Changeset 5086 for branches/2014/dev_r4650_UKMO3_masked_damping/NEMOGCM/NEMO/LIM_SRC_3/limthd_dh.F90
- Timestamp:
- 2015-02-17T10:06:39+01:00 (9 years ago)
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branches/2014/dev_r4650_UKMO3_masked_damping/NEMOGCM/NEMO/LIM_SRC_3/limthd_dh.F90
r4333 r5086 6 6 !! History : LIM ! 2003-05 (M. Vancoppenolle) Original code in 1D 7 7 !! ! 2005-06 (M. Vancoppenolle) 3D version 8 !! 3.2 ! 2009-07 (M. Vancoppenolle, Y. Aksenov, G. Madec) bug correction in rdm_snw & rdm_ice8 !! 3.2 ! 2009-07 (M. Vancoppenolle, Y. Aksenov, G. Madec) bug correction in wfx_snw & wfx_ice 9 9 !! 3.4 ! 2011-02 (G. Madec) dynamical allocation 10 10 !! 3.5 ! 2012-10 (G. Madec & co) salt flux + bug fixes … … 26 26 USE wrk_nemo ! work arrays 27 27 USE lib_fortran ! Fortran utilities (allows no signed zero when 'key_nosignedzero' defined) 28 28 29 29 IMPLICIT NONE 30 30 PRIVATE 31 31 32 32 PUBLIC lim_thd_dh ! called by lim_thd 33 34 REAL(wp) :: epsi20 = 1.e-20 ! constant values35 REAL(wp) :: epsi10 = 1.e-10 !36 REAL(wp) :: epsi13 = 1.e-13 !37 REAL(wp) :: zzero = 0._wp !38 REAL(wp) :: zone = 1._wp !39 33 40 34 !!---------------------------------------------------------------------- … … 45 39 CONTAINS 46 40 47 SUBROUTINE lim_thd_dh( kideb, kiut , jl)41 SUBROUTINE lim_thd_dh( kideb, kiut ) 48 42 !!------------------------------------------------------------------ 49 43 !! *** ROUTINE lim_thd_dh *** … … 70 64 !!------------------------------------------------------------------ 71 65 INTEGER , INTENT(in) :: kideb, kiut ! Start/End point on which the the computation is applied 72 INTEGER , INTENT(in) :: jl ! Thickness cateogry number73 66 !! 74 67 INTEGER :: ji , jk ! dummy loop indices 75 68 INTEGER :: ii, ij ! 2D corresponding indices to ji 76 INTEGER :: isnow ! switch for presence (1) or absence (0) of snow77 INTEGER :: isnowic ! snow ice formation not78 INTEGER :: i_ice_switch ! ice thickness above a certain treshold or not79 69 INTEGER :: iter 80 70 81 REAL(wp) :: zzfmass_i, zihgnew ! local scalar 82 REAL(wp) :: zzfmass_s, zhsnew, ztmelts ! local scalar 83 REAL(wp) :: zhn, zdhcf, zdhbf, zhni, zhnfi, zihg ! 84 REAL(wp) :: zdhnm, zhnnew, zhisn, zihic, zzc ! 71 REAL(wp) :: ztmelts ! local scalar 72 REAL(wp) :: zdh, zfdum ! 85 73 REAL(wp) :: zfracs ! fractionation coefficient for bottom salt entrapment 86 74 REAL(wp) :: zcoeff ! dummy argument for snowfall partitioning over ice and leads 87 REAL(wp) :: zs m_snowice! snow-ice salinity75 REAL(wp) :: zs_snic ! snow-ice salinity 88 76 REAL(wp) :: zswi1 ! switch for computation of bottom salinity 89 77 REAL(wp) :: zswi12 ! switch for computation of bottom salinity 90 78 REAL(wp) :: zswi2 ! switch for computation of bottom salinity 91 79 REAL(wp) :: zgrr ! bottom growth rate 92 REAL(wp) :: ztform ! bottom formation temperature 93 ! 94 REAL(wp), POINTER, DIMENSION(:) :: zh_i ! ice layer thickness 80 REAL(wp) :: zt_i_new ! bottom formation temperature 81 82 REAL(wp) :: zQm ! enthalpy exchanged with the ocean (J/m2), >0 towards the ocean 83 REAL(wp) :: zEi ! specific enthalpy of sea ice (J/kg) 84 REAL(wp) :: zEw ! specific enthalpy of exchanged water (J/kg) 85 REAL(wp) :: zdE ! specific enthalpy difference (J/kg) 86 REAL(wp) :: zfmdt ! exchange mass flux x time step (J/m2), >0 towards the ocean 87 REAL(wp) :: zsstK ! SST in Kelvin 88 95 89 REAL(wp), POINTER, DIMENSION(:) :: zh_s ! snow layer thickness 96 REAL(wp), POINTER, DIMENSION(:) :: ztfs ! melting point 97 REAL(wp), POINTER, DIMENSION(:) :: zhsold ! old snow thickness 98 REAL(wp), POINTER, DIMENSION(:) :: zqprec ! energy of fallen snow 99 REAL(wp), POINTER, DIMENSION(:) :: zqfont_su ! incoming, remaining surface energy 100 REAL(wp), POINTER, DIMENSION(:) :: zqfont_bo ! incoming, bottom energy 101 REAL(wp), POINTER, DIMENSION(:) :: z_f_surf ! surface heat for ablation 102 REAL(wp), POINTER, DIMENSION(:) :: zhgnew ! new ice thickness 103 REAL(wp), POINTER, DIMENSION(:) :: zfmass_i ! 90 REAL(wp), POINTER, DIMENSION(:) :: zqprec ! energy of fallen snow (J.m-3) 91 REAL(wp), POINTER, DIMENSION(:) :: zq_su ! heat for surface ablation (J.m-2) 92 REAL(wp), POINTER, DIMENSION(:) :: zq_bo ! heat for bottom ablation (J.m-2) 93 REAL(wp), POINTER, DIMENSION(:) :: zq_1cat ! corrected heat in case 1-cat and hmelt>15cm (J.m-2) 94 REAL(wp), POINTER, DIMENSION(:) :: zq_rema ! remaining heat at the end of the routine (J.m-2) 95 REAL(wp), POINTER, DIMENSION(:) :: zf_tt ! Heat budget to determine melting or freezing(W.m-2) 96 INTEGER , POINTER, DIMENSION(:) :: icount ! number of layers vanished by melting 104 97 105 98 REAL(wp), POINTER, DIMENSION(:) :: zdh_s_mel ! snow melt … … 108 101 109 102 REAL(wp), POINTER, DIMENSION(:,:) :: zdeltah 110 111 ! Pathological cases 112 REAL(wp), POINTER, DIMENSION(:) :: zfdt_init ! total incoming heat for ice melt 113 REAL(wp), POINTER, DIMENSION(:) :: zfdt_final ! total remaing heat for ice melt 114 REAL(wp), POINTER, DIMENSION(:) :: zqt_i ! total ice heat content 115 REAL(wp), POINTER, DIMENSION(:) :: zqt_s ! total snow heat content 116 REAL(wp), POINTER, DIMENSION(:) :: zqt_dummy ! dummy heat content 117 118 REAL(wp), POINTER, DIMENSION(:,:) :: zqt_i_lay ! total ice heat content 103 REAL(wp), POINTER, DIMENSION(:,:) :: zh_i ! ice layer thickness 104 105 REAL(wp), POINTER, DIMENSION(:) :: zqh_i ! total ice heat content (J.m-2) 106 REAL(wp), POINTER, DIMENSION(:) :: zqh_s ! total snow heat content (J.m-2) 107 REAL(wp), POINTER, DIMENSION(:) :: zq_s ! total snow enthalpy (J.m-3) 119 108 120 109 ! mass and salt flux (clem) 121 REAL(wp) :: zdvres, zdvsur, zdvbot 122 REAL(wp), POINTER, DIMENSION(:) :: zviold, zvsold ! old ice volume... 110 REAL(wp) :: zdvres, zswitch_sal 123 111 124 112 ! Heat conservation 125 INTEGER :: num_iter_max, numce_dh 126 REAL(wp) :: meance_dh 127 REAL(wp) :: zinda 128 REAL(wp), POINTER, DIMENSION(:) :: zinnermelt 129 REAL(wp), POINTER, DIMENSION(:) :: zfbase, zdq_i 113 INTEGER :: num_iter_max 114 130 115 !!