| [3] | 1 | MODULE dynnxt |
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| [1502] | 2 | !!========================================================================= |
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| [3] | 3 | !! *** MODULE dynnxt *** |
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| 4 | !! Ocean dynamics: time stepping |
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| [1502] | 5 | !!========================================================================= |
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| [1438] | 6 | !! History : OPA ! 1987-02 (P. Andrich, D. L Hostis) Original code |
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| 7 | !! ! 1990-10 (C. Levy, G. Madec) |
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| 8 | !! 7.0 ! 1993-03 (M. Guyon) symetrical conditions |
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| 9 | !! 8.0 ! 1997-02 (G. Madec & M. Imbard) opa, release 8.0 |
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| 10 | !! 8.2 ! 1997-04 (A. Weaver) Euler forward step |
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| 11 | !! - ! 1997-06 (G. Madec) lateral boudary cond., lbc routine |
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| 12 | !! NEMO 1.0 ! 2002-08 (G. Madec) F90: Free form and module |
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| 13 | !! - ! 2002-10 (C. Talandier, A-M. Treguier) Open boundary cond. |
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| 14 | !! 2.0 ! 2005-11 (V. Garnier) Surface pressure gradient organization |
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| 15 | !! 2.3 ! 2007-07 (D. Storkey) Calls to BDY routines. |
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| [1502] | 16 | !! 3.2 ! 2009-06 (G. Madec, R.Benshila) re-introduce the vvl option |
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| [2528] | 17 | !! 3.3 ! 2010-09 (D. Storkey, E.O'Dea) Bug fix for BDY module |
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| [1502] | 18 | !!------------------------------------------------------------------------- |
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| [1438] | 19 | |
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| [1502] | 20 | !!------------------------------------------------------------------------- |
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| 21 | !! dyn_nxt : obtain the next (after) horizontal velocity |
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| 22 | !!------------------------------------------------------------------------- |
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| [3] | 23 | USE oce ! ocean dynamics and tracers |
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| 24 | USE dom_oce ! ocean space and time domain |
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| [2528] | 25 | USE sbc_oce ! Surface boundary condition: ocean fields |
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| 26 | USE phycst ! physical constants |
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| [1502] | 27 | USE dynspg_oce ! type of surface pressure gradient |
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| 28 | USE dynadv ! dynamics: vector invariant versus flux form |
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| 29 | USE domvvl ! variable volume |
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| [367] | 30 | USE obc_oce ! ocean open boundary conditions |
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| [3] | 31 | USE obcdyn ! open boundary condition for momentum (obc_dyn routine) |
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| [367] | 32 | USE obcdyn_bt ! 2D open boundary condition for momentum (obc_dyn_bt routine) |
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| 33 | USE obcvol ! ocean open boundary condition (obc_vol routines) |
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| [911] | 34 | USE bdy_oce ! unstructured open boundary conditions |
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| 35 | USE bdydta ! unstructured open boundary conditions |
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| 36 | USE bdydyn ! unstructured open boundary conditions |
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| [1502] | 37 | USE in_out_manager ! I/O manager |
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| [3] | 38 | USE lbclnk ! lateral boundary condition (or mpp link) |
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| [2715] | 39 | USE lib_mpp ! MPP library |
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| [258] | 40 | USE prtctl ! Print control |
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| [2528] | 41 | #if defined key_agrif |
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| 42 | USE agrif_opa_interp |
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| 43 | #endif |
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| [3] | 44 | |
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| 45 | IMPLICIT NONE |
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| 46 | PRIVATE |
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| 47 | |
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| [1438] | 48 | PUBLIC dyn_nxt ! routine called by step.F90 |
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| 49 | |
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| [592] | 50 | !! * Substitutions |
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| 51 | # include "domzgr_substitute.h90" |
