[821] | 1 | MODULE limdyn_2 |
---|
[3] | 2 | !!====================================================================== |
---|
[821] | 3 | !! *** MODULE limdyn_2 *** |
---|
[3] | 4 | !! Sea-Ice dynamics : |
---|
| 5 | !!====================================================================== |
---|
[888] | 6 | !! History : 1.0 ! 01-04 (LIM) Original code |
---|
| 7 | !! 2.0 ! 02-08 (C. Ethe, G. Madec) F90, mpp |
---|
| 8 | !! 2.0 ! 03-08 (C. Ethe) add lim_dyn_init |
---|
| 9 | !! 2.0 ! 06-07 (G. Madec) Surface module |
---|
[2095] | 10 | !! 3.3 ! 09-05 (G.Garric, C. Bricaud) addition of the lim2_evp case |
---|
[888] | 11 | !!--------------------------------------------------------------------- |
---|
[821] | 12 | #if defined key_lim2 |
---|
[3] | 13 | !!---------------------------------------------------------------------- |
---|
[821] | 14 | !! 'key_lim2' : LIM 2.0 sea-ice model |
---|
[3] | 15 | !!---------------------------------------------------------------------- |
---|
[821] | 16 | !! lim_dyn_2 : computes ice velocities |
---|
| 17 | !! lim_dyn_init_2 : initialization and namelist read |
---|
[3] | 18 | !!---------------------------------------------------------------------- |
---|
[2095] | 19 | USE dom_oce ! ocean domain |
---|
| 20 | USE sbc_oce ! surface boundary condition variables |
---|
| 21 | USE phycst ! physical constant |
---|
| 22 | USE ice_2 ! LIM2: ice variables |
---|
| 23 | USE dom_ice_2 ! LIM2: ice domain |
---|
| 24 | USE limistate_2 ! LIM2: ice initial state |
---|
[2046] | 25 | #if defined key_lim2_vp |
---|
[2095] | 26 | USE limrhg_2 ! LIM2: VP ice rheology |
---|
[2046] | 27 | #else |
---|
[2095] | 28 | USE limrhg ! LIM : EVP ice rheology |
---|
[2046] | 29 | #endif |
---|
[2095] | 30 | USE lbclnk ! lateral boundary condition - MPP exchanges |
---|
| 31 | USE lib_mpp ! MPP library |
---|
| 32 | USE in_out_manager ! I/O manager |
---|
| 33 | USE prtctl ! Print control |
---|
[888] | 34 | |
---|
[3] | 35 | IMPLICIT NONE |
---|
| 36 | PRIVATE |
---|
| 37 | |
---|
[2095] | 38 | PUBLIC lim_dyn_2 ! routine called by sbc_ice_lim module |
---|
[3] | 39 | |
---|
[2095] | 40 | REAL(wp) :: rone = 1.e0 ! constant value |
---|
[3] | 41 | |
---|
[888] | 42 | # include "vectopt_loop_substitute.h90" |
---|
[3] | 43 | !!---------------------------------------------------------------------- |
---|
[2095] | 44 | !! NEMO/LIM2 3.3, UCL-LOCEAN-IPSL (2010) |
---|
[1156] | 45 | !! $Id$ |
---|
[888] | 46 | !! Software governed by the CeCILL licence (modipsl/doc/NEMO_CeCILL.txt) |
---|
[3] | 47 | !!---------------------------------------------------------------------- |
---|
| 48 | CONTAINS |
---|
| 49 | |
---|
[821] | 50 | SUBROUTINE lim_dyn_2( kt ) |
---|
[3] | 51 | !!------------------------------------------------------------------- |
---|
[821] | 52 | !! *** ROUTINE lim_dyn_2 *** |
---|
[3] | 53 | !! |
---|