------------------------------------------------------------------ 131 116 132 CALL wrk_alloc( jpij, zh_i, zh_s, ztfs, zhsold, zqprec, zqfont_su, zqfont_bo, z_f_surf, zhgnew, zfmass_i ) 133 CALL wrk_alloc( jpij, zdh_s_mel, zdh_s_pre, zdh_s_sub, zfdt_init, zfdt_final, zqt_i, zqt_s, zqt_dummy ) 134 CALL wrk_alloc( jpij, zinnermelt, zfbase, zdq_i ) 135 CALL wrk_alloc( jpij, jkmax, zdeltah, zqt_i_lay ) 136 137 CALL wrk_alloc( jpij, zviold, zvsold ) ! clem 117 ! Discriminate between varying salinity (num_sal=2) and prescribed cases (other values) 118 SELECT CASE( num_sal ) ! varying salinity or not 119 CASE( 1, 3, 4 ) ; zswitch_sal = 0 ! prescribed salinity profile 120 CASE( 2 ) ; zswitch_sal = 1 ! varying salinity profile 121 END SELECT 122 123 CALL wrk_alloc( jpij, zh_s, zqprec, zq_su, zq_bo, zf_tt, zq_1cat, zq_rema ) 124 CALL wrk_alloc( jpij, zdh_s_mel, zdh_s_pre, zdh_s_sub, zqh_i, zqh_s, zq_s ) 125 CALL wrk_alloc( jpij, nlay_i+1, zdeltah, zh_i ) 126 CALL wrk_alloc( jpij, icount ) 138 127 139 ftotal_fin(:) = 0._wp 140 zfdt_init (:) = 0._wp 141 zfdt_final(:) = 0._wp 142 143 dh_i_surf (:) = 0._wp 144 dh_i_bott (:) = 0._wp 145 dh_snowice(:) = 0._wp 146 147 DO ji = kideb, kiut 148 old_ht_i_b(ji) = ht_i_b(ji) 149 old_ht_s_b(ji) = ht_s_b(ji) 150 zviold(ji) = a_i_b(ji) * ht_i_b(ji) ! clem 151 zvsold(ji) = a_i_b(ji) * ht_s_b(ji) ! clem 152 END DO 128 dh_i_surf (:) = 0._wp ; dh_i_bott (:) = 0._wp ; dh_snowice(:) = 0._wp 129 dsm_i_se_1d(:) = 0._wp ; dsm_i_si_1d(:) = 0._wp 130 131 zqprec (:) = 0._wp ; zq_su (:) = 0._wp ; zq_bo (:) = 0._wp ; zf_tt (:) = 0._wp 132 zq_1cat(:) = 0._wp ; zq_rema(:) = 0._wp 133 134 zh_s (:) = 0._wp 135 zdh_s_pre(:) = 0._wp 136 zdh_s_mel(:) = 0._wp 137 zdh_s_sub(:) = 0._wp 138 zqh_s (:) = 0._wp 139 zqh_i (:) = 0._wp 140 141 zh_i (:,:) = 0._wp 142 zdeltah (:,:) = 0._wp 143 icount (:) = 0 144 145 ! initialize layer thicknesses and enthalpies 146 h_i_old (:,0:nlay_i+1) = 0._wp 147 qh_i_old(:,0:nlay_i+1) = 0._wp 148 DO jk = 1, nlay_i 149 DO ji = kideb, kiut 150 h_i_old (ji,jk) = ht_i_1d(ji) / REAL( nlay_i ) 151 qh_i_old(ji,jk) = q_i_1d(ji,jk) * h_i_old(ji,jk) 152 ENDDO 153 ENDDO 153 154 ! 154 155 !------------------------------------------------------------------------------! 155 ! 1) Calculate available heat for surface a blation!156 ! 1) Calculate available heat for surface and bottom ablation ! 156 157 !------------------------------------------------------------------------------! 157 158 ! 158 159 DO ji = kideb, kiut 159 isnow = INT( 1.0 - MAX( 0.0 , SIGN( 1.0 , - ht_s_b(ji) ) ) ) 160 ztfs (ji) = isnow * rtt + ( 1.0 - isnow ) * rtt 161 z_f_surf (ji) = qnsr_ice_1d(ji) + ( 1.0 - i0(ji) ) * qsr_ice_1d(ji) - fc_su(ji) 162 z_f_surf (ji) = MAX( zzero , z_f_surf(ji) ) * MAX( zzero , SIGN( zone , t_su_b(ji) - ztfs(ji) ) ) 163 zfdt_init(ji) = ( z_f_surf(ji) + MAX( fbif_1d(ji) + qlbbq_1d(ji) + fc_bo_i(ji),0.0 ) ) * rdt_ice 164 END DO ! ji 165 166 zqfont_su (:) = 0._wp 167 zqfont_bo (:) = 0._wp 168 dsm_i_se_1d(:) = 0._wp 169 dsm_i_si_1d(:) = 0._wp 160 rswitch = 1._wp - MAX( 0._wp , SIGN( 1._wp , - ht_s_1d(ji) ) ) 161 ztmelts = rswitch * rtt + ( 1._wp - rswitch ) * rtt 162 163 zfdum = qns_ice_1d(ji) + ( 1._wp - i0(ji) ) * qsr_ice_1d(ji) - fc_su(ji) 164 zf_tt(ji) = fc_bo_i(ji) + fhtur_1d(ji) + fhld_1d(ji) 165 166 zq_su (ji) = MAX( 0._wp, zfdum * rdt_ice ) * MAX( 0._wp , SIGN( 1._wp, t_su_1d(ji) - ztmelts ) ) 167 zq_bo (ji) = MAX( 0._wp, zf_tt(ji) * rdt_ice ) 168 END DO 169 170 170 ! 171 171 !------------------------------------------------------------------------------! 172 ! 2) Computing layer thicknesses and snow and sea-ice enthalpies. ! 172 ! If snow temperature is above freezing point, then snow melts 173 ! (should not happen but sometimes it does) 173 174 !------------------------------------------------------------------------------! 174 ! 175 DO ji = kideb, kiut ! Layer thickness 176 zh_i(ji) = ht_i_b(ji) / REAL( nlay_i ) 177 zh_s(ji) = ht_s_b(ji) / REAL( nlay_s ) 178 END DO 179 ! 180 zqt_s(:) = 0._wp ! Total enthalpy of the snow 175 DO ji = kideb, kiut 176 IF( t_s_1d(ji,1) > rtt ) THEN !!! Internal melting 177 ! Contribution to heat flux to the ocean [W.m-2], < 0 178 hfx_res_1d(ji) = hfx_res_1d(ji) + q_s_1d(ji,1) * ht_s_1d(ji) * a_i_1d(ji) * r1_rdtice 179 ! Contribution to mass flux 180 wfx_snw_1d(ji) = wfx_snw_1d(ji) + rhosn * ht_s_1d(ji) * a_i_1d(ji) * r1_rdtice 181 ! updates 182 ht_s_1d(ji) = 0._wp 183 q_s_1d (ji,1) = 0._wp 184 t_s_1d (ji,1) = rtt 185 END IF 186 END DO 187 188 !------------------------------------------------------------! 189 ! 2) Computing layer thicknesses and enthalpies. ! 190 !------------------------------------------------------------! 191 ! 192 DO ji = kideb, kiut 193 zh_s(ji) = ht_s_1d(ji) / REAL( nlay_s ) 194 END DO 195 ! 181 196 DO jk = 1, nlay_s 182 197 DO ji = kideb, kiut 183 zq t_s(ji) = zqt_s(ji) + q_s_b(ji,jk) * ht_s_b(ji) / REAL( nlay_s)198 zqh_s(ji) = zqh_s(ji) + q_s_1d(ji,jk) * zh_s(ji) 184 199 END DO 185 200 END DO 186 201 ! 187 zqt_i(:) = 0._wp ! Total enthalpy of the ice188 202 DO jk = 1, nlay_i 189 203 DO ji = kideb, kiut 190 zzc = q_i_b(ji,jk) * ht_i_b(ji) / REAL( nlay_i ) 191 zqt_i(ji) = zqt_i(ji) + zzc 192 zqt_i_lay(ji,jk) = zzc 204 zh_i(ji,jk) = ht_i_1d(ji) / REAL( nlay_i ) 205 zqh_i(ji) = zqh_i(ji) + q_i_1d(ji,jk) * zh_i(ji,jk) 193 206 END DO 194 207 END DO … … 212 225 ! Martin Vancoppenolle, December 2006 213 226 214 ! Snow fall 215 DO ji = kideb, kiut 216 zcoeff = ( 1.0 - ( 1.0 - at_i_b(ji) )**betas ) / at_i_b(ji) 227 DO ji = kideb, kiut 228 !----------- 229 ! Snow fall 230 !----------- 231 ! thickness change 232 zcoeff = ( 1._wp - ( 1._wp - at_i_1d(ji) )**betas ) / at_i_1d(ji) 217 233 zdh_s_pre(ji) = zcoeff * sprecip_1d(ji) * rdt_ice / rhosn 218 END DO 219 zdh_s_mel(:) = 0._wp 220 221 ! Melt of fallen snow 222 DO ji = kideb, kiut 223 ! tatm_ice is now in K 224 zqprec (ji) = rhosn * ( cpic * ( rtt - tatm_ice_1d(ji) ) + lfus ) 225 zqfont_su(ji) = z_f_surf(ji) * rdt_ice 226 zdeltah (ji,1) = MIN( 0.e0 , - zqfont_su(ji) / MAX( zqprec(ji) , epsi13 ) ) 227 zqfont_su(ji) = MAX( 0.e0 , - zdh_s_pre(ji) - zdeltah(ji,1) ) * zqprec(ji) 228 zdeltah (ji,1) = MAX( - zdh_s_pre(ji) , zdeltah(ji,1) ) 229 zdh_s_mel(ji) = zdh_s_mel(ji) + zdeltah(ji,1) 230 ! heat conservation 231 qt_s_in(ji,jl) = qt_s_in(ji,jl) + zqprec(ji) * zdh_s_pre(ji) 232 zqt_s (ji) = zqt_s (ji) + zqprec(ji) * zdh_s_pre(ji) 233 zqt_s (ji) = MAX( zqt_s(ji) - zqfont_su(ji) , 0.e0 ) 234 END DO 235 236 237 ! Snow melt due to surface heat imbalance 234 ! enthalpy of the precip (>0, J.m-3) (tatm_ice is now in K) 235 zqprec (ji) = rhosn * ( cpic * ( rtt - MIN( tatm_ice_1d(ji), rt0_snow) ) + lfus ) 236 IF( sprecip_1d(ji) == 0._wp ) zqprec(ji) = 0._wp 237 ! heat flux from snow precip (>0, W.m-2) 238 hfx_spr_1d(ji) = hfx_spr_1d(ji) + zdh_s_pre(ji) * a_i_1d(ji) * zqprec(ji) * r1_rdtice 239 ! mass flux, <0 240 wfx_spr_1d(ji) = wfx_spr_1d(ji) - rhosn * a_i_1d(ji) * zdh_s_pre(ji) * r1_rdtice 241 ! update thickness 242 ht_s_1d (ji) = MAX( 0._wp , ht_s_1d(ji) + zdh_s_pre(ji) ) 243 244 !--------------------- 245 ! Melt of falling snow 246 !