| 1 | MODULE dynldf_lap |
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| 2 | !!====================================================================== |
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| 3 | !! *** MODULE dynldf_lap *** |
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| 4 | !! Ocean dynamics: lateral viscosity trend |
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| 5 | !!====================================================================== |
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| 6 | !! History : OPA ! 1990-09 (G. Madec) Original code |
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| 7 | !! 4.0 ! 1991-11 (G. Madec) |
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| 8 | !! 6.0 ! 1996-01 (G. Madec) statement function for e3 and ahm |
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| 9 | !! NEMO 1.0 ! 2002-06 (G. Madec) F90: Free form and module |
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| 10 | !! - ! 2004-08 (C. Talandier) New trends organization |
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| 11 | !!---------------------------------------------------------------------- |
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| 12 | |
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| 13 | !!---------------------------------------------------------------------- |
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| 14 | !! dyn_ldf_lap : update the momentum trend with the lateral diffusion |
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| 15 | !! using an iso-level harmonic operator |
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| 16 | !!---------------------------------------------------------------------- |
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| 17 | USE oce ! ocean dynamics and tracers |
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| 18 | USE dom_oce ! ocean space and time domain |
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| 19 | USE ldfdyn_oce ! ocean dynamics: lateral physics |
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| 20 | USE zdf_oce ! ocean vertical physics |
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| 21 | ! |
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| 22 | USE in_out_manager ! I/O manager |
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| 23 | USE timing ! Timing |
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| 24 | |
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| 25 | USE yomhook, ONLY: lhook, dr_hook |
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| 26 | USE parkind1, ONLY: jprb, jpim |
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| 27 | |
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| 28 | IMPLICIT NONE |
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| 29 | PRIVATE |
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| 30 | |
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| 31 | PUBLIC dyn_ldf_lap ! called by step.F90 |
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| 32 | |
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| 33 | !! * Substitutions |
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| 34 | # include "domzgr_substitute.h90" |
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| 35 | # include "ldfdyn_substitute.h90" |
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| 36 | # include "vectopt_loop_substitute.h90" |
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| 37 | !!---------------------------------------------------------------------- |
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| 38 | !! NEMO/OPA 3.3 , NEMO Consortium (2010) |
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| 39 | !! $Id$ |
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| 40 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
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| 41 | !!---------------------------------------------------------------------- |
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| 42 | CONTAINS |
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| 43 | |
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| 44 | SUBROUTINE dyn_ldf_lap( kt ) |
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| 45 | !!---------------------------------------------------------------------- |
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| 46 | !! *** ROUTINE dyn_ldf_lap *** |
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| 47 | !! |
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| 48 | !! ** Purpose : Compute the before horizontal tracer (t & s) diffusive |
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| 49 | !! trend and add it to the general trend of tracer equation. |
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| 50 | !! |
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| 51 | !! ** Method : The before horizontal momentum diffusion trend is an |
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| 52 | !! harmonic operator (laplacian type) which separates the divergent |
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| 53 | !! and rotational parts of the flow. |
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| 54 | !! Its horizontal components are computed as follow: |
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| 55 | !! difu = 1/e1u di[ahmt hdivb] - 1/(e2u*e3u) dj-1[e3f ahmf rotb] |
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| 56 | !! difv = 1/e2v dj[ahmt hdivb] + 1/(e1v*e3v) di-1[e3f ahmf rotb] |
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| 57 | !! in the rotational part of the diffusion. |
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| 58 | !! Add this before trend to the general trend (ua,va): |
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| 59 | !! (ua,va) = (ua,va) + (diffu,diffv) |
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| 60 | !! |
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| 61 | !! ** Action : - Update (ua,va) with the iso-level harmonic mixing trend |
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| 62 | !!---------------------------------------------------------------------- |
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| 63 | INTEGER, INTENT( in ) :: kt ! ocean time-step index |
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| 64 | ! |
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| 65 | INTEGER :: ji, jj, jk ! dummy loop indices |
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| 66 | REAL(wp) :: zua, zva, ze2u, ze1v ! local scalars |
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| 67 | INTEGER(KIND=jpim), PARAMETER :: zhook_in = 0 |
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| 68 | INTEGER(KIND=jpim), PARAMETER :: zhook_out = 1 |
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| 69 | REAL(KIND=jprb) :: zhook_handle |
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| 70 | |
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| 71 | CHARACTER(LEN=*), PARAMETER :: RoutineName='DYN_LDF_LAP' |
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| 72 | |
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| 73 | IF (lhook) CALL dr_hook(RoutineName,zhook_in,zhook_handle) |
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| 74 | |
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| 75 | !!---------------------------------------------------------------------- |
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| 76 | ! |
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| 77 | IF( nn_timing == 1 ) CALL timing_start('dyn_ldf_lap') |
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| 78 | ! |
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| 79 | IF( kt == nit000 ) THEN |
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| 80 | IF(lwp) WRITE(numout,*) |
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| 81 | IF(lwp) WRITE(numout,*) 'dyn_ldf : iso-level harmonic (laplacian) operator' |
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| 82 | IF(lwp) WRITE(numout,*) '~~~~~~~ ' |
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| 83 | ENDIF |
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| 84 | ! ! =============== |
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| 85 | DO jk = 1, jpkm1 ! Horizontal slab |
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| 86 | ! ! =============== |
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| 87 | DO jj = 2, jpjm1 |
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| 88 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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| 89 | ze2u = rotb (ji,jj,jk) * fsahmf(ji,jj,jk) * fse3f(ji,jj,jk) |
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| 90 | ze1v = hdivb(ji,jj,jk) * fsahmt(ji,jj,jk) |
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| 91 | ! horizontal diffusive trends |
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| 92 | zua = - ( ze2u - rotb (ji,jj-1,jk)*fsahmf(ji,jj-1,jk)*fse3f(ji,jj-1,jk) ) / ( e2u(ji,jj) * fse3u(ji,jj,jk) ) & |
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| 93 | + ( hdivb(ji+1,jj,jk)*fsahmt(ji+1,jj,jk) - ze1v ) / e1u(ji,jj) |
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| 94 | |
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| 95 | zva = + ( ze2u - rotb (ji-1,jj,jk)*fsahmf(ji-1,jj,jk)*fse3f(ji-1,jj,jk) ) / ( e1v(ji,jj) * fse3v(ji,jj,jk) ) & |
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| 96 | + ( hdivb(ji,jj+1,jk)*fsahmt(ji,jj+1,jk) - ze1v ) / e2v(ji,jj) |
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| 97 | |
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| 98 | ! add it to the general momentum trends |
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| 99 | ua(ji,jj,jk) = ua(ji,jj,jk) + zua |
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| 100 | va(ji,jj,jk) = va(ji,jj,jk) + zva |
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| 101 | END DO |
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| 102 | END DO |
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| 103 | ! ! =============== |
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| 104 | END DO ! End of slab |
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| 105 | ! ! =============== |
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| 106 | IF( nn_timing == 1 ) CALL timing_stop('dyn_ldf_lap') |
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| 107 | ! |
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| 108 | IF (lhook) CALL dr_hook(RoutineName,zhook_out,zhook_handle) |
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| 109 | END SUBROUTINE dyn_ldf_lap |
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| 110 | |
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| 111 | !!====================================================================== |
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| 112 | END MODULE dynldf_lap |
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