[888] | 54 | !! ** Purpose : compute ice velocity and ocean-ice friction velocity |
---|
[3] | 55 | !! |
---|
| 56 | !! ** Method : |
---|
| 57 | !! |
---|
| 58 | !! ** Action : - Initialisation |
---|
| 59 | !! - Call of the dynamic routine for each hemisphere |
---|
[888] | 60 | !! - computation of the friction velocity at the sea-ice base |
---|
[3] | 61 | !! - treatment of the case if no ice dynamic |
---|
| 62 | !!--------------------------------------------------------------------- |
---|
[508] | 63 | INTEGER, INTENT(in) :: kt ! number of iteration |
---|
[888] | 64 | !! |
---|
| 65 | INTEGER :: ji, jj ! dummy loop indices |
---|
| 66 | INTEGER :: i_j1, i_jpj ! Starting/ending j-indices for rheology |
---|
| 67 | REAL(wp) :: zcoef ! temporary scalar |
---|
| 68 | REAL(wp), DIMENSION(jpj) :: zind ! i-averaged indicator of sea-ice |
---|
| 69 | REAL(wp), DIMENSION(jpj) :: zmsk ! i-averaged of tmask |
---|
| 70 | REAL(wp), DIMENSION(jpi,jpj) :: zu_io, zv_io ! ice-ocean velocity |
---|
[3] | 71 | !!--------------------------------------------------------------------- |
---|
| 72 | |
---|
[888] | 73 | IF( kt == nit000 ) CALL lim_dyn_init_2 ! Initialization (first time-step only) |
---|
[3] | 74 | |
---|
[2095] | 75 | IF( ln_limdyn ) THEN ! Rheology (ice dynamics) |
---|
| 76 | ! ! ======== |
---|
| 77 | ! |
---|
| 78 | hsnm(:,:) = ( 1.0 - frld(:,:) ) * hsnif(:,:) ! Mean ice and snow thicknesses |
---|
[3] | 79 | hicm(:,:) = ( 1.0 - frld(:,:) ) * hicif(:,:) |
---|
[888] | 80 | ! |
---|
[2095] | 81 | ! ! Define the j-limits where ice rheology is computed |
---|
[76] | 82 | |
---|
[2095] | 83 | IF( lk_mpp .OR. nbit_cmp == 1 ) THEN !== mpp: compute over the whole domain ==! |
---|
[76] | 84 | i_j1 = 1 |
---|
| 85 | i_jpj = jpj |
---|
[888] | 86 | IF(ln_ctl) CALL prt_ctl_info( 'lim_dyn : i_j1 = ', ivar1=i_j1, clinfo2=' ij_jpj = ', ivar2=i_jpj ) |
---|
[2046] | 87 | #if defined key_lim2_vp |
---|
[2095] | 88 | CALL lim_rhg_2( i_j1, i_jpj ) ! VP rheology |
---|
[2046] | 89 | #else |
---|
[2095] | 90 | CALL lim_rhg ( i_j1, i_jpj ) ! EVP rheology |
---|
[2046] | 91 | #endif |
---|
[2095] | 92 | ELSE !== optimization of the computational area ==! |
---|
[76] | 93 | DO jj = 1, jpj |
---|
[2095] | 94 | zind(jj) = SUM( frld (:,jj ) ) ! = FLOAT(jpj) if ocean everywhere on a j-line |
---|
| 95 | zmsk(jj) = SUM( tmask(:,jj,1) ) ! = 0 if land everywhere on a j-line |
---|
[76] | 96 | END DO |
---|
[888] | 97 | ! |
---|
[2095] | 98 | IF( l_jeq ) THEN ! local domain include both hemisphere: rheology is computed |
---|
| 99 | ! ! in each hemisphere only over the ice cover latitude strip |
---|
| 100 | i_j1 = njeq ! Northern hemisphere |
---|
[76] | 101 | i_jpj = jpj |
---|
| 102 | DO WHILE ( i_j1 <= jpj .AND. zind(i_j1) == FLOAT(jpi) .AND. zmsk(i_j1) /=0 ) |
---|
| 103 | i_j1 = i_j1 + 1 |
---|
| 104 | END DO |
---|
[2046] | 105 | #if defined key_lim2_vp |
