| 1 | SUBROUTINE ice_th_dh(nlay_s,nlay_i,kideb,kiut) |
|---|
| 2 | !!------------------------------------------------------------------ |
|---|
| 3 | !! *** ROUTINE ice_th_dh *** |
|---|
| 4 | !! ** Purpose : |
|---|
| 5 | !! This routine determines variations of ice and snow thicknesses. |
|---|
| 6 | !! ** Method : |
|---|
| 7 | !! Ice/Snow surface melting arises from imbalance in surface fluxes |
|---|
| 8 | !! Bottom accretion/ablation arises from flux budget |
|---|
| 9 | !! Snow thickness can increase by precipitation and decrease by |
|---|
| 10 | !! sublimation |
|---|
| 11 | !! If snow load excesses Archmiede limit, snow-ice is formed by |
|---|
| 12 | !! the flooding of sea-water in the snow |
|---|
| 13 | !! ** Steps |
|---|
| 14 | !! 1) Compute available flux of heat for surface ablation |
|---|
| 15 | !! 2) Compute snow and sea ice enthalpies |
|---|
| 16 | !! 3) Surface ablation and sublimation |
|---|
| 17 | !! 4) Bottom accretion/ablation |
|---|
| 18 | !! 5) Case of Total ablation |
|---|
| 19 | !! 6) Snow ice formation |
|---|
| 20 | !! |
|---|
| 21 | !! ** Inputs / Outputs |
|---|
| 22 | !! |
|---|
| 23 | !! ** External |
|---|
| 24 | !! |
|---|
| 25 | !! ** References : Bitz and Lipscomb, JGR 99 |
|---|
| 26 | !! Fichefet T. and M. Maqueda 1997, |
|---|
| 27 | !! J. Geophys. Res., 102(C6), 12609-12646 |
|---|
| 28 | !! Vancoppenolle, Fichefet and Bitz, GRL 2005 |
|---|
| 29 | !! Vancoppenolle et al., OM08 |
|---|
| 30 | !! |
|---|
| 31 | !! ** History : |
|---|
| 32 | !! original code 01-04 (LIM) |
|---|
| 33 | !! original routine |
|---|
| 34 | !! (05-2003) M. Vancoppenolle, Louvain-La-Neuve, Belgium |
|---|
| 35 | !! (05-2008) BIO-LIM |
|---|
| 36 | !! |
|---|
| 37 | !!------------------------------------------------------------------ |
|---|
| 38 | !! * Arguments |
|---|
| 39 | !!------------------------------------------------------------------ |
|---|
| 40 | |
|---|
| 41 | USE lib_fortran |
|---|
| 42 | |
|---|
| 43 | INCLUDE 'type.com' |
|---|
| 44 | INCLUDE 'para.com' |
|---|
| 45 | INCLUDE 'const.com' |
|---|
| 46 | INCLUDE 'ice.com' |
|---|
| 47 | INCLUDE 'thermo.com' |
|---|
| 48 | |
|---|
| 49 | ! Local Variables |
|---|
| 50 | DIMENSION zrchu1(nbpt), zrchu2(nbpt), zqsat(nbpt), z_f_surf(nbpt) |
|---|
| 51 | DIMENSION zdeltah(maxnlay) |
|---|
| 52 | LOGICAL l_write |
|---|
| 53 | |
|---|
| 54 | zqt_s_ini = 0.0 |
|---|
| 55 | zqt_s_fin = 0.0 |
|---|
| 56 | zdqt_s = 0.0 |
|---|
| 57 | zqt_i_ini = 0.0 |
|---|
