[825] | 1 | MODULE limthd_dh |
---|
[1572] | 2 | !!====================================================================== |
---|
| 3 | !! *** MODULE limthd_dh *** |
---|
| 4 | !! LIM-3 : thermodynamic growth and decay of the ice |
---|
| 5 | !!====================================================================== |
---|
| 6 | !! History : LIM ! 2003-05 (M. Vancoppenolle) Original code in 1D |
---|
| 7 | !! ! 2005-06 (M. Vancoppenolle) 3D version |
---|
[4161] | 8 | !! 3.2 ! 2009-07 (M. Vancoppenolle, Y. Aksenov, G. Madec) bug correction in rdm_snw & rdm_ice |
---|
[3625] | 9 | !! 3.4 ! 2011-02 (G. Madec) dynamical allocation |
---|
| 10 | !! 3.5 ! 2012-10 (G. Madec & co) salt flux + bug fixes |
---|
[1572] | 11 | !!---------------------------------------------------------------------- |
---|
[825] | 12 | #if defined key_lim3 |
---|
[834] | 13 | !!---------------------------------------------------------------------- |
---|
| 14 | !! 'key_lim3' LIM3 sea-ice model |
---|
| 15 | !!---------------------------------------------------------------------- |
---|
[3625] | 16 | !! lim_thd_dh : vertical accr./abl. and lateral ablation of sea ice |
---|
[825] | 17 | !!---------------------------------------------------------------------- |
---|
[3625] | 18 | USE par_oce ! ocean parameters |
---|
| 19 | USE phycst ! physical constants (OCE directory) |
---|
| 20 | USE sbc_oce ! Surface boundary condition: ocean fields |
---|
| 21 | USE ice ! LIM variables |
---|
| 22 | USE par_ice ! LIM parameters |
---|
| 23 | USE thd_ice ! LIM thermodynamics |
---|
| 24 | USE in_out_manager ! I/O manager |
---|
| 25 | USE lib_mpp ! MPP library |
---|
| 26 | USE wrk_nemo ! work arrays |
---|
| 27 | USE lib_fortran ! Fortran utilities (allows no signed zero when 'key_nosignedzero' defined) |
---|
[921] | 28 | |
---|
[825] | 29 | IMPLICIT NONE |
---|
| 30 | PRIVATE |
---|
| 31 | |
---|
[1572] | 32 | PUBLIC lim_thd_dh ! called by lim_thd |
---|
[825] | 33 | |
---|
[4333] | 34 | REAL(wp) :: epsi20 = 1.e-20 ! constant values |
---|
| 35 | 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 ! |
---|
[825] | 39 | |
---|
| 40 | !!---------------------------------------------------------------------- |
---|
[4161] | 41 | !! NEMO/LIM3 4.0 , UCL - NEMO Consortium (2010) |
---|
[1156] | 42 | !! $Id$ |
---|
[2715] | 43 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
---|
[825] | 44 | !!---------------------------------------------------------------------- |
---|
| 45 | CONTAINS |
---|
| 46 | |
---|
[2715] | 47 | SUBROUTINE lim_thd_dh( kideb, kiut, jl ) |
---|
[921] | 48 | !!------------------------------------------------------------------ |
---|
| 49 | !! *** ROUTINE lim_thd_dh *** |
---|
| 50 | !! |
---|
[1572] | 51 | !! ** Purpose : determines variations of ice and snow thicknesses. |
---|
[921] | 52 | !! |
---|
[1572] | 53 | !! ** Method : Ice/Snow surface melting arises from imbalance in surface fluxes |
---|
| 54 | !! Bottom accretion/ablation arises from flux budget |
---|
| 55 | !! Snow thickness can increase by precipitation and decrease by sublimation |
---|
| 56 | !! If snow load excesses Archmiede limit, snow-ice is formed by |
---|
| 57 | !! the flooding of sea-water in the snow |
---|
[921] | 58 | !! |
---|
[1572] | 59 | !! 1) Compute available flux of heat for surface ablation |
---|
| 60 | !! 2) Compute snow and sea ice enthalpies |
---|
| 61 | !! 3) Surface ablation and sublimation |
---|
| 62 | !! 4) Bottom accretion/ablation |
---|
| 63 | !! 5) Case of Total ablation |
---|
| 64 | !! 6) Snow ice formation |
---|
[921] | 65 | !! |
---|
[1572] | 66 | !! References : Bitz and Lipscomb, 1999, J. Geophys. Res. |
---|
| 67 | !! Fichefet T. and M. Maqueda 1997, J. Geophys. Res., 102(C6), 12609-12646 |
---|
| 68 | !! Vancoppenolle, Fichefet and Bitz, 2005, Geophys. Res. Let. |
---|
| 69 | !! Vancoppenolle et al.,2009, Ocean Modelling |
