[825] | 1 | MODULE limthd_sal |
---|
| 2 | !!====================================================================== |
---|
| 3 | !! *** MODULE limthd_sal *** |
---|
[2475] | 4 | !! LIM-3 sea-ice : computation of salinity variations in the ice |
---|
[825] | 5 | !!====================================================================== |
---|
[2475] | 6 | !! History : - ! 2003-05 (M. Vancoppenolle) UCL-ASTR first coding for LIM3-1D |
---|
| 7 | !! 3.0 ! 2005-12 (M. Vancoppenolle) adapted to the 3-D version |
---|
| 8 | !!--------------------------------------------------------------------- |
---|
[888] | 9 | #if defined key_lim3 |
---|
[825] | 10 | !!---------------------------------------------------------------------- |
---|
[2475] | 11 | !! 'key_lim3' LIM-3 sea-ice model |
---|
| 12 | !!---------------------------------------------------------------------- |
---|
[825] | 13 | !! lim_thd_sal : salinity variations in the ice |
---|
[2475] | 14 | !!---------------------------------------------------------------------- |
---|
[825] | 15 | USE par_oce ! ocean parameters |
---|
| 16 | USE phycst ! physical constants (ocean directory) |
---|
[888] | 17 | USE sbc_oce ! Surface boundary condition: ocean fields |
---|
[2475] | 18 | USE ice ! LIM: sea-ice variables |
---|
| 19 | USE par_ice ! LIM: sea-ice parameters |
---|
| 20 | USE thd_ice ! LIM: sea-ice thermodynamics |
---|
| 21 | USE limvar ! LIM: sea-ice variables |
---|
| 22 | USE in_out_manager ! I/O manager |
---|
[825] | 23 | |
---|
| 24 | IMPLICIT NONE |
---|
| 25 | PRIVATE |
---|
| 26 | |
---|
[2475] | 27 | PUBLIC lim_thd_sal ! called by limthd module |
---|
| 28 | PUBLIC lim_thd_sal_init ! called by iceini module |
---|
[825] | 29 | |
---|
[1156] | 30 | !!---------------------------------------------------------------------- |
---|
[2287] | 31 | !! NEMO/LIM3 3.3 , UCL - NEMO Consortium (2010) |
---|
[1156] | 32 | !! $Id$ |
---|
[2475] | 33 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
---|
[1156] | 34 | !!---------------------------------------------------------------------- |
---|
[921] | 35 | CONTAINS |
---|
[825] | 36 | |
---|
[2475] | 37 | SUBROUTINE lim_thd_sal( kideb, kiut ) |
---|
[825] | 38 | !!------------------------------------------------------------------- |
---|
[2475] | 39 | !! *** ROUTINE lim_thd_sal *** |
---|
| 40 | !! |
---|
| 41 | !! ** Purpose : computes new salinities in the ice |
---|
[825] | 42 | !! |
---|
| 43 | !! ** Method : 4 possibilities |
---|
| 44 | !! -> num_sal = 1 -> constant salinity for z,t |
---|
| 45 | !! -> num_sal = 2 -> S = S(z,t) [simple Vancoppenolle et al 2005] |
---|
| 46 | !! -> num_sal = 3 -> S = S(z) [multiyear ice] |
---|
| 47 | !! -> num_sal = 4 -> S = S(h) [Cox and Weeks 74] |
---|
| 48 | !!--------------------------------------------------------------------- |
---|
[2475] | 49 | INTEGER, INTENT(in) :: kideb, kiut ! thickness category index |
---|
| 50 | ! |
---|
| 51 | INTEGER :: ji, jk ! dummy loop indices |
---|
| 52 | INTEGER :: zji, zjj ! local integers |