| 58 | zqt_i_fin = 0.0 |
|---|
| 59 | zdqt_i = 0.0 |
|---|
| 60 | s_i_max = 15.0 |
|---|
| 61 | |
|---|
| 62 | ! Local Constants |
|---|
| 63 | zeps = 1.0e-20 |
|---|
| 64 | l_write = .TRUE. |
|---|
| 65 | |
|---|
| 66 | IF ( l_write ) THEN |
|---|
| 67 | WRITE(numout,*) ' ** ice_th_dh : ' |
|---|
| 68 | WRITE(numout,*) ' ~~~~~~~~~~~~~~ ' |
|---|
| 69 | WRITE(numout,*) |
|---|
| 70 | ENDIF |
|---|
| 71 | ! |
|---|
| 72 | !------------------------------------------------------------------------------| |
|---|
| 73 | ! 1) Calculate available heat for surface ablation |
|---|
| 74 | !------------------------------------------------------------------------------| |
|---|
| 75 | ! |
|---|
| 76 | DO 20 ji = kideb, kiut |
|---|
| 77 | |
|---|
| 78 | z_f_surf(ji) = fratsb(ji) + fleb(ji) + fcsb(ji) - fc_su(ji) |
|---|
| 79 | & + ab(ji)*fsolgb(ji) |
|---|
| 80 | z_f_surf(ji) = MAX(c_zero,z_f_surf(ji)) |
|---|
| 81 | z_f_surf(ji) = z_f_surf(ji)*MAX(c_zero, |
|---|
| 82 | & SIGN(one,t_su_b(ji)-tfs(ji))) |
|---|
| 83 | |
|---|
| 84 | IF ( l_write ) THEN |
|---|
| 85 | WRITE(numout,*) ' Available heat for surface ablation ... ' |
|---|
| 86 | WRITE(numout,*) |
|---|
| 87 | WRITE(numout,*) ' z_f_surf : ', z_f_surf(ji) |
|---|
| 88 | WRITE(numout,*) ' fratsb : ', fratsb(ji) |
|---|
| 89 | WRITE(numout,*) ' fleb : ', fleb(ji) |
|---|
| 90 | WRITE(numout,*) ' fcsb : ', fcsb(ji) |
|---|
| 91 | WRITE(numout,*) ' fc_su : ', fc_su(ji) |
|---|
| 92 | WRITE(numout,*) ' ab : ', ab(ji) |
|---|
| 93 | WRITE(numout,*) ' fsolgb : ', fsolgb(ji) |
|---|
| 94 | WRITE(numout,*) |
|---|
| 95 | WRITE(numout,*) ' ht_i_b : ', ht_i_b(ji) |
|---|
| 96 | WRITE(numout,*) ' ht_s_b : ', ht_s_b(ji) |
|---|
| 97 | WRITE(numout,*) ' t_su_b : ', t_su_b(ji) |
|---|
| 98 | WRITE(numout,*) |
|---|
| 99 | ENDIF |
|---|
| 100 | |
|---|
| 101 | 20 CONTINUE |
|---|
| 102 | |
|---|
| 103 | ! |
|---|
| 104 | !------------------------------------------------------------------------------| |
|---|
| 105 | ! 2) Snowfall and surface melt | |
|---|
| 106 | !------------------------------------------------------------------------------| |
|---|
| 107 | ! |
|---|
| 108 | DO 40 ji = kideb, kiut |
|---|
| 109 | |
|---|
| 110 | ! total snow heat content for conservation |
|---|
| 111 | zqt_s_ini = q_s_b(ji,1) * ht_s_b(ji) |
|---|
| 112 | |
|---|
| 113 | IF ( l_write ) THEN |
|---|
| 114 | WRITE(numout,*) ' Surface ablation and sublimation ... ' |
|---|
| 115 | WRITE(numout,*) |
|---|
