[3] | 1 | MODULE trazdf_exp |
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| 2 | !!============================================================================== |
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| 3 | !! *** MODULE trazdf_exp *** |
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[2528] | 4 | !! Ocean tracers: vertical component of the tracer mixing trend using |
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| 5 | !! a split-explicit time-stepping |
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[3] | 6 | !!============================================================================== |
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[1110] | 7 | !! History : OPA ! 1990-10 (B. Blanke) Original code |
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| 8 | !! 7.0 ! 1991-11 (G. Madec) |
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| 9 | !! ! 1992-06 (M. Imbard) correction on tracer trend loops |
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| 10 | !! ! 1996-01 (G. Madec) statement function for e3 |
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| 11 | !! ! 1997-05 (G. Madec) vertical component of isopycnal |
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| 12 | !! ! 1997-07 (G. Madec) geopotential diffusion in s-coord |
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| 13 | !! ! 2000-08 (G. Madec) double diffusive mixing |
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| 14 | !! NEMO 1.0 ! 2002-08 (G. Madec) F90: Free form and module |
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| 15 | !! - ! 2004-08 (C. Talandier) New trends organisation |
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| 16 | !! - ! 2005-11 (G. Madec) New organisation |
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| 17 | !! 3.0 ! 2008-04 (G. Madec) leap-frog time stepping done in trazdf |
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[2528] | 18 | !! 3.3 ! 2010-06 (C. Ethe, G. Madec) Merge TRA-TRC |
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[3] | 19 | !!---------------------------------------------------------------------- |
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[1110] | 20 | |
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[3] | 21 | !!---------------------------------------------------------------------- |
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[6140] | 22 | !! tra_zdf_exp : compute the tracer the vertical diffusion trend using a |
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| 23 | !! split-explicit time stepping and provide the after tracer |
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[1110] | 24 | !!---------------------------------------------------------------------- |
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[6140] | 25 | USE oce ! ocean dynamics and active tracers |
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| 26 | USE dom_oce ! ocean space and time domain |
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| 27 | USE domvvl ! variable volume levels |
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| 28 | USE zdf_oce ! ocean vertical physics |
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| 29 | USE zdfddm ! ocean vertical physics: double diffusion |
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| 30 | USE trc_oce ! share passive tracers/Ocean variables |
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| 31 | ! |
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| 32 | USE in_out_manager ! I/O manager |
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| 33 | USE lib_mpp ! MPP library |
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| 34 | USE wrk_nemo ! Memory Allocation |
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| 35 | USE timing ! Timing |
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[3] | 36 | |
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| 37 | IMPLICIT NONE |
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| 38 | PRIVATE |
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| 39 | |
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[1110] | 40 | PUBLIC tra_zdf_exp ! routine called by step.F90 |
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[3] | 41 | |
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| 42 | !! * Substitutions |
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| 43 | # include "zdfddm_substitute.h90" |
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[1110] | 44 | # include "vectopt_loop_substitute.h90" |
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[3] | 45 | !!---------------------------------------------------------------------- |
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[2528] | 46 | !! NEMO/OPA 3.3 , NEMO Consortium (2010) |
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| 47 | !! $Id$ |
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[2715] | 48 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
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[3] | 49 | !!---------------------------------------------------------------------- |
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| 50 | CONTAINS |
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| 51 | |
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[6140] | 52 | SUBROUTINE tra_zdf_exp( kt, kit000, cdtype, p2dt, ksts, & |
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| 53 | & ptb , pta , kjpt ) |
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[3] | 54 | !!---------------------------------------------------------------------- |
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| 55 | !! *** ROUTINE tra_zdf_exp *** |
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| 56 | !! |
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[1110] | 57 | !! ** Purpose : Compute the after tracer fields due to the vertical |
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| 58 | !! tracer mixing alone, and then due to the whole tracer trend. |
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[3] | 59 | !! |
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[1110] | 60 | !! ** Method : - The after tracer fields due to the vertical diffusion |
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| 61 | !! of tracers alone is given by: |
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[6140] | 62 | !! ztb = ptb + p2dt difft |
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[2528] | 63 | !! where difft = dz( avt dz(ptb) ) = 1/e3t dk+1( avt/e3w dk(ptb) ) |
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| 64 | !! (if lk_zdfddm=T use avs on salinity and passive tracers instead of avt) |
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[1110] | 65 | !! difft is evaluated with an Euler split-explit scheme using a |
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| 66 | !! no flux boundary condition at both surface and bottomi boundaries. |
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| 67 | !! (N.B. bottom condition is applied through the masked field avt). |
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| 68 | !! - the after tracer fields due to the whole trend is |
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[6140] | 69 | !! obtained in leap-frog environment applied on thickness weighted tracer by : |
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| 70 | !! pta = [ ptb*e3tb + e3tn*( ztb - ptb + p2dt pta ) ] / e3tn |
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[3] | 71 | !! |
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[2528] | 72 | !! ** Action : - after tracer fields pta |
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[1110] | 73 | !!--------------------------------------------------------------------- |
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[6140] | 74 | INTEGER , INTENT(in ) :: kt ! ocean time-step index |