---|
| 53 | REAL(wp) :: zsold, zeps, iflush, iaccrbo, igravdr, isnowic, i_ice_switch, ztmelts ! local scalars |
---|
| 54 | REAL(wp) :: zaaa, zbbb, zccc, zdiscrim ! local scalars |
---|
| 55 | REAL(wp), DIMENSION(jpij) :: ze_init, zhiold, zsiold ! 1D workspace |
---|
| 56 | !!--------------------------------------------------------------------- |
---|
[825] | 57 | |
---|
[2475] | 58 | zeps=1.0e-06_wp |
---|
[825] | 59 | |
---|
[921] | 60 | !------------------------------------------------------------------------------| |
---|
| 61 | ! 1) Constant salinity, constant in time | |
---|
| 62 | !------------------------------------------------------------------------------| |
---|
[825] | 63 | |
---|
[2475] | 64 | IF( num_sal == 1 ) THEN |
---|
[825] | 65 | DO jk = 1, nlay_i |
---|
| 66 | DO ji = kideb, kiut |
---|
| 67 | s_i_b(ji,jk) = bulk_sal |
---|
| 68 | END DO ! ji |
---|
| 69 | END DO ! jk |
---|
[2475] | 70 | ! |
---|
[825] | 71 | DO ji = kideb, kiut |
---|
| 72 | sm_i_b(ji) = bulk_sal |
---|
| 73 | END DO ! ji |
---|
[2475] | 74 | ! |
---|
| 75 | ENDIF |
---|
[825] | 76 | |
---|
[921] | 77 | !------------------------------------------------------------------------------| |
---|
| 78 | ! Module 2 : Constant salinity varying in time | |
---|
| 79 | !------------------------------------------------------------------------------| |
---|
[825] | 80 | |
---|
| 81 | IF ( ( num_sal .EQ. 2 ) .OR. ( num_sal .EQ. 4 ) ) THEN |
---|
| 82 | |
---|
[921] | 83 | ! WRITE(numout,*) |
---|
| 84 | ! WRITE(numout,*) 'lim_thd_sal : Ice salinity computation module ', & |
---|
| 85 | ! num_sal |
---|
| 86 | ! WRITE(numout,*) '~~~~~~~~~~~' |
---|
| 87 | ! WRITE(numout,*) |
---|
[825] | 88 | |
---|
| 89 | !--------------------------------- |
---|
| 90 | ! Thickness at previous time step |
---|
| 91 | !--------------------------------- |
---|
| 92 | DO ji = kideb, kiut |
---|
| 93 | zhiold(ji) = ht_i_b(ji) - dh_i_bott(ji) - dh_snowice(ji) - & |
---|
[921] | 94 | dh_i_surf(ji) |
---|
[825] | 95 | END DO ! ji |
---|
| 96 | |
---|
| 97 | !--------------------- |
---|
| 98 | ! Global heat content |
---|
| 99 | !--------------------- |
---|
| 100 | |
---|
| 101 | ze_init(:) = 0.0 |
---|
| 102 | DO jk = 1, nlay_i |
---|
| 103 | DO ji = kideb, kiut |
---|
| 104 | ze_init(ji) = ze_init(ji) + q_i_b(ji,jk) * ht_i_b(ji) / nlay_i |
---|
| 105 | END DO ! ji |
---|
| 106 | END DO ! jk |
---|
| 107 | |
---|
| 108 | DO ji = kideb, kiut |
---|
| 109 | |
---|
| 110 | !---------- |
---|
| 111 | ! Switches |
---|
| 112 | !---------- |
---|
| 113 | |
---|
| 114 | ! iflush : 1 if summer |
---|
| 115 | iflush = MAX( 0.0 , SIGN ( 1.0 , t_su_b(ji) - rtt ) ) |
---|
| 116 | ! igravdr : 1 if t_su lt t_bo |
---|
| 117 | igravdr = MAX( 0.0 , SIGN ( 1.0 , t_bo_b(ji) - t_su_b(ji) ) ) |
---|
| 118 | ! iaccrbo : 1 if bottom accretion |
---|
| 119 | iaccrbo = MAX( 0.0 , SIGN ( 1.0 , dh_i_bott(ji) ) ) |
---|
| 120 | ! isnowic : 1 if snow ice formation |
---|
[842] | 121 | i_ice_switch = 1.0 - MAX ( 0.0 , SIGN ( 1.0 , - ht_i_b(ji) + 1.0e-2 ) ) |