| 116 | WRITE(numout,*) ' zqt_s_ini : ', zqt_s_ini / ddtb |
|---|
| 117 | WRITE(numout,*) ' ht_s_b : ', ht_s_b(ji) |
|---|
| 118 | WRITE(numout,*) ' q_s_b(1) : ', q_s_b(ji,1) |
|---|
| 119 | WRITE(numout,*) |
|---|
| 120 | ENDIF |
|---|
| 121 | |
|---|
| 122 | !---------- |
|---|
| 123 | ! Snowfall |
|---|
| 124 | !---------- |
|---|
| 125 | dh_s_prec(ji) = hnpbqb(ji) |
|---|
| 126 | dh_s_melt(ji) = 0.0 |
|---|
| 127 | zqprec = rhon * ( cpg * ( tpw - tabqb(ji) ) + lfus ) |
|---|
| 128 | |
|---|
| 129 | ! Conservation update |
|---|
| 130 | zqt_s_ini = zqt_s_ini + zqprec*hnpbqb(ji) |
|---|
| 131 | fprec = - zqprec * hnpbqb(ji) / ddtb |
|---|
| 132 | |
|---|
| 133 | IF ( l_write ) THEN |
|---|
| 134 | WRITE(numout,*) ' snow falls! ' |
|---|
| 135 | WRITE(numout,*) ' dh_s_prec : ', dh_s_prec(ji) |
|---|
| 136 | WRITE(numout,*) ' flux of h : ', |
|---|
| 137 | & zqprec*hnpbqb(ji) / ddtb |
|---|
| 138 | WRITE(numout,*) ' zqt_s_ini : ', zqt_s_ini / ddtb |
|---|
| 139 | WRITE(numout,*) |
|---|
| 140 | ENDIF |
|---|
| 141 | |
|---|
| 142 | !----------- |
|---|
| 143 | ! Snow melt |
|---|
| 144 | !----------- |
|---|
| 145 | ! Energy available for surface melt |
|---|
| 146 | zqfont_su = ( z_f_surf(ji) + f_s_im(ji) ) * ddtb |
|---|
| 147 | IF ( l_write ) THEN |
|---|
| 148 | WRITE(numout,*) ' snow melts! ' |
|---|
| 149 | WRITE(numout,*) ' z_f_surf(ji) : ', z_f_surf(ji) |
|---|
| 150 | WRITE(numout,*) ' f_s_im : ', f_s_im(ji) |
|---|
| 151 | WRITE(numout,*) ' zqfont_su : ', zqfont_su |
|---|
| 152 | ENDIF |
|---|
| 153 | |
|---|
| 154 | ! Melt of fallen snow |
|---|
| 155 | zdeltah(1) = MIN( 0.0 , - zqfont_su / |
|---|
| 156 | & MAX( zqprec , zeps ) ) |
|---|
| 157 | zqfont_su = MAX( 0.0 , - dh_s_prec(ji) - zdeltah(1) ) * |
|---|
| 158 | & zqprec |
|---|
| 159 | zdeltah(1) = MAX( - dh_s_prec(ji), zdeltah(1) ) |
|---|
| 160 | dh_s_melt(ji) = dh_s_melt(ji) + zdeltah(1) |
|---|
| 161 | |
|---|
| 162 | ! Melt / evaporation of snow |
|---|
| 163 | zswi_evap = 0 |
|---|
| 164 | WRITE(numout,*) ' ln_evap : ', ln_evap |
|---|
| 165 | WRITE(numout,*) ' tdewb : ', tdewb(ji) |
|---|
| 166 | IF ( ln_evap .AND. ( qsfcb(ji) .GT. qabqb(ji) ) .AND. |
|---|
| 167 | & tdewb(ji) .LT. 1. ) zswi_evap = 1 |
|---|
| 168 | |
|---|
| 169 | DO layer = 1, nlay_s ! in case of melting of more than 1 layer |
|---|
| 170 | zlvap = zswi_evap * rhon * ( lvap + cpg * ( tabqb(ji) - tpw ) ) ! MV new evaporation |
|---|
| 171 | |
|---|
| 172 | ! zdeltah(layer) = - zqfont_su / q_s_b(ji,layer) |
|---|