--------------------- 247 ! thickness change 248 IF( zdh_s_pre(ji) > 0._wp ) THEN 249 rswitch = 1._wp - MAX( 0._wp , SIGN( 1._wp , - zqprec(ji) + epsi20 ) ) 250 zdh_s_mel (ji) = - rswitch * zq_su(ji) / MAX( zqprec(ji) , epsi20 ) 251 zdh_s_mel (ji) = MAX( - zdh_s_pre(ji), zdh_s_mel(ji) ) ! bound melting 252 ! heat used to melt snow (W.m-2, >0) 253 hfx_snw_1d(ji) = hfx_snw_1d(ji) - zdh_s_mel(ji) * a_i_1d(ji) * zqprec(ji) * r1_rdtice 254 ! snow melting only = water into the ocean (then without snow precip), >0 255 wfx_snw_1d(ji) = wfx_snw_1d(ji) - rhosn * a_i_1d(ji) * zdh_s_mel(ji) * r1_rdtice 256 257 ! updates available heat + thickness 258 zq_su (ji) = MAX( 0._wp , zq_su (ji) + zdh_s_mel(ji) * zqprec(ji) ) 259 ht_s_1d(ji) = MAX( 0._wp , ht_s_1d(ji) + zdh_s_mel(ji) ) 260 zh_s (ji) = ht_s_1d(ji) / REAL( nlay_s ) 261 262 ENDIF 263 END DO 264 265 ! If heat still available, then melt more snow 266 zdeltah(:,:) = 0._wp ! important 238 267 DO jk = 1, nlay_s 239 268 DO ji = kideb, kiut 240 zdeltah (ji,jk) = - zqfont_su(ji) / q_s_b(ji,jk) 241 zqfont_su(ji) = MAX( 0.0 , - zh_s(ji) - zdeltah(ji,jk) ) * q_s_b(ji,jk) 242 zdeltah (ji,jk) = MAX( zdeltah(ji,jk) , - zh_s(ji) ) 243 zdh_s_mel(ji) = zdh_s_mel(ji) + zdeltah(ji,jk) ! resulting melt of snow 269 ! thickness change 270 rswitch = 1._wp - MAX( 0._wp, SIGN( 1._wp, - ht_s_1d(ji) ) ) 271 rswitch = rswitch * ( 1._wp - MAX( 0._wp, SIGN( 1._wp, - q_s_1d(ji,jk) + epsi20 ) ) ) 272 zdeltah (ji,jk) = - rswitch * zq_su(ji) / MAX( q_s_1d(ji,jk), epsi20 ) 273 zdeltah (ji,jk) = MAX( zdeltah(ji,jk) , - zh_s(ji) ) ! bound melting 274 zdh_s_mel(ji) = zdh_s_mel(ji) + zdeltah(ji,jk) 275 ! heat used to melt snow(W.m-2, >0) 276 hfx_snw_1d(ji) = hfx_snw_1d(ji) - zdeltah(ji,jk) * a_i_1d(ji) * q_s_1d(ji,jk) * r1_rdtice 277 ! snow melting only = water into the ocean (then without snow precip) 278 wfx_snw_1d(ji) = wfx_snw_1d(ji) - rhosn * a_i_1d(ji) * zdeltah(ji,jk) * r1_rdtice 279 280 ! updates available heat + thickness 281 zq_su (ji) = MAX( 0._wp , zq_su (ji) + zdeltah(ji,jk) * q_s_1d(ji,jk) ) 282 ht_s_1d(ji) = MAX( 0._wp , ht_s_1d(ji) + zdeltah(ji,jk) ) 283 244 284 END DO 245 285 END DO 246 286 247 ! Apply snow melt to snow depth 248 DO ji = kideb, kiut 249 dh_s_tot(ji) = zdh_s_mel(ji) + zdh_s_pre(ji) 250 ! Old and new snow depths 251 zhsold(ji) = ht_s_b(ji) 252 zhsnew = ht_s_b(ji) + dh_s_tot(ji) 253 ! If snow is still present zhn = 1, else zhn = 0 254 zhn = 1.0 - MAX( zzero , SIGN( zone , - zhsnew ) ) 255 ht_s_b(ji) = MAX( zzero , zhsnew ) 256 ! we recompute dh_s_tot (clem) 257 dh_s_tot (ji) = ht_s_b(ji) - zhsold(ji) 258 ! Volume and mass variations of snow 259 dvsbq_1d (ji) = a_i_b(ji) * ( ht_s_b(ji) - zhsold(ji) - zdh_s_pre(ji) ) 260 dvsbq_1d (ji) = MIN( zzero, dvsbq_1d(ji) ) 261 !clem rdm_snw_1d(ji) = rdm_snw_1d(ji) + rhosn * dvsbq_1d(ji) 287 !---------------------- 288 ! 3.2 Snow sublimation 289 !---------------------- 290 ! qla_ice is always >=0 (upwards), heat goes to the atmosphere, therefore snow sublimates 291 ! clem comment: not counted in mass exchange in limsbc since this is an exchange with atm. (not ocean) 292 ! clem comment: ice should also sublimate 293 IF( lk_cpl ) THEN 294 ! coupled mode: sublimation already included in emp_ice (to do in limsbc_ice) 295 zdh_s_sub(:) = 0._wp 296 ELSE 297 ! forced mode: snow thickness change due to sublimation 298 DO ji = kideb, kiut 299 zdh_s_sub(ji) = MAX( - ht_s_1d(ji) , - parsub * qla_ice_1d(ji) / ( rhosn * lsub ) * rdt_ice ) 300 ! Heat flux by sublimation [W.m-2], < 0 301 ! sublimate first snow that had fallen, then pre-existing snow 302 zcoeff = ( MAX( zdh_s_sub(ji), - MAX( 0._wp, zdh_s_pre(ji) + zdh_s_mel(ji) ) ) * zqprec(ji) + & 303 & ( zdh_s_sub(ji) - MAX( zdh_s_sub(ji), - MAX( 0._wp, zdh_s_pre(ji) + zdh_s_mel(ji) ) ) ) * q_s_1d(ji,1) ) & 304 & * a_i_1d(ji) * r1_rdtice 305 hfx_sub_1d(ji) = hfx_sub_1d(ji) + zcoeff 306 ! Mass flux by sublimation 307 wfx_sub_1d(ji) = wfx_sub_1d(ji) - rhosn * a_i_1d(ji) * zdh_s_sub(ji) * r1_rdtice 308 ! new snow thickness 309 ht_s_1d(ji) = MAX( 0._wp , ht_s_1d(ji) + zdh_s_sub(ji) ) 310 END DO 311 ENDIF 312 313 ! --- Update snow diags --- ! 314 DO ji = kideb, kiut 315 dh_s_tot(ji) = zdh_s_mel(ji) + zdh_s_pre(ji) + zdh_s_sub(ji) 316 zh_s(ji) = ht_s_1d(ji) / REAL( nlay_s ) 262 317 END DO ! ji 263 318 319 !------------------------------------------- 320 ! 3.3 Update temperature, energy 321 !------------------------------------------- 322 ! new temp and enthalpy of the snow (remaining snow precip + remaining pre-existing snow) 323 zq_s(:) = 0._wp 324 DO jk = 1, nlay_s 325 DO ji = kideb,kiut 326 rswitch = MAX( 0._wp , SIGN( 1._wp, - ht_s_1d(ji) + epsi20 ) ) 327 q_s_1d(ji,jk) = ( 1._wp - rswitch ) / MAX( ht_s_1d(ji), epsi20 ) * & 328 & ( ( MAX( 0._wp, dh_s_tot(ji) ) ) * zqprec(ji) + & 329 & ( - MAX( 0._wp, dh_s_tot(ji) ) + ht_s_1d(ji) ) * rhosn * ( cpic * ( rtt - t_s_1d(ji,jk) ) + lfus ) ) 330 zq_s(ji) = zq_s(ji) + q_s_1d(ji,jk) 331 END DO 332 END DO 333 264 334 !-------------------------- 265 ! 3. 2Surface ice ablation335 ! 3.4 Surface ice ablation 266 336 !-------------------------- 267 DO ji = kideb, kiut 268 z_f_surf (ji) = zqfont_su(ji) * r1_rdtice ! heat conservation test 269 zdq_i (ji) = 0._wp 270 END DO ! ji 271 337 zdeltah(:,:) = 0._wp ! important 272 338 DO jk = 1, nlay_i 273 339 DO ji = kideb, kiut 274 ! ! melt of layer jk 275 zdeltah (ji,jk) = - zqfont_su(ji) / q_i_b(ji,jk) 276 ! ! recompute heat available 277 zqfont_su(ji ) = MAX( 0.0 , - zh_i(ji) - zdeltah(ji,jk) ) * q_i_b(ji,jk) 278 ! ! melt of layer jk cannot be higher than its thickness 279 zdeltah (ji,jk) = MAX( zdeltah(ji,jk) , - zh_i(ji) ) 280 ! ! update surface melt 281 dh_i_surf(ji ) = dh_i_surf(ji) + zdeltah(ji,jk) 282 ! ! for energy conservation 283 zdq_i (ji ) = zdq_i(ji) + zdeltah(ji,jk) * q_i_b(ji,jk) * r1_rdtice 284 ! 