---|
[921] | 70 | !!------------------------------------------------------------------ |
---|
[1572] | 71 | INTEGER , INTENT(in) :: kideb, kiut ! Start/End point on which the the computation is applied |
---|
| 72 | INTEGER , INTENT(in) :: jl ! Thickness cateogry number |
---|
| 73 | !! |
---|
| 74 | INTEGER :: ji , jk ! dummy loop indices |
---|
[4161] | 75 | INTEGER :: ii, ij ! 2D corresponding indices to ji |
---|
[1572] | 76 | INTEGER :: isnow ! switch for presence (1) or absence (0) of snow |
---|
| 77 | INTEGER :: isnowic ! snow ice formation not |
---|
| 78 | INTEGER :: i_ice_switch ! ice thickness above a certain treshold or not |
---|
| 79 | INTEGER :: iter |
---|
[825] | 80 | |
---|
[2715] | 81 | REAL(wp) :: zzfmass_i, zihgnew ! local scalar |
---|
| 82 | REAL(wp) :: zzfmass_s, zhsnew, ztmelts ! local scalar |
---|
[1572] | 83 | REAL(wp) :: zhn, zdhcf, zdhbf, zhni, zhnfi, zihg ! |
---|
[2715] | 84 | REAL(wp) :: zdhnm, zhnnew, zhisn, zihic, zzc ! |
---|
[1572] | 85 | REAL(wp) :: zfracs ! fractionation coefficient for bottom salt entrapment |
---|
| 86 | REAL(wp) :: zcoeff ! dummy argument for snowfall partitioning over ice and leads |
---|
| 87 | REAL(wp) :: zsm_snowice ! snow-ice salinity |
---|
| 88 | REAL(wp) :: zswi1 ! switch for computation of bottom salinity |
---|
| 89 | REAL(wp) :: zswi12 ! switch for computation of bottom salinity |
---|
| 90 | REAL(wp) :: zswi2 ! switch for computation of bottom salinity |
---|
| 91 | REAL(wp) :: zgrr ! bottom growth rate |
---|
| 92 | REAL(wp) :: ztform ! bottom formation temperature |
---|
[2715] | 93 | ! |
---|
[3294] | 94 | REAL(wp), POINTER, DIMENSION(:) :: zh_i ! ice layer thickness |
---|
| 95 | 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 ! |
---|
| 104 | |
---|
[3625] | 105 | REAL(wp), POINTER, DIMENSION(:) :: zdh_s_mel ! snow melt |
---|
| 106 | REAL(wp), POINTER, DIMENSION(:) :: zdh_s_pre ! snow precipitation |
---|
| 107 | REAL(wp), POINTER, DIMENSION(:) :: zdh_s_sub ! snow sublimation |
---|
[3294] | 108 | |
---|
| 109 | 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 |
---|
| 119 | |
---|
[4161] | 120 | ! mass and salt flux (clem) |
---|
| 121 | REAL(wp) :: zdvres, zdvsur, zdvbot |
---|
| 122 | REAL(wp), POINTER, DIMENSION(:) :: zviold, zvsold ! old ice volume... |
---|
| 123 | |
---|
[3294] | 124 | ! Heat conservation |
---|
| 125 | INTEGER :: num_iter_max, numce_dh |
---|
| 126 | REAL(wp) :: meance_dh |
---|
[4333] | 127 | REAL(wp) :: zinda |
---|
[3294] | 128 | REAL(wp), POINTER, DIMENSION(:) :: zinnermelt |
---|
| 129 | REAL(wp), POINTER, DIMENSION(:) :: zfbase, zdq_i |
---|
[1572] | 130 | !!------------------------------------------------------------------ |
---|
[825] | 131 | |
---|
[3294] | 132 | CALL wrk_alloc( jpij, zh_i, zh_s, ztfs, zhsold, zqprec, zqfont_su, zqfont_bo, z_f_surf, zhgnew, zfmass_i ) |
---|
[4161] | 133 | CALL wrk_alloc( jpij, zdh_s_mel, zdh_s_pre, zdh_s_sub, zfdt_init, zfdt_final, zqt_i, zqt_s, zqt_dummy ) |
---|
[3294] | 134 | CALL wrk_alloc( jpij, zinnermelt, zfbase, zdq_i ) |
---|
| 135 | CALL wrk_alloc( jpij, jkmax, zdeltah, zqt_i_lay ) |
---|
[825] | 136 | |
---|
[4161] | 137 | CALL wrk_alloc( jpij, zviold, zvsold ) ! clem |
---|
| 138 | |
---|
[3625] | 139 | ftotal_fin(:) = 0._wp |
---|
| 140 | zfdt_init (:) = 0._wp |
---|
| 141 | zfdt_final(:) = 0._wp |
---|
[2715] | 142 | |
---|
[4161] | 143 | dh_i_surf (:) = 0._wp |
---|
| 144 | dh_i_bott (:) = 0._wp |
---|
| 145 | dh_snowice(:) = 0._wp |
---|
| 146 | |
---|
[825] | 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) |
---|
[4161] | 150 | zviold(ji) = a_i_b(ji) * ht_i_b(ji) ! clem |
---|
| 151 | zvsold(ji) = a_i_b(ji) * ht_s_b(ji) ! clem |
---|
[825] | 152 | END DO |
---|
[921] | 153 | ! |
---|
| 154 | !------------------------------------------------------------------------------! |
---|