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| [2715] | 52 | !!---------------------------------------------------------------------- |
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| [2528] | 53 | !! NEMO/OPA 3.3 , NEMO Consortium (2010) |
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| [1438] | 54 | !! $Id$ |
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| [2715] | 55 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
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| 56 | !!---------------------------------------------------------------------- |
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| [3] | 57 | CONTAINS |
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| 58 | |
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| 59 | SUBROUTINE dyn_nxt ( kt ) |
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| 60 | !!---------------------------------------------------------------------- |
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| 61 | !! *** ROUTINE dyn_nxt *** |
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| 62 | !! |
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| [1502] | 63 | !! ** Purpose : Compute the after horizontal velocity. Apply the boundary |
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| 64 | !! condition on the after velocity, achieved the time stepping |
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| 65 | !! by applying the Asselin filter on now fields and swapping |
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| 66 | !! the fields. |
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| [3] | 67 | !! |
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| [1502] | 68 | !! ** Method : * After velocity is compute using a leap-frog scheme: |
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| 69 | !! (ua,va) = (ub,vb) + 2 rdt (ua,va) |
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| 70 | !! Note that with flux form advection and variable volume layer |
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| 71 | !! (lk_vvl=T), the leap-frog is applied on thickness weighted |
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| 72 | !! velocity. |
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| 73 | !! Note also that in filtered free surface (lk_dynspg_flt=T), |
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| 74 | !! the time stepping has already been done in dynspg module |
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| [3] | 75 | !! |
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| [1502] | 76 | !! * Apply lateral boundary conditions on after velocity |
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| 77 | !! at the local domain boundaries through lbc_lnk call, |
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| 78 | !! at the radiative open boundaries (lk_obc=T), |
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| 79 | !! at the relaxed open boundaries (lk_bdy=T), and |
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| 80 | !! at the AGRIF zoom boundaries (lk_agrif=T) |
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| [3] | 81 | !! |
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| [1502] | 82 | !! * Apply the time filter applied and swap of the dynamics |
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| 83 | !! arrays to start the next time step: |
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| 84 | !! (ub,vb) = (un,vn) + atfp [ (ub,vb) + (ua,va) - 2 (un,vn) ] |
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| 85 | !! (un,vn) = (ua,va). |
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| 86 | !! Note that with flux form advection and variable volume layer |
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| 87 | !! (lk_vvl=T), the time filter is applied on thickness weighted |
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| 88 | !! velocity. |
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| 89 | !! |
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| 90 | !! ** Action : ub,vb filtered before horizontal velocity of next time-step |
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| 91 | !! un,vn now horizontal velocity of next time-step |
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| [3] | 92 | !!---------------------------------------------------------------------- |
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| [2715] | 93 | USE wrk_nemo, ONLY: wrk_in_use, wrk_not_released |
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| 94 | USE oce , ONLY: ze3u_f => ta , ze3v_f => sa ! (ta,sa) used as 3D workspace |
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| 95 | USE wrk_nemo, ONLY: zs_t => wrk_2d_1 , zs_u_1 => wrk_2d_2 , zs_v_1 => wrk_2d_3 |
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| 96 | ! |
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| [3] | 97 | INTEGER, INTENT( in ) :: kt ! ocean time-step index |
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| [2715] | 98 | ! |
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| [3] | 99 | INTEGER :: ji, jj, jk ! dummy loop indices |
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| [1566] | 100 | #if ! defined key_dynspg_flt |
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| [3] | 101 | REAL(wp) :: z2dt ! temporary scalar |
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| [1566] | 102 | #endif |