| 173 | zdeltah(layer) = - zqfont_su / ( q_s_b(ji,layer) + zlvap ) |
|---|
| 174 | zqfont_su = MAX( c_zero, - deltaz_s_phy(layer) - |
|---|
| 175 | & zdeltah(layer) ) * |
|---|
| 176 | ! & q_s_b(ji,layer) !MV new evaporation |
|---|
| 177 | & ( q_s_b(ji,layer) + zlvap ) |
|---|
| 178 | zdeltah(layer) = MAX( zdeltah(layer), - deltaz_s_phy(layer) ) |
|---|
| 179 | dh_s_melt(ji) = dh_s_melt(ji) + zdeltah(layer) !resulting melt of snow |
|---|
| 180 | END DO |
|---|
| 181 | |
|---|
| 182 | dh_s_tot(ji) = dh_s_melt(ji) + dh_s_prec(ji) |
|---|
| 183 | |
|---|
| 184 | ! old and new snow thicknesses |
|---|
| 185 | hsold = ht_s_b(ji) |
|---|
| 186 | hsnew = ht_s_b(ji) + dh_s_tot(ji) |
|---|
| 187 | |
|---|
| 188 | ! if snow is still present zhn = 1, else zhn = 0 |
|---|
| 189 | zhn = 1.0 - MAX( c_zero , SIGN( one , - hsnew ) ) |
|---|
| 190 | ht_s_b(ji) = MAX( c_zero , hsnew ) |
|---|
| 191 | |
|---|
| 192 | !++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
|---|
| 193 | ! Conservation test for snow |
|---|
| 194 | zqt_s_fin = q_s_b(ji,1) * ht_s_b(ji) |
|---|
| 195 | zdqt_s = zqt_s_fin - zqt_s_ini |
|---|
| 196 | |
|---|
| 197 | WRITE(numout,*) |
|---|
| 198 | WRITE(numout,*) ' Conservation in snow... ' |
|---|
| 199 | WRITE(numout,*) ' dh_s_melt : ', dh_s_melt(ji) |
|---|
| 200 | WRITE(numout,*) ' dh_s_prec : ', dh_s_prec(ji) |
|---|
| 201 | WRITE(numout,*) ' ht_s_b : ', ht_s_b(ji) |
|---|
| 202 | WRITE(numout,*) ' zqt_s_ini : ', zqt_s_ini / ddtb |
|---|
| 203 | WRITE(numout,*) ' zqt_s_fin : ', zqt_s_fin / ddtb |
|---|
| 204 | WRITE(numout,*) ' zdqt_s : ', zdqt_s / ddtb |
|---|
| 205 | WRITE(numout,*) ' z_f_surf : ', - z_f_surf(ji) |
|---|
| 206 | IF ( zqt_s_fin.GT.0.0 ) THEN |
|---|
| 207 | cons_err = ABS(zdqt_s / ddtb + z_f_surf(ji) ) |
|---|
| 208 | ELSE |
|---|
| 209 | cons_err = ABS(zqt_s_ini / ddtb + zdqt_s / ddtb ) |
|---|
| 210 | ENDIF |
|---|
| 211 | WRITE(numout,*) ' Cons error, snow : ', cons_err |
|---|
| 212 | WRITE(numout,*) |
|---|
| 213 | !++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
|---|
| 214 | |
|---|
| 215 | !------------------ |
|---|
| 216 | ! Ice surface melt |
|---|
| 217 | !------------------ |
|---|
| 218 | IF ( l_write ) WRITE(numout,*) ' ice melts! ' |
|---|
| 219 | |
|---|
| 220 | zzf_surf = zqfont_su / ddtb |
|---|
| 221 | zdqt_i = 0.0 |
|---|
| 222 | dh_i_surf(ji) = 0.0 |
|---|
| 223 | DO layer = 1, nlay_i |
|---|
| 224 | zdeltah(layer) = - zqfont_su / q_i_b(ji,layer) |
|---|
