[3] | 1 | MODULE trazdf_imp |
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[1438] | 2 | !!====================================================================== |
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[457] | 3 | !! *** MODULE trazdf_imp *** |
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[2528] | 4 | !! Ocean tracers: vertical component of the tracer mixing trend |
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[1438] | 5 | !!====================================================================== |
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| 6 | !! History : OPA ! 1990-10 (B. Blanke) Original code |
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| 7 | !! 7.0 ! 1991-11 (G. Madec) |
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| 8 | !! ! 1992-06 (M. Imbard) correction on tracer trend loops |
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| 9 | !! ! 1996-01 (G. Madec) statement function for e3 |
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| 10 | !! ! 1997-05 (G. Madec) vertical component of isopycnal |
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| 11 | !! ! 1997-07 (G. Madec) geopotential diffusion in s-coord |
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| 12 | !! ! 2000-08 (G. Madec) double diffusive mixing |
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| 13 | !! NEMO 1.0 ! 2002-08 (G. Madec) F90: Free form and module |
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| 14 | !! 2.0 ! 2006-11 (G. Madec) New step reorganisation |
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| 15 | !! 3.2 ! 2009-03 (G. Madec) heat and salt content trends |
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[2528] | 16 | !! 3.3 ! 2010-06 (C. Ethe, G. Madec) Merge TRA-TRC |
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[2602] | 17 | !! - ! 2011-02 (A. Coward, C. Ethe, G. Madec) improvment of surface boundary condition |
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[6140] | 18 | !! 3.7 ! 2015-11 (G. Madec, A. Coward) non linear free surface by default |
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[3] | 19 | !!---------------------------------------------------------------------- |
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[1438] | 20 | |
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| 21 | !!---------------------------------------------------------------------- |
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[6140] | 22 | !! tra_zdf_imp : Update the tracer trend with vertical mixing, nad compute the after tracer field |
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[3] | 23 | !!---------------------------------------------------------------------- |
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[5836] | 24 | USE oce ! ocean dynamics and tracers variables |
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| 25 | USE dom_oce ! ocean space and time domain variables |
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| 26 | USE zdf_oce ! ocean vertical physics variables |
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| 27 | USE trc_oce ! share passive tracers/ocean variables |
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| 28 | USE domvvl ! variable volume |
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| 29 | USE ldftra ! lateral mixing type |
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| 30 | USE ldfslp ! lateral physics: slope of diffusion |
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| 31 | USE zdfddm ! ocean vertical physics: double diffusion |
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| 32 | USE traldf_triad ! active tracers: Method of Stabilizing Correction |
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| 33 | ! |
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| 34 | USE in_out_manager ! I/O manager |
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| 35 | USE lbclnk ! ocean lateral boundary conditions (or mpp link) |
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| 36 | USE lib_mpp ! MPP library |
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| 37 | USE wrk_nemo ! Memory Allocation |
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| 38 | USE timing ! Timing |
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[3] | 39 | |
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| 40 | IMPLICIT NONE |
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| 41 | PRIVATE |
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| 42 | |
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[1438] | 43 | PUBLIC tra_zdf_imp ! routine called by step.F90 |
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[3] | 44 | |
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| 45 | !! * Substitutions |
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| 46 | # include "zdfddm_substitute.h90" |
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[457] | 47 | # include "vectopt_loop_substitute.h90" |
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[3] | 48 | !!---------------------------------------------------------------------- |
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[5836] | 49 | !! NEMO/OPA 3.7 , NEMO Consortium (2015) |
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[1156] | 50 | !! $Id$ |
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[2528] | 51 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
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[457] | 52 | !!---------------------------------------------------------------------- |
