[3] | 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 | |
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| 7 | !!---------------------------------------------------------------------- |
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| 8 | !! dyn_ldf_lap : update the momentum trend with the lateral diffusion |
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| 9 | !! using an iso-level harmonic operator |
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| 10 | !!---------------------------------------------------------------------- |
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| 11 | !! * Modules used |
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| 12 | USE oce ! ocean dynamics and tracers |
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| 13 | USE dom_oce ! ocean space and time domain |
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| 14 | USE ldfdyn_oce ! ocean dynamics: lateral physics |
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| 15 | USE zdf_oce ! ocean vertical physics |
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| 16 | USE in_out_manager ! I/O manager |
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[216] | 17 | USE trdmod ! ocean dynamics trends |
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| 18 | USE trdmod_oce ! ocean variables trends |
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[3] | 19 | USE ldfslp ! iso-neutral slopes |
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| 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 dyn_ldf_lap ! called by step.F90 |
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| 26 | |
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| 27 | !! * Substitutions |
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| 28 | # include "domzgr_substitute.h90" |
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| 29 | # include "ldfdyn_substitute.h90" |
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| 30 | # include "vectopt_loop_substitute.h90" |
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| 31 | !!---------------------------------------------------------------------- |
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[247] | 32 | !! OPA 9.0 , LOCEAN-IPSL (2005) |
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| 33 | !! $Header$ |
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| 34 | !! This software is governed by the CeCILL licence see modipsl/doc/NEMO_CeCILL.txt |
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[3] | 35 | !!---------------------------------------------------------------------- |
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| 36 | |
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| 37 | CONTAINS |
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| 38 | |
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| 39 | SUBROUTINE dyn_ldf_lap( kt ) |
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| 40 | !!---------------------------------------------------------------------- |
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| 41 | !! *** ROUTINE dyn_ldf_lap *** |
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| 42 | !! |
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| 43 | !! ** Purpose : Compute the before horizontal tracer (t & s) diffusive |
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| 44 | !! trend and add it to the general trend of tracer equation. |
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| 45 | !! |
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| 46 | !! ** Method : The before horizontal momentum diffusion trend is an |
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| 47 | !! harmonic operator (laplacian type) which separates the divergent |
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| 48 | !! and rotational parts of the flow. |
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| 49 | !! Its horizontal components are computed as follow: |
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| 50 | !! difu = 1/e1u di[ahmt hdivb] - 1/(e2u*e3u) dj-1[e3f ahmf rotb] |
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| 51 | !! difv = 1/e2v dj[ahmt hdivb] + 1/(e1v*e3v) di-1[e3f ahmf rotb] |
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[455] | 52 | !! If lk_zco=T, e3f=e3u=e3v, the vertical scale factor are simplified |
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| 53 | !! in the rotational part of the diffusion. |
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[3] | 54 | !! Add this before trend to the general trend (ua,va): |
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| 55 | !! (ua,va) = (ua,va) + (diffu,diffv) |
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| 56 | !! 'key_trddyn' activated: the two components of the horizontal |
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| 57 | !! diffusion trend are saved. |
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| 58 | !! |
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| 59 | !! ** Action : - Update (ua,va) with the before iso-level harmonic |
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| 60 | !! mixing trend. |
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| 61 | !! |
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| 62 | !! History : |
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| 63 | !! ! 90-09 (G. Madec) Original code |
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| 64 | !! ! 91-11 (G. Madec) |
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| 65 | !! ! 96-01 (G. Madec) statement function for e3 and ahm |
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[216] | 66 | !! 8.5 ! 02-06 (G. Madec) F90: Free form and module |
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| 67 | !! 9.0 ! 04-08 (C. Talandier) New trends organization |
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[3] | 68 | !!---------------------------------------------------------------------- |
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| 69 | !! * Arguments |
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[216] | 70 | INTEGER, INTENT( in ) :: kt ! ocean time-step index |
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[3] | 71 | |
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| 72 | !! * Local declarations |
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[216] | 73 | INTEGER :: ji, jj, jk ! dummy loop indices |
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[3] | 74 | REAL(wp) :: & |
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[216] | 75 | zua, zva, ze2u, ze1v ! temporary scalars |
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[3] | 76 | !!---------------------------------------------------------------------- |
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| 77 | |
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| 78 | IF( kt == nit000 ) THEN |
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| 79 | IF(lwp) WRITE(numout,*) |
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| 80 | IF(lwp) WRITE(numout,*) 'dyn_ldf : iso-level harmonic (laplacien) operator' |
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| 81 | IF(lwp) WRITE(numout,*) '~~~~~~~ ' |
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| 82 | ENDIF |
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| 83 | |
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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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[455] | 89 | #if defined key_zco |
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| 90 | ! horizontal diffusive trends |
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| 91 | ze2u = rotb (ji,jj,jk)*fsahmf(ji,jj,jk) |
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| 92 | ze1v = hdivb(ji,jj,jk)*fsahmt(ji,jj,jk) |
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| 93 | zua = - ( ze2u - rotb (ji,jj-1,jk)*fsahmf(ji,jj-1,jk) ) / e2u(ji,jj) & |
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| 94 | + ( hdivb(ji+1,jj,jk)*fsahmt(ji+1,jj,jk) - ze1v ) / e1u(ji,jj) |
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| 95 | |
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| 96 | zva = + ( ze2u - rotb (ji-1,jj,jk)*fsahmf(ji-1,jj,jk) ) / e1v(ji,jj) & |
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| 97 | + ( hdivb(ji,jj+1,jk)*fsahmt(ji,jj+1,jk) - ze1v ) / e2v(ji,jj) |
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| 98 | #else |
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[3] | 99 | ze2u = rotb (ji,jj,jk)*fsahmf(ji,jj,jk)*fse3f(ji,jj,jk) |
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| 100 | ze1v = hdivb(ji,jj,jk)*fsahmt(ji,jj,jk) |
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| 101 | ! horizontal diffusive trends |
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| 102 | 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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| 103 | + ( hdivb(ji+1,jj,jk)*fsahmt(ji+1,jj,jk) - ze1v ) / e1u(ji,jj) |
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| 104 | |
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| 105 | 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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| 106 | + ( hdivb(ji,jj+1,jk)*fsahmt(ji,jj+1,jk) - ze1v ) / e2v(ji,jj) |
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| 107 | #endif |
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| 108 | |
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| 109 | ! add it to the general momentum trends |
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| 110 | ua(ji,jj,jk) = ua(ji,jj,jk) + zua |
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| 111 | va(ji,jj,jk) = va(ji,jj,jk) + zva |
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| 112 | END DO |
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| 113 | END DO |
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| 114 | ! ! =============== |
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| 115 | END DO ! End of slab |
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| 116 | ! ! =============== |
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| 117 | |
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| 118 | END SUBROUTINE dyn_ldf_lap |
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| 119 | |
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| 120 | !!====================================================================== |
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| 121 | END MODULE dynldf_lap |
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