| 225 | zqfont_su = MAX( c_zero , - deltaz_i_phy(layer) |
|---|
| 226 | & - zdeltah(layer) ) * q_i_b(ji,layer) |
|---|
| 227 | zdeltah(layer) = MAX( zdeltah(layer) , - deltaz_i_phy(layer) ) |
|---|
| 228 | dh_i_surf(ji) = dh_i_surf(ji) + zdeltah(layer) !resulting melt of ice |
|---|
| 229 | zdqt_i = zdqt_i + zdeltah(layer) * q_i_b(ji,layer) |
|---|
| 230 | & / ddtb |
|---|
| 231 | END DO |
|---|
| 232 | |
|---|
| 233 | cons_err = ABS( zzf_surf + zdqt_i ) |
|---|
| 234 | |
|---|
| 235 | IF ( l_write ) THEN |
|---|
| 236 | WRITE(numout,*) ' Conservation in sea ice, surface ' |
|---|
| 237 | WRITE(numout,*) ' dh_i_surf: ', dh_i_surf(ji) |
|---|
| 238 | WRITE(numout,*) ' ht_i_b : ', ht_i_b(ji) |
|---|
| 239 | WRITE(numout,*) ' zzf_surf : ', zzf_surf |
|---|
| 240 | WRITE(numout,*) ' zdqt_i : ', zdqt_i |
|---|
| 241 | WRITE(numout,*) ' Cons error, ice : ', cons_err |
|---|
| 242 | WRITE(numout,*) |
|---|
| 243 | ENDIF |
|---|
| 244 | |
|---|
| 245 | ! |
|---|
| 246 | !------------------------------------------------------------------------------| |
|---|
| 247 | ! 3) Sublimation at the surface | |
|---|
| 248 | !------------------------------------------------------------------------------| |
|---|
| 249 | ! |
|---|
| 250 | !------------------ |
|---|
| 251 | ! Snow sublimation |
|---|
| 252 | !------------------ |
|---|
| 253 | |
|---|
| 254 | !------------------ |
|---|
| 255 | ! Ice sublimation |
|---|
| 256 | !------------------ |
|---|
| 257 | |
|---|
| 258 | !------------------- |
|---|
| 259 | ! Snow condensation |
|---|
| 260 | !------------------- |
|---|
| 261 | |
|---|
| 262 | ! THIS IS DEFINITELY WRONG SINCE LATENT HEAT IS ALREADY COUNTED TO |
|---|
| 263 | ! remove heat from the snow pack |
|---|
| 264 | ! ! 4.3) Snow/ice sublimation |
|---|
| 265 | ! ! |
|---|
| 266 | ! ! If fleb is negative, snow condensates at the surface. |
|---|
| 267 | ! ! |
|---|
| 268 | dh_s_subl(ji) = + parsub*fleb(ji)/(rhon*lsub)*ddtb |
|---|
| 269 | dh_s_tot(ji) = dh_s_tot(ji) + dh_s_subl(ji) |
|---|
| 270 | zdhcf = ht_s_b(ji) + dh_s_subl(ji) |
|---|
| 271 | ht_s_b(ji) = MAX(c_zero,zdhcf) |
|---|
| 272 | dh_s_tot(ji) = ht_s_b(ji) - hsold |
|---|
| 273 | dh_i_subl(ji) = - MAX(c_zero,-zdhcf)*rhon/rhog |
|---|
| 274 | |
|---|
| 275 | dh_i_surf(ji) = dh_i_surf(ji) + dh_i_subl(ji) |
|---|
| 276 | |
|---|
| 277 | hsnew = ht_s_b(ji) |
|---|
| 278 | |
|---|
| 279 | IF ( ht_s_b(ji) .LE. 0.0 ) THEN |
|---|
| 280 | dh_s_tot(ji) = MAX( 0.0 , dh_s_tot(ji) ) |
|---|
| 281 | ENDIF |
|---|
