Changeset 13886 for NEMO/branches/2020/dev_r13541_TOP-01_rlod_Antarctic_ice_Sheet_Fe_Source/src/ICE/icethd.F90
- Timestamp:
- 2020-11-26T15:24:38+01:00 (3 years ago)
- Location:
- NEMO/branches/2020/dev_r13541_TOP-01_rlod_Antarctic_ice_Sheet_Fe_Source
- Files:
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- 2 edited
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. (modified) (1 prop)
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src/ICE/icethd.F90 (modified) (13 diffs)
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NEMO/branches/2020/dev_r13541_TOP-01_rlod_Antarctic_ice_Sheet_Fe_Source
- Property svn:externals
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old new 8 8 9 9 # SETTE 10 ^/utils/CI/sette@135 07sette10 ^/utils/CI/sette@13559 sette
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- Property svn:externals
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NEMO/branches/2020/dev_r13541_TOP-01_rlod_Antarctic_ice_Sheet_Fe_Source/src/ICE/icethd.F90
r13472 r13886 18 18 USE ice ! sea-ice: variables 19 19 !!gm list trop longue ==>>> why not passage en argument d'appel ? 20 USE sbc_oce , ONLY : sss_m, sst_m, e3t_m, utau, vtau, ssu_m, ssv_m, frq_m, qns_tot, qsr_tot,sprecip, ln_cpl20 USE sbc_oce , ONLY : sss_m, sst_m, e3t_m, utau, vtau, ssu_m, ssv_m, frq_m, sprecip, ln_cpl 21 21 USE sbc_ice , ONLY : qsr_oce, qns_oce, qemp_oce, qsr_ice, qns_ice, dqns_ice, evap_ice, qprec_ice, qevap_ice, & 22 22 & qml_ice, qcn_ice, qtr_ice_top … … 30 30 USE icethd_pnd ! sea-ice: melt ponds 31 31 USE iceitd ! sea-ice: remapping thickness distribution 32 USE icecor ! sea-ice: corrections 32 33 USE icetab ! sea-ice: 1D <==> 2D transformation 33 34 USE icevar ! sea-ice: operations … … 52 53 LOGICAL :: ln_icedO ! activate ice growth in open-water (T) or not (F) 53 54 LOGICAL :: ln_icedS ! activate gravity drainage and flushing (T) or not (F) 54 LOGICAL :: ln_leadhfx ! 55 LOGICAL :: ln_leadhfx ! heat in the leads is used to melt sea-ice before warming the ocean 55 56 56 57 !! for convergence tests … … 91 92 ! 92 93 INTEGER :: ji, jj, jk, jl ! dummy loop indices 93 REAL(wp) :: zfric_u, zqld, zqfr, zqfr_neg 94 REAL(wp), PARAMETER :: zfric_umin = 0._wp 95 REAL(wp), PARAMETER :: zch = 0.0057_wp 96 REAL(wp), DIMENSION(jpi,jpj) :: zu_io, zv_io, zfric ! ice-ocean velocity (m/s) and frictional velocity (m2/s2)94 REAL(wp) :: zfric_u, zqld, zqfr, zqfr_neg, zqfr_pos 95 REAL(wp), PARAMETER :: zfric_umin = 0._wp ! lower bound for the friction velocity (cice value=5.e-04) 96 REAL(wp), PARAMETER :: zch = 0.0057_wp ! heat transfer coefficient 97 REAL(wp), DIMENSION(jpi,jpj) :: zu_io, zv_io, zfric, zvel ! ice-ocean velocity (m/s) and frictional velocity (m2/s2) 97 98 ! 98 99 !!------------------------------------------------------------------- … … 124 125 & ( zu_io(ji,jj) * zu_io(ji,jj) + zu_io(ji-1,jj) * zu_io(ji-1,jj) & 125 126 & + zv_io(ji,jj) * zv_io(ji,jj) + zv_io(ji,jj-1) * zv_io(ji,jj-1) ) ) * tmask(ji,jj,1) 127 zvel(ji,jj) = 0.5_wp * SQRT( ( u_ice(ji-1,jj) + u_ice(ji,jj) ) * ( u_ice(ji-1,jj) + u_ice(ji,jj) ) + & 128 & ( v_ice(ji,jj-1) + v_ice(ji,jj) ) * ( v_ice(ji,jj-1) + v_ice(ji,jj) ) ) 126 129 END_2D 127 130 ELSE ! if no ice dynamics => transmit directly the atmospheric stress to the ocean … … 130 133 & ( utau(ji,jj) * utau(ji,jj) + utau(ji-1,jj) * utau(ji-1,jj) & 131 134 & + vtau(ji,jj) * vtau(ji,jj) + vtau(ji,jj-1) * vtau(ji,jj-1) ) ) * tmask(ji,jj,1) 135 zvel(ji,jj) = 0._wp 132 136 END_2D 133 137 ENDIF 134 CALL lbc_lnk ( 'icethd', zfric, 'T',1.0_wp )138 CALL lbc_lnk_multi( 'icethd', zfric, 'T', 1.0_wp, zvel, 'T', 1.0_wp ) 135 139 ! 