[3] | 1 | MODULE limhdf |
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| 2 | !!====================================================================== |
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| 3 | !! *** MODULE limhdf *** |
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[88] | 4 | !! LIM ice model : horizontal diffusion of sea-ice quantities |
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[3] | 5 | !!====================================================================== |
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[88] | 6 | #if defined key_ice_lim |
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[3] | 7 | !!---------------------------------------------------------------------- |
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[88] | 8 | !! 'key_ice_lim' LIM sea-ice model |
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| 9 | !!---------------------------------------------------------------------- |
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[3] | 10 | !! lim_hdf : diffusion trend on sea-ice variable |
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| 11 | !!---------------------------------------------------------------------- |
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| 12 | !! * Modules used |
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| 13 | USE dom_oce |
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| 14 | USE ice_oce ! ice variables |
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| 15 | USE in_out_manager |
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| 16 | USE ice |
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| 17 | ! USE limdyn |
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| 18 | USE lbclnk |
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[12] | 19 | USE lib_mpp |
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[3] | 20 | |
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| 21 | IMPLICIT NONE |
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| 22 | PRIVATE |
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| 23 | |
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| 24 | !! * Routine accessibility |
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| 25 | PUBLIC lim_hdf ! called by lim_tra |
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| 26 | |
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| 27 | !! * Module variables |
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| 28 | LOGICAL :: linit = .TRUE. ! ??? |
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| 29 | REAL(wp) :: epsi04 = 1e-04 ! constant |
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| 30 | REAL(wp), DIMENSION(jpi,jpj) :: zfact ! ??? |
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| 31 | |
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| 32 | !! * Substitution |
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| 33 | # include "vectopt_loop_substitute.h90" |
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| 34 | !!---------------------------------------------------------------------- |
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[247] | 35 | !! LIM 2.0, UCL-LOCEAN-IPSL (2005) |
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| 36 | !! $Header$ |
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| 37 | !! This software is governed by the CeCILL licence see modipsl/doc/NEMO_CeCILL.txt |
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[3] | 38 | !!---------------------------------------------------------------------- |
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| 39 | |
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| 40 | CONTAINS |
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| 41 | |
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| 42 | SUBROUTINE lim_hdf( ptab ) |
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| 43 | !!------------------------------------------------------------------- |
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| 44 | !! *** ROUTINE lim_hdf *** |
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| 45 | !! |
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| 46 | !! ** purpose : Compute and add the diffusive trend on sea-ice |
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| 47 | !! variables |
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| 48 | !! |
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| 49 | !! ** method : Second order diffusive operator evaluated using a |
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| 50 | !! Cranck-Nicholson time Scheme. |
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| 51 | !! |
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| 52 | !! ** Action : update ptab with the diffusive contribution |
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| 53 | !! |
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| 54 | !! History : |
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| 55 | !! ! 00-01 (LIM) Original code |
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| 56 | !! ! 01-05 (G. Madec, R. Hordoir) opa norm |
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| 57 | !! ! 02-08 (C. Ethe) F90, free form |
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| 58 | !!------------------------------------------------------------------- |
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| 59 | ! * Arguments |
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| 60 | REAL(wp), DIMENSION(jpi,jpj), INTENT( inout ) :: & |
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| 61 | ptab ! Field on which the diffusion is applied |
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| 62 | REAL(wp), DIMENSION(jpi,jpj) :: & |
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| 63 | ptab0 ! ??? |
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| 64 | |
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| 65 | ! * Local variables |
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| 66 | INTEGER :: ji, jj ! dummy loop indices |
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| 67 | INTEGER :: & |
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| 68 | its, iter ! temporary integers |
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| 69 | REAL(wp) :: & |
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| 70 | zalfa, zrlxint, zconv, zeps ! temporary scalars |
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| 71 | REAL(wp), DIMENSION(jpi,jpj) :: & |
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| 72 | zrlx, zflu, zflv, & ! temporary workspaces |
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| 73 | zdiv0, zdiv ! " " |
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| 74 | !!------------------------------------------------------------------- |
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| 75 | |
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| 76 | ! Initialisation |
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| 77 | ! --------------- |
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| 78 | ! Time integration parameters |
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| 79 | zalfa = 0.5 ! =1.0/0.5/0.0 = implicit/Cranck-Nicholson/explicit |
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| 80 | its = 100 ! Maximum number of iteration |
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| 81 | zeps = 2. * epsi04 |
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| 82 | |
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| 83 | ! Arrays initialization |
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| 84 | ptab0 (:, : ) = ptab(:,:) |
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| 85 | !bug zflu (:,jpj) = 0.e0 |
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| 86 | !bug zflv (:,jpj) = 0.e0 |
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| 87 | zdiv0(:, 1 ) = 0.e0 |
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| 88 | zdiv0(:,jpj) = 0.e0 |
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[12] | 89 | IF( .NOT.lk_vopt_loop ) THEN |
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| 90 | zflu (jpi,:) = 0.e0 |
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| 91 | zflv (jpi,:) = 0.e0 |
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| 92 | zdiv0(1, :) = 0.e0 |