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| [2715] | 103 | REAL(wp) :: zue3a, zue3n, zue3b, zuf ! local scalars |
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| 104 | REAL(wp) :: zve3a, zve3n, zve3b, zvf ! - - |
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| 105 | REAL(wp) :: zec, zv_t_ij, zv_t_ip1j, zv_t_ijp1 |
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| [1502] | 106 | !!---------------------------------------------------------------------- |
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| [3] | 107 | |
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| [2715] | 108 | IF( wrk_in_use(2, 1,2,3) ) THEN |
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| 109 | CALL ctl_stop('dyn_nxt: requested workspace arrays unavailable') ; RETURN |
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| 110 | ENDIF |
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| 111 | |
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| [3] | 112 | IF( kt == nit000 ) THEN |
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| 113 | IF(lwp) WRITE(numout,*) |
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| 114 | IF(lwp) WRITE(numout,*) 'dyn_nxt : time stepping' |
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| 115 | IF(lwp) WRITE(numout,*) '~~~~~~~' |
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| 116 | ENDIF |
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| 117 | |
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| [1502] | 118 | #if defined key_dynspg_flt |
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| 119 | ! |
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| 120 | ! Next velocity : Leap-frog time stepping already done in dynspg_flt.F routine |
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| 121 | ! ------------- |
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| [3] | 122 | |
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| [1502] | 123 | ! Update after velocity on domain lateral boundaries (only local domain required) |
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| 124 | ! -------------------------------------------------- |
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| 125 | CALL lbc_lnk( ua, 'U', -1. ) ! local domain boundaries |
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| 126 | CALL lbc_lnk( va, 'V', -1. ) |
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| 127 | ! |
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| 128 | #else |
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| 129 | ! Next velocity : Leap-frog time stepping |
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| [1438] | 130 | ! ------------- |
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| [1502] | 131 | z2dt = 2. * rdt ! Euler or leap-frog time step |
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| 132 | IF( neuler == 0 .AND. kt == nit000 ) z2dt = rdt |
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| 133 | ! |
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| 134 | IF( ln_dynadv_vec .OR. .NOT. lk_vvl ) THEN ! applied on velocity |
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| [1438] | 135 | DO jk = 1, jpkm1 |
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| [1502] | 136 | ua(:,:,jk) = ( ub(:,:,jk) + z2dt * ua(:,:,jk) ) * umask(:,:,jk) |
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| 137 | va(:,:,jk) = ( vb(:,:,jk) + z2dt * va(:,:,jk) ) * vmask(:,:,jk) |
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| 138 | END DO |
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| 139 | ELSE ! applied on thickness weighted velocity |
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| 140 | DO jk = 1, jpkm1 |
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| 141 | ua(:,:,jk) = ( ub(:,:,jk) * fse3u_b(:,:,jk) & |
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| 142 | & + z2dt * ua(:,:,jk) * fse3u_n(:,:,jk) ) & |
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| [1438] | 143 | & / fse3u_a(:,:,jk) * umask(:,:,jk) |
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| [1502] | 144 | va(:,:,jk) = ( vb(:,:,jk) * fse3v_b(:,:,jk) & |
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| 145 | & + z2dt * va(:,:,jk) * fse3v_n(:,:,jk) ) & |
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| [1438] | 146 | & / fse3v_a(:,:,jk) * vmask(:,:,jk) |
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| [592] | 147 | END DO |
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| 148 | ENDIF |
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| 149 | |
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| [1502] | 150 | |
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| 151 | ! Update after velocity on domain lateral boundaries |
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| 152 | ! -------------------------------------------------- |
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| 153 | CALL lbc_lnk( ua, 'U', -1. ) !* local domain boundaries |
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| 154 | CALL lbc_lnk( va, 'V', -1. ) |
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| 155 | ! |
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| [3] | 156 | # if defined key_obc |
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| [1502] | 157 | ! !* OBC open boundaries |
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| [2528] | 158 | CALL obc_dyn( kt ) |
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| [1502] | 159 | ! |