136 140 !--------------------------------------------------------------------! … … 140 144 rswitch = tmask(ji,jj,1) * MAX( 0._wp , SIGN( 1._wp , at_i(ji,jj) - epsi10 ) ) ! 0 if no ice 141 145 ! 142 ! ! solar irradiance transmission at the mixed layer bottom and used in the lead heat budget143 ! ! practically no "direct lateral ablation"144 !145 ! ! net downward heat flux from the ice to the ocean, expressed as a function of ocean146 ! ! temperature and turbulent mixing (McPhee, 1992)147 !148 146 ! --- Energy received in the lead from atm-oce exchanges, zqld is defined everywhere (J.m-2) --- ! 149 147 zqld = tmask(ji,jj,1) * rDt_ice * & … … 151 149 & ( 1._wp - at_i_b(ji,jj) ) * qns_oce(ji,jj) + qemp_oce(ji,jj) ) 152 150 153 ! --- Energy needed to bring ocean surface layer until its freezing (mostly<0 but >0 if supercooling, J.m-2) --- ! 151 ! --- Energy needed to bring ocean surface layer until its freezing, zqfr is defined everywhere (J.m-2) --- ! 152 ! (mostly<0 but >0 if supercooling) 154 153 zqfr = rho0 * 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) 155 154 zqfr_neg = MIN( zqfr , 0._wp ) ! only < 0 156 157 ! --- Sensible ocean-to-ice heat flux (mostly>0 but <0 if supercooling, W/m2) 155 zqfr_pos = MAX( zqfr , 0._wp ) ! only > 0 156 157 ! --- Sensible ocean-to-ice heat flux (W/m2) --- ! 158 ! (mostly>0 but <0 if supercooling) 158 159 zfric_u = MAX( SQRT( zfric(ji,jj) ), zfric_umin ) 159 qsb_ice_bot(ji,jj) = rswitch * rho0 * 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_Dt_ice / MAX( at_i(ji,jj), epsi10 ) ) 160 qsb_ice_bot(ji,jj) = rswitch * rho0 * rcp * zch * zfric_u * ( ( sst_m(ji,jj) + rt0 ) - t_bo(ji,jj) ) 161 162 162 ! upper bound for qsb_ice_bot: the heat retrieved from the ocean must be smaller than the heat necessary to reach 163 163 ! 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_Dt_ice / 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 174 ENDIF 164 ! This implies: qsb_ice_bot(ji,jj) * at_i(ji,jj) * rtdice <= - zqfr_neg 165 ! The following formulation is ok for both normal conditions and supercooling 166 qsb_ice_bot(ji,jj) = rswitch * MIN( qsb_ice_bot(ji,jj), - zqfr_neg * r1_Dt_ice / MAX( at_i(ji,jj), epsi10 ) ) 167 168 ! --- Energy Budget of the leads (qlead, J.m-2) --- ! 169 ! qlead is the energy received from the atm. in the leads. 170 ! If warming (zqld >= 0), then the energy in the leads is used to melt ice (bottom melting) => fhld (W/m2) 171 ! If cooling (zqld < 0), then the energy in the leads is used to grow ice in open water => qlead (J.m-2) 172 IF( zqld >= 0._wp .AND. at_i(ji,jj) > 0._wp ) THEN 173 ! upper bound for fhld: fhld should be equal to zqld 174 ! but we have to make sure that this heat will not make the sst drop below the freezing point 175 ! so the max heat that can be pulled out of the ocean is zqld - qsb - zqfr_pos 176 ! The following formulation is ok for both normal conditions and supercooling 177 fhld (ji,jj) = rswitch * MAX( 0._wp, ( zqld - zqfr_pos ) * r1_Dt_ice / MAX( at_i(ji,jj), epsi10 ) & ! divided by at_i since this is (re)multiplied by a_i in icethd_dh.F90 178 & - qsb_ice_bot(ji,jj) ) 175 179 qlead(ji,jj) = 0._wp 176 180 ELSE 177 181 fhld (ji,jj) = 0._wp 182 ! upper bound for qlead: qlead should be equal to zqld 183 ! but before using this heat for ice formation, we suppose that the ocean cools down till the freezing point. 