| 282 | |
|---|
| 283 | IF ( l_write ) THEN |
|---|
| 284 | WRITE(numout,*) ' Snow sublimation ... ' |
|---|
| 285 | WRITE(numout,*) ' ' |
|---|
| 286 | WRITE(numout,*) ' parsub : ', parsub |
|---|
| 287 | WRITE(numout,*) ' dh_s_subl : ', dh_s_subl(ji) |
|---|
| 288 | WRITE(numout,*) ' dh_i_subl : ', dh_i_subl(ji) |
|---|
| 289 | ENDIF |
|---|
| 290 | |
|---|
| 291 | 40 CONTINUE |
|---|
| 292 | ! |
|---|
| 293 | !------------------------------------------------------------------------------| |
|---|
| 294 | ! 4) Basal growth and melt | |
|---|
| 295 | !------------------------------------------------------------------------------| |
|---|
| 296 | ! |
|---|
| 297 | DO 50 ji = kideb, kiut |
|---|
| 298 | |
|---|
| 299 | IF ( l_write ) THEN |
|---|
| 300 | WRITE(numout,*) ' Basal growth and melt ... ' |
|---|
| 301 | WRITE(numout,*) |
|---|
| 302 | WRITE(numout,*) ' fbbqb : ', fbbqb(ji) |
|---|
| 303 | WRITE(numout,*) ' fc_bo_i : ', fc_bo_i(ji) |
|---|
| 304 | WRITE(numout,*) |
|---|
| 305 | ENDIF |
|---|
| 306 | |
|---|
| 307 | ! formation / melting of ice at the base is determined by the balance of |
|---|
| 308 | ! the conductive heat flux in the ice (fc_bo_i), and the heat fluxes |
|---|
| 309 | ! from the ocean (fbbqb). Conductive heat flux is positive |
|---|
| 310 | ! downwards and fbbq is positive to the ice, i.e., upwards. |
|---|
| 311 | ! Melt/formation rate is modulated by the enthalpy of the bottom ice layer. |
|---|
| 312 | ! accretion of ice at the base |
|---|
| 313 | |
|---|
| 314 | !-------------- |
|---|
| 315 | ! Basal growth |
|---|
| 316 | !-------------- |
|---|
| 317 | IF ( ( fc_bo_i(ji) + fbbqb(ji) ) .LT. 0.0 ) THEN |
|---|
| 318 | |
|---|
| 319 | s_i_new = rn_e_newice * s_w ! New ice salinity (g/kg) |
|---|
| 320 | |
|---|
| 321 | ztmelts = - tmut * s_i_new + tpw ! Melting point in K |
|---|
| 322 | |
|---|
| 323 | ! New ice heat content (Bitz and Lipscomb, 1999) |
|---|
| 324 | ! should be zdE instead |
|---|
| 325 | q_i_b(ji,nlay_i+1) = rhog*( cpg*(tmelts-t_bo_b(ji)) |
|---|
| 326 | & + lfus*( 1.0-(tmelts-tpw) |
|---|
| 327 | & / (t_bo_b(ji) - tpw) ) |
|---|
| 328 | & - cpw*(tmelts-tpw) ) |
|---|
| 329 | |
|---|
| 330 | zE1 = - cpw * ( t_bo_b(ji) - tpw ) ! specific enthalpy of sea water <0 |
|---|
| 331 | zE2 = - q_i_b(ji,nlay_i+1) / rhog ! specific enthalpy of new sea ice <0 |
|---|
| 332 | |
|---|
| 333 | WRITE(numout,*) ' zE1 : ', zE1 |
|---|
| 334 | WRITE(numout,*) ' zE2 : ', zE2 |
|---|
| 335 | |
|---|