---|
[76] | 106 | i_j1 = MAX( 1, i_j1-1 ) |
---|
[258] | 107 | IF(ln_ctl) WRITE(numout,*) 'lim_dyn : NH i_j1 = ', i_j1, ' ij_jpj = ', i_jpj |
---|
[888] | 108 | ! |
---|
[821] | 109 | CALL lim_rhg_2( i_j1, i_jpj ) |
---|
[2046] | 110 | #else |
---|
| 111 | i_j1 = MAX( 1, i_j1-2 ) |
---|
| 112 | IF(ln_ctl) WRITE(numout,*) 'lim_dyn : NH i_j1 = ', i_j1, ' ij_jpj = ', i_jpj |
---|
| 113 | CALL lim_rhg( i_j1, i_jpj ) |
---|
| 114 | #endif |
---|
[2095] | 115 | i_j1 = 1 ! Southern hemisphere |
---|
[76] | 116 | i_jpj = njeq |
---|
| 117 | DO WHILE ( i_jpj >= 1 .AND. zind(i_jpj) == FLOAT(jpi) .AND. zmsk(i_jpj) /=0 ) |
---|
| 118 | i_jpj = i_jpj - 1 |
---|
| 119 | END DO |
---|
[2046] | 120 | #if defined key_lim2_vp |
---|
[76] | 121 | i_jpj = MIN( jpj, i_jpj+2 ) |
---|
[258] | 122 | IF(ln_ctl) WRITE(numout,*) 'lim_dyn : SH i_j1 = ', i_j1, ' ij_jpj = ', i_jpj |
---|
[888] | 123 | ! |
---|
[821] | 124 | CALL lim_rhg_2( i_j1, i_jpj ) |
---|
[2046] | 125 | #else |
---|
| 126 | i_jpj = MIN( jpj, i_jpj+1 ) |
---|
| 127 | IF(ln_ctl) WRITE(numout,*) 'lim_dyn : SH i_j1 = ', i_j1, ' ij_jpj = ', i_jpj |
---|
| 128 | CALL lim_rhg( i_j1, i_jpj ) !!!!cbr CALL lim_rhg( i_j1, i_jpj, kt ) |
---|
| 129 | #endif |
---|
[888] | 130 | ! |
---|
[2095] | 131 | ELSE ! local domain extends over one hemisphere only: rheology is |
---|
| 132 | ! ! computed only over the ice cover latitude strip |
---|
[76] | 133 | i_j1 = 1 |
---|
| 134 | DO WHILE ( i_j1 <= jpj .AND. zind(i_j1) == FLOAT(jpi) .AND. zmsk(i_j1) /=0 ) |
---|
| 135 | i_j1 = i_j1 + 1 |
---|
| 136 | END DO |
---|
| 137 | i_j1 = MAX( 1, i_j1-1 ) |
---|
| 138 | i_jpj = jpj |
---|
| 139 | DO WHILE ( i_jpj >= 1 .AND. zind(i_jpj) == FLOAT(jpi) .AND. zmsk(i_jpj) /=0 ) |
---|
| 140 | i_jpj = i_jpj - 1 |
---|
| 141 | END DO |
---|
[2095] | 142 | IF(ln_ctl) WRITE(numout,*) 'lim_dyn : one hemisphere: i_j1 = ', i_j1, ' ij_jpj = ', i_jpj |
---|
[2046] | 143 | #if defined key_lim2_vp |
---|
[76] | 144 | i_jpj = MIN( jpj, i_jpj+2) |
---|
[2095] | 145 | CALL lim_rhg_2( i_j1, i_jpj ) ! VP rheology |
---|
[2046] | 146 | #else |
---|
| 147 | i_j1 = MAX( 1, i_j1-2 ) |
---|
| 148 | i_jpj = MIN( jpj, i_jpj+1) |
---|
[2095] | 149 | CALL lim_rhg ( i_j1, i_jpj ) ! EVP rheology |
---|
[2046] | 150 | #endif |
---|
[888] | 151 | ! |
---|
[76] | 152 | ENDIF |
---|
[888] | 153 | ! |
---|
[76] | 154 | ENDIF |
---|
[2095] | 155 | ! |
---|
[1470] | 156 | IF(ln_ctl) CALL prt_ctl(tab2d_1=u_ice , clinfo1=' lim_dyn : u_ice :', tab2d_2=v_ice , clinfo2=' v_ice :') |
---|
[2095] | 157 | ! |
---|
[3] | 158 | |
---|
[2095] | 159 | ! ! friction velocity |
---|
| 160 | ! ! ================= |
---|
| 161 | SELECT CASE( cl_grid ) |
---|
| 162 | CASE( 'C' ) ! C-grid ice dynamics (EVP) |
---|
| 163 | zu_io(:,:) = u_ice(:,:) - ssu_m(:,:) ! ice-ocean & ice velocity at ocean velocity points |
---|
| 164 | zv_io(:,:) = v_ice(:,:) - ssv_m(:,:) |