| 155 | ! 1) Calculate available heat for surface ablation ! |
---|
| 156 | !------------------------------------------------------------------------------! |
---|
| 157 | ! |
---|
[2715] | 158 | DO ji = kideb, kiut |
---|
[3625] | 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) ) ) |
---|
[1572] | 163 | zfdt_init(ji) = ( z_f_surf(ji) + MAX( fbif_1d(ji) + qlbbq_1d(ji) + fc_bo_i(ji),0.0 ) ) * rdt_ice |
---|
[825] | 164 | END DO ! ji |
---|
| 165 | |
---|
[2715] | 166 | zqfont_su (:) = 0._wp |
---|
| 167 | zqfont_bo (:) = 0._wp |
---|
| 168 | dsm_i_se_1d(:) = 0._wp |
---|
| 169 | dsm_i_si_1d(:) = 0._wp |
---|
[921] | 170 | ! |
---|
| 171 | !------------------------------------------------------------------------------! |
---|
| 172 | ! 2) Computing layer thicknesses and snow and sea-ice enthalpies. ! |
---|
| 173 | !------------------------------------------------------------------------------! |
---|
| 174 | ! |
---|
[2715] | 175 | DO ji = kideb, kiut ! Layer thickness |
---|
[4161] | 176 | zh_i(ji) = ht_i_b(ji) / REAL( nlay_i ) |
---|
| 177 | zh_s(ji) = ht_s_b(ji) / REAL( nlay_s ) |
---|
[825] | 178 | END DO |
---|
[2715] | 179 | ! |
---|
| 180 | zqt_s(:) = 0._wp ! Total enthalpy of the snow |
---|
[825] | 181 | DO jk = 1, nlay_s |
---|
[2715] | 182 | DO ji = kideb, kiut |
---|
[4161] | 183 | zqt_s(ji) = zqt_s(ji) + q_s_b(ji,jk) * ht_s_b(ji) / REAL( nlay_s ) |
---|
[825] | 184 | END DO |
---|
| 185 | END DO |
---|
[2715] | 186 | ! |
---|
| 187 | zqt_i(:) = 0._wp ! Total enthalpy of the ice |
---|
[825] | 188 | DO jk = 1, nlay_i |
---|
[2715] | 189 | DO ji = kideb, kiut |
---|
[4161] | 190 | zzc = q_i_b(ji,jk) * ht_i_b(ji) / REAL( nlay_i ) |
---|
[2715] | 191 | zqt_i(ji) = zqt_i(ji) + zzc |
---|
| 192 | zqt_i_lay(ji,jk) = zzc |
---|
[825] | 193 | END DO |
---|
| 194 | END DO |
---|
[921] | 195 | ! |
---|
| 196 | !------------------------------------------------------------------------------| |
---|
| 197 | ! 3) Surface ablation and sublimation | |
---|
| 198 | !------------------------------------------------------------------------------| |
---|
| 199 | ! |
---|
[834] | 200 | !------------------------- |
---|
| 201 | ! 3.1 Snow precips / melt |
---|
| 202 | !------------------------- |
---|
[825] | 203 | ! Snow accumulation in one thermodynamic time step |
---|
| 204 | ! snowfall is partitionned between leads and ice |
---|
| 205 | ! if snow fall was uniform, a fraction (1-at_i) would fall into leads |
---|
| 206 | ! but because of the winds, more snow falls on leads than on sea ice |
---|
| 207 | ! and a greater fraction (1-at_i)^beta of the total mass of snow |
---|
[834] | 208 | ! (beta < 1) falls in leads. |
---|
[825] | 209 | ! In reality, beta depends on wind speed, |
---|
| 210 | ! and should decrease with increasing wind speed but here, it is |
---|
[834] | 211 | ! considered as a constant. an average value is 0.66 |
---|
[825] | 212 | ! Martin Vancoppenolle, December 2006 |
---|
| 213 | |
---|
| 214 | ! Snow fall |
---|
| 215 | DO ji = kideb, kiut |
---|
| 216 | zcoeff = ( 1.0 - ( 1.0 - at_i_b(ji) )**betas ) / at_i_b(ji) |
---|
| 217 | zdh_s_pre(ji) = zcoeff * sprecip_1d(ji) * rdt_ice / rhosn |
---|
| 218 | END DO |
---|
[2715] | 219 | zdh_s_mel(:) = 0._wp |
---|
[825] | 220 | |
---|
| 221 | ! Melt of fallen snow |
---|
| 222 | DO ji = kideb, kiut |
---|
| 223 | ! tatm_ice is now in K |
---|
[1572] | 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) |
---|
[825] | 230 | ! heat conservation |
---|
[1572] | 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 ) |
---|
[825] | 234 | END DO |
---|
| 235 | |
---|
| 236 | |
---|
| 237 | ! Snow melt due to surface heat imbalance |
---|
| 238 | DO jk = 1, nlay_s |
---|
| 239 | DO ji = kideb, kiut |
---|
[1572] | 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 |
---|
[825] | 244 | END DO |
---|
| 245 | END DO |
---|
| 246 | |
---|
