[3] | 1 | MODULE dynnxt |
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| 2 | !!====================================================================== |
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| 3 | !! *** MODULE dynnxt *** |
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| 4 | !! Ocean dynamics: time stepping |
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| 5 | !!====================================================================== |
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| 6 | |
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| 7 | !!---------------------------------------------------------------------- |
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| 8 | !! dyn_nxt : update the horizontal velocity from the momentum trend |
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| 9 | !!---------------------------------------------------------------------- |
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| 10 | !! * Modules used |
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| 11 | USE oce ! ocean dynamics and tracers |
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| 12 | USE dom_oce ! ocean space and time domain |
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| 13 | USE in_out_manager ! I/O manager |
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| 14 | USE obcdyn ! open boundary condition for momentum (obc_dyn routine) |
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| 15 | USE lbclnk ! lateral boundary condition (or mpp link) |
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| 16 | |
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| 17 | IMPLICIT NONE |
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| 18 | PRIVATE |
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| 19 | |
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| 20 | !! * Accessibility |
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| 21 | PUBLIC dyn_nxt ! routine called by step.F90 |
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| 22 | !!---------------------------------------------------------------------- |
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| 23 | |
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| 24 | CONTAINS |
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| 25 | |
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| 26 | SUBROUTINE dyn_nxt ( kt ) |
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| 27 | !!---------------------------------------------------------------------- |
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| 28 | !! *** ROUTINE dyn_nxt *** |
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| 29 | !! |
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| 30 | !! ** Purpose : Compute the after horizontal velocity from the |
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| 31 | !! momentum trend. |
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| 32 | !! |
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| 33 | !! ** Method : Apply lateral boundary conditions on the trends (ua,va) |
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| 34 | !! through calls to routine lbc_lnk. |
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| 35 | !! After velocity is compute using a leap-frog scheme environment: |
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| 36 | !! (ua,va) = (ub,vb) + 2 rdt (ua,va) |
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[32] | 37 | !! Note that if lk_dynspg_fsc=T, the time stepping has already been |
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| 38 | !! performed in dynspg module |
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[3] | 39 | !! Time filter applied on now horizontal velocity to avoid the |
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| 40 | !! divergence of two consecutive time-steps and swap of dynamics |
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| 41 | !! arrays to start the next time step: |
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| 42 | !! (ub,vb) = (un,vn) + atfp [ (ub,vb) + (ua,va) - 2 (un,vn) ] |
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| 43 | !! (un,vn) = (ua,va) |
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| 44 | !! |
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| 45 | !! ** Action : - Update ub,vb arrays, the before horizontal velocity |
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| 46 | !! - Update un,vn arrays, the now horizontal velocity |
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| 47 | !! |
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| 48 | !! History : |
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| 49 | !! ! 87-02 (P. Andrich, D. L Hostis) Original code |
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| 50 | !! ! 90-10 (C. Levy, G. Madec) |
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| 51 | !! ! 93-03 (M. Guyon) symetrical conditions |
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| 52 | !! ! 97-02 (G. Madec & M. Imbard) opa, release 8.0 |
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| 53 | !! ! 97-04 (A. Weaver) Euler forward step |
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| 54 | !! ! 97-06 (G. Madec) lateral boudary cond., lbc routine |
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| 55 | !! 8.5 ! 02-08 (G. Madec) F90: Free form and module |
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| 56 | !! ! 02-10 (C. Talandier, A-M. Treguier) Open boundary cond. |
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| 57 | !!---------------------------------------------------------------------- |
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| 58 | !! * Arguments |
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| 59 | INTEGER, INTENT( in ) :: kt ! ocean time-step index |
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| 60 | |
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| 61 | !! * Local declarations |
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| 62 | INTEGER :: ji, jj, jk ! dummy loop indices |
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| 63 | REAL(wp) :: z2dt ! temporary scalar |
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| 64 | !!---------------------------------------------------------------------- |
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| 65 | !! OPA 8.5, LODYC-IPSL (2002) |
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| 66 | !!---------------------------------------------------------------------- |
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| 67 | |
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| 68 | IF( kt == nit000 ) THEN |
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| 69 | IF(lwp) WRITE(numout,*) |