---|
| 165 | ! |
---|
| 166 | CASE( 'B' ) ! B-grid ice dynamics (VP) |
---|
| 167 | DO jj = 1, jpjm1 ! ice velocity at I-point, ice-ocean velocity at ocean points |
---|
| 168 | DO ji = 1, jpim1 ! NO vector opt. |
---|
| 169 | zu_io(ji,jj) = 0.5 * ( u_ice(ji+1,jj+1) + u_ice(ji+1,jj ) ) - ssu_m(ji,jj) |
---|
| 170 | zv_io(ji,jj) = 0.5 * ( v_ice(ji+1,jj+1) + v_ice(ji ,jj+1) ) - ssv_m(ji,jj) |
---|
| 171 | END DO |
---|
[3] | 172 | END DO |
---|
[2095] | 173 | END SELECT |
---|
| 174 | ! |
---|
| 175 | DO jj = 2, jpjm1 ! frictional velocity at T-point |
---|
[1694] | 176 | DO ji = 2, jpim1 ! NO vector opt. because of zu_io |
---|
[888] | 177 | ust2s(ji,jj) = 0.5 * cw & |
---|
| 178 | & * ( zu_io(ji,jj) * zu_io(ji,jj) + zu_io(ji-1,jj) * zu_io(ji-1,jj) & |
---|
| 179 | & + zv_io(ji,jj) * zv_io(ji,jj) + zv_io(ji,jj-1) * zv_io(ji,jj-1) ) * tms(ji,jj) |
---|
[3] | 180 | END DO |
---|
| 181 | END DO |
---|
[888] | 182 | ! |
---|
[2095] | 183 | ELSE ! no ice dynamics : transmit directly the atmospheric stress to the ocean |
---|
| 184 | ! ! =============== |
---|
[888] | 185 | zcoef = SQRT( 0.5 ) / rau0 |
---|
| 186 | DO jj = 2, jpjm1 |
---|
| 187 | DO ji = fs_2, fs_jpim1 ! vector opt. |
---|
| 188 | ust2s(ji,jj) = zcoef * tms(ji,jj) * SQRT( utau(ji,jj) * utau(ji,jj) + utau(ji-1,jj) * utau(ji-1,jj) & |
---|
| 189 | & + vtau(ji,jj) * vtau(ji,jj) + vtau(ji,jj-1) * vtau(ji,jj-1) ) |
---|
[3] | 190 | END DO |
---|
| 191 | END DO |
---|
[888] | 192 | ! |
---|
[3] | 193 | ENDIF |
---|
[888] | 194 | ! |
---|
[2095] | 195 | CALL lbc_lnk( ust2s, 'T', 1. ) ! lateral boundary condition |
---|
[888] | 196 | ! |
---|
| 197 | IF(ln_ctl) CALL prt_ctl(tab2d_1=ust2s , clinfo1=' lim_dyn : ust2s :') |
---|
[2095] | 198 | ! |
---|
[821] | 199 | END SUBROUTINE lim_dyn_2 |
---|
[3] | 200 | |
---|
[76] | 201 | |
---|
[821] | 202 | SUBROUTINE lim_dyn_init_2 |
---|
[3] | 203 | !!------------------------------------------------------------------- |
---|
[821] | 204 | !! *** ROUTINE lim_dyn_init_2 *** |
---|
[3] | 205 | !! |
---|
[2095] | 206 | !! ** Purpose : initialisation of the ice dynamics variables |
---|
| 207 | !! |
---|
| 208 | !! ** Method : Read the namicedyn namelist and check their values |
---|
[3] | 209 | !! |
---|
| 210 | !! ** input : Namelist namicedyn |
---|
| 211 | !!------------------------------------------------------------------- |
---|
[2095] | 212 | NAMELIST/namicedyn/ epsd, alpha, dm, nbiter, nbitdr, om, resl, cw, angvg, pstar, & |
---|
| 213 | & c_rhg, etamn, creepl, ecc, ahi0, nevp, telast, alphaevp |
---|
[3] | 214 | !!------------------------------------------------------------------- |
---|
[2095] | 215 | ! |
---|
[888] | 216 | REWIND ( numnam_ice ) ! Read Namelist namicedyn |
---|
| 217 | READ ( numnam_ice , namicedyn ) |
---|
[2095] | 218 | ! |
---|
[888] | 219 | IF(lwp) THEN ! Control print |
---|