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[3] | 53 | CONTAINS |
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[2528] | 54 | |
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[3294] | 55 | SUBROUTINE tra_zdf_imp( kt, kit000, cdtype, p2dt, ptb, pta, kjpt ) |
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[3] | 56 | !!---------------------------------------------------------------------- |
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| 57 | !! *** ROUTINE tra_zdf_imp *** |
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| 58 | !! |
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[2602] | 59 | !! ** Purpose : Compute the after tracer through a implicit computation |
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| 60 | !! of the vertical tracer diffusion (including the vertical component |
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| 61 | !! of lateral mixing (only for 2nd order operator, for fourth order |
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| 62 | !! it is already computed and add to the general trend in traldf) |
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[3] | 63 | !! |
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[6140] | 64 | !! ** Method : The vertical diffusion of a tracer ,t , is given by: |
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| 65 | !! difft = dz( avt dz(t) ) = 1/e3t dk+1( avt/e3w dk(t) ) |
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| 66 | !! It is computed using a backward time scheme (t=after field) |
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| 67 | !! which provide directly the after tracer field. |
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[2602] | 68 | !! If lk_zdfddm=T, use avs for salinity or for passive tracers |
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[3] | 69 | !! Surface and bottom boundary conditions: no diffusive flux on |
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| 70 | !! both tracers (bottom, applied through the masked field avt). |
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[2602] | 71 | !! If iso-neutral mixing, add to avt the contribution due to lateral mixing. |
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[3] | 72 | !! |
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[2602] | 73 | !! ** Action : - pta becomes the after tracer |
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[3] | 74 | !!--------------------------------------------------------------------- |
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[2528] | 75 | INTEGER , INTENT(in ) :: kt ! ocean time-step index |
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[6140] | 76 | INTEGER , INTENT(in ) :: kit000 ! first time step index |
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[2528] | 77 | CHARACTER(len=3) , INTENT(in ) :: cdtype ! =TRA or TRC (tracer indicator) |
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| 78 | INTEGER , INTENT(in ) :: kjpt ! number of tracers |
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[6140] | 79 | REAL(wp) , INTENT(in ) :: p2dt ! tracer time-step |
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[2528] | 80 | REAL(wp), DIMENSION(jpi,jpj,jpk,kjpt), INTENT(in ) :: ptb ! before and now tracer fields |
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[6140] | 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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| 83 | INTEGER :: ji, jj, jk, jn ! dummy loop indices |
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[6140] | 84 | REAL(wp) :: zrhs ! local scalars |
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[5836] | 85 | REAL(wp), POINTER, DIMENSION(:,:,:) :: zwi, zwt, zwd, zws |
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[3] | 86 | !!--------------------------------------------------------------------- |
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[3294] | 87 | ! |
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| 88 | IF( nn_timing == 1 ) CALL timing_start('tra_zdf_imp') |
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| 89 | ! |
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[5836] | 90 | CALL wrk_alloc( jpi,jpj,jpk, zwi, zwt, zwd, zws ) |
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[3294] | 91 | ! |
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| 92 | IF( kt == kit000 ) THEN |
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[457] | 93 | IF(lwp)WRITE(numout,*) |
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[2528] | 94 | IF(lwp)WRITE(numout,*) 'tra_zdf_imp : implicit vertical mixing on ', cdtype |
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[457] | 95 | IF(lwp)WRITE(numout,*) '~~~~~~~~~~~ ' |
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| 96 | ENDIF |
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[2602] | 97 | ! ! ============= ! |
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| 98 | DO jn = 1, kjpt ! tracer loop ! |
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| 99 | ! ! ============= ! |
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[2528] | 100 | ! Matrix construction |
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[2602] | 101 | ! -------------------- |
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| 102 | ! Build matrix if temperature or salinity (only in double diffusion case) or first passive tracer |
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| 103 | ! |