285 ! clem 286 sfx_thd_1d(ji) = sfx_thd_1d(ji) - sm_i_b(ji) * a_i_b(ji) & 287 & * MIN( zdeltah(ji,jk) , 0._wp ) * rhoic / rdt_ice 340 zEi = - q_i_1d(ji,jk) / rhoic ! Specific enthalpy of layer k [J/kg, <0] 341 342 ztmelts = - tmut * s_i_1d(ji,jk) + rtt ! Melting point of layer k [K] 343 344 zEw = rcp * ( ztmelts - rt0 ) ! Specific enthalpy of resulting meltwater [J/kg, <0] 345 346 zdE = zEi - zEw ! Specific enthalpy difference < 0 347 348 zfmdt = - zq_su(ji) / zdE ! Mass flux to the ocean [kg/m2, >0] 349 350 zdeltah(ji,jk) = - zfmdt / rhoic ! Melt of layer jk [m, <0] 351 352 zdeltah(ji,jk) = MIN( 0._wp , MAX( zdeltah(ji,jk) , - zh_i(ji,jk) ) ) ! Melt of layer jk cannot exceed the layer thickness [m, <0] 353 354 zq_su(ji) = MAX( 0._wp , zq_su(ji) - zdeltah(ji,jk) * rhoic * zdE ) ! update available heat 355 356 dh_i_surf(ji) = dh_i_surf(ji) + zdeltah(ji,jk) ! Cumulate surface melt 357 358 zfmdt = - rhoic * zdeltah(ji,jk) ! Recompute mass flux [kg/m2, >0] 359 360 zQm = zfmdt * zEw ! Energy of the melt water sent to the ocean [J/m2, <0] 361 362 ! Contribution to salt flux (clem: using sm_i_1d and not s_i_1d(jk) is ok) 363 sfx_sum_1d(ji) = sfx_sum_1d(ji) - sm_i_1d(ji) * a_i_1d(ji) * zdeltah(ji,jk) * rhoic * r1_rdtice 364 365 ! Contribution to heat flux [W.m-2], < 0 366 hfx_thd_1d(ji) = hfx_thd_1d(ji) + zfmdt * a_i_1d(ji) * zEw * r1_rdtice 367 368 ! Total heat flux used in this process [W.m-2], > 0 369 hfx_sum_1d(ji) = hfx_sum_1d(ji) - zfmdt * a_i_1d(ji) * zdE * r1_rdtice 370 371 ! Contribution to mass flux 372 wfx_sum_1d(ji) = wfx_sum_1d(ji) - rhoic * a_i_1d(ji) * zdeltah(ji,jk) * r1_rdtice 373 374 ! record which layers have disappeared (for bottom melting) 375 ! => icount=0 : no layer has vanished 376 ! => icount=5 : 5 layers have vanished 377 rswitch = MAX( 0._wp , SIGN( 1._wp , - ( zh_i(ji,jk) + zdeltah(ji,jk) ) ) ) 378 icount(ji) = icount(ji) + NINT( rswitch ) 379 zh_i(ji,jk) = MAX( 0._wp , zh_i(ji,jk) + zdeltah(ji,jk) ) 380 381 ! update heat content (J.m-2) and layer thickness 382 qh_i_old(ji,jk) = qh_i_old(ji,jk) + zdeltah(ji,jk) * q_i_1d(ji,jk) 383 h_i_old (ji,jk) = h_i_old (ji,jk) + zdeltah(ji,jk) 288 384 END DO 289 385 END DO 290 291 ! !------------------- 292 IF( con_i .AND. jiindex_1d > 0 ) THEN ! Conservation test 293 ! !------------------- 294 numce_dh = 0 295 meance_dh = 0._wp 296 DO ji = kideb, kiut 297 IF ( ( z_f_surf(ji) + zdq_i(ji) ) .GE. 1.0e-3 ) THEN 298 numce_dh = numce_dh + 1 299 meance_dh = meance_dh + z_f_surf(ji) + zdq_i(ji) 300 ENDIF 301 IF( z_f_surf(ji) + zdq_i(ji) .GE. 1.0e-3 ) THEN! 302 WRITE(numout,*) ' ALERTE heat loss for surface melt ' 303 WRITE(numout,*) ' ii, ij, jl :', ii, ij, jl 304 WRITE(numout,*) ' ht_i_b : ', ht_i_b(ji) 305 WRITE(numout,*) ' z_f_surf : ', z_f_surf(ji) 306 WRITE(numout,*) ' zdq_i : ', zdq_i(ji) 307 WRITE(numout,*) ' ht_i_b : ', ht_i_b(ji) 308 WRITE(numout,*) ' fc_bo_i : ', fc_bo_i(ji) 309 WRITE(numout,*) ' fbif_1d : ', fbif_1d(ji) 310 WRITE(numout,*) ' qlbbq_1d : ', qlbbq_1d(ji) 311 WRITE(numout,*) ' s_i_new : ', s_i_new(ji) 312 WRITE(numout,*) ' sss_m : ', sss_m(ii,ij) 313 ENDIF 314 END DO 315 ! 316 IF( numce_dh > 0 ) meance_dh = meance_dh / numce_dh 317 WRITE(numout,*) ' Error report - Category : ', jl 318 WRITE(numout,*) ' ~~~~~~~~~~~~ ' 319 WRITE(numout,*) ' Number of points where there is sur. me. error : ', numce_dh 320 WRITE(numout,*) ' Mean basal growth error on error points : ', meance_dh 321 ! 322 ENDIF 323 324 !---------------------- 325 ! 3.3 Snow sublimation 326 !---------------------- 327 328 DO ji = kideb, kiut 329 ! qla_ice is always >=0 (upwards), heat goes to the atmosphere, therefore snow sublimates 330 #if defined key_coupled 331 zdh_s_sub(ji) = 0._wp ! coupled mode: sublimation already included in emp_ice (to do in limsbc_ice) 332 #else 333 ! ! forced mode: snow thickness change due to sublimation 334 zdh_s_sub(ji) = - parsub * qla_ice_1d(ji) / ( rhosn * lsub ) * rdt_ice 335 #endif 336 dh_s_tot (ji) = dh_s_tot(ji) + zdh_s_sub(ji) 337 zdhcf = ht_s_b(ji) + zdh_s_sub(ji) 338 ht_s_b (ji) = MAX( zzero , zdhcf ) 339 ! we recompute dh_s_tot 340 dh_s_tot (ji) = ht_s_b(ji) - zhsold(ji) 341 qt_s_in (ji,jl) = qt_s_in(ji,jl) + zdh_s_sub(ji)*q_s_b(ji,1) 342 END DO 343 344 zqt_dummy(:) = 0.e0 345 DO jk = 1, nlay_s 346 DO ji = kideb,kiut 347 q_s_b (ji,jk) = rhosn * ( cpic * ( rtt - t_s_b(ji,jk) ) + lfus ) 348 zqt_dummy(ji) = zqt_dummy(ji) + q_s_b(ji,jk) * ht_s_b(ji) / REAL( nlay_s ) ! heat conservation 349 END DO 350 END DO 351 352 DO jk = 1, nlay_s 353 DO ji = kideb, kiut 354 ! In case of disparition of the snow, we have to update the snow temperatures 355 zhisn = MAX( zzero , SIGN( zone, - ht_s_b(ji) ) ) 356 t_s_b(ji,jk) = ( 1.0 - zhisn ) * t_s_b(ji,jk) + zhisn * rtt 357 q_s_b(ji,jk) = ( 1.0 - zhisn ) * q_s_b(ji,jk) 358 END DO 386 ! update ice thickness 387 DO ji = kideb, kiut 388 ht_i_1d(ji) = MAX( 0._wp , ht_i_1d(ji) + dh_i_surf(ji) ) 359 389 END DO 360 390 … … 364 394 !------------------------------------------------------------------------------! 365 395 ! 366 ! Ice basal growth / melt is given by the ratio of heat budget over basal 367 ! ice heat content. Basal heat budget is given by the difference between 368 ! the inner conductive flux (fc_bo_i), from the open water heat flux 369 ! (qlbbqb) and the turbulent ocean flux (fbif). 370 ! fc_bo_i is positive downwards. fbif and qlbbq are positive to the ice 371 372 !----------------------------------------------------- 373 ! 4.1 Basal growth - (a) salinity not varying in time 374 !----------------------------------------------------- 375 IF( num_sal /= 2 ) THEN ! ice salinity constant in time 396 !------------------ 397 ! 4.1 Basal growth 398 !------------------ 399 ! Basal growth is driven by heat imbalance at the ice-ocean interface, 400 ! between the inner conductive flux (fc_bo_i), from the open water heat flux 401 ! (fhld) and the turbulent ocean flux (fhtur). 402 ! fc_bo_i is positive downwards. fhtur and fhld are positive to the ice 403 404 ! If salinity varies in time, an iterative procedure is required, because 405 ! the involved quantities are inter-dependent. 406 ! Basal growth (dh_i_bott) depends upon new ice specific enthalpy (zEi), 407 ! which depends on forming ice salinity (s_i_new), which depends on dh/dt (dh_i_bott) 408 ! -> need for an iterative procedure, which converges quickly 409 410 IF ( num_sal == 2 ) THEN 411 num_iter_max = 5 412 ELSE 413 num_iter_max = 1 414 ENDIF 415 416 !clem debug. Just to be sure that enthalpy at nlay_i+1 is null 417 DO ji = kideb, kiut 418 q_i_1d(ji,nlay_i+1) = 0._wp 419 END DO 420 421 ! Iterative procedure 422 DO iter = 1, num_iter_max 376 423 DO ji = kideb, kiut 377 IF( ( fc_bo_i(ji) + fbif_1d(ji) + qlbbq_1d(ji) ) < 0._wp ) THEN 378 s_i_new(ji) = sm_i_b(ji) 379 ! Melting point in K 380 ztmelts = - tmut * s_i_new(ji) + rtt 381 ! New ice heat content (Bitz and Lipscomb, 1999) 382 ztform = t_i_b(ji,nlay_i) ! t_bo_b crashes in the 383 ! Baltic 384 q_i_b(ji,nlay_i+1) = rhoic * ( cpic * ( ztmelts - ztform ) & 385 & + lfus * ( 1.0 - ( ztmelts - rtt ) / ( ztform - rtt ) ) & 386 & - rcp * ( ztmelts - rtt ) ) 387 ! Basal growth rate = - F*dt / q 388 dh_i_bott(ji) = - rdt_ice * ( fc_bo_i(ji) + fbif_1d(ji) + qlbbq_1d(ji) ) / q_i_b(ji,nlay_i+1) 389 sfx_thd_1d(ji) = sfx_thd_1d(ji) - s_i_new(ji) * a_i_b(ji) * dh_i_bott(ji) * rhoic * r1_rdtice 390 ENDIF 391 END DO 392 ENDIF 393 394 !