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| 70 | IF(lwp) WRITE(numout,*) 'dyn_nxt : time stepping' |
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| 71 | IF(lwp) WRITE(numout,*) '~~~~~~~' |
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| 72 | ENDIF |
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| 73 | |
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| 74 | ! Local constant initialization |
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| 75 | z2dt = 2. * rdt |
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| 76 | IF( neuler == 0 .AND. kt == nit000 ) z2dt = rdt |
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| 77 | |
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| 78 | ! Lateral boundary conditions on ( ua, va ) |
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| 79 | CALL lbc_lnk( ua, 'U', -1. ) |
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| 80 | CALL lbc_lnk( va, 'V', -1. ) |
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| 81 | |
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| 82 | ! ! =============== |
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| 83 | DO jk = 1, jpkm1 ! Horizontal slab |
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| 84 | ! ! =============== |
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| 85 | ! Next velocity |
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| 86 | ! ------------- |
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| 87 | #if defined key_dynspg_fsc |
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| 88 | ! Leap-frog time stepping already done in dynspg.F routine |
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| 89 | #else |
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| 90 | DO jj = 1, jpj ! caution: don't use (:,:) for this loop |
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| 91 | DO ji = 1, jpi ! it causes optimization problems on NEC in auto-tasking |
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| 92 | ! Leap-frog time stepping |
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| 93 | ua(ji,jj,jk) = ( ub(ji,jj,jk) + z2dt * ua(ji,jj,jk) ) * umask(ji,jj,jk) |
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| 94 | va(ji,jj,jk) = ( vb(ji,jj,jk) + z2dt * va(ji,jj,jk) ) * vmask(ji,jj,jk) |
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| 95 | END DO |
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| 96 | END DO |
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| 97 | # if defined key_obc |
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| 98 | ! ! =============== |
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| 99 | END DO ! End of slab |
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| 100 | ! ! =============== |
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| 101 | ! Update (ua,va) along open boundaries (only in the rigid-lid case) |
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| 102 | CALL obc_dyn( kt ) |
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| 103 | ! ! =============== |
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| 104 | DO jk = 1, jpkm1 ! Horizontal slab |
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| 105 | ! ! =============== |
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| 106 | # endif |
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| 107 | #endif |
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| 108 | ! Time filter and swap of dynamics arrays |
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| 109 | ! ------------------------------------------ |
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| 110 | IF( neuler == 0 .AND. kt == nit000 ) THEN |
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| 111 | DO jj = 1, jpj ! caution: don't use (:,:) for this loop |
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| 112 | DO ji = 1, jpi ! it causes optimization problems on NEC in auto-tasking |
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| 113 | ! Euler (forward) time stepping |
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| 114 | ub(ji,jj,jk) = un(ji,jj,jk) |
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| 115 | vb(ji,jj,jk) = vn(ji,jj,jk) |
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| 116 | un(ji,jj,jk) = ua(ji,jj,jk) |
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| 117 | vn(ji,jj,jk) = va(ji,jj,jk) |
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| 118 | END DO |
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| 119 | END DO |
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| 120 | ELSE |
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| 121 | DO jj = 1, jpj ! caution: don't use (:,:) for this loop |
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| 122 | DO ji = 1, jpi ! it causes optimization problems on NEC in auto-tasking |
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| 123 | ! Leap-frog time stepping |
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| 124 | ub(ji,jj,jk) = atfp * ( ub(ji,jj,jk) + ua(ji,jj,jk) ) + atfp1 * un(ji,jj,jk) |
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| 125 | vb(ji,jj,jk) = atfp * ( vb(ji,jj,jk) + va(ji,jj,jk) ) + atfp1 * vn(ji,jj,jk) |
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| 126 | un(ji,jj,jk) = ua(ji,jj,jk) |
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| 127 | vn(ji,jj,jk) = va(ji,jj,jk) |
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| 128 | END DO |
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| 129 | END DO |
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| 130 | ENDIF |
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| 131 | ! ! =============== |
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| 132 | END DO ! End of slab |
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| 133 | ! ! =============== |
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| 134 | |
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[106] | 135 | IF(l_ctl) WRITE(numout,*) ' nxt - Un: ', SUM(un(2:nictl,2:njctl,1:jpkm1)*umask(2:nictl,2:njctl,1:jpkm1)), & |
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| 136 | & ' Vn: ', SUM(vn(2:nictl,2:njctl,1:jpkm1)*vmask(2:nictl,2:njctl,1:jpkm1)) |
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[3] | 137 | |
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| 138 | END SUBROUTINE dyn_nxt |
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| 139 | |
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| 140 | !!====================================================================== |
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| 141 | END MODULE dynnxt |
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