| 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 |
---|
[3625] | 254 | zhn = 1.0 - MAX( zzero , SIGN( zone , - zhsnew ) ) |
---|
[825] | 255 | ht_s_b(ji) = MAX( zzero , zhsnew ) |
---|
[4161] | 256 | ! we recompute dh_s_tot (clem) |
---|
| 257 | dh_s_tot (ji) = ht_s_b(ji) - zhsold(ji) |
---|
[825] | 258 | ! Volume and mass variations of snow |
---|
[3625] | 259 | dvsbq_1d (ji) = a_i_b(ji) * ( ht_s_b(ji) - zhsold(ji) - zdh_s_pre(ji) ) |
---|
[1572] | 260 | dvsbq_1d (ji) = MIN( zzero, dvsbq_1d(ji) ) |
---|
[4161] | 261 | !clem rdm_snw_1d(ji) = rdm_snw_1d(ji) + rhosn * dvsbq_1d(ji) |
---|
[825] | 262 | END DO ! ji |
---|
| 263 | |
---|
[834] | 264 | !-------------------------- |
---|
| 265 | ! 3.2 Surface ice ablation |
---|
| 266 | !-------------------------- |
---|
[825] | 267 | DO ji = kideb, kiut |
---|
[3625] | 268 | z_f_surf (ji) = zqfont_su(ji) * r1_rdtice ! heat conservation test |
---|
[2715] | 269 | zdq_i (ji) = 0._wp |
---|
[825] | 270 | END DO ! ji |
---|
| 271 | |
---|
| 272 | DO jk = 1, nlay_i |
---|
| 273 | DO ji = kideb, kiut |
---|
[1572] | 274 | ! ! melt of layer jk |
---|
| 275 | zdeltah (ji,jk) = - zqfont_su(ji) / q_i_b(ji,jk) |
---|
| 276 | ! ! recompute heat available |
---|
[3625] | 277 | zqfont_su(ji ) = MAX( 0.0 , - zh_i(ji) - zdeltah(ji,jk) ) * q_i_b(ji,jk) |
---|
[1572] | 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 |
---|
[3625] | 281 | dh_i_surf(ji ) = dh_i_surf(ji) + zdeltah(ji,jk) |
---|
[1572] | 282 | ! ! for energy conservation |
---|
[3625] | 283 | zdq_i (ji ) = zdq_i(ji) + zdeltah(ji,jk) * q_i_b(ji,jk) * r1_rdtice |
---|
[1572] | 284 | ! |
---|
[4161] | 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 |
---|
[1572] | 288 | END DO |
---|
| 289 | END DO |
---|
[825] | 290 | |
---|
[4333] | 291 | ! !------------------- |
---|
| 292 | IF( con_i .AND. jiindex_1d > 0 ) THEN ! Conservation test |
---|
| 293 | ! !------------------- |
---|
[1572] | 294 | numce_dh = 0 |
---|
[2715] | 295 | meance_dh = 0._wp |
---|
[921] | 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 |
---|
[1572] | 301 | IF( z_f_surf(ji) + zdq_i(ji) .GE. 1.0e-3 ) THEN! |
---|
[921] | 302 | WRITE(numout,*) ' ALERTE heat loss for surface melt ' |
---|
[3625] | 303 | WRITE(numout,*) ' ii, ij, jl :', ii, ij, jl |
---|
[2715] | 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) |
---|
[3625] | 312 | WRITE(numout,*) ' sss_m : ', sss_m(ii,ij) |
---|
[921] | 313 | ENDIF |
---|
[1572] | 314 | END DO |
---|
| 315 | ! |
---|
| 316 | IF( numce_dh > 0 ) meance_dh = meance_dh / numce_dh |
---|
[921] | 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 |
---|
[1572] | 321 | ! |
---|
| 322 | ENDIF |
---|
[825] | 323 | |
---|
[834] | 324 | !---------------------- |
---|
| 325 | ! 3.3 Snow sublimation |
---|
| 326 | !---------------------- |
---|
[825] | 327 | |
---|
| 328 | DO ji = kideb, kiut |
---|
[3808] | 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 |
---|
[1572] | 334 | zdh_s_sub(ji) = - parsub * qla_ice_1d(ji) / ( rhosn * lsub ) * rdt_ice |
---|
[3808] | 335 | #endif |
---|
[1572] | 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 ) |
---|
[825] | 339 | ! we recompute dh_s_tot |
---|
[1572] | 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 |
---|
[825] | 343 | |
---|
[1572] | 344 | zqt_dummy(:) = 0.e0 |
---|
[825] | 345 | DO jk = 1, nlay_s |
---|
| 346 | DO ji = kideb,kiut |
---|
[1572] | 347 | q_s_b (ji,jk) = rhosn * ( cpic * ( rtt - t_s_b(ji,jk) ) + lfus ) |
---|
[4161] | 348 | zqt_dummy(ji) = zqt_dummy(ji) + q_s_b(ji,jk) * ht_s_b(ji) / REAL( nlay_s ) ! heat conservation |
---|
[825] | 349 | END DO |
---|
| 350 | END DO |
---|
| 351 | |
---|
[1572] | 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 |
---|
[3625] | 355 | zhisn = MAX( zzero , SIGN( zone, - ht_s_b(ji) ) ) |
---|
[825] | 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 |
---|
[921] | 359 | END DO |
---|
