Changeset 5116 for branches/2015/dev_r5044_CNRS_LIM3CLEAN/NEMOGCM/NEMO/LIM_SRC_3/limthd.F90

Timestamp:

2015-03-03T11:15:02+01:00 (9 years ago)

Author:

clem

Message:

LIM3: change in the way turbulent heat flux at the ice base is handled of ice melting. Last cleaning/improvement before testing SETTE and merging with the trunk

File:

• branches/2015/dev_r5044_CNRS_LIM3CLEAN/NEMOGCM/NEMO/LIM_SRC_3/limthd.F90 (modified) (2 diffs)

branches/2015/dev_r5044_CNRS_LIM3CLEAN/NEMOGCM/NEMO/LIM_SRC_3/limthd.F90

@@ -184 +184 @@
             ENDIF
 
-            !-- Energy needed to bring ocean surface layer until its freezing (<0, J.m-2) --- !
+            ! --- Energy needed to bring ocean surface layer until its freezing (<0, J.m-2) --- !
             zqfr = tmask(ji,jj,1) * rau0 * rcp * fse3t_m(ji,jj) * ( t_bo(ji,jj) - ( sst_m(ji,jj) + rt0 ) )
 
+            ! --- Energy from the turbulent oceanic heat flux (W/m2) --- !
+            zfric_u      = MAX( SQRT( ust2s(ji,jj) ), zfric_umin ) 
+            fhtur(ji,jj) = MAX( 0._wp, rswitch * rau0 * rcp * zch  * zfric_u * ( ( sst_m(ji,jj) + rt0 ) - t_bo(ji,jj) ) ) ! W.m-2
+            fhtur(ji,jj) = rswitch * MIN( fhtur(ji,jj), - zqfr * r1_rdtice / MAX( at_i(ji,jj), epsi10 ) )
+            ! upper bound for fhtur: the heat retrieved from the ocean must be smaller than the heat necessary to reach 
+            !                        the freezing point, so that we do not have SST < T_freeze
+            !                        This implies: - ( fhtur(ji,jj) * at_i(ji,jj) * rtdice ) - zqfr >= 0
+
             !-- Energy Budget of the leads (J.m-2). Must be < 0 to form ice
-            qlead(ji,jj) = MIN( 0._wp , zqld - zqfr ) 
+            qlead(ji,jj) = MIN( 0._wp , zqld - ( fhtur(ji,jj) * at_i(ji,jj) * rdt_ice ) - zqfr )
 
             ! If there is ice and leads are warming, then transfer energy from the lead budget and use it for bottom melting 
@@ -198 +206 @@
             ENDIF
             !
-            !-- Energy from the turbulent oceanic heat flux --- !
-            !clem zfric_u        = MAX ( MIN( SQRT( ust2s(ji,jj) ) , zfric_umax ) , zfric_umin )
-            zfric_u      = MAX( SQRT( ust2s(ji,jj) ), zfric_umin ) 
-            fhtur(ji,jj) = MAX( 0._wp, rswitch * rau0 * rcp * zch  * zfric_u * ( ( sst_m(ji,jj) + rt0 ) - t_bo(ji,jj) ) ) ! W.m-2 
-            ! upper bound for fhtur: we do not want SST to drop below Tfreeze. 
-            ! So we say that the heat retrieved from the ocean (fhtur+fhld) must be < to the heat necessary to reach Tfreeze (zqfr)   
-            ! This is not a clean budget, so that should be corrected at some point
-            fhtur(ji,jj) = rswitch * MIN( fhtur(ji,jj), - fhld(ji,jj) - zqfr * r1_rdtice / MAX( at_i(ji,jj), epsi10 ) )
-
             ! -----------------------------------------
             ! Net heat flux on top of ice-ocean [W.m-2]