---|
[2475] | 122 | isnowic = 1.0 - MAX ( 0.0 , SIGN ( 1.0 , - dh_snowice(ji) ) ) * i_ice_switch |
---|
[825] | 123 | |
---|
| 124 | !--------------------- |
---|
| 125 | ! Salinity tendencies |
---|
| 126 | !--------------------- |
---|
| 127 | |
---|
| 128 | ! drainage by gravity drainage |
---|
[2475] | 129 | dsm_i_gd_1d(ji) = - igravdr * MAX( sm_i_b(ji) - sal_G , 0._wp ) / time_G * rdt_ice |
---|
[825] | 130 | |
---|
| 131 | ! drainage by flushing |
---|
[2475] | 132 | dsm_i_fl_1d(ji) = - iflush * MAX( sm_i_b(ji) - sal_F , 0._wp ) / time_F * rdt_ice |
---|
[825] | 133 | |
---|
| 134 | !----------------- |
---|
| 135 | ! Update salinity |
---|
| 136 | !----------------- |
---|
| 137 | |
---|
| 138 | ! only drainage terms ( gravity drainage and flushing ) |
---|
| 139 | ! snow ice / bottom sources are added in lim_thd_ent |
---|
| 140 | ! to conserve energy |
---|
| 141 | zsiold(ji) = sm_i_b(ji) |
---|
[2475] | 142 | sm_i_b(ji) = sm_i_b(ji) + dsm_i_fl_1d(ji) + dsm_i_gd_1d(ji) |
---|
[825] | 143 | |
---|
| 144 | ! if no ice, salinity eq 0.1 |
---|
[2475] | 145 | i_ice_switch = 1._wp - MAX ( 0._wp, SIGN( 1._wp , - ht_i_b(ji) ) ) |
---|
| 146 | sm_i_b(ji) = i_ice_switch*sm_i_b(ji) + s_i_min * ( 1._wp - i_ice_switch ) |
---|
[825] | 147 | END DO ! ji |
---|
| 148 | |
---|
| 149 | ! Salinity profile |
---|
[2475] | 150 | CALL lim_var_salprof1d( kideb, kiut ) |
---|
[825] | 151 | |
---|
| 152 | !---------------------------- |
---|
| 153 | ! Heat flux - brine drainage |
---|
| 154 | !---------------------------- |
---|
| 155 | |
---|
| 156 | DO ji = kideb, kiut |
---|
| 157 | ! iflush : 1 if summer |
---|
[2475] | 158 | iflush = MAX( 0._wp , SIGN ( 1._wp , t_su_b(ji) - rtt ) ) |
---|
[825] | 159 | ! igravdr : 1 if t_su lt t_bo |
---|
[2475] | 160 | igravdr = MAX( 0._wp , SIGN ( 1._wp , t_bo_b(ji) - t_su_b(ji) ) ) |
---|
[825] | 161 | ! iaccrbo : 1 if bottom accretion |
---|
[2475] | 162 | iaccrbo = MAX( 0._wp , SIGN ( 1._wp , dh_i_bott(ji) ) ) |
---|
| 163 | ! |
---|
| 164 | fhbri_1d(ji) = 0._wp |
---|
[825] | 165 | END DO ! ji |
---|
| 166 | |
---|
| 167 | !---------------------------- |
---|
| 168 | ! Salt flux - brine drainage |
---|
| 169 | !---------------------------- |
---|
| 170 | DO ji = kideb, kiut |
---|
[2475] | 171 | i_ice_switch = 1._wp - MAX ( 0._wp, SIGN( 1._wp , - ht_i_b(ji) ) ) |
---|
| 172 | fsbri_1d(ji) = fsbri_1d(ji) - i_ice_switch * rhoic * a_i_b(ji) * ht_i_b(ji) & |
---|
| 173 | & * ( MAX(dsm_i_gd_1d(ji) + dsm_i_fl_1d(ji), sm_i_b(ji) - zsiold(ji) ) ) / rdt_ice |
---|
| 174 | IF( num_sal == 4 ) fsbri_1d(ji) = 0._wp |
---|
[825] | 175 | END DO ! ji |
---|
| 176 | |
---|
| 177 | ! Only necessary for conservation check since salinity is modified |
---|
| 178 | !-------------------- |
---|
| 179 | ! Temperature update |
---|
| 180 | !-------------------- |
---|
| 181 | DO jk = 1, nlay_i |
---|
| 182 | DO ji = kideb, kiut |
---|
| 183 | ztmelts = -tmut*s_i_b(ji,jk) + rtt |
---|
| 184 | !Conversion q(S,T) -> T (second order equation) |