[825] | 360 | |
---|
[921] | 361 | ! |
---|
| 362 | !------------------------------------------------------------------------------! |
---|
| 363 | ! 4) Basal growth / melt ! |
---|
| 364 | !------------------------------------------------------------------------------! |
---|
| 365 | ! |
---|
[825] | 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). |
---|
[834] | 370 | ! fc_bo_i is positive downwards. fbif and qlbbq are positive to the ice |
---|
[825] | 371 | |
---|
[834] | 372 | !----------------------------------------------------- |
---|
| 373 | ! 4.1 Basal growth - (a) salinity not varying in time |
---|
| 374 | !----------------------------------------------------- |
---|
[3625] | 375 | IF( num_sal /= 2 ) THEN ! ice salinity constant in time |
---|
[825] | 376 | DO ji = kideb, kiut |
---|
[3625] | 377 | IF( ( fc_bo_i(ji) + fbif_1d(ji) + qlbbq_1d(ji) ) < 0._wp ) THEN |
---|
[825] | 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 |
---|
[921] | 383 | ! Baltic |
---|
[1572] | 384 | q_i_b(ji,nlay_i+1) = rhoic * ( cpic * ( ztmelts - ztform ) & |
---|
| 385 | & + lfus * ( 1.0 - ( ztmelts - rtt ) / ( ztform - rtt ) ) & |
---|
| 386 | & - rcp * ( ztmelts - rtt ) ) |
---|
[825] | 387 | ! Basal growth rate = - F*dt / q |
---|
[3625] | 388 | dh_i_bott(ji) = - rdt_ice * ( fc_bo_i(ji) + fbif_1d(ji) + qlbbq_1d(ji) ) / q_i_b(ji,nlay_i+1) |
---|
[4161] | 389 | sfx_thd_1d(ji) = sfx_thd_1d(ji) - s_i_new(ji) * a_i_b(ji) * dh_i_bott(ji) * rhoic * r1_rdtice |
---|
[1572] | 390 | ENDIF |
---|
| 391 | END DO |
---|
| 392 | ENDIF |
---|
[825] | 393 | |
---|
[834] | 394 | !------------------------------------------------- |
---|
| 395 | ! 4.1 Basal growth - (b) salinity varying in time |
---|
| 396 | !------------------------------------------------- |
---|
[3625] | 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 |
---|
[834] | 401 | ! See Vancoppenolle et al., OM08 for more info on this |
---|
[825] | 402 | |
---|
| 403 | ! Initial value (tested 1D, can be anything between 1 and 20) |
---|
| 404 | num_iter_max = 4 |
---|
[1572] | 405 | s_i_new(:) = 4.0 |
---|
[825] | 406 | |
---|
| 407 | ! Iterative procedure |
---|
| 408 | DO iter = 1, num_iter_max |
---|
| 409 | DO ji = kideb, kiut |
---|
[1572] | 410 | IF( fc_bo_i(ji) + fbif_1d(ji) + qlbbq_1d(ji) < 0.e0 ) THEN |
---|
[3625] | 411 | ii = MOD( npb(ji) - 1, jpi ) + 1 |
---|
| 412 | ij = ( npb(ji) - 1 ) / jpi + 1 |
---|
[825] | 413 | ! Melting point in K |
---|
| 414 | ztmelts = - tmut * s_i_new(ji) + rtt |
---|
| 415 | ! New ice heat content (Bitz and Lipscomb, 1999) |
---|
[1572] | 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 ) ) |
---|
[825] | 419 | ! Bottom growth rate = - F*dt / q |
---|
[1572] | 420 | dh_i_bott(ji) = - rdt_ice * ( fc_bo_i(ji) + fbif_1d(ji) + qlbbq_1d(ji) ) / q_i_b(ji,nlay_i+1) |
---|
[825] | 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 |
---|
[3625] | 425 | zgrr = MIN( 1.0e-3, MAX ( dh_i_bott(ji) * r1_rdtice , epsi13 ) ) |
---|
[825] | 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 |
---|
[1572] | 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 ) ) |
---|
[4161] | 431 | zfracs = MIN( 0.5 , zfracs ) |
---|
[3625] | 432 | s_i_new(ji) = zfracs * sss_m(ii,ij) |
---|
[825] | 433 | ENDIF ! fc_bo_i |
---|
| 434 | END DO ! ji |
---|
| 435 | END DO ! iter |
---|
| 436 | |
---|
| 437 | ! Final values |
---|
| 438 | DO ji = kideb, kiut |
---|
[1572] | 439 | IF( ( fc_bo_i(ji) + fbif_1d(ji) + qlbbq_1d(ji) ) .LT. 0.0 ) THEN |
---|
[4161] | 440 | ! New ice salinity must not exceed 20 psu |
---|
[825] | 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) |
---|
[1572] | 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 ) ) |
---|
[825] | 448 | ! Basal growth rate = - F*dt / q |
---|
[3625] | 449 | dh_i_bott(ji) = - rdt_ice * ( fc_bo_i(ji) + fbif_1d(ji) + qlbbq_1d(ji) ) / q_i_b(ji,nlay_i+1) |
---|
