[825] | 1 | MODULE limhdf |
---|
| 2 | !!====================================================================== |
---|
| 3 | !! *** MODULE limhdf *** |
---|
| 4 | !! LIM ice model : horizontal diffusion of sea-ice quantities |
---|
| 5 | !!====================================================================== |
---|
[2715] | 6 | !! History : LIM ! 2000-01 (LIM) Original code |
---|
| 7 | !! - ! 2001-05 (G. Madec, R. Hordoir) opa norm |
---|
| 8 | !! 1.0 ! 2002-08 (C. Ethe) F90, free form |
---|
| 9 | !!---------------------------------------------------------------------- |
---|
[825] | 10 | #if defined key_lim3 |
---|
| 11 | !!---------------------------------------------------------------------- |
---|
[834] | 12 | !! 'key_lim3' LIM3 sea-ice model |
---|
[825] | 13 | !!---------------------------------------------------------------------- |
---|
| 14 | !! lim_hdf : diffusion trend on sea-ice variable |
---|
| 15 | !!---------------------------------------------------------------------- |
---|
[2715] | 16 | USE dom_oce ! ocean domain |
---|
| 17 | USE ice ! LIM-3: ice variables |
---|
| 18 | USE lbclnk ! lateral boundary condition - MPP exchanges |
---|
| 19 | USE lib_mpp ! MPP library |
---|
[3294] | 20 | USE wrk_nemo ! work arrays |
---|
[2715] | 21 | USE prtctl ! Print control |
---|
| 22 | USE in_out_manager ! I/O manager |
---|
[825] | 23 | |
---|
| 24 | IMPLICIT NONE |
---|
| 25 | PRIVATE |
---|
| 26 | |
---|
[2715] | 27 | PUBLIC lim_hdf ! called by lim_tra |
---|
[825] | 28 | |
---|
[2715] | 29 | LOGICAL :: linit = .TRUE. ! initialization flag (set to flase after the 1st call) |
---|
[825] | 30 | REAL(wp) :: epsi04 = 1e-04 ! constant |
---|
[2715] | 31 | REAL(wp), ALLOCATABLE, SAVE, DIMENSION(:,:) :: efact ! metric coefficient |
---|
[825] | 32 | |
---|
| 33 | !! * Substitution |
---|
| 34 | # include "vectopt_loop_substitute.h90" |
---|
| 35 | !!---------------------------------------------------------------------- |
---|
[2715] | 36 | !! NEMO/LIM3 4.0 , UCL - NEMO Consortium (2010) |
---|
[1156] | 37 | !! $Id$ |
---|
[2715] | 38 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
---|
[825] | 39 | !!---------------------------------------------------------------------- |
---|
| 40 | CONTAINS |
---|
| 41 | |
---|
| 42 | SUBROUTINE lim_hdf( ptab ) |
---|
| 43 | !!------------------------------------------------------------------- |
---|
| 44 | !! *** ROUTINE lim_hdf *** |
---|
| 45 | !! |
---|
[2715] | 46 | !! ** purpose : Compute and add the diffusive trend on sea-ice variables |
---|
[825] | 47 | !! |
---|
| 48 | !! ** method : Second order diffusive operator evaluated using a |
---|
[2715] | 49 | !! Cranck-Nicholson time Scheme. |
---|
[825] | 50 | !! |