------------------------------------------------- 395 ! 4.1 Basal growth - (b) salinity varying in time 396 !------------------------------------------------- 397 IF( num_sal == 2 ) THEN 398 ! the growth rate (dh_i_bott) is function of the new ice heat content (q_i_b(nlay_i+1)). 399 ! q_i_b depends on the new ice salinity (snewice). 400 ! snewice depends on dh_i_bott ; it converges quickly, so, no problem 401 ! See Vancoppenolle et al., OM08 for more info on this 402 403 ! Initial value (tested 1D, can be anything between 1 and 20) 404 num_iter_max = 4 405 s_i_new(:) = 4.0 406 407 ! Iterative procedure 408 DO iter = 1, num_iter_max 409 DO ji = kideb, kiut 410 IF( fc_bo_i(ji) + fbif_1d(ji) + qlbbq_1d(ji) < 0.e0 ) THEN 411 ii = MOD( npb(ji) - 1, jpi ) + 1 412 ij = ( npb(ji) - 1 ) / jpi + 1 413 ! Melting point in K 414 ztmelts = - tmut * s_i_new(ji) + rtt 415 ! New ice heat content (Bitz and Lipscomb, 1999) 416 q_i_b(ji,nlay_i+1) = rhoic * ( cpic * ( ztmelts - t_bo_b(ji) ) & 417 & + lfus * ( 1.0 - ( ztmelts - rtt ) / ( t_bo_b(ji) - rtt ) ) & 418 & - rcp * ( ztmelts-rtt ) ) 419 ! Bottom growth rate = - F*dt / q 420 dh_i_bott(ji) = - rdt_ice * ( fc_bo_i(ji) + fbif_1d(ji) + qlbbq_1d(ji) ) / q_i_b(ji,nlay_i+1) 421 ! New ice salinity ( Cox and Weeks, JGR, 1988 ) 422 ! zswi2 (1) if dh_i_bott/rdt .GT. 3.6e-7 423 ! zswi12 (1) if dh_i_bott/rdt .LT. 3.6e-7 and .GT. 2.0e-8 424 ! zswi1 (1) if dh_i_bott/rdt .LT. 2.0e-8 425 zgrr = MIN( 1.0e-3, MAX ( dh_i_bott(ji) * r1_rdtice , epsi13 ) ) 426 zswi2 = MAX( zzero , SIGN( zone , zgrr - 3.6e-7 ) ) 427 zswi12 = MAX( zzero , SIGN( zone , zgrr - 2.0e-8 ) ) * ( 1.0 - zswi2 ) 428 zswi1 = 1. - zswi2 * zswi12 429 zfracs = zswi1 * 0.12 + zswi12 * ( 0.8925 + 0.0568 * LOG( 100.0 * zgrr ) ) & 430 & + zswi2 * 0.26 / ( 0.26 + 0.74 * EXP ( - 724300.0 * zgrr ) ) 431 zfracs = MIN( 0.5 , zfracs ) 432 s_i_new(ji) = zfracs * sss_m(ii,ij) 433 ENDIF ! fc_bo_i 434 END DO ! ji 435 END DO ! iter 436 437 ! Final values 438 DO ji = kideb, kiut 439 IF( ( fc_bo_i(ji) + fbif_1d(ji) + qlbbq_1d(ji) ) .LT. 0.0 ) THEN 440 ! New ice salinity must not exceed 20 psu 441 s_i_new(ji) = MIN( s_i_new(ji), s_i_max ) 442 ! Metling point in K 443 ztmelts = - tmut * s_i_new(ji) + rtt 444 ! New ice heat content (Bitz and Lipscomb, 1999) 445 q_i_b(ji,nlay_i+1) = rhoic * ( cpic * ( ztmelts - t_bo_b(ji) ) & 446 & + lfus * ( 1.0 - ( ztmelts - rtt ) / ( t_bo_b(ji) - rtt ) ) & 447 & - rcp * ( ztmelts - rtt ) ) 448 ! Basal growth rate = - F*dt / q 449 dh_i_bott(ji) = - rdt_ice * ( fc_bo_i(ji) + fbif_1d(ji) + qlbbq_1d(ji) ) / q_i_b(ji,nlay_i+1) 450 ! Salinity update 451 ! entrapment during bottom growth 452 sfx_thd_1d(ji) = sfx_thd_1d(ji) - s_i_new(ji) * a_i_b(ji) * dh_i_bott(ji) * rhoic * r1_rdtice 453 ENDIF ! heat budget 454 END DO 455 ENDIF 424 IF( zf_tt(ji) < 0._wp ) THEN 425 426 ! New bottom ice salinity (Cox & Weeks, JGR88 ) 427 !--- zswi1 if dh/dt < 2.0e-8 428 !--- zswi12 if 2.0e-8 < dh/dt < 3.6e-7 429 !--- zswi2 if dh/dt > 3.6e-7 430 zgrr = MIN( 1.0e-3, MAX ( dh_i_bott(ji) * r1_rdtice , epsi10 ) ) 431 zswi2 = MAX( 0._wp , SIGN( 1._wp , zgrr - 3.6e-7 ) ) 432 zswi12 = MAX( 0._wp , SIGN( 1._wp , zgrr - 2.0e-8 ) ) * ( 1.0 - zswi2 ) 433 zswi1 = 1. - zswi2 * zswi12 434 zfracs = MIN ( zswi1 * 0.12 + zswi12 * ( 0.8925 + 0.0568 * LOG( 100.0 * zgrr ) ) & 435 & + zswi2 * 0.26 / ( 0.26 + 0.74 * EXP ( - 724300.0 * zgrr ) ) , 0.5 ) 436 437 ii = MOD( npb(ji) - 1, jpi ) + 1 ; ij = ( npb(ji) - 1 ) / jpi + 1 438 439 s_i_new(ji) = zswitch_sal * zfracs * sss_m(ii,ij) & ! New ice salinity 440 + ( 1. - zswitch_sal ) * sm_i_1d(ji) 441 ! New ice growth 442 ztmelts = - tmut * s_i_new(ji) + rtt ! New ice melting point (K) 443 444 zt_i_new = zswitch_sal * t_bo_1d(ji) + ( 1. - zswitch_sal) * t_i_1d(ji, nlay_i) 445 446 zEi = cpic * ( zt_i_new - ztmelts ) & ! Specific enthalpy of forming ice (J/kg, <0) 447 & - lfus * ( 1.0 - ( ztmelts - rtt ) / ( zt_i_new - rtt ) ) & 448 & + rcp * ( ztmelts-rtt ) 449 450 zEw = rcp * ( t_bo_1d(ji) - rt0 ) ! Specific enthalpy of seawater (J/kg, < 0) 451 452 zdE = zEi - zEw ! Specific enthalpy difference (J/kg, <0) 453 454 dh_i_bott(ji) = rdt_ice * MAX( 0._wp , zf_tt(ji) / ( zdE * rhoic ) ) 455 456 q_i_1d(ji,nlay_i+1) = -zEi * rhoic ! New ice energy of melting (J/m3, >0) 457 458 ENDIF ! fc_bo_i 459 END DO ! ji 460 END DO ! iter 461 462 ! Contribution to Energy and Salt Fluxes 463 DO ji = kideb, kiut 464 IF( zf_tt(ji) < 0._wp ) THEN 465 ! New ice growth 466 467 zfmdt = - rhoic * dh_i_bott(ji) ! Mass flux x time step (kg/m2, < 0) 468 469 ztmelts = - tmut * s_i_new(ji) + rtt ! New ice melting point (K) 470 471 zt_i_new = zswitch_sal * t_bo_1d(ji) + ( 1. - zswitch_sal) * t_i_1d(ji, nlay_i) 472 473 zEi = cpic * ( zt_i_new - ztmelts ) & ! Specific enthalpy of forming ice (J/kg, <0) 474 & - lfus * ( 1.0 - ( ztmelts - rtt ) / ( zt_i_new - rtt ) ) & 475 & + rcp * ( ztmelts-rtt ) 476 477 zEw = rcp * ( t_bo_1d(ji) - rt0 ) ! Specific enthalpy of seawater (J/kg, < 0) 478 479 zdE = zEi - zEw ! Specific enthalpy difference (J/kg, <0) 480 481 ! Contribution to heat flux to the ocean [W.m-2], >0 482 hfx_thd_1d(ji) = hfx_thd_1d(ji) + zfmdt * a_i_1d(ji) * zEw * r1_rdtice 483 484 ! Total heat flux used in this process [W.m-2], <0 485 hfx_bog_1d(ji) = hfx_bog_1d(ji) - zfmdt * a_i_1d(ji) * zdE * r1_rdtice 486 487 ! Contribution to salt flux, <0 488 sfx_bog_1d(ji) = sfx_bog_1d(ji) + s_i_new(ji) * a_i_1d(ji) * zfmdt * r1_rdtice 489 490 ! Contribution to mass flux, <0 491 wfx_bog_1d(ji) = wfx_bog_1d(ji) - rhoic * a_i_1d(ji) * dh_i_bott(ji) * r1_rdtice 492 493 ! update heat content (J.m-2) and layer thickness 494 qh_i_old(ji,nlay_i+1) = qh_i_old(ji,nlay_i+1) + dh_i_bott(ji) * q_i_1d(ji,nlay_i+1) 495 h_i_old (ji,nlay_i+1) = h_i_old (ji,nlay_i+1) + dh_i_bott(ji) 496 ENDIF 497 END DO 456 498 457 499 !---------------- 458 500 ! 4.2 Basal melt 459 501 !