[834] | 450 | ! Salinity update |
---|
[825] | 451 | ! entrapment during bottom growth |
---|
[4161] | 452 | sfx_thd_1d(ji) = sfx_thd_1d(ji) - s_i_new(ji) * a_i_b(ji) * dh_i_bott(ji) * rhoic * r1_rdtice |
---|
[825] | 453 | ENDIF ! heat budget |
---|
[1572] | 454 | END DO |
---|
| 455 | ENDIF |
---|
[825] | 456 | |
---|
[834] | 457 | !---------------- |
---|
| 458 | ! 4.2 Basal melt |
---|
| 459 | !---------------- |
---|
[2715] | 460 | meance_dh = 0._wp |
---|
[1572] | 461 | numce_dh = 0 |
---|
[2715] | 462 | zinnermelt(:) = 0._wp |
---|
[825] | 463 | |
---|
| 464 | DO ji = kideb, kiut |
---|
| 465 | ! heat convergence at the surface > 0 |
---|
[2715] | 466 | IF( ( fc_bo_i(ji) + fbif_1d(ji) + qlbbq_1d(ji) ) >= 0._wp ) THEN |
---|
[825] | 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) ) |
---|
[3625] | 469 | zfbase(ji) = zqfont_bo(ji) * r1_rdtice ! heat conservation test |
---|
[2715] | 470 | zdq_i(ji) = 0._wp |
---|
| 471 | dh_i_bott(ji) = 0._wp |
---|
[825] | 472 | ENDIF |
---|
| 473 | END DO |
---|
| 474 | |
---|
| 475 | DO jk = nlay_i, 1, -1 |
---|
| 476 | DO ji = kideb, kiut |
---|
[3625] | 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 |
---|
[825] | 489 | ENDIF |
---|
[4161] | 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 |
---|
[825] | 493 | ENDIF |
---|
| 494 | END DO ! ji |
---|
| 495 | END DO ! jk |
---|
| 496 | |
---|
[4333] | 497 | ! !------------------- |
---|
| 498 | IF( con_i .AND. jiindex_1d > 0 ) THEN ! Conservation test |
---|
| 499 | ! !------------------- |
---|
[921] | 500 | DO ji = kideb, kiut |
---|
[1572] | 501 | IF( ( fc_bo_i(ji) + fbif_1d(ji) + qlbbq_1d(ji) ) >= 0.e0 ) THEN |
---|
| 502 | IF( ( zfbase(ji) + zdq_i(ji) ) >= 1.e-3 ) THEN |
---|
| 503 | numce_dh = numce_dh + 1 |
---|
[921] | 504 | meance_dh = meance_dh + zfbase(ji) + zdq_i(ji) |
---|
| 505 | ENDIF |
---|
| 506 | IF ( zfbase(ji) + zdq_i(ji) .GE. 1.0e-3 ) THEN |
---|
[3625] | 507 | WRITE(numout,*) ' ALERTE heat loss for basal melt : ii, ij, jl :', ii, ij, jl |
---|
[2715] | 508 | 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) |
---|
[3625] | 516 | WRITE(numout,*) ' sss_m : ', sss_m(ii,ij) |
---|
[921] | 517 | WRITE(numout,*) ' dh_i_bott : ', dh_i_bott(ji) |
---|
[2715] | 518 | WRITE(numout,*) ' innermelt : ', INT( zinnermelt(ji) ) |
---|
[921] | 519 | ENDIF |
---|
[1572] | 520 | ENDIF |
---|
| 521 | END DO |
---|
| 522 | IF( numce_dh > 0 ) meance_dh = meance_dh / numce_dh |
---|
[921] | 523 | WRITE(numout,*) ' Number of points where there is bas. me. error : ', numce_dh |
---|
| 524 | WRITE(numout,*) ' Mean basal melt error on error points : ', meance_dh |
---|
| 525 | WRITE(numout,*) ' Remaining bottom heat : ', zqfont_bo(jiindex_1d) |
---|
[1572] | 526 | ! |
---|
| 527 | ENDIF |
---|
[825] | 528 | |
---|
[921] | 529 | ! |
---|
| 530 | !------------------------------------------------------------------------------! |
---|
| 531 | ! 5) Pathological cases ! |
---|
| 532 | !------------------------------------------------------------------------------! |
---|
| 533 | ! |
---|
[834] | 534 | !---------------------------------------------- |
---|
| 535 | ! 5.1 Excessive ablation in a 1-category model |
---|
| 536 | !---------------------------------------------- |
---|
[825] | 537 | |
---|
| 538 | DO ji = kideb, kiut |
---|
[1572] | 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 |
---|
[4161] | 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 |
---|
[1572] | 546 | ! ! excessive energy is sent to lateral ablation |
---|
[4333] | 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 |
---|
[825] | 549 | END DO |
---|
| 550 | |
---|
[834] | 551 | !----------------------------------- |
---|
| 552 | ! 5.2 More than available ice melts |
---|
| 553 | !----------------------------------- |
---|
[3625] | 554 | ! then heat applied minus heat content at previous time step should equal heat remaining |