| 336 | zdE = zE2 - zE1 ! <0 |
|---|
| 337 | |
|---|
| 338 | WRITE(numout,*) ' zdE : ', zdE |
|---|
| 339 | |
|---|
| 340 | dh_i_bott(ji) = ddtb*(fc_bo_i(ji) + fbbqb(ji) ) |
|---|
| 341 | & / ( zdE * rhog ) |
|---|
| 342 | |
|---|
| 343 | ! salt flux due to initial salt entrapment (keep ?) |
|---|
| 344 | fsbp = s_w * ( 1. - rn_e_newice ) * dh_i_bott(ji) / ddtb * |
|---|
| 345 | & rhog / 1000. |
|---|
| 346 | |
|---|
| 347 | IF ( l_write ) WRITE(numout,*) ' dh_i_bott : ', dh_i_bott(ji) |
|---|
| 348 | |
|---|
| 349 | ENDIF |
|---|
| 350 | |
|---|
| 351 | !----------------- |
|---|
| 352 | ! Basal melt |
|---|
| 353 | !----------------- |
|---|
| 354 | IF ( ( fc_bo_i(ji) + fbbqb(ji) ) .GE. 0.0 ) THEN |
|---|
| 355 | |
|---|
| 356 | IF ( l_write ) WRITE(numout,*) ' Energy available for |
|---|
| 357 | & basal melt : ', |
|---|
| 358 | & fc_bo_i(ji) + fbbqb(ji) |
|---|
| 359 | |
|---|
| 360 | zqfont_bo = ddtb * ( fc_bo_i(ji) + fbbqb(ji) ) |
|---|
| 361 | zzf_base = zqfont_bo / ddtb |
|---|
| 362 | zdqt_i = 0.0 |
|---|
| 363 | |
|---|
| 364 | IF ( l_write ) WRITE(numout,*) ' zqfont_bo : ', zqfont_bo |
|---|
| 365 | |
|---|
| 366 | dh_i_bott(ji) = 0.0 |
|---|
| 367 | DO layer = nlay_i, 1, -1 |
|---|
| 368 | zdeltah(layer) = - zqfont_bo / q_i_b(ji,layer) |
|---|
| 369 | zqfont_bo = MAX ( 0.0 , - deltaz_i_phy(layer) - |
|---|
| 370 | & zdeltah(layer) ) |
|---|
| 371 | & * q_i_b(ji,layer) |
|---|
| 372 | dh_i_bott(ji) = dh_i_bott(ji) + zdeltah(layer) |
|---|
| 373 | zdqt_i = zdqt_i + zdeltah(layer) * |
|---|
| 374 | & q_i_b(ji,layer) / ddtb |
|---|
| 375 | END DO |
|---|
| 376 | |
|---|
| 377 | IF ( l_write ) WRITE(numout,*) ' dh_i_bott : ', dh_i_bott(ji) |
|---|
| 378 | |
|---|
| 379 | cons_err = ABS( zzf_base + zdqt_i ) |
|---|
| 380 | |
|---|
| 381 | IF ( l_write ) THEN |
|---|
| 382 | WRITE(numout,*) ' Conservation in sea ice, base ' |
|---|
| 383 | WRITE(numout,*) ' dh_i_bott: ', dh_i_bott(ji) |
|---|
| 384 | WRITE(numout,*) ' ht_i_b : ', ht_i_b(ji) |
|---|
| 385 | WRITE(numout,*) ' zzf_base : ', zzf_base |
|---|
| 386 | WRITE(numout,*) ' zdqt_i : ', zdqt_i |
|---|
| 387 | ! WRITE(numout,*) ' Conservation error ice surface : ', |
|---|
| 388 | ! & cons_err |
|---|
| 389 | ! WRITE(numout,*) |
|---|
| 390 | ENDIF |
|---|
| 391 | |
|---|
| 392 | ENDIF |
|---|
| 393 | |
|---|
| 394 | ! It can be than an internal temperature is greater than melt point |
|---|
| 395 | ! then, see lim3 for correction |
|---|
| 396 | |
|---|
| 397 | ! new ice thickness |