---|
| 51 | !! ** Action : update ptab with the diffusive contribution |
---|
| 52 | !!------------------------------------------------------------------- |
---|
[2715] | 53 | REAL(wp), DIMENSION(jpi,jpj), INTENT( inout ) :: ptab ! Field on which the diffusion is applied |
---|
| 54 | ! |
---|
| 55 | INTEGER :: ji, jj ! dummy loop indices |
---|
| 56 | INTEGER :: its, iter, ierr ! local integers |
---|
| 57 | REAL(wp) :: zalfa, zrlxint, zconv, zeps ! local scalars |
---|
[3294] | 58 | REAL(wp), POINTER, DIMENSION(:,:) :: zrlx, zflu, zflv, zdiv0, zdiv, ztab0 |
---|
[2715] | 59 | CHARACTER(lc) :: charout ! local character |
---|
[825] | 60 | !!------------------------------------------------------------------- |
---|
[2715] | 61 | |
---|
[3294] | 62 | CALL wrk_alloc( jpi, jpj, zrlx, zflu, zflv, zdiv0, zdiv, ztab0 ) |
---|
[825] | 63 | |
---|
[2715] | 64 | ! !== Initialisation ==! |
---|
| 65 | ! |
---|
| 66 | IF( linit ) THEN ! Metric coefficient (compute at the first call and saved in efact) |
---|
| 67 | ALLOCATE( efact(jpi,jpj) , STAT=ierr ) |
---|
| 68 | IF( lk_mpp ) CALL mpp_sum( ierr ) |
---|
| 69 | IF( ierr /= 0 ) CALL ctl_stop( 'STOP', 'lim_hdf : unable to allocate arrays' ) |
---|
[825] | 70 | DO jj = 2, jpjm1 |
---|
| 71 | DO ji = fs_2 , fs_jpim1 ! vector opt. |
---|
[2715] | 72 | efact(ji,jj) = ( e2u(ji,jj) + e2u(ji-1,jj) + e1v(ji,jj) + e1v(ji,jj-1) ) / ( e1t(ji,jj) * e2t(ji,jj) ) |
---|
[825] | 73 | END DO |
---|
| 74 | END DO |
---|
| 75 | linit = .FALSE. |
---|
| 76 | ENDIF |
---|
[2715] | 77 | ! ! Time integration parameters |
---|
| 78 | zalfa = 0.5_wp ! =1.0/0.5/0.0 = implicit/Cranck-Nicholson/explicit |
---|
| 79 | its = 100 ! Maximum number of iteration |
---|
| 80 | zeps = 2._wp * epsi04 |
---|
| 81 | ! |
---|
| 82 | ztab0(:, : ) = ptab(:,:) ! Arrays initialization |
---|
| 83 | zdiv0(:, 1 ) = 0._wp |
---|
| 84 | zdiv0(:,jpj) = 0._wp |
---|
| 85 | IF( .NOT.lk_vopt_loop ) THEN |
---|
| 86 | zflu (jpi,:) = 0._wp |
---|
| 87 | zflv (jpi,:) = 0._wp |
---|
| 88 | zdiv0(1, :) = 0._wp |
---|
| 89 | zdiv0(jpi,:) = 0._wp |
---|
| 90 | ENDIF |
---|
[825] | 91 | |
---|
[2715] | 92 | zconv = 1._wp !== horizontal diffusion using a Crant-Nicholson scheme ==! |
---|
[825] | 93 | iter = 0 |
---|
[2715] | 94 | ! |
---|
| 95 | DO WHILE( zconv > zeps .AND. iter <= its ) ! Sub-time step loop |
---|
| 96 | ! |
---|
| 97 | iter = iter + 1 ! incrementation of the sub-time step number |
---|
| 98 | ! |
---|
| 99 | DO jj = 1, jpjm1 ! diffusive fluxes in U- and V- direction |
---|
[825] | 100 | DO ji = 1 , fs_jpim1 ! vector opt. |
---|
| 101 | zflu(ji,jj) = pahu(ji,jj) * e2u(ji,jj) / e1u(ji,jj) * ( ptab(ji+1,jj) - ptab(ji,jj) ) |
---|