---|
[825] | 555 | ! |
---|
| 556 | DO ji = kideb, kiut |
---|
| 557 | ! Adapt the remaining energy if too much ice melts |
---|
| 558 | !-------------------------------------------------- |
---|
[4161] | 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 |
---|
[834] | 574 | zfdt_final(ji) = ( 1.0 - zihgnew ) * ( zqfont_su(ji) + zqfont_bo(ji) ) |
---|
[825] | 575 | |
---|
| 576 | ! If snow remains, energy is used to melt snow |
---|
[1572] | 577 | zhni = ht_s_b(ji) ! snow depth at previous time step |
---|
[3625] | 578 | zihg = MAX( zzero , SIGN ( zone , - ht_s_b(ji) ) ) ! =0 if snow |
---|
[825] | 579 | |
---|
| 580 | ! energy of melting of remaining snow |
---|
[4333] | 581 | zinda = MAX( 0._wp, SIGN( 1._wp , zhni - epsi10 ) ) |
---|
| 582 | zqt_s(ji) = ( 1. - zihg ) * zqt_s(ji) / MAX( zhni, epsi10 ) * zinda |
---|
[1572] | 583 | zdhnm = - ( 1. - zihg ) * ( 1. - zihgnew ) * zfdt_final(ji) / MAX( zqt_s(ji) , epsi13 ) |
---|
[3625] | 584 | zhnfi = zhni + zdhnm |
---|
[1572] | 585 | zfdt_final(ji) = MAX( zfdt_final(ji) + zqt_s(ji) * zdhnm , 0.0 ) |
---|
[825] | 586 | ht_s_b(ji) = MAX( zzero , zhnfi ) |
---|
| 587 | zqt_s(ji) = zqt_s(ji) * ht_s_b(ji) |
---|
[4161] | 588 | ! we recompute dh_s_tot (clem) |
---|
| 589 | dh_s_tot (ji) = ht_s_b(ji) - zhsold(ji) |
---|
[825] | 590 | |
---|
| 591 | ! Mass variations of ice and snow |
---|
| 592 | !--------------------------------- |
---|
[1572] | 593 | ! ! mass variation of the jl category |
---|
[1571] | 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 |
---|
[4161] | 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 |
---|
[825] | 602 | |
---|
| 603 | ! Remaining heat to the ocean |
---|
| 604 | !--------------------------------- |
---|
[3625] | 605 | focea(ji) = - zfdt_final(ji) * r1_rdtice ! focea is in W.m-2 * dt |
---|
[825] | 606 | |
---|
[4161] | 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 | ! |
---|
[4333] | 618 | ! diagnostic |
---|
[4161] | 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 |
---|
[825] | 624 | END DO |
---|
| 625 | |
---|
[3625] | 626 | ftotal_fin (:) = zfdt_final(:) * r1_rdtice |
---|
[825] | 627 | |
---|
| 628 | !--------------------------- |
---|
[4161] | 629 | ! heat fluxes |
---|
[825] | 630 | !--------------------------- |
---|
| 631 | DO ji = kideb, kiut |
---|
[3625] | 632 | zihgnew = 1.0 - MAX( zzero , SIGN( zone , - zhgnew(ji) ) ) ! =1 if ice |
---|
| 633 | ! |
---|
[825] | 634 | ! Heat flux |
---|
| 635 | ! excessive bottom ablation energy (fsup) - 0 except if jpl = 1 |
---|
[3625] | 636 | ! excessive total ablation energy (focea) sent to the ocean |
---|
[1572] | 637 | qfvbq_1d(ji) = qfvbq_1d(ji) + fsup(ji) + ( 1.0 - zihgnew ) * focea(ji) * a_i_b(ji) * rdt_ice |
---|
[825] | 638 | |
---|
[3625] | 639 | zihic = 1.0 - MAX( zzero , SIGN( zone , -ht_i_b(ji) ) ) ! equals 0 if ht_i = 0, 1 if ht_i gt 0 |
---|
[825] | 640 | fscbq_1d(ji) = a_i_b(ji) * fstbif_1d(ji) |
---|
[3625] | 641 | qldif_1d(ji) = qldif_1d(ji) + fsup(ji) + ( 1.0 - zihgnew ) * focea (ji) * a_i_b(ji) * rdt_ice & |
---|
[1572] | 642 | & + ( 1.0 - zihic ) * fscbq_1d(ji) * rdt_ice |
---|
[825] | 643 | END DO ! ji |
---|
| 644 | |
---|
| 645 | !------------------------------------------- |
---|
| 646 | ! Correct temperature, energy and thickness |
---|
| 647 | !------------------------------------------- |
---|
| 648 | DO ji = kideb, kiut |
---|
[1572] | 649 | zihgnew = 1.0 - MAX( zzero , SIGN( zone , - zhgnew(ji) ) ) |
---|
| 650 | t_su_b(ji) = zihgnew * t_su_b(ji) + ( 1.0 - zihgnew ) * rtt |
---|
[825] | 651 | END DO ! ji |
---|
| 652 | |
---|
| 653 | DO jk = 1, nlay_i |
---|
| 654 | DO ji = kideb, kiut |
---|
[1572] | 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) |
---|
[825] | 658 | END DO |
---|
| 659 | END DO ! ji |
---|
| 660 | |
---|
| 661 | DO ji = kideb, kiut |
---|
| 662 | ht_i_b(ji) = zhgnew(ji) |
---|