[3] | 220 | WRITE(numout,*) |
---|
[821] | 221 | WRITE(numout,*) 'lim_dyn_init_2: ice parameters for ice dynamics ' |
---|
| 222 | WRITE(numout,*) '~~~~~~~~~~~~~~' |
---|
[76] | 223 | WRITE(numout,*) ' tolerance parameter epsd = ', epsd |
---|
| 224 | WRITE(numout,*) ' coefficient for semi-implicit coriolis alpha = ', alpha |
---|
| 225 | WRITE(numout,*) ' diffusion constant for dynamics dm = ', dm |
---|
| 226 | WRITE(numout,*) ' number of sub-time steps for relaxation nbiter = ', nbiter |
---|
| 227 | WRITE(numout,*) ' maximum number of iterations for relaxation nbitdr = ', nbitdr |
---|
| 228 | WRITE(numout,*) ' relaxation constant om = ', om |
---|
| 229 | WRITE(numout,*) ' maximum value for the residual of relaxation resl = ', resl |
---|
| 230 | WRITE(numout,*) ' drag coefficient for oceanic stress cw = ', cw |
---|
[888] | 231 | WRITE(numout,*) ' turning angle for oceanic stress angvg = ', angvg, ' degrees' |
---|
[76] | 232 | WRITE(numout,*) ' first bulk-rheology parameter pstar = ', pstar |
---|
| 233 | WRITE(numout,*) ' second bulk-rhelogy parameter c_rhg = ', c_rhg |
---|
| 234 | WRITE(numout,*) ' minimun value for viscosity etamn = ', etamn |
---|
| 235 | WRITE(numout,*) ' creep limit creepl = ', creepl |
---|
| 236 | WRITE(numout,*) ' eccentricity of the elliptical yield curve ecc = ', ecc |
---|
| 237 | WRITE(numout,*) ' horizontal diffusivity coeff. for sea-ice ahi0 = ', ahi0 |
---|
[2046] | 238 | WRITE(numout,*) ' number of iterations for subcycling nevp = ', nevp |
---|
| 239 | WRITE(numout,*) ' timescale for elastic waves telast = ', telast |
---|
| 240 | WRITE(numout,*) ' coefficient for the solution of int. stresses alphaevp = ', alphaevp |
---|
[3] | 241 | ENDIF |
---|
[2095] | 242 | ! |
---|
[719] | 243 | ! Initialization |
---|
[3] | 244 | usecc2 = 1.0 / ( ecc * ecc ) |
---|
| 245 | rhoco = rau0 * cw |
---|
[888] | 246 | angvg = angvg * rad ! convert angvg from degree to radian |
---|
[3] | 247 | sangvg = SIN( angvg ) |
---|
| 248 | cangvg = COS( angvg ) |
---|
| 249 | pstarh = pstar / 2.0 |
---|
[888] | 250 | ! |
---|
| 251 | ahiu(:,:) = ahi0 * umask(:,:,1) ! Ice eddy Diffusivity coefficients. |
---|
[3] | 252 | ahiv(:,:) = ahi0 * vmask(:,:,1) |
---|
[888] | 253 | ! |
---|
[821] | 254 | END SUBROUTINE lim_dyn_init_2 |
---|
[3] | 255 | |
---|
| 256 | #else |
---|
| 257 | !!---------------------------------------------------------------------- |
---|
[2095] | 258 | !! Default option Dummy module NO LIM 2.0 sea-ice model |
---|
[3] | 259 | !!---------------------------------------------------------------------- |
---|
| 260 | CONTAINS |
---|
[2095] | 261 | SUBROUTINE lim_dyn_2 ! Dummy routine |
---|
[821] | 262 | END SUBROUTINE lim_dyn_2 |
---|
[3] | 263 | #endif |
---|
| 264 | |
---|
| 265 | !!====================================================================== |
---|
[821] | 266 | END MODULE limdyn_2 |
---|