184 ! The energy for this cooling down is zqfr. Also some heat will be removed from the ocean from turbulent fluxes (qsb) 185 ! and freezing point is reached if zqfr = zqld - qsb*a/dt 186 ! so the max heat that can be pulled out of the ocean is zqld - qsb - zqfr 187 ! The following formulation is ok for both normal conditions and supercooling 188 qlead(ji,jj) = MIN( 0._wp , zqld - ( qsb_ice_bot(ji,jj) * at_i(ji,jj) * rDt_ice ) - zqfr ) 178 189 ENDIF 179 190 ! 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) 191 ! If ice is landfast and ice concentration reaches its max 192 ! => stop ice formation in open water 193 IF( zvel(ji,jj) <= 5.e-04_wp .AND. at_i(ji,jj) >= rn_amax_2d(ji,jj)-epsi06 ) qlead(ji,jj) = 0._wp 194 ! 195 ! If the grid cell is almost fully covered by ice (no leads) 196 ! => stop ice formation in open water 197 IF( at_i(ji,jj) >= (1._wp - epsi10) ) qlead(ji,jj) = 0._wp 198 ! 199 ! If ln_leadhfx is false 200 ! => do not use energy of the leads to melt sea-ice 201 IF( .NOT.ln_leadhfx ) fhld(ji,jj) = 0._wp 202 ! 183 203 END_2D 184 204 … … 191 211 ENDIF 192 212 193 ! ---------------------------------------------------------------------194 ! Net heat flux on top of the ocean after ice thermo (1st step) [W.m-2]195 ! ---------------------------------------------------------------------196 ! First step here : non solar + precip - qlead - qsensible197 ! Second step in icethd_dh : heat remaining if total melt (zq_rema)198 ! Third step in iceupdate.F90 : heat from ice-ocean mass exchange (zf_mass) + solar199 qt_oce_ai(:,:) = ( 1._wp - at_i_b(:,:) ) * qns_oce(:,:) + qemp_oce(:,:) & ! Non solar heat flux received by the ocean200 & - qlead(:,:) * r1_Dt_ice & ! heat flux taken from the ocean where there is open water ice formation201 & - at_i (:,:) * qsb_ice_bot(:,:) & ! heat flux taken by sensible flux202 & - at_i (:,:) * fhld (:,:) ! heat flux taken during bottom growth/melt203 ! ! (fhld should be 0 while bott growth)204 213 !-------------------------------------------------------------------------------------------! 205 214 ! Thermodynamic computation (only on grid points covered by ice) => loop over ice categories … … 231 240 CALL ice_thd_dh ! Ice-Snow thickness 232 241 CALL ice_thd_pnd ! Melt ponds formation 233 CALL ice_thd_ent( e_i_1d(1:npti,:) , .true.) ! Ice enthalpy remapping242 CALL ice_thd_ent( e_i_1d(1:npti,:) ) ! Ice enthalpy remapping 234 243 ENDIF 235 244 CALL ice_thd_sal( ln_icedS ) ! --- Ice salinity --- ! … … 254 263 ! 255 264 IF( ln_icedO ) CALL ice_thd_do ! --- Frazil ice growth in leads --- ! 265 ! 266 CALL ice_cor( kt , 2 ) ! --- Corrections --- ! 267 ! 268 oa_i(:,:,:) = oa_i(:,:,:) + a_i(:,:,:) * rdt_ice ! ice natural aging incrementation 256 269 ! 257 270 ! convergence tests … … 418 431 CALL tab_2d_1d( npti, nptidx(1:npti), hfx_res_1d (1:npti), hfx_res ) 419 432 CALL tab_2d_1d( npti, nptidx(1:npti), hfx_err_dif_1d(1:npti), hfx_err_dif ) 420 CALL tab_2d_1d( npti, nptidx(1:npti), qt_oce_ai_1d (1:npti), qt_oce_ai )421 433 ! 422 434 ! ocean surface fields 423 435 CALL tab_2d_1d( npti, nptidx(1:npti), sst_1d(1:npti), sst_m ) 424 436 CALL tab_2d_1d( npti, nptidx(1:npti), sss_1d(1:npti), sss_m ) 437 CALL tab_2d_1d( npti, nptidx(1:npti), frq_m_1d(1:npti), frq_m ) 425 438 ! 426 439 ! to update ice age … … 510 523 CALL tab_1d_2d( npti, nptidx(1:npti), hfx_res_1d (1:npti), hfx_res ) 511 524 CALL tab_1d_2d( npti, nptidx(1:npti), hfx_err_dif_1d(1:npti), hfx_err_dif ) 512 CALL tab_1d_2d( npti, nptidx(1:npti), qt_oce_ai_1d (1:npti), qt_oce_ai )513 525 ! 514 526 CALL tab_1d_2d( npti, nptidx(1:npti), qns_ice_1d (1:npti), qns_ice (:,:,kl) )
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