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| [2715] | 160 | IF( .NOT. lk_dynspg_flt ) THEN |
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| [1502] | 161 | ! Flather boundary condition : - Update sea surface height on each open boundary |
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| [2715] | 162 | ! sshn (= after ssh ) for explicit case (lk_dynspg_exp=T) |
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| 163 | ! sshn_b (= after ssha_b) for time-splitting case (lk_dynspg_ts=T) |
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| [1502] | 164 | ! - Correct the barotropic velocities |
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| [367] | 165 | CALL obc_dyn_bt( kt ) |
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| [1438] | 166 | ! |
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| [1502] | 167 | !!gm ERROR - potential BUG: sshn should not be modified at this stage !! ssh_nxt not alrady called |
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| 168 | CALL lbc_lnk( sshn, 'T', 1. ) ! Boundary conditions on sshn |
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| [1438] | 169 | ! |
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| 170 | IF( ln_vol_cst ) CALL obc_vol( kt ) |
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| 171 | ! |
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| 172 | IF(ln_ctl) CALL prt_ctl( tab2d_1=sshn, clinfo1=' ssh : ', mask1=tmask ) |
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| [367] | 173 | ENDIF |
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| [1502] | 174 | ! |
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| [1125] | 175 | # elif defined key_bdy |
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| [1502] | 176 | ! !* BDY open boundaries |
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| [2715] | 177 | IF( .NOT. lk_dynspg_flt ) CALL bdy_dyn_frs( kt ) |
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| [1438] | 178 | # endif |
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| [1502] | 179 | ! |
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| [392] | 180 | # if defined key_agrif |
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| [1502] | 181 | CALL Agrif_dyn( kt ) !* AGRIF zoom boundaries |
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| [389] | 182 | # endif |
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| [3] | 183 | #endif |
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| [592] | 184 | |
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| [1438] | 185 | ! Time filter and swap of dynamics arrays |
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| 186 | ! ------------------------------------------ |
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| [1502] | 187 | IF( neuler == 0 .AND. kt == nit000 ) THEN !* Euler at first time-step: only swap |
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| 188 | DO jk = 1, jpkm1 |
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| 189 | un(:,:,jk) = ua(:,:,jk) ! un <-- ua |
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| [1438] | 190 | vn(:,:,jk) = va(:,:,jk) |
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| 191 | END DO |
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| [1502] | 192 | ELSE !* Leap-Frog : Asselin filter and swap |
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| [2528] | 193 | ! ! =============! |
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| 194 | IF( .NOT. lk_vvl ) THEN ! Fixed volume ! |
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| 195 | ! ! =============! |
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| [1502] | 196 | DO jk = 1, jpkm1 |
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| [592] | 197 | DO jj = 1, jpj |
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| [1502] | 198 | DO ji = 1, jpi |
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| [2528] | 199 | zuf = un(ji,jj,jk) + atfp * ( ub(ji,jj,jk) - 2.e0 * un(ji,jj,jk) + ua(ji,jj,jk) ) |
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| 200 | zvf = vn(ji,jj,jk) + atfp * ( vb(ji,jj,jk) - 2.e0 * vn(ji,jj,jk) + va(ji,jj,jk) ) |
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| [1502] | 201 | ! |
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| 202 | ub(ji,jj,jk) = zuf ! ub <-- filtered velocity |
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| 203 | vb(ji,jj,jk) = zvf |
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| 204 | un(ji,jj,jk) = ua(ji,jj,jk) ! un <-- ua |
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| 205 | vn(ji,jj,jk) = va(ji,jj,jk) |
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| 206 | END DO |
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| 207 | END DO |
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| 208 | END DO |
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| [2528] | 209 | ! ! ================! |
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| 210 | ELSE ! Variable volume ! |
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| 211 | ! ! ================! |
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| 212 | ! Before scale factor at t-points |
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| 213 | ! ------------------------------- |
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| [1502] | 214 | DO jk = 1, jpkm1 |
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| [2528] | 215 | fse3t_b(:,:,jk) = fse3t_n(:,:,jk) & |