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[2715] | 104 | IF( ( cdtype == 'TRA' .AND. ( jn == jp_tem .OR. ( jn == jp_sal .AND. lk_zdfddm ) ) ) .OR. & |
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[2602] | 105 | & ( cdtype == 'TRC' .AND. jn == 1 ) ) THEN |
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| 106 | ! |
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| 107 | ! vertical mixing coef.: avt for temperature, avs for salinity and passive tracers |
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| 108 | IF( cdtype == 'TRA' .AND. jn == jp_tem ) THEN ; zwt(:,:,2:jpk) = avt (:,:,2:jpk) |
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| 109 | ELSE ; zwt(:,:,2:jpk) = fsavs(:,:,2:jpk) |
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[2528] | 110 | ENDIF |
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[5836] | 111 | zwt(:,:,1) = 0._wp |
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| 112 | ! |
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| 113 | IF( l_ldfslp ) THEN ! isoneutral diffusion: add the contribution |
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| 114 | IF( ln_traldf_msc ) THEN ! MSC iso-neutral operator |
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| 115 | DO jk = 2, jpkm1 |
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| 116 | DO jj = 2, jpjm1 |
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| 117 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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| 118 | zwt(ji,jj,jk) = zwt(ji,jj,jk) + akz(ji,jj,jk) |
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| 119 | END DO |
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[2528] | 120 | END DO |
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| 121 | END DO |
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[5836] | 122 | ELSE ! standard or triad iso-neutral operator |
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| 123 | DO jk = 2, jpkm1 |
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| 124 | DO jj = 2, jpjm1 |
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| 125 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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| 126 | zwt(ji,jj,jk) = zwt(ji,jj,jk) + ah_wslp2(ji,jj,jk) |
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| 127 | END DO |
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[2528] | 128 | END DO |
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| 129 | END DO |
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[5836] | 130 | ENDIF |
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[2528] | 131 | ENDIF |
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[5836] | 132 | ! |
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[2602] | 133 | ! Diagonal, lower (i), upper (s) (including the bottom boundary condition since avt is masked) |
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[2528] | 134 | DO jk = 1, jpkm1 |
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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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[6140] | 137 | !!gm BUG I think, use e3w_a instead of e3w_n |
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| 138 | zwi(ji,jj,jk) = - p2dt * zwt(ji,jj,jk ) / e3w_n(ji,jj,jk ) |
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| 139 | zws(ji,jj,jk) = - p2dt * zwt(ji,jj,jk+1) / e3w_n(ji,jj,jk+1) |
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| 140 | zwd(ji,jj,jk) = e3t_a(ji,jj,jk) - zwi(ji,jj,jk) - zws(ji,jj,jk) |
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[2528] | 141 | END DO |
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| 142 | END DO |
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[3] | 143 | END DO |
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[2528] | 144 | ! |
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[2602] | 145 | !! Matrix inversion from the first level |
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| 146 | !!---------------------------------------------------------------------- |
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| 147 | ! solve m.x = y where m is a tri diagonal matrix ( jpk*jpk ) |
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| 148 | ! |
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| 149 | ! ( zwd1 zws1 0 0 0 )( zwx1 ) ( zwy1 ) |
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| 150 | ! ( zwi2 zwd2 zws2 0 0 )( zwx2 ) ( zwy2 ) |
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| 151 | ! ( 0 zwi3 zwd3 zws3 0 )( zwx3 )=( zwy3 ) |
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| 152 | ! ( ... )( ... ) ( ... ) |
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| 153 | ! ( 0 0 0 zwik zwdk )( zwxk ) ( zwyk ) |
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| 154 | ! |
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| 155 | ! m is decomposed in the product of an upper and lower triangular matrix. |
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| 156 | ! The 3 diagonal terms are in 3d arrays: zwd, zws, zwi. |
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| 157 | ! Suffices i,s and d indicate "inferior" (below diagonal), diagonal |
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| 158 | ! and "superior" (above diagonal) components of the tridiagonal system. |
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| 159 | ! The solution will be in the 4d array pta. |