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| 93 | zdiv0(jpi,:) = 0.e0 |
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| 94 | ENDIF |
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[3] | 95 | |
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| 96 | ! Metric coefficient (compute at the first call and saved in |
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| 97 | IF( linit ) THEN |
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| 98 | DO jj = 2, jpjm1 |
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| 99 | DO ji = fs_2 , fs_jpim1 ! vector opt. |
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| 100 | zfact(ji,jj) = ( e2u(ji,jj) + e2u(ji-1,jj ) + e1v(ji,jj) + e1v(ji,jj-1) ) & |
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[88] | 101 | & / ( e1t(ji,jj) * e2t(ji,jj) ) |
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[3] | 102 | END DO |
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| 103 | END DO |
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| 104 | linit = .FALSE. |
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| 105 | ENDIF |
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| 106 | |
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| 107 | |
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| 108 | ! Sub-time step loop |
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| 109 | zconv = 1.e0 |
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| 110 | iter = 0 |
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| 111 | |
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| 112 | ! !=================== |
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| 113 | DO WHILE ( ( zconv > zeps ) .AND. (iter <= its) ) ! Sub-time step loop |
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| 114 | ! !=================== |
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| 115 | ! incrementation of the sub-time step number |
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| 116 | iter = iter + 1 |
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| 117 | |
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| 118 | ! diffusive fluxes in U- and V- direction |
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| 119 | DO jj = 1, jpjm1 |
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| 120 | DO ji = 1 , fs_jpim1 ! vector opt. |
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| 121 | zflu(ji,jj) = pahu(ji,jj) * e2u(ji,jj) / e1u(ji,jj) * ( ptab(ji+1,jj) - ptab(ji,jj) ) |
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| 122 | zflv(ji,jj) = pahv(ji,jj) * e1v(ji,jj) / e2v(ji,jj) * ( ptab(ji,jj+1) - ptab(ji,jj) ) |
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| 123 | END DO |
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| 124 | END DO |
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| 125 | |
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| 126 | ! diffusive trend : divergence of the fluxes |
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| 127 | DO jj= 2, jpjm1 |
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| 128 | DO ji = fs_2 , fs_jpim1 ! vector opt. |
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| 129 | zdiv (ji,jj) = ( zflu(ji,jj) - zflu(ji-1,jj ) & |
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| 130 | & + zflv(ji,jj) - zflv(ji ,jj-1) ) / ( e1t (ji,jj) * e2t (ji,jj) ) |
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| 131 | END DO |
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| 132 | END DO |
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| 133 | |
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| 134 | ! save the first evaluation of the diffusive trend in zdiv0 |
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| 135 | IF( iter == 1 ) zdiv0(:,:) = zdiv(:,:) |
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| 136 | |
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| 137 | ! XXXX iterative evaluation????? |
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| 138 | DO jj = 2, jpjm1 |
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| 139 | DO ji = fs_2 , fs_jpim1 ! vector opt. |
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| 140 | zrlxint = ( ptab0(ji,jj) & |
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| 141 | & + rdt_ice * ( zalfa * ( zdiv(ji,jj) + zfact(ji,jj) * ptab(ji,jj) ) & |
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| 142 | & + ( 1.0 - zalfa ) * zdiv0(ji,jj) ) ) & |
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| 143 | & / ( 1.0 + zalfa * rdt_ice * zfact(ji,jj) ) |
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| 144 | zrlx(ji,jj) = ptab(ji,jj) + om * ( zrlxint - ptab(ji,jj) ) |
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| 145 | END DO |
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| 146 | END DO |
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| 147 | |
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| 148 | ! convergence test |
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[88] | 149 | zconv = 0.e0 |
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[3] | 150 | DO jj = 2, jpjm1 |
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| 151 | DO ji = 2, jpim1 |
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| 152 | zconv = MAX( zconv, ABS( zrlx(ji,jj) - ptab(ji,jj) ) ) |
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| 153 | END DO |
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| 154 | END DO |
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[12] | 155 | IF( lk_mpp ) CALL mpp_max( zconv ) ! max over the global domain |
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| 156 | |
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[3] | 157 | DO jj = 2, jpjm1 |
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| 158 | DO ji = 2 , jpim1 |
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| 159 | ptab(ji,jj) = zrlx(ji,jj) |
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| 160 | END DO |
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| 161 | END DO |
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| 162 | |
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| 163 | ! lateral boundary condition on ptab |
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| 164 | CALL lbc_lnk( ptab, 'T', 1. ) |
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| 165 | ! !========================== |
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| 166 | END DO ! end of sub-time step loop |
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| 167 | ! !========================== |
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| 168 | |
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| 169 | ptab(:,:) = ptab(:,:) |
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| 170 | |
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[106] | 171 | IF(l_ctl) WRITE(numout,*) ' lim_hdf : ', SUM( ptab(2:nictl,2:njctl)-ptab0(2:nictl,2:njctl) ), & |
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| 172 | & ' zconv= ', zconv, ' iter= ', iter |
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[88] | 173 | |
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[3] | 174 | END SUBROUTINE lim_hdf |
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[88] | 175 | |
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[3] | 176 | #else |
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[88] | 177 | !!---------------------------------------------------------------------- |
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| 178 | !! Default option Dummy module NO LIM sea-ice model |
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| 179 | !!---------------------------------------------------------------------- |
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[3] | 180 | CONTAINS |
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| 181 | SUBROUTINE lim_hdf ! Empty routine |
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| 182 | END SUBROUTINE lim_hdf |
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| 183 | #endif |
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| 184 | |
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| 185 | !!====================================================================== |
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| 186 | END MODULE limhdf |
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