- Timestamp:
- 2020-09-15T12:49:18+02:00 (4 years ago)
- File:
-
- 1 edited
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NEMO/branches/2020/temporary_r4_trunk/src/ICE/icethd.F90
r13466 r13469 120 120 zu_io(:,:) = u_ice(:,:) - ssu_m(:,:) 121 121 zv_io(:,:) = v_ice(:,:) - ssv_m(:,:) 122 DO jj = 2, jpjm1 123 DO ji = fs_2, fs_jpim1 124 zfric(ji,jj) = rn_cio * ( 0.5_wp * & 125 & ( zu_io(ji,jj) * zu_io(ji,jj) + zu_io(ji-1,jj) * zu_io(ji-1,jj) & 126 & + zv_io(ji,jj) * zv_io(ji,jj) + zv_io(ji,jj-1) * zv_io(ji,jj-1) ) ) * tmask(ji,jj,1) 127 END DO 128 END DO 122 DO_2D_00_00 123 zfric(ji,jj) = rn_cio * ( 0.5_wp * & 124 & ( zu_io(ji,jj) * zu_io(ji,jj) + zu_io(ji-1,jj) * zu_io(ji-1,jj) & 125 & + zv_io(ji,jj) * zv_io(ji,jj) + zv_io(ji,jj-1) * zv_io(ji,jj-1) ) ) * tmask(ji,jj,1) 126 END_2D 129 127 ELSE ! if no ice dynamics => transmit directly the atmospheric stress to the ocean 130 DO jj = 2, jpjm1 131 DO ji = fs_2, fs_jpim1 132 zfric(ji,jj) = r1_rau0 * SQRT( 0.5_wp * & 133 & ( utau(ji,jj) * utau(ji,jj) + utau(ji-1,jj) * utau(ji-1,jj) & 134 & + vtau(ji,jj) * vtau(ji,jj) + vtau(ji,jj-1) * vtau(ji,jj-1) ) ) * tmask(ji,jj,1) 135 END DO 136 END DO 128 DO_2D_00_00 129 zfric(ji,jj) = r1_rau0 * SQRT( 0.5_wp * & 130 & ( utau(ji,jj) * utau(ji,jj) + utau(ji-1,jj) * utau(ji-1,jj) & 131 & + vtau(ji,jj) * vtau(ji,jj) + vtau(ji,jj-1) * vtau(ji,jj-1) ) ) * tmask(ji,jj,1) 132 END_2D 137 133 ENDIF 138 134 CALL lbc_lnk( 'icethd', zfric, 'T', 1. ) … … 141 137 ! Partial computation of forcing for the thermodynamic sea ice model 142 138 !--------------------------------------------------------------------! 143 DO jj = 1, jpj 144 DO ji = 1, jpi 145 rswitch = tmask(ji,jj,1) * MAX( 0._wp , SIGN( 1._wp , at_i(ji,jj) - epsi10 ) ) ! 0 if no ice 146 ! 147 ! ! solar irradiance transmission at the mixed layer bottom and used in the lead heat budget 148 ! ! practically no "direct lateral ablation" 149 ! 150 ! ! net downward heat flux from the ice to the ocean, expressed as a function of ocean 151 ! ! temperature and turbulent mixing (McPhee, 1992) 152 ! 153 ! --- Energy received in the lead from atm-oce exchanges, zqld is defined everywhere (J.m-2) --- ! 154 zqld = tmask(ji,jj,1) * rdt_ice * & 155 & ( ( 1._wp - at_i_b(ji,jj) ) * qsr_oce(ji,jj) * frq_m(ji,jj) + & 156 & ( 1._wp - at_i_b(ji,jj) ) * qns_oce(ji,jj) + qemp_oce(ji,jj) ) 157 158 ! --- Energy needed to bring ocean surface layer until its freezing (mostly<0 but >0 if supercooling, J.m-2) --- ! 159 zqfr = rau0 * rcp * e3t_m(ji,jj) * ( t_bo(ji,jj) - ( sst_m(ji,jj) + rt0 ) ) * tmask(ji,jj,1) ! both < 0 (t_bo < sst) and > 0 (t_bo > sst) 160 zqfr_neg = MIN( zqfr , 0._wp ) ! only < 0 161 162 ! --- Sensible ocean-to-ice heat flux (mostly>0 but <0 if supercooling, W/m2) 163 zfric_u = MAX( SQRT( zfric(ji,jj) ), zfric_umin ) 164 qsb_ice_bot(ji,jj) = rswitch * rau0 * rcp * zch * zfric_u * ( ( sst_m(ji,jj) + rt0 ) - t_bo(ji,jj) ) ! W.m-2 165 166 qsb_ice_bot(ji,jj) = rswitch * MIN( qsb_ice_bot(ji,jj), - zqfr_neg * r1_rdtice / MAX( at_i(ji,jj), epsi10 ) ) 167 ! upper bound for qsb_ice_bot: the heat retrieved from the ocean must be smaller than the heat necessary to reach 168 ! the freezing point, so that we do not have SST < T_freeze 169 ! This implies: - ( qsb_ice_bot(ji,jj) * at_i(ji,jj) * rtdice ) - zqfr >= 0 170 171 !-- Energy Budget of the leads (J.m-2), source of ice growth in open water. Must be < 0 to form ice 172 qlead(ji,jj) = MIN( 0._wp , zqld - ( qsb_ice_bot(ji,jj) * at_i(ji,jj) * rdt_ice ) - zqfr ) 173 174 ! If there is ice and leads are warming => transfer energy from the lead budget and use it for bottom melting 175 ! If the grid cell is fully covered by ice (no leads) => transfer energy from the lead budget to the ice bottom budget 176 IF( ( zqld >= 0._wp .AND. at_i(ji,jj) > 0._wp ) .OR. at_i(ji,jj) >= (1._wp - epsi10) ) THEN 177 IF( ln_leadhfx ) THEN ; fhld(ji,jj) = rswitch * zqld * r1_rdtice / MAX( at_i(ji,jj), epsi10 ) ! divided by at_i since this is (re)multiplied by a_i in icethd_dh.F90 178 ELSE ; fhld(ji,jj) = 0._wp 179 ENDIF 180 qlead(ji,jj) = 0._wp 181 ELSE 182 fhld (ji,jj) = 0._wp 139 DO_2D_11_11 140 rswitch = tmask(ji,jj,1) * MAX( 0._wp , SIGN( 1._wp , at_i(ji,jj) - epsi10 ) ) ! 