---|
| 185 | zaaa = cpic |
---|
[2475] | 186 | zbbb = ( rcp - cpic ) * ( ztmelts - rtt ) + q_i_b(ji,jk) / rhoic - lfus |
---|
[825] | 187 | zccc = lfus * ( ztmelts - rtt ) |
---|
| 188 | zdiscrim = SQRT( MAX(zbbb*zbbb - 4.0*zaaa*zccc,0.0) ) |
---|
[2475] | 189 | t_i_b(ji,jk) = rtt - ( zbbb + zdiscrim ) / ( 2.0 *zaaa ) |
---|
[825] | 190 | END DO !ji |
---|
| 191 | END DO !jk |
---|
[2475] | 192 | ! |
---|
[825] | 193 | ENDIF ! num_sal .EQ. 2 |
---|
| 194 | |
---|
[921] | 195 | !------------------------------------------------------------------------------| |
---|
| 196 | ! Module 3 : Profile of salinity, constant in time | |
---|
| 197 | !------------------------------------------------------------------------------| |
---|
[825] | 198 | |
---|
[2475] | 199 | IF( num_sal .EQ. 3 ) THEN |
---|
[825] | 200 | |
---|
| 201 | WRITE(numout,*) |
---|
| 202 | WRITE(numout,*) 'lim_thd_sal : Ice salinity computation module ', & |
---|
[921] | 203 | num_sal |
---|
[825] | 204 | WRITE(numout,*) '~~~~~~~~~~~~' |
---|
| 205 | |
---|
| 206 | CALL lim_var_salprof1d(kideb,kiut) |
---|
| 207 | |
---|
| 208 | ENDIF ! num_sal .EQ. 3 |
---|
| 209 | |
---|
[921] | 210 | !------------------------------------------------------------------------------| |
---|
| 211 | ! Module 4 : Constant salinity varying in time | |
---|
| 212 | !------------------------------------------------------------------------------| |
---|
[825] | 213 | |
---|
| 214 | ! Cox and Weeks, 1974 |
---|
| 215 | IF (num_sal.eq.5) THEN |
---|
| 216 | |
---|
| 217 | WRITE(numout,*) |
---|
| 218 | WRITE(numout,*) 'lim_thd_sal : Ice salinity computation module ', & |
---|
[921] | 219 | num_sal |
---|
[825] | 220 | WRITE(numout,*) '~~~~~~~~~~~~' |
---|
| 221 | |
---|
| 222 | DO ji = kideb, kiut |
---|
| 223 | |
---|
| 224 | zsold = sm_i_b(ji) |
---|
| 225 | |
---|
| 226 | IF (ht_i_b(ji).lt.0.4) THEN |
---|
| 227 | sm_i_b(ji) = 14.24 - 19.39*ht_i_b(ji) |
---|
| 228 | ELSE |
---|
| 229 | sm_i_b(ji) = 7.88 - 1.59*ht_i_b(ji) |
---|
| 230 | sm_i_b(ji) = MIN(sm_i_b(ji),zsold) |
---|
| 231 | ENDIF |
---|
[921] | 232 | |
---|
[825] | 233 | IF ( ht_i_b(ji) .GT. 3.06918239 ) THEN |
---|
| 234 | sm_i_b(ji) = 3.0 |
---|
| 235 | ENDIF |
---|
| 236 | |
---|
| 237 | DO jk = 1, nlay_i |
---|
| 238 | s_i_b(ji,jk) = sm_i_b(ji) |
---|
| 239 | END DO |
---|
[921] | 240 | |
---|
[825] | 241 | END DO ! ji |
---|
| 242 | |
---|
| 243 | ENDIF ! num_sal |
---|
| 244 | |
---|
[921] | 245 | !------------------------------------------------------------------------------| |
---|
| 246 | ! 5) Computation of salt flux due to Bottom growth |
---|
| 247 | !------------------------------------------------------------------------------| |
---|
[825] | 248 | |
---|
| 249 | IF ( num_sal .EQ. 4 ) THEN |
---|
| 250 | DO ji = kideb, kiut |
---|
| 251 | zji = MOD( npb(ji) - 1, jpi ) + 1 |
---|
| 252 | zjj = ( npb(ji) - 1 ) / jpi + 1 |
---|
[2475] | 253 | fseqv_1d(ji) = fseqv_1d(ji) + ( sss_m(zji,zjj) - bulk_sal ) & |
---|
| 254 | & * rhoic * a_i_b(ji) * MAX( dh_i_bott(ji) , 0.0 ) / rdt_ice |