|---|
| 398 | zhgnew = ht_i_b(ji) + dh_i_surf(ji) + dh_i_bott(ji) |
|---|
| 399 | old_ht_i_b(ji) = ht_i_b(ji) |
|---|
| 400 | |
|---|
| 401 | ht_i_b(ji) = zhgnew |
|---|
| 402 | |
|---|
| 403 | 50 CONTINUE |
|---|
| 404 | |
|---|
| 405 | ! |
|---|
| 406 | !------------------------------------------------------------------------------| |
|---|
| 407 | ! 5) Formation of snow-ice | |
|---|
| 408 | !------------------------------------------------------------------------------| |
|---|
| 409 | ! |
|---|
| 410 | ! When snow load excesses Archimede's limit, snow-ice interface goes down |
|---|
| 411 | ! under sea-level, flooding of seawater transforms snow into ice |
|---|
| 412 | ! dh_snowice is positive for the ice |
|---|
| 413 | |
|---|
| 414 | DO 70 ji = kideb, kiut |
|---|
| 415 | |
|---|
| 416 | dh_snowice(ji) = MAX( c_zero , ( rhon * ht_s_b(ji) + (rhog -rho0 ) |
|---|
| 417 | & * ht_i_b(ji)) / ( rhon + rho0 - rhog ) ) |
|---|
| 418 | |
|---|
| 419 | zhgnew = MAX( zhgnew , zhgnew + dh_snowice(ji) ) |
|---|
| 420 | zhnnew = MIN( ht_s_b(ji) , ht_s_b(ji) - dh_snowice(ji) ) |
|---|
| 421 | |
|---|
| 422 | ht_s_b(ji) = zhnnew |
|---|
| 423 | ht_i_b(ji) = zhgnew |
|---|
| 424 | |
|---|
| 425 | IF ( l_write ) THEN |
|---|
| 426 | WRITE(numout,*) ' dh_snowice : ', dh_snowice(ji) |
|---|
| 427 | WRITE(numout,*) |
|---|
| 428 | WRITE(numout,*) ' At the end of the routine ... ' |
|---|
| 429 | WRITE(numout,*) ' ht_s_b : ', ht_s_b(ji) |
|---|
| 430 | WRITE(numout,*) ' ht_i_b : ', ht_i_b(ji) |
|---|
| 431 | ENDIF |
|---|
| 432 | |
|---|
| 433 | ! give a minimum snow depth |
|---|
| 434 | zhsnmin = 1.0e-10 |
|---|
| 435 | isnow = 0 |
|---|
| 436 | IF ( ht_s_b(ji) .GT. zhsnmin ) isnow = 1 |
|---|
| 437 | ht_s_b(ji) = isnow * ht_s_b(ji) |
|---|
| 438 | |
|---|
| 439 | !--- Remove --- |
|---|
| 440 | WRITE(numout,*) ' dh_i_bott : ', dh_i_bott(ji) |
|---|
| 441 | WRITE(numout,*) ' dh_i_surf : ', dh_i_surf(ji) |
|---|
| 442 | WRITE(numout,*) ' dh_i_snowice : ', dh_snowice(ji) |
|---|
| 443 | WRITE(numout,*) ' dh_s_melt : ', dh_s_melt(ji) |
|---|
| 444 | !--- Remove --- |
|---|
| 445 | |
|---|
| 446 | 70 CONTINUE |
|---|
| 447 | |
|---|
| 448 | RETURN |
|---|
| 449 | |
|---|
| 450 | !------------------------------------------------------------------------------| |
|---|
| 451 | ! Fin de la subroutine ice_th_dh |
|---|
| 452 | END SUBROUTINE |
|---|
![(please configure the [header_logo] section in trac.ini)](/lim1d/chrome/site/your_project_logo.png){kind=logo}