0 if no ice 141 ! 142 ! ! solar irradiance transmission at the mixed layer bottom and used in the lead heat budget 143 ! ! practically no "direct lateral ablation" 144 ! 145 ! ! net downward heat flux from the ice to the ocean, expressed as a function of ocean 146 ! ! temperature and turbulent mixing (McPhee, 1992) 147 ! 148 ! --- Energy received in the lead from atm-oce exchanges, zqld is defined everywhere (J.m-2) --- ! 149 zqld = tmask(ji,jj,1) * rdt_ice * & 150 & ( ( 1._wp - at_i_b(ji,jj) ) * qsr_oce(ji,jj) * frq_m(ji,jj) + & 151 & ( 1._wp - at_i_b(ji,jj) ) * qns_oce(ji,jj) + qemp_oce(ji,jj) ) 152 153 ! --- Energy needed to bring ocean surface layer until its freezing (mostly<0 but >0 if supercooling, J.m-2) --- ! 154 zqfr = rau0 * rcp * e3t_m(ji,jj) * ( t_bo(ji,jj) - ( sst_m(ji,jj) + rt0 ) ) * tmask(ji,jj,1) ! both < 0 (t_bo < sst) and > 0 (t_bo > sst) 155 zqfr_neg = MIN( zqfr , 0._wp ) ! only < 0 156 157 ! --- Sensible ocean-to-ice heat flux (mostly>0 but <0 if supercooling, W/m2) 158 zfric_u = MAX( SQRT( zfric(ji,jj) ), zfric_umin ) 159 qsb_ice_bot(ji,jj) = rswitch * rau0 * rcp * zch * zfric_u * ( ( sst_m(ji,jj) + rt0 ) - t_bo(ji,jj) ) ! W.m-2 160 161 qsb_ice_bot(ji,jj) = rswitch * MIN( qsb_ice_bot(ji,jj), - zqfr_neg * r1_rdtice / MAX( at_i(ji,jj), epsi10 ) ) 162 ! upper bound for qsb_ice_bot: the heat retrieved from the ocean must be smaller than the heat necessary to reach 163 ! the freezing point, so that we do not have SST < T_freeze 164 ! This implies: - ( qsb_ice_bot(ji,jj) * at_i(ji,jj) * rtdice ) - zqfr >= 0 165 166 !-- Energy Budget of the leads (J.m-2), source of ice growth in open water. Must be < 0 to form ice 167 qlead(ji,jj) = MIN( 0._wp , zqld - ( qsb_ice_bot(ji,jj) * at_i(ji,jj) * rdt_ice ) - zqfr ) 168 169 ! If there is ice and leads are warming => transfer energy from the lead budget and use it for bottom melting 170 ! If the grid cell is fully covered by ice (no leads) => transfer energy from the lead budget to the ice bottom budget 171 IF( ( zqld >= 0._wp .AND. at_i(ji,jj) > 0._wp ) .OR. at_i(ji,jj) >= (1._wp - epsi10) ) THEN 172 IF( ln_leadhfx ) THEN ; fhld(ji,jj) = rswitch * zqld * r1_rdtice / MAX( at_i(ji,jj), epsi10 ) ! divided by at_i since this is (re)multiplied by a_i in icethd_dh.F90 173 ELSE ; fhld(ji,jj) = 0._wp 183 174 ENDIF 184 ! 185 ! Net heat flux on top of the ice-ocean [W.m-2] 186 ! --------------------------------------------- 187 qt_atm_oi(ji,jj) = qns_tot(ji,jj) + qsr_tot(ji,jj) 188 END DO 189 END DO 175 qlead(ji,jj) = 0._wp 176 ELSE 177 fhld (ji,jj) = 0._wp 178 ENDIF 179 ! 180 ! Net heat flux on top of the ice-ocean [W.m-2] 181 ! --------------------------------------------- 182 qt_atm_oi(ji,jj) = qns_tot(ji,jj) + qsr_tot(ji,jj) 183 END_2D 190 184 191 185 ! In case we bypass open-water ice formation … … 215 209 ! select ice covered grid points 216 210 npti = 0 ; nptidx(:) = 0 217 DO jj = 1, jpj 218 DO ji = 1, jpi 219 IF ( a_i(ji,jj,jl) > epsi10 ) THEN 220 npti = npti + 1 221 nptidx(npti) = (jj - 1) * jpi + ji 222 ENDIF 223 END DO 224 END DO 211 DO_2D_11_11 212 IF ( a_i(ji,jj,jl) > epsi10 ) THEN 213 npti = npti + 1 214 nptidx(npti) = (jj - 1) * jpi + ji 215 ENDIF 216 END_2D 225 217 226 218 IF( npti > 0 ) THEN ! If there is no ice, do nothing.
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