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| 216 | & + atfp * ( fse3t_b(:,:,jk) + fse3t_a(:,:,jk) & |
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| 217 | & - 2.e0 * fse3t_n(:,:,jk) ) |
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| 218 | ENDDO |
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| 219 | ! Add volume filter correction only at the first level of t-point scale factors |
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| 220 | zec = atfp * rdt / rau0 |
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| 221 | fse3t_b(:,:,1) = fse3t_b(:,:,1) - zec * ( emp_b(:,:) - emp(:,:) ) * tmask(:,:,1) |
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| 222 | ! surface at t-points and inverse surface at (u/v)-points used in surface averaging computations |
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| 223 | zs_t (:,:) = e1t(:,:) * e2t(:,:) |
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| 224 | zs_u_1(:,:) = 0.5 / e1u(:,:) * e2u(:,:) |
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| 225 | zs_v_1(:,:) = 0.5 / e1v(:,:) * e2v(:,:) |
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| 226 | ! |
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| 227 | IF( ln_dynadv_vec ) THEN |
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| 228 | ! Before scale factor at (u/v)-points |
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| 229 | ! ----------------------------------- |
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| 230 | ! Scale factor anomaly at (u/v)-points: surface averaging of scale factor at t-points |
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| 231 | DO jk = 1, jpkm1 |
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| 232 | DO jj = 1, jpjm1 |
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| 233 | DO ji = 1, jpim1 |
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| 234 | zv_t_ij = zs_t(ji ,jj ) * fse3t_b(ji ,jj ,jk) |
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| 235 | zv_t_ip1j = zs_t(ji+1,jj ) * fse3t_b(ji+1,jj ,jk) |
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| 236 | zv_t_ijp1 = zs_t(ji ,jj+1) * fse3t_b(ji ,jj+1,jk) |
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| 237 | fse3u_b(ji,jj,jk) = umask(ji,jj,jk) * ( zs_u_1(ji,jj) * ( zv_t_ij + zv_t_ip1j ) - fse3u_0(ji,jj,jk) ) |
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| 238 | fse3v_b(ji,jj,jk) = vmask(ji,jj,jk) * ( zs_v_1(ji,jj) * ( zv_t_ij + zv_t_ijp1 ) - fse3v_0(ji,jj,jk) ) |
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| 239 | END DO |
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| [592] | 240 | END DO |
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| 241 | END DO |
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| [2528] | 242 | ! lateral boundary conditions |
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| 243 | CALL lbc_lnk( fse3u_b(:,:,:), 'U', 1. ) |
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| 244 | CALL lbc_lnk( fse3v_b(:,:,:), 'V', 1. ) |
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| 245 | ! Add initial scale factor to scale factor anomaly |
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| 246 | fse3u_b(:,:,:) = fse3u_b(:,:,:) + fse3u_0(:,:,:) |
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| 247 | fse3v_b(:,:,:) = fse3v_b(:,:,:) + fse3v_0(:,:,:) |
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| 248 | ! Leap-Frog - Asselin filter and swap: applied on velocity |
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| 249 | ! ----------------------------------- |
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| 250 | DO jk = 1, jpkm1 |
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| 251 | DO jj = 1, jpj |
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| 252 | DO ji = 1, jpi |
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| 253 | zuf = un(ji,jj,jk) + atfp * ( ub(ji,jj,jk) - 2.e0 * un(ji,jj,jk) + ua(ji,jj,jk) ) |
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| 254 | zvf = vn(ji,jj,jk) + atfp * ( vb(ji,jj,jk) - 2.e0 * vn(ji,jj,jk) + va(ji,jj,jk) ) |
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| 255 | ! |
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| 256 | ub(ji,jj,jk) = zuf ! ub <-- filtered velocity |
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| 257 | vb(ji,jj,jk) = zvf |
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| 258 | un(ji,jj,jk) = ua(ji,jj,jk) ! un <-- ua |
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| 259 | vn(ji,jj,jk) = va(ji,jj,jk) |
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| 260 | END DO |
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| 261 | END DO |
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| 262 | END DO |
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| 263 | ! |
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| 264 | ELSE |
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| 265 | ! Temporary filered scale factor at (u/v)-points (will become before scale factor) |
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| 266 | !----------------------------------------------- |
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| 267 | ! Scale factor anomaly at (u/v)-points: surface averaging of scale factor at t-points |
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| 268 | DO jk = 1, jpkm1 |
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| 269 | DO jj = 1, jpjm1 |
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| 270 | DO ji = 1, jpim1 |