| 102 | zflv(ji,jj) = pahv(ji,jj) * e1v(ji,jj) / e2v(ji,jj) * ( ptab(ji,jj+1) - ptab(ji,jj) ) |
---|
| 103 | END DO |
---|
| 104 | END DO |
---|
[2715] | 105 | ! |
---|
| 106 | DO jj= 2, jpjm1 ! diffusive trend : divergence of the fluxes |
---|
[825] | 107 | DO ji = fs_2 , fs_jpim1 ! vector opt. |
---|
| 108 | zdiv (ji,jj) = ( zflu(ji,jj) - zflu(ji-1,jj ) & |
---|
| 109 | & + zflv(ji,jj) - zflv(ji ,jj-1) ) / ( e1t (ji,jj) * e2t (ji,jj) ) |
---|
| 110 | END DO |
---|
| 111 | END DO |
---|
[2715] | 112 | ! |
---|
| 113 | IF( iter == 1 ) zdiv0(:,:) = zdiv(:,:) ! save the 1st evaluation of the diffusive trend in zdiv0 |
---|
| 114 | ! |
---|
| 115 | DO jj = 2, jpjm1 ! iterative evaluation |
---|
[825] | 116 | DO ji = fs_2 , fs_jpim1 ! vector opt. |
---|
[2715] | 117 | zrlxint = ( ztab0(ji,jj) & |
---|
| 118 | & + rdt_ice * ( zalfa * ( zdiv(ji,jj) + efact(ji,jj) * ptab(ji,jj) ) & |
---|
[825] | 119 | & + ( 1.0 - zalfa ) * zdiv0(ji,jj) ) ) & |
---|
[2715] | 120 | & / ( 1.0 + zalfa * rdt_ice * efact(ji,jj) ) |
---|
[825] | 121 | zrlx(ji,jj) = ptab(ji,jj) + om * ( zrlxint - ptab(ji,jj) ) |
---|
| 122 | END DO |
---|
| 123 | END DO |
---|
[2715] | 124 | CALL lbc_lnk( zrlx, 'T', 1. ) ! lateral boundary condition |
---|
| 125 | ! |
---|
| 126 | zconv = 0._wp ! convergence test |
---|
[825] | 127 | DO jj = 2, jpjm1 |
---|
[868] | 128 | DO ji = fs_2, fs_jpim1 |
---|
[825] | 129 | zconv = MAX( zconv, ABS( zrlx(ji,jj) - ptab(ji,jj) ) ) |
---|
| 130 | END DO |
---|
| 131 | END DO |
---|
[2715] | 132 | IF( lk_mpp ) CALL mpp_max( zconv ) ! max over the global domain |
---|
| 133 | ! |
---|
| 134 | ptab(:,:) = zrlx(:,:) |
---|
| 135 | ! |
---|
[825] | 136 | END DO ! end of sub-time step loop |
---|
| 137 | |
---|
| 138 | IF(ln_ctl) THEN |
---|
[2715] | 139 | zrlx(:,:) = ptab(:,:) - ztab0(:,:) |
---|
[825] | 140 | WRITE(charout,FMT="(' lim_hdf : zconv =',D23.16, ' iter =',I4,2X)") zconv, iter |
---|
[2715] | 141 | CALL prt_ctl( tab2d_1=zrlx, clinfo1=charout ) |
---|
[825] | 142 | ENDIF |
---|
[2715] | 143 | ! |
---|
[3294] | 144 | CALL wrk_dealloc( jpi, jpj, zrlx, zflu, zflv, zdiv0, zdiv, ztab0 ) |
---|
[2715] | 145 | ! |
---|
[825] | 146 | END SUBROUTINE lim_hdf |
---|
| 147 | |
---|
| 148 | #else |
---|
| 149 | !!---------------------------------------------------------------------- |
---|
| 150 | !! Default option Dummy module NO LIM sea-ice model |
---|
| 151 | !!---------------------------------------------------------------------- |
---|
| 152 | CONTAINS |
---|
| 153 | SUBROUTINE lim_hdf ! Empty routine |
---|
| 154 | END SUBROUTINE lim_hdf |
---|
| 155 | #endif |
---|
| 156 | |
---|
| 157 | !!====================================================================== |
---|
| 158 | END MODULE limhdf |
---|