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| 160 | ! The 3d array zwt is used as a work space array. |
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| 161 | ! En route to the solution pta is used a to evaluate the rhs and then |
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| 162 | ! used as a work space array: its value is modified. |
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| 163 | ! |
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[6140] | 164 | DO jj = 2, jpjm1 !* 1st recurrence: Tk = Dk - Ik Sk-1 / Tk-1 (increasing k) |
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| 165 | DO ji = fs_2, fs_jpim1 ! done one for all passive tracers (so included in the IF instruction) |
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[5120] | 166 | zwt(ji,jj,1) = zwd(ji,jj,1) |
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| 167 | END DO |
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| 168 | END DO |
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| 169 | DO jk = 2, jpkm1 |
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| 170 | DO jj = 2, jpjm1 |
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| 171 | DO ji = fs_2, fs_jpim1 |
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[4990] | 172 | zwt(ji,jj,jk) = zwd(ji,jj,jk) - zwi(ji,jj,jk) * zws(ji,jj,jk-1) / zwt(ji,jj,jk-1) |
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[2528] | 173 | END DO |
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| 174 | END DO |
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| 175 | END DO |
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| 176 | ! |
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[6140] | 177 | ENDIF |
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[2602] | 178 | ! |
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[6140] | 179 | DO jj = 2, jpjm1 !* 2nd recurrence: Zk = Yk - Ik / Tk-1 Zk-1 |
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[457] | 180 | DO ji = fs_2, fs_jpim1 |
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[6140] | 181 | pta(ji,jj,1,jn) = e3t_b(ji,jj,1) * ptb(ji,jj,1,jn) + p2dt * e3t_n(ji,jj,1) * pta(ji,jj,1,jn) |
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[5120] | 182 | END DO |
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| 183 | END DO |
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| 184 | DO jk = 2, jpkm1 |
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| 185 | DO jj = 2, jpjm1 |
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| 186 | DO ji = fs_2, fs_jpim1 |
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[6140] | 187 | zrhs = e3t_b(ji,jj,jk) * ptb(ji,jj,jk,jn) + p2dt * e3t_n(ji,jj,jk) * pta(ji,jj,jk,jn) ! zrhs=right hand side |
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[2528] | 188 | pta(ji,jj,jk,jn) = zrhs - zwi(ji,jj,jk) / zwt(ji,jj,jk-1) * pta(ji,jj,jk-1,jn) |
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| 189 | END DO |
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[3] | 190 | END DO |
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| 191 | END DO |
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[6140] | 192 | ! |
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| 193 | DO jj = 2, jpjm1 !* 3d recurrence: Xk = (Zk - Sk Xk+1 ) / Tk (result is the after tracer) |
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[457] | 194 | DO ji = fs_2, fs_jpim1 |
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[2528] | 195 | pta(ji,jj,jpkm1,jn) = pta(ji,jj,jpkm1,jn) / zwt(ji,jj,jpkm1) * tmask(ji,jj,jpkm1) |
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[5120] | 196 | END DO |
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| 197 | END DO |
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| 198 | DO jk = jpk-2, 1, -1 |
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| 199 | DO jj = 2, jpjm1 |
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| 200 | DO ji = fs_2, fs_jpim1 |
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[2528] | 201 | pta(ji,jj,jk,jn) = ( pta(ji,jj,jk,jn) - zws(ji,jj,jk) * pta(ji,jj,jk+1,jn) ) & |
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| 202 | & / zwt(ji,jj,jk) * tmask(ji,jj,jk) |
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| 203 | END DO |
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[457] | 204 | END DO |
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| 205 | END DO |
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[2602] | 206 | ! ! ================= ! |
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| 207 | END DO ! end tracer loop ! |
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| 208 | ! ! ================= ! |
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[1438] | 209 | ! |
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[5836] | 210 | CALL wrk_dealloc( jpi,jpj,jpk, zwi, zwt, zwd, zws ) |
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[2715] | 211 | ! |
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[3294] | 212 | IF( nn_timing == 1 ) CALL timing_stop('tra_zdf_imp') |
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| 213 | ! |
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[3] | 214 | END SUBROUTINE tra_zdf_imp |
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| 215 | |
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| 216 | !!============================================================================== |
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| 217 | END MODULE trazdf_imp |
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