---------------- 460 meance_dh = 0._wp 461 numce_dh = 0 462 zinnermelt(:) = 0._wp 463 464 DO ji = kideb, kiut 465 ! heat convergence at the surface > 0 466 IF( ( fc_bo_i(ji) + fbif_1d(ji) + qlbbq_1d(ji) ) >= 0._wp ) THEN 467 s_i_new(ji) = s_i_b(ji,nlay_i) 468 zqfont_bo(ji) = rdt_ice * ( fc_bo_i(ji) + fbif_1d(ji) + qlbbq_1d(ji) ) 469 zfbase(ji) = zqfont_bo(ji) * r1_rdtice ! heat conservation test 470 zdq_i(ji) = 0._wp 471 dh_i_bott(ji) = 0._wp 472 ENDIF 473 END DO 474 502 zdeltah(:,:) = 0._wp ! important 475 503 DO jk = nlay_i, 1, -1 476 504 DO ji = kideb, kiut 477 IF( fc_bo_i(ji) + fbif_1d(ji) + qlbbq_1d(ji) >= 0._wp ) THEN 478 ztmelts = - tmut * s_i_b(ji,jk) + rtt 479 IF( t_i_b(ji,jk) >= ztmelts ) THEN !!gm : a comment is needed 480 zdeltah (ji,jk) = - zh_i(ji) 481 dh_i_bott (ji ) = dh_i_bott(ji) + zdeltah(ji,jk) 482 zinnermelt(ji ) = 1._wp 483 ELSE ! normal ablation 484 zdeltah (ji,jk) = - zqfont_bo(ji) / q_i_b(ji,jk) 485 zqfont_bo(ji ) = MAX( 0.0 , - zh_i(ji) - zdeltah(ji,jk) ) * q_i_b(ji,jk) 486 zdeltah (ji,jk) = MAX(zdeltah(ji,jk), - zh_i(ji) ) 487 dh_i_bott(ji ) = dh_i_bott(ji) + zdeltah(ji,jk) 488 zdq_i (ji ) = zdq_i(ji) + zdeltah(ji,jk) * q_i_b(ji,jk) * r1_rdtice 505 IF( zf_tt(ji) >= 0._wp .AND. jk > icount(ji) ) THEN ! do not calculate where layer has already disappeared from surface melting 506 507 ztmelts = - tmut * s_i_1d(ji,jk) + rtt ! Melting point of layer jk (K) 508 509 IF( t_i_1d(ji,jk) >= ztmelts ) THEN !!! Internal melting 510 511 zEi = - q_i_1d(ji,jk) / rhoic ! Specific enthalpy of melting ice (J/kg, <0) 512 513 !!zEw = rcp * ( t_i_1d(ji,jk) - rtt ) ! Specific enthalpy of meltwater at T = t_i_1d (J/kg, <0) 514 515 zdE = 0._wp ! Specific enthalpy difference (J/kg, <0) 516 ! set up at 0 since no energy is needed to melt water...(it is already melted) 517 518 zdeltah (ji,jk) = MIN( 0._wp , - zh_i(ji,jk) ) ! internal melting occurs when the internal temperature is above freezing 519 ! this should normally not happen, but sometimes, heat diffusion leads to this 520 521 dh_i_bott (ji) = dh_i_bott(ji) + zdeltah(ji,jk) 522 523 zfmdt = - zdeltah(ji,jk) * rhoic ! Mass flux x time step > 0 524 525 ! Contribution to heat flux to the ocean [W.m-2], <0 (ice enthalpy zEi is "sent" to the ocean) 526 hfx_res_1d(ji) = hfx_res_1d(ji) + zfmdt * a_i_1d(ji) * zEi * r1_rdtice 527 528 ! Contribution to salt flux (clem: using sm_i_1d and not s_i_1d(jk) is ok) 529 sfx_res_1d(ji) = sfx_res_1d(ji) - sm_i_1d(ji) * a_i_1d(ji) * zdeltah(ji,jk) * rhoic * r1_rdtice 530 531 ! Contribution to mass flux 532 wfx_res_1d(ji) = wfx_res_1d(ji) - rhoic * a_i_1d(ji) * zdeltah(ji,jk) * r1_rdtice 533 534 ! update heat content (J.m-2) and layer thickness 535 qh_i_old(ji,jk) = qh_i_old(ji,jk) + zdeltah(ji,jk) * q_i_1d(ji,jk) 536 h_i_old (ji,jk) = h_i_old (ji,jk) + zdeltah(ji,jk) 537 538 ELSE !!! Basal melting 539 540 zEi = - q_i_1d(ji,jk) / rhoic ! Specific enthalpy of melting ice (J/kg, <0) 541 542 zEw = rcp * ( ztmelts - rtt )! Specific enthalpy of meltwater (J/kg, <0) 543 544 zdE = zEi - zEw ! Specific enthalpy difference (J/kg, <0) 545 546 zfmdt = - zq_bo(ji) / zdE ! Mass flux x time step (kg/m2, >0) 547 548 zdeltah(ji,jk) = - zfmdt / rhoic ! Gross thickness change 549 550 zdeltah(ji,jk) = MIN( 0._wp , MAX( zdeltah(ji,jk), - zh_i(ji,jk) ) ) ! bound thickness change 551 552 zq_bo(ji) = MAX( 0._wp , zq_bo(ji) - zdeltah(ji,jk) * rhoic * zdE ) ! update available heat. MAX is necessary for roundup errors 553 554 dh_i_bott(ji) = dh_i_bott(ji) + zdeltah(ji,jk) ! Update basal melt 555 556 zfmdt = - zdeltah(ji,jk) * rhoic ! Mass flux x time step > 0 557 558 zQm = zfmdt * zEw ! Heat exchanged with ocean 559 560 ! Contribution to heat flux to the ocean [W.m-2], <0 561 hfx_thd_1d(ji) = hfx_thd_1d(ji) + zfmdt * a_i_1d(ji) * zEw * r1_rdtice 562 563 ! Contribution to salt flux (clem: using sm_i_1d and not s_i_1d(jk) is ok) 564 sfx_bom_1d(ji) = sfx_bom_1d(ji) - sm_i_1d(ji) * a_i_1d(ji) * zdeltah(ji,jk) * rhoic * r1_rdtice 565 566 ! Total heat flux used in this process [W.m-2], >0 567 hfx_bom_1d(ji) = hfx_bom_1d(ji) - zfmdt * a_i_1d(ji) * zdE * r1_rdtice 568 569 ! Contribution to mass flux 570 wfx_bom_1d(ji) = wfx_bom_1d(ji) - rhoic * a_i_1d(ji) * zdeltah(ji,jk) * r1_rdtice 571 572 ! update heat content (J.m-2) and layer thickness 573 qh_i_old(ji,jk) = qh_i_old(ji,jk) + zdeltah(ji,jk) * q_i_1d(ji,jk) 574 h_i_old (ji,jk) = h_i_old (ji,jk) + zdeltah(ji,jk) 489 575 ENDIF 490 ! clem: contribution to salt flux 491 sfx_thd_1d(ji) = sfx_thd_1d(ji) - sm_i_b(ji) * a_i_b(ji) & 492 & * MIN( zdeltah(ji,jk) , 0._wp ) * rhoic * r1_rdtice 576 493 577 ENDIF 494 578 END DO ! ji 495 579 END DO ! jk 496 580 497 ! !-------------------498 IF( con_i .AND. jiindex_1d > 0 ) THEN ! Conservation test499 ! !-------------------500 DO ji = kideb, kiut501 IF( ( fc_bo_i(ji) + fbif_1d(ji) + qlbbq_1d(ji) ) >= 0.e0 ) THEN502 IF( ( zfbase(ji) + zdq_i(ji) ) >= 1.e-3 ) THEN503 numce_dh = numce_dh + 1504 meance_dh = meance_dh + zfbase(ji) + zdq_i(ji)505 ENDIF506 IF ( zfbase(ji) + zdq_i(ji) .GE. 1.0e-3 ) THEN507 WRITE(numout,*) ' ALERTE heat loss for basal melt : ii, ij, jl :', ii, ij, jl508 WRITE(numout,*) ' ht_i_b : ', ht_i_b(ji)509 WRITE(numout,*) ' zfbase : ', zfbase(ji)510 WRITE(numout,*) ' zdq_i : ', zdq_i(ji)511 WRITE(numout,*) ' ht_i_b : ', ht_i_b(ji)512 WRITE(numout,*) ' fc_bo_i : ', fc_bo_i(ji)513 WRITE(numout,*) ' fbif_1d : ', fbif_1d(ji)514 WRITE(numout,*) ' qlbbq_1d : ', qlbbq_1d(ji)515 WRITE(numout,*) ' s_i_new : ', s_i_new(ji)516 WRITE(numout,*) ' sss_m : ', sss_m(ii,ij)517 WRITE(numout,*) ' dh_i_bott : ', dh_i_bott(ji)518 WRITE(numout,*) ' innermelt : ', INT( zinnermelt(ji) )519 ENDIF520 ENDIF521 END DO522 IF( numce_dh > 0 ) meance_dh = meance_dh / numce_dh523 WRITE(numout,*) ' Number of points where there is bas. me. error : ', numce_dh524 WRITE(numout,*) ' Mean basal melt error on error points : ', meance_dh525 WRITE(numout,*) ' Remaining bottom heat : ', zqfont_bo(jiindex_1d)526 !527 ENDIF528 529 !530 581 !------------------------------------------------------------------------------! 531 ! 5) Pathological cases ! 582 ! Excessive ablation in a 1-category model 583 ! in a 1-category sea ice model, bottom ablation must not exceed hmelt (-0.15) 532 584 !------------------------------------------------------------------------------! 533 ! 534 !---------------------------------------------- 535 ! 5.1 Excessive ablation in a 1-category model 536 !---------------------------------------------- 537 538 DO ji = kideb, kiut 539 ! ! in a 1-category sea ice model, bottom ablation must not exceed hmelt (-0.15) 540 IF( jpl == 1 ) THEN ; zdhbf = MAX( hmelt , dh_i_bott(ji) ) 541 ELSE ; zdhbf = dh_i_bott(ji) 542 ENDIF 543 zdvres = zdhbf - dh_i_bott(ji) 544 dh_i_bott(ji) = zdhbf 545 sfx_thd_1d(ji) = sfx_thd_1d(ji) - sm_i_b(ji) * a_i_b(ji) * zdvres * rhoic * r1_rdtice 546 ! ! excessive energy is sent to lateral ablation 547 zinda = MAX( 0._wp, SIGN( 1._wp , 1.0 - at_i_b(ji) - epsi10 ) ) 548 fsup(ji) = zinda * rhoic * lfus * at_i_b(ji) / MAX( 1.0 - at_i_b(ji) , epsi10 ) * zdvres * r1_rdtice 549 END DO 550 551 !----------------------------------- 552 ! 5.2 More than available ice melts 553 !----------------------------------- 554 ! then heat applied minus heat content at previous time step should equal heat remaining 555 ! 