---|
[825] | 255 | END DO |
---|
| 256 | ELSE |
---|
| 257 | DO ji = kideb, kiut |
---|
| 258 | zji = MOD( npb(ji) - 1, jpi ) + 1 |
---|
| 259 | zjj = ( npb(ji) - 1 ) / jpi + 1 |
---|
[2475] | 260 | fseqv_1d(ji) = fseqv_1d(ji) + ( sss_m(zji,zjj) - s_i_new(ji) ) & |
---|
| 261 | & * rhoic * a_i_b(ji) * MAX( dh_i_bott(ji) , 0.0 ) / rdt_ice |
---|
[825] | 262 | END DO ! ji |
---|
| 263 | ENDIF |
---|
[2475] | 264 | ! |
---|
[825] | 265 | END SUBROUTINE lim_thd_sal |
---|
| 266 | |
---|
[2475] | 267 | |
---|
[825] | 268 | SUBROUTINE lim_thd_sal_init |
---|
| 269 | !!------------------------------------------------------------------- |
---|
| 270 | !! *** ROUTINE lim_thd_sal_init *** |
---|
| 271 | !! |
---|
| 272 | !! ** Purpose : initialization of ice salinity parameters |
---|
| 273 | !! |
---|
[2475] | 274 | !! ** Method : Read the namicesal namelist and check the parameter |
---|
| 275 | !! values called at the first timestep (nit000) |
---|
[825] | 276 | !! |
---|
| 277 | !! ** input : Namelist namicesal |
---|
| 278 | !!------------------------------------------------------------------- |
---|
[2475] | 279 | NAMELIST/namicesal/ num_sal, bulk_sal, sal_G, time_G, sal_F, time_F, & |
---|
| 280 | & s_i_max, s_i_min, s_i_0, s_i_1 |
---|
[825] | 281 | !!------------------------------------------------------------------- |
---|
[2475] | 282 | ! |
---|
| 283 | REWIND( numnam_ice ) ! Read Namelist namicesal |
---|
| 284 | READ ( numnam_ice , namicesal ) |
---|
| 285 | ! |
---|
| 286 | IF(lwp) THEN ! control print |
---|
[825] | 287 | WRITE(numout,*) |
---|
| 288 | WRITE(numout,*) 'lim_thd_sal_init : Ice parameters for salinity ' |
---|
| 289 | WRITE(numout,*) '~~~~~~~~~~~~~~~~' |
---|
| 290 | WRITE(numout,*) ' switch for salinity num_sal : ', num_sal |
---|
| 291 | WRITE(numout,*) ' bulk salinity value if num_sal = 1 : ', bulk_sal |
---|
| 292 | WRITE(numout,*) ' restoring salinity for GD : ', sal_G |
---|
| 293 | WRITE(numout,*) ' restoring time for GD : ', time_G |
---|
| 294 | WRITE(numout,*) ' restoring salinity for flushing : ', sal_F |
---|
| 295 | WRITE(numout,*) ' restoring time for flushing : ', time_F |
---|
| 296 | WRITE(numout,*) ' Maximum tolerated ice salinity : ', s_i_max |
---|
| 297 | WRITE(numout,*) ' Minimum tolerated ice salinity : ', s_i_min |
---|
| 298 | WRITE(numout,*) ' 1st salinity for salinity profile : ', s_i_0 |
---|
| 299 | WRITE(numout,*) ' 2nd salinity for salinity profile : ', s_i_1 |
---|
| 300 | ENDIF |
---|
[2475] | 301 | ! |
---|
[825] | 302 | END SUBROUTINE lim_thd_sal_init |
---|
| 303 | |
---|
| 304 | #else |
---|
| 305 | !!---------------------------------------------------------------------- |
---|
[2475] | 306 | !! Default option Dummy Module No LIM-3 sea-ice model |
---|
[825] | 307 | !!---------------------------------------------------------------------- |
---|
| 308 | #endif |
---|
| 309 | !!====================================================================== |
---|
| 310 | END MODULE limthd_sal |
---|