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| 75 | INTEGER , INTENT(in ) :: kit000 ! first time step index |
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| 76 | CHARACTER(len=3) , INTENT(in ) :: cdtype ! =TRA or TRC (tracer indicator) |
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| 77 | INTEGER , INTENT(in ) :: kjpt ! number of tracers |
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| 78 | INTEGER , INTENT(in ) :: ksts ! number of sub-time step |
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| 79 | REAL(wp) , INTENT(in ) :: p2dt ! vertical profile of tracer time-step |
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| 80 | REAL(wp), DIMENSION(jpi,jpj,jpk,kjpt), INTENT(in ) :: ptb ! before and now tracer fields |
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| 81 | REAL(wp), DIMENSION(jpi,jpj,jpk,kjpt), INTENT(inout) :: pta ! in: tracer trend ; out: after tracer field |
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[2715] | 82 | ! |
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[6140] | 83 | INTEGER :: ji, jj, jk, jn, jl ! dummy loop indices |
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| 84 | REAL(wp) :: z1_ksts, ze3tr ! local scalars |
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| 85 | REAL(wp) :: ztra, ze3tb ! - - |
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| 86 | REAL(wp), POINTER, DIMENSION(:,:,:) :: ztb, zwf |
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[3] | 87 | !!--------------------------------------------------------------------- |
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[3294] | 88 | ! |
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| 89 | IF( nn_timing == 1 ) CALL timing_start('tra_zdf_exp') |
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| 90 | ! |
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[6140] | 91 | CALL wrk_alloc( jpi,jpj,jpk, ztb, zwf ) |
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[3294] | 92 | ! |
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| 93 | IF( kt == kit000 ) THEN |
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[457] | 94 | IF(lwp) WRITE(numout,*) |
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[2528] | 95 | IF(lwp) WRITE(numout,*) 'tra_zdf_exp : explicit vertical mixing on ', cdtype |
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[457] | 96 | IF(lwp) WRITE(numout,*) '~~~~~~~~~~~' |
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| 97 | ENDIF |
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[3] | 98 | |
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[1110] | 99 | ! Initializations |
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| 100 | ! --------------- |
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[6140] | 101 | z1_ksts = 1._wp / REAL( ksts, wp ) |
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| 102 | zwf(:,:, 1 ) = 0._wp ! no flux at the surface and at bottom level |
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| 103 | zwf(:,:,jpk) = 0._wp |
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[1110] | 104 | ! |
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| 105 | ! |
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[6140] | 106 | DO jn = 1, kjpt !== loop over tracers ==! |
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[2528] | 107 | ! |
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[6140] | 108 | ztb(:,:,:) = ptb(:,:,:,jn) ! initial before value for tracer |
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| 109 | ! |
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| 110 | DO jl = 1, ksts !== Split-explicit loop ==! |
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| 111 | ! |
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| 112 | DO jk = 2, jpk ! 1st vertical derivative (w-flux) |
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[2528] | 113 | DO jj = 2, jpjm1 |
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| 114 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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| 115 | IF( cdtype == 'TRA' .AND. jn == jp_tem ) THEN ! temperature : use of avt |
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[6140] | 116 | zwf(ji,jj,jk) = avt(ji,jj,jk) * ( ztb(ji,jj,jk-1) - ztb(ji,jj,jk) ) / e3w_b(ji,jj,jk) |
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[2528] | 117 | ELSE ! salinity or pass. tracer : use of avs |
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[6140] | 118 | zwf(ji,jj,jk) = fsavs(ji,jj,jk) * ( ztb(ji,jj,jk-1) - ztb(ji,jj,jk) ) / e3w_b(ji,jj,jk) |
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[2528] | 119 | END IF |
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| 120 | END DO |
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[1110] | 121 | END DO |
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| 122 | END DO |
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[2528] | 123 | ! |
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[6140] | 124 | DO jk = 1, jpkm1 ! 2nd vertical derivative ==> tracer at kt+l*2*rdt/nn_zdfexp |
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[2528] | 125 | DO jj = 2, jpjm1 |
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| 126 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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[6140] | 127 | ztb(ji,jj,jk) = ztb(ji,jj,jk) + p2dt * ( zwf(ji,jj,jk) - zwf(ji,jj,jk+1) ) / e3t_n(ji,jj,jk) |
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[2528] | 128 | END DO |
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[1110] | 129 | END DO |
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[3] | 130 | END DO |
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[2528] | 131 | ! |
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[6140] | 132 | END DO ! end sub-time stepping |
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[3] | 133 | |
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[6140] | 134 | DO jk = 1, jpkm1 !== After tracer due to all trends |
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| 135 | DO jj = 2, jpjm1 |
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| 136 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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| 137 | ze3tb = e3t_b(ji,jj,jk) / e3t_n(ji,jj,jk) |
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| 138 | ztra = ( ztb(ji,jj,jk) - ptb(ji,jj,jk,jn) ) + p2dt * pta(ji,jj,jk,jn) ! total trend * 2dt |
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| 139 | pta(ji,jj,jk,jn) = ( ze3tb * ptb(ji,jj,jk,jn) + ztra ) * tmask(ji,jj,jk) ! after tracer |
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[3] | 140 | END DO |
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[1110] | 141 | END DO |
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[6140] | 142 | END DO |
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[2528] | 143 | ! |
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[6140] | 144 | END DO ! end of tracer loop |
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[1110] | 145 | ! |
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[6140] | 146 | CALL wrk_dealloc( jpi,jpj,jpk, ztb, zwf ) |
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[2715] | 147 | ! |
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[3294] | 148 | IF( nn_timing == 1 ) CALL timing_stop('tra_zdf_exp') |
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| 149 | ! |
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[3] | 150 | END SUBROUTINE tra_zdf_exp |
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| 151 | |
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| 152 | !!============================================================================== |
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| 153 | END MODULE trazdf_exp |
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