556 DO ji = kideb, kiut 557 ! Adapt the remaining energy if too much ice melts 558 !-------------------------------------------------- 559 zdvres = MAX( 0._wp, - ht_i_b(ji) - dh_i_surf(ji) - dh_i_bott(ji) ) 560 zdvsur = MIN( 0._wp, dh_i_surf(ji) + zdvres ) - dh_i_surf(ji) ! fill the surface first 561 zdvbot = MAX( 0._wp, zdvres - zdvsur ) ! then the bottom 562 dh_i_surf (ji) = dh_i_surf(ji) + zdvsur ! clem 563 dh_i_bott (ji) = dh_i_bott(ji) + zdvbot ! clem 564 565 ! new ice thickness (clem) 566 zhgnew(ji) = ht_i_b(ji) + dh_i_surf(ji) + dh_i_bott(ji) 567 zihgnew = 1.0 - MAX( zzero , SIGN( zone , - zhgnew(ji) ) ) !1 if ice 568 zhgnew(ji) = zihgnew * zhgnew(ji) ! ice thickness is put to 0 569 570 ! !since ice volume is only used for outputs, we keep it global for all categories 571 dvbbq_1d (ji) = a_i_b(ji) * dh_i_bott(ji) 572 573 ! remaining heat 574 zfdt_final(ji) = ( 1.0 - zihgnew ) * ( zqfont_su(ji) + zqfont_bo(ji) ) 575 576 ! If snow remains, energy is used to melt snow 577 zhni = ht_s_b(ji) ! snow depth at previous time step 578 zihg = MAX( zzero , SIGN ( zone , - ht_s_b(ji) ) ) ! =0 if snow 579 580 ! energy of melting of remaining snow 581 zinda = MAX( 0._wp, SIGN( 1._wp , zhni - epsi10 ) ) 582 zqt_s(ji) = ( 1. - zihg ) * zqt_s(ji) / MAX( zhni, epsi10 ) * zinda 583 zdhnm = - ( 1. - zihg ) * ( 1. - zihgnew ) * zfdt_final(ji) / MAX( zqt_s(ji) , epsi13 ) 584 zhnfi = zhni + zdhnm 585 zfdt_final(ji) = MAX( zfdt_final(ji) + zqt_s(ji) * zdhnm , 0.0 ) 586 ht_s_b(ji) = MAX( zzero , zhnfi ) 587 zqt_s(ji) = zqt_s(ji) * ht_s_b(ji) 588 ! we recompute dh_s_tot (clem) 589 dh_s_tot (ji) = ht_s_b(ji) - zhsold(ji) 590 591 ! Mass variations of ice and snow 592 !--------------------------------- 593 ! ! mass variation of the jl category 594 zzfmass_s = - a_i_b(ji) * ( zhni - ht_s_b(ji) ) * rhosn ! snow 595 zzfmass_i = a_i_b(ji) * ( zhgnew(ji) - ht_i_b(ji) ) * rhoic ! ice 596 ! 597 zfmass_i(ji) = zzfmass_i ! ice variation saved to compute salt flux (see below) 598 ! 599 ! ! mass variation cumulated over category 600 !clem rdm_snw_1d(ji) = rdm_snw_1d(ji) + zzfmass_s ! snow 601 !clem rdm_ice_1d(ji) = rdm_ice_1d(ji) + zzfmass_i ! ice 602 603 ! Remaining heat to the ocean 604 !--------------------------------- 605 focea(ji) = - zfdt_final(ji) * r1_rdtice ! focea is in W.m-2 * dt 606 607 ! residual salt flux (clem) 608 !-------------------------- 609 ! surface 610 sfx_thd_1d(ji) = sfx_thd_1d(ji) - sm_i_b(ji) * a_i_b(ji) * zdvsur * rhoic * r1_rdtice 611 ! bottom 612 IF ( fc_bo_i(ji) + fbif_1d(ji) + qlbbq_1d(ji) >= 0._wp ) THEN ! melting 613 sfx_thd_1d(ji) = sfx_thd_1d(ji) - sm_i_b(ji) * a_i_b(ji) * zdvbot * rhoic * r1_rdtice 614 ELSE ! growth 615 sfx_thd_1d(ji) = sfx_thd_1d(ji) - s_i_new(ji) * a_i_b(ji) * zdvbot * rhoic * r1_rdtice 616 ENDIF 617 ! 618 ! diagnostic 619 ii = MOD( npb(ji) - 1, jpi ) + 1 620 ij = ( npb(ji) - 1 ) / jpi + 1 621 diag_bot_gr(ii,ij) = diag_bot_gr(ii,ij) + MAX(dh_i_bott(ji),0.0)*a_i_b(ji) * r1_rdtice 622 diag_sur_me(ii,ij) = diag_sur_me(ii,ij) + MIN(dh_i_surf(ji),0.0)*a_i_b(ji) * r1_rdtice 623 diag_bot_me(ii,ij) = diag_bot_me(ii,ij) + MIN(dh_i_bott(ji),0.0)*a_i_b(ji) * r1_rdtice 624 END DO 625 626 ftotal_fin (:) = zfdt_final(:) * r1_rdtice 627 628 !--------------------------- 629 ! heat fluxes 630 !--------------------------- 631 DO ji = kideb, kiut 632 zihgnew = 1.0 - MAX( zzero , SIGN( zone , - zhgnew(ji) ) ) ! =1 if ice 633 ! 634 ! Heat flux 635 ! excessive bottom ablation energy (fsup) - 0 except if jpl = 1 636 ! excessive total ablation energy (focea) sent to the ocean 637 qfvbq_1d(ji) = qfvbq_1d(ji) + fsup(ji) + ( 1.0 - zihgnew ) * focea(ji) * a_i_b(ji) * rdt_ice 638 639 zihic = 1.0 - MAX( zzero , SIGN( zone , -ht_i_b(ji) ) ) ! equals 0 if ht_i = 0, 1 if ht_i gt 0 640 fscbq_1d(ji) = a_i_b(ji) * fstbif_1d(ji) 641 qldif_1d(ji) = qldif_1d(ji) + fsup(ji) + ( 1.0 - zihgnew ) * focea (ji) * a_i_b(ji) * rdt_ice & 642 & + ( 1.0 - zihic ) * fscbq_1d(ji) * rdt_ice 643 END DO ! ji 644 645 !------------------------------------------- 646 ! Correct temperature, energy and thickness 647 !------------------------------------------- 648 DO ji = kideb, kiut 649 zihgnew = 1.0 - MAX( zzero , SIGN( zone , - zhgnew(ji) ) ) 650 t_su_b(ji) = zihgnew * t_su_b(ji) + ( 1.0 - zihgnew ) * rtt 651 END DO ! ji 652 653 DO jk = 1, nlay_i 654 DO ji = kideb, kiut 655 zihgnew = 1.0 - MAX( zzero , SIGN( zone , - zhgnew(ji) ) ) 656 t_i_b(ji,jk) = zihgnew * t_i_b(ji,jk) + ( 1.0 - zihgnew ) * rtt 657 q_i_b(ji,jk) = zihgnew * q_i_b(ji,jk) 658 END DO 659 END DO ! ji 660 661 DO ji = kideb, kiut 662 ht_i_b(ji) = zhgnew(ji) 663 END DO ! ji 585 ! ??? keep ??? 586 ! clem bug: I think this should be included above, so we would not have to 587 ! track heat/salt/mass fluxes backwards 588 ! IF( jpl == 1 ) THEN 589 ! DO ji = kideb, kiut 590 ! IF( zf_tt(ji) >= 0._wp ) THEN 591 ! zdh = MAX( hmelt , dh_i_bott(ji) ) 592 ! zdvres = zdh - dh_i_bott(ji) ! >=0 593 ! dh_i_bott(ji) = zdh 594 ! 595 ! ! excessive energy is sent to lateral ablation 596 ! rswitch = MAX( 0._wp, SIGN( 1._wp , 1._wp - at_i_1d(ji) - epsi20 ) ) 597 ! zq_1cat(ji) = rswitch * rhoic * lfus * at_i_1d(ji) / MAX( 1._wp - at_i_1d(ji) , epsi20 ) * zdvres ! J.m-2 >=0 598 ! 599 ! ! correct salt and mass fluxes 600 ! sfx_bom_1d(ji) = sfx_bom_1d(ji) - sm_i_1d(ji) * a_i_1d(ji) * zdvres * rhoic * r1_rdtice ! this is only a raw approximation 601 ! wfx_bom_1d(ji) = wfx_bom_1d(ji) - rhoic * a_i_1d(ji) * zdvres * r1_rdtice 602 ! ENDIF 603 ! END DO 604 ! ENDIF 605 606 !------------------------------------------- 607 ! Update temperature, energy 608 !------------------------------------------- 609 DO ji = kideb, kiut 610 ht_i_1d(ji) = MAX( 0._wp , ht_i_1d(ji) + dh_i_bott(ji) ) 611 END DO 612 613 !------------------------------------------- 614 ! 5. What to do with remaining energy 615 !------------------------------------------- 616 ! If heat still available for melting and snow remains, then melt more snow 617 !------------------------------------------- 618 zdeltah(:,:) = 0._wp ! important 619 DO ji = kideb, kiut 620 zq_rema(ji) = zq_su(ji) + zq_bo(ji) 621 ! zindh = 1._wp - MAX( 0._wp, SIGN( 1._wp, - ht_s_1d(ji) ) ) ! =1 if snow 622 ! zindq = 1._wp - MAX( 0._wp, SIGN( 1._wp, - zq_s(ji) + epsi20 ) ) 623 ! zdeltah (ji,1) = - zindh * zindq * zq_rema(ji) / MAX( zq_s(ji), epsi20 ) 624 ! zdeltah (ji,1) = MIN( 0._wp , MAX( zdeltah(ji,1) , - ht_s_1d(ji) ) ) ! bound melting 625 ! zdh_s_mel(ji) = zdh_s_mel(ji) + zdeltah(ji,1) 626 ! dh_s_tot (ji) = dh_s_tot(ji) + zdeltah(ji,1) 627 ! ht_s_1d (ji) = ht_s_1d(ji) + zdeltah(ji,1) 628 ! 