| 1 | MODULE dynspg_fsc |
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| 2 | !!====================================================================== |
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| 3 | !! *** MODULE dynspg_fsc *** |
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| 4 | !! Ocean dynamics: surface pressure gradient trend |
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| 5 | !!====================================================================== |
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| 6 | #if ( defined key_dynspg_fsc && ! defined key_autotasking ) || defined key_esopa |
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| 7 | !!---------------------------------------------------------------------- |
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| 8 | !! 'key_dynspg_fsc' free surface cst volume |
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| 9 | !! NOT 'key_autotasking' k-j-i loop (vector opt.) |
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| 10 | !!---------------------------------------------------------------------- |
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| 11 | !! dyn_spg_fsc : update the momentum trend with the surface pressure |
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| 12 | !! gradient in the free surface constant volume case |
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| 13 