| 663 | END DO ! ji |
---|
[921] | 664 | ! |
---|
| 665 | !------------------------------------------------------------------------------| |
---|
| 666 | ! 6) Snow-Ice formation | |
---|
| 667 | !------------------------------------------------------------------------------| |
---|
[1572] | 668 | ! When snow load excesses Archimede's limit, snow-ice interface goes down under sea-level, |
---|
| 669 | ! flooding of seawater transforms snow into ice dh_snowice is positive for the ice |
---|
[825] | 670 | DO ji = kideb, kiut |
---|
[1572] | 671 | ! |
---|
| 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) ) |
---|
[825] | 675 | |
---|
[921] | 676 | ! Changes in ice volume and ice mass. |
---|
[1572] | 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 |
---|
[825] | 679 | |
---|
[4161] | 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 |
---|
[825] | 682 | |
---|
[921] | 683 | ! Equivalent salt flux (1) Snow-ice formation component |
---|
| 684 | ! ----------------------------------------------------- |
---|
[3625] | 685 | ii = MOD( npb(ji) - 1, jpi ) + 1 |
---|
| 686 | ij = ( npb(ji) - 1 ) / jpi + 1 |
---|
[825] | 687 | |
---|
[3625] | 688 | IF( num_sal == 2 ) THEN ; zsm_snowice = sss_m(ii,ij) * ( rhoic - rhosn ) / rhoic |
---|
| 689 | ELSE ; zsm_snowice = sm_i_b(ji) |
---|
[1572] | 690 | ENDIF |
---|
[825] | 691 | ! entrapment during snow ice formation |
---|
[4161] | 692 | ! clem: new salinity difference stored (to be used in limthd_ent.F90) |
---|
| 693 | IF ( num_sal == 2 ) THEN |
---|
[4333] | 694 | i_ice_switch = MAX( 0._wp , SIGN( 1._wp , zhgnew(ji) - epsi10 ) ) |
---|
[4161] | 695 | ! salinity dif due to snow-ice formation |
---|
[4333] | 696 | dsm_i_si_1d(ji) = ( zsm_snowice - sm_i_b(ji) ) * dh_snowice(ji) / MAX( zhgnew(ji), epsi10 ) * i_ice_switch |
---|
[4161] | 697 | ! salinity dif due to bottom growth |
---|
| 698 | IF ( fc_bo_i(ji) + fbif_1d(ji) + qlbbq_1d(ji) < 0._wp ) THEN |
---|
[4333] | 699 | dsm_i_se_1d(ji) = ( s_i_new(ji) - sm_i_b(ji) ) * dh_i_bott(ji) / MAX( zhgnew(ji), epsi10 ) * i_ice_switch |
---|
[4161] | 700 | ENDIF |
---|
| 701 | ENDIF |
---|
[825] | 702 | |
---|
[921] | 703 | ! Actualize new snow and ice thickness. |
---|
[825] | 704 | ht_s_b(ji) = zhnnew |
---|
| 705 | ht_i_b(ji) = zhgnew(ji) |
---|
| 706 | |
---|
| 707 | ! Total ablation ! new lines added to debug |
---|
[2715] | 708 | IF( ht_i_b(ji) <= 0._wp ) a_i_b(ji) = 0._wp |
---|
[825] | 709 | |
---|
| 710 | ! diagnostic ( snow ice growth ) |
---|
[3625] | 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 |
---|
[1572] | 714 | ! |
---|
[4161] | 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 |
---|
| 722 | |
---|
[825] | 723 | END DO !ji |
---|
[2715] | 724 | ! |
---|
[3294] | 725 | CALL wrk_dealloc( jpij, zh_i, zh_s, ztfs, zhsold, zqprec, zqfont_su, zqfont_bo, z_f_surf, zhgnew, zfmass_i ) |
---|
[4161] | 726 | CALL wrk_dealloc( jpij, zdh_s_mel, zdh_s_pre, zdh_s_sub, zfdt_init, zfdt_final, zqt_i, zqt_s, zqt_dummy ) |
---|
[3294] | 727 | CALL wrk_dealloc( jpij, zinnermelt, zfbase, zdq_i ) |
---|
| 728 | CALL wrk_dealloc( jpij, jkmax, zdeltah, zqt_i_lay ) |
---|
[2715] | 729 | ! |
---|
[4161] | 730 | CALL wrk_dealloc( jpij, zviold, zvsold ) ! clem |
---|
| 731 | ! |
---|
[921] | 732 | END SUBROUTINE lim_thd_dh |
---|
[1572] | 733 | |
---|
[825] | 734 | #else |
---|
[1572] | 735 | !!---------------------------------------------------------------------- |
---|
| 736 | !! Default option NO LIM3 sea-ice model |
---|
| 737 | !!---------------------------------------------------------------------- |
---|
[825] | 738 | CONTAINS |
---|
| 739 | SUBROUTINE lim_thd_dh ! Empty routine |
---|
| 740 | END SUBROUTINE lim_thd_dh |
---|
| 741 | #endif |
---|
[1572] | 742 | |
---|
| 743 | !!====================================================================== |
---|
[921] | 744 | END MODULE limthd_dh |
---|