629 ! zq_rema(ji) = zq_rema(ji) + zdeltah(ji,1) * zq_s(ji) ! update available heat (J.m-2) 630 ! ! heat used to melt snow 631 ! hfx_snw_1d(ji) = hfx_snw_1d(ji) - zdeltah(ji,1) * a_i_1d(ji) * zq_s(ji) * r1_rdtice ! W.m-2 (>0) 632 ! ! Contribution to mass flux 633 ! wfx_snw_1d(ji) = wfx_snw_1d(ji) - rhosn * a_i_1d(ji) * zdeltah(ji,1) * r1_rdtice 634 ! 635 ii = MOD( npb(ji) - 1, jpi ) + 1 ; ij = ( npb(ji) - 1 ) / jpi + 1 636 ! Remaining heat flux (W.m-2) is sent to the ocean heat budget 637 hfx_out(ii,ij) = hfx_out(ii,ij) + ( zq_1cat(ji) + zq_rema(ji) * a_i_1d(ji) ) * r1_rdtice 638 639 IF( ln_nicep .AND. zq_rema(ji) < 0. .AND. lwp ) WRITE(numout,*) 'ALERTE zq_rema <0 = ', zq_rema(ji) 640 END DO 641 664 642 ! 665 643 !------------------------------------------------------------------------------| … … 670 648 DO ji = kideb, kiut 671 649 ! 672 dh_snowice(ji) = MAX( zzero , ( rhosn * ht_s_b(ji) + (rhoic-rau0) * ht_i_b(ji) ) / ( rhosn+rau0-rhoic ) ) 673 zhgnew(ji) = MAX( zhgnew(ji) , zhgnew(ji) + dh_snowice(ji) ) 674 zhnnew = MIN( ht_s_b(ji) , ht_s_b(ji) - dh_snowice(ji) ) 675 676 ! Changes in ice volume and ice mass. 677 dvnbq_1d (ji) = a_i_b(ji) * ( zhgnew(ji)-ht_i_b(ji) ) 678 dmgwi_1d (ji) = dmgwi_1d(ji) + a_i_b(ji) * ( ht_s_b(ji) - zhnnew ) * rhosn 679 680 !clem rdm_ice_1d(ji) = rdm_ice_1d(ji) + a_i_b(ji) * ( zhgnew(ji) - ht_i_b(ji) ) * rhoic 681 !clem rdm_snw_1d(ji) = rdm_snw_1d(ji) + a_i_b(ji) * ( zhnnew - ht_s_b(ji) ) * rhosn 682 683 ! Equivalent salt flux (1) Snow-ice formation component 684 ! ----------------------------------------------------- 685 ii = MOD( npb(ji) - 1, jpi ) + 1 686 ij = ( npb(ji) - 1 ) / jpi + 1 687 688 IF( num_sal == 2 ) THEN ; zsm_snowice = sss_m(ii,ij) * ( rhoic - rhosn ) / rhoic 689 ELSE ; zsm_snowice = sm_i_b(ji) 690 ENDIF 650 dh_snowice(ji) = MAX( 0._wp , ( rhosn * ht_s_1d(ji) + (rhoic-rau0) * ht_i_1d(ji) ) / ( rhosn+rau0-rhoic ) ) 651 652 ht_i_1d(ji) = ht_i_1d(ji) + dh_snowice(ji) 653 ht_s_1d(ji) = ht_s_1d(ji) - dh_snowice(ji) 654 655 ! Salinity of snow ice 656 ii = MOD( npb(ji) - 1, jpi ) + 1 ; ij = ( npb(ji) - 1 ) / jpi + 1 657 zs_snic = zswitch_sal * sss_m(ii,ij) * ( rhoic - rhosn ) / rhoic + ( 1. - zswitch_sal ) * sm_i_1d(ji) 658 691 659 ! entrapment during snow ice formation 692 ! clem:new salinity difference stored (to be used in limthd_ent.F90)660 ! new salinity difference stored (to be used in limthd_ent.F90) 693 661 IF ( num_sal == 2 ) THEN 694 i_ice_switch = MAX( 0._wp , SIGN( 1._wp , zhgnew(ji) - epsi10 ) )662 rswitch = MAX( 0._wp , SIGN( 1._wp , ht_i_1d(ji) - epsi10 ) ) 695 663 ! salinity dif due to snow-ice formation 696 dsm_i_si_1d(ji) = ( zs m_snowice - sm_i_b(ji) ) * dh_snowice(ji) / MAX( zhgnew(ji), epsi10 ) * i_ice_switch664 dsm_i_si_1d(ji) = ( zs_snic - sm_i_1d(ji) ) * dh_snowice(ji) / MAX( ht_i_1d(ji), epsi10 ) * rswitch 697 665 ! salinity dif due to bottom growth 698 IF ( fc_bo_i(ji) + fbif_1d(ji) + qlbbq_1d(ji) < 0._wp ) THEN699 dsm_i_se_1d(ji) = ( s_i_new(ji) - sm_i_ b(ji) ) * dh_i_bott(ji) / MAX( zhgnew(ji), epsi10 ) * i_ice_switch666 IF ( zf_tt(ji) < 0._wp ) THEN 667 dsm_i_se_1d(ji) = ( s_i_new(ji) - sm_i_1d(ji) ) * dh_i_bott(ji) / MAX( ht_i_1d(ji), epsi10 ) * rswitch 700 668 ENDIF 701 669 ENDIF 702 670 703 ! Actualize new snow and ice thickness. 704 ht_s_b(ji) = zhnnew 705 ht_i_b(ji) = zhgnew(ji) 706 707 ! Total ablation ! new lines added to debug 708 IF( ht_i_b(ji) <= 0._wp ) a_i_b(ji) = 0._wp 709 710 ! diagnostic ( snow ice growth ) 711 ii = MOD( npb(ji) - 1, jpi ) + 1 712 ij = ( npb(ji) - 1 ) / jpi + 1 713 diag_sni_gr(ii,ij) = diag_sni_gr(ii,ij) + dh_snowice(ji)*a_i_b(ji) * r1_rdtice 714 ! 715 ! salt flux 716 sfx_thd_1d(ji) = sfx_thd_1d(ji) - zsm_snowice * a_i_b(ji) * dh_snowice(ji) * rhoic * r1_rdtice 717 !-------------------------------- 718 ! Update mass fluxes (clem) 719 !-------------------------------- 720 rdm_ice_1d(ji) = rdm_ice_1d(ji) + ( a_i_b(ji) * ht_i_b(ji) - zviold(ji) ) * rhoic 721 rdm_snw_1d(ji) = rdm_snw_1d(ji) + ( a_i_b(ji) * ht_s_b(ji) - zvsold(ji) ) * rhosn 671 ! Contribution to energy flux to the ocean [J/m2], >0 (if sst<0) 672 ii = MOD( npb(ji) - 1, jpi ) + 1 ; ij = ( npb(ji) - 1 ) / jpi + 1 673 zfmdt = ( rhosn - rhoic ) * MAX( dh_snowice(ji), 0._wp ) ! <0 674 zsstK = sst_m(ii,ij) + rt0 675 zEw = rcp * ( zsstK - rt0 ) 676 zQm = zfmdt * zEw 677 678 ! Contribution to heat flux 679 hfx_thd_1d(ji) = hfx_thd_1d(ji) + zfmdt * a_i_1d(ji) * zEw * r1_rdtice 680 681 ! Contribution to salt flux 682 sfx_sni_1d(ji) = sfx_sni_1d(ji) + sss_m(ii,ij) * a_i_1d(ji) * zfmdt * r1_rdtice 683 684 ! Contribution to mass flux 685 ! All snow is thrown in the ocean, and seawater is taken to replace the volume 686 wfx_sni_1d(ji) = wfx_sni_1d(ji) - a_i_1d(ji) * dh_snowice(ji) * rhoic * r1_rdtice 687 wfx_snw_1d(ji) = wfx_snw_1d(ji) + a_i_1d(ji) * dh_snowice(ji) * rhosn * r1_rdtice 688 689 ! update heat content (J.m-2) and layer thickness 690 qh_i_old(ji,0) = qh_i_old(ji,0) + dh_snowice(ji) * q_s_1d(ji,1) + zfmdt * zEw 691 h_i_old (ji,0) = h_i_old (ji,0) + dh_snowice(ji) 692 693 ! Total ablation (to debug) 694 IF( ht_i_1d(ji) <= 0._wp ) a_i_1d(ji) = 0._wp 722 695 723 696 END DO !ji 724 ! 725 CALL wrk_dealloc( jpij, zh_i, zh_s, ztfs, zhsold, zqprec, zqfont_su, zqfont_bo, z_f_surf, zhgnew, zfmass_i ) 726 CALL wrk_dealloc( jpij, zdh_s_mel, zdh_s_pre, zdh_s_sub, zfdt_init, zfdt_final, zqt_i, zqt_s, zqt_dummy ) 727 CALL wrk_dealloc( jpij, zinnermelt, zfbase, zdq_i ) 728 CALL wrk_dealloc( jpij, jkmax, zdeltah, zqt_i_lay ) 729 ! 730 CALL wrk_dealloc( jpij, zviold, zvsold ) ! clem 697 698 ! 699 !------------------------------------------- 700 ! Update temperature, energy 701 !------------------------------------------- 702 !clem bug: we should take snow into account here 703 DO ji = kideb, kiut 704 rswitch = 1.0 - MAX( 0._wp , SIGN( 1._wp , - ht_i_1d(ji) ) ) 705 t_su_1d(ji) = rswitch * t_su_1d(ji) + ( 1.0 - rswitch ) * rtt 706 END DO ! ji 707 708 DO jk = 1, nlay_s 709 DO ji = kideb,kiut 710 ! mask enthalpy 711 rswitch = MAX( 0._wp , SIGN( 1._wp, - ht_s_1d(ji) ) ) 712 q_s_1d(ji,jk) = ( 1.0 - rswitch ) * q_s_1d(ji,jk) 713 ! recalculate t_s_1d from q_s_1d 714 t_s_1d(ji,jk) = rtt + ( 1._wp - rswitch ) * ( - q_s_1d(ji,jk) / ( rhosn * cpic ) + lfus / cpic ) 715 END DO 716 END DO 717 718 CALL wrk_dealloc( jpij, zh_s, zqprec, zq_su, zq_bo, zf_tt, zq_1cat, zq_rema ) 719 CALL wrk_dealloc( jpij, zdh_s_mel, zdh_s_pre, zdh_s_sub, zqh_i, zqh_s, zq_s ) 720 CALL wrk_dealloc( jpij, nlay_i+1, zdeltah, zh_i ) 721 CALL wrk_dealloc( jpij, icount ) 722 ! 731 723 ! 732 724 END SUBROUTINE lim_thd_dh
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