0 )  ) 
+            ztmelts      = - tmut  * s_i_1d(ji,jk) + rt0
+            t_i_1d(ji,jk) = MIN( t_i_1d(ji,jk), ztmelts ) ! Force t_i_1d to be lower than melting point
+                                                          !   (sometimes dif scheme produces abnormally high temperatures)   
+            q_i_1d(ji,jk) = rhoic * ( cpic * ( ztmelts - t_i_1d(ji,jk) )                           &
+               &                    + lfus * ( 1.0 - ( ztmelts-rt0 ) / ( t_i_1d(ji,jk) - rt0 ) )   &
+               &                    - rcp  *         ( ztmelts-rt0 )  ) 
          END DO
       END DO