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| 271 | zv_t_ij = zs_t(ji ,jj ) * fse3t_b(ji ,jj ,jk) |
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| 272 | zv_t_ip1j = zs_t(ji+1,jj ) * fse3t_b(ji+1,jj ,jk) |
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| 273 | zv_t_ijp1 = zs_t(ji ,jj+1) * fse3t_b(ji ,jj+1,jk) |
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| 274 | ze3u_f(ji,jj,jk) = umask(ji,jj,jk) * ( zs_u_1(ji,jj) * ( zv_t_ij + zv_t_ip1j ) - fse3u_0(ji,jj,jk) ) |
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| 275 | ze3v_f(ji,jj,jk) = vmask(ji,jj,jk) * ( zs_v_1(ji,jj) * ( zv_t_ij + zv_t_ijp1 ) - fse3v_0(ji,jj,jk) ) |
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| 276 | END DO |
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| 277 | END DO |
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| 278 | END DO |
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| 279 | ! lateral boundary conditions |
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| 280 | CALL lbc_lnk( ze3u_f, 'U', 1. ) |
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| 281 | CALL lbc_lnk( ze3v_f, 'V', 1. ) |
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| 282 | ! Add initial scale factor to scale factor anomaly |
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| 283 | ze3u_f(:,:,:) = ze3u_f(:,:,:) + fse3u_0(:,:,:) |
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| 284 | ze3v_f(:,:,:) = ze3v_f(:,:,:) + fse3v_0(:,:,:) |
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| 285 | ! Leap-Frog - Asselin filter and swap: applied on thickness weighted velocity |
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| 286 | ! ----------------------------------- =========================== |
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| 287 | DO jk = 1, jpkm1 |
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| 288 | DO jj = 1, jpj |
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| 289 | DO ji = 1, jpim1 |
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| 290 | zue3a = ua(ji,jj,jk) * fse3u_a(ji,jj,jk) |
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| 291 | zve3a = va(ji,jj,jk) * fse3v_a(ji,jj,jk) |
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| 292 | zue3n = un(ji,jj,jk) * fse3u_n(ji,jj,jk) |
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| 293 | zve3n = vn(ji,jj,jk) * fse3v_n(ji,jj,jk) |
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| 294 | zue3b = ub(ji,jj,jk) * fse3u_b(ji,jj,jk) |
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| 295 | zve3b = vb(ji,jj,jk) * fse3v_b(ji,jj,jk) |
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| 296 | ! |
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| 297 | zuf = ( zue3n + atfp * ( zue3b - 2.e0 * zue3n + zue3a ) ) / ze3u_f(ji,jj,jk) |
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| 298 | zvf = ( zve3n + atfp * ( zve3b - 2.e0 * zve3n + zve3a ) ) / ze3v_f(ji,jj,jk) |
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| 299 | ! |
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| 300 | ub(ji,jj,jk) = zuf ! ub <-- filtered velocity |
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| 301 | vb(ji,jj,jk) = zvf |
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| 302 | un(ji,jj,jk) = ua(ji,jj,jk) ! un <-- ua |
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| 303 | vn(ji,jj,jk) = va(ji,jj,jk) |
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| 304 | END DO |
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| 305 | END DO |
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| 306 | END DO |
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| 307 | fse3u_b(:,:,:) = ze3u_f(:,:,:) ! e3u_b <-- filtered scale factor |
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| 308 | fse3v_b(:,:,:) = ze3v_f(:,:,:) |
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| 309 | CALL lbc_lnk( ub, 'U', -1. ) ! lateral boundary conditions |
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| 310 | CALL lbc_lnk( vb, 'V', -1. ) |
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| 311 | ENDIF |
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| 312 | ! |
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| [3] | 313 | ENDIF |
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| [2528] | 314 | ! |
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| [258] | 315 | ENDIF |
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| [3] | 316 | |
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| [1438] | 317 | IF(ln_ctl) CALL prt_ctl( tab3d_1=un, clinfo1=' nxt - Un: ', mask1=umask, & |
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| 318 | & tab3d_2=vn, clinfo2=' Vn: ' , mask2=vmask ) |
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| 319 | ! |
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| [2715] | 320 | IF( wrk_not_released(2, 1,2,3) ) CALL ctl_stop('dyn_nxt: failed to release workspace arrays') |
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| 321 | ! |
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| [3] | 322 | END SUBROUTINE dyn_nxt |
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| 323 | |
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| [1502] | 324 | !!========================================================================= |
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| [3] | 325 | END MODULE dynnxt |
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