Changeset 12725 for NEMO/branches/2020/r4.0-HEAD_r12713_clem_dan_fixcpl/src/ICE/icevar.F90

Timestamp:

2020-04-09T15:48:28+02:00 (4 years ago)

Author:

clem

Message:

fix previous revision. Make sure a_ip and a_ip_eff are correct

File:

• NEMO/branches/2020/r4.0-HEAD_r12713_clem_dan_fixcpl/src/ICE/icevar.F90 (modified) (3 diffs)

NEMO/branches/2020/r4.0-HEAD_r12713_clem_dan_fixcpl/src/ICE/icevar.F90

@@ -185 +185 @@
       REAL(wp) ::   zhmax, z1_zhmax                 !   -      -
       REAL(wp) ::   zlay_i, zlay_s                  !   -      -
-      REAL(wp), DIMENSION(jpi,jpj,jpl) ::   z1_a_i, z1_v_i
+      REAL(wp), PARAMETER ::   zhl_max =  0.015_wp  ! pond lid thickness above which the ponds disappear from the albedo calculation
+      REAL(wp), PARAMETER ::   zhl_min =  0.005_wp  ! pond lid thickness below which the full pond area is used in the albedo calculation
+      REAL(wp), DIMENSION(jpi,jpj,jpl) ::   z1_a_i, z1_v_i, z1_a_ip
       !!-------------------------------------------------------------------
 
@@ -204 +206 @@
       ELSEWHERE                      ;   z1_v_i(:,:,:) = 0._wp
       END WHERE
+      !
+      WHERE( a_ip(:,:,:) > epsi20 )  ;   z1_a_ip(:,:,:) = 1._wp / a_ip(:,:,:)
+      ELSEWHERE                      ;   z1_a_ip(:,:,:) = 0._wp
+      END WHERE
       !                                           !--- ice thickness
       h_i(:,:,:) = v_i (:,:,:) * z1_a_i(:,:,:)
@@ -218 +224 @@
       !                                           !--- ice age      
       o_i(:,:,:) = oa_i(:,:,:) * z1_a_i(:,:,:)
-      !                                           !--- pond fraction and thickness      
+      !                                           !--- pond and lid thickness      
+      h_ip(:,:,:) = v_ip(:,:,:) * z1_a_ip(:,:,:)
+      h_il(:,:,:) = v_il(:,:,:) * z1_a_ip(:,:,:)
+      !                                           !--- melt pond effective area (used for albedo)
       a_ip_frac(:,:,:) = a_ip(:,:,:) * z1_a_i(:,:,:)
-      WHERE( a_ip_frac(:,:,:) > epsi20 )   ;   h_ip(:,:,:) = v_ip(:,:,:) * z1_a_i(:,:,:) / a_ip_frac(:,:,:)
-      ELSEWHERE                            ;   h_ip(:,:,:) = 0._wp
-      END WHERE
-      !                                           !--- pond lid thickness      
-      WHERE( a_ip_frac(:,:,:) > epsi20 )   ;   h_il(:,:,:) = v_il(:,:,:) * z1_a_i(:,:,:) / a_ip_frac(:,:,:)
-      ELSEWHERE                            ;   h_il(:,:,:) = 0._wp
-      END WHERE
-      !
+      WHERE    ( h_il(:,:,:) <= zhl_min )  ;   a_ip_eff(:,:,:) = a_ip_frac(:,:,:)       ! lid is very thin.  Expose all the pond
+      ELSEWHERE( h_il(:,:,:) >= zhl_max )  ;   a_ip_eff(:,:,:) = 0._wp                  ! lid is very thick. Cover all the pond up with ice and snow
+      ELSEWHERE                            ;   a_ip_eff(:,:,:) = a_ip_frac(:,:,:) * &   ! lid is in between. Expose part of the pond
+         &                                                       ( h_il(:,:,:) - zhl_min ) / ( zhl_max - zhl_min )
+      END WHERE
       !                                           !---  salinity (with a minimum value imposed everywhere)     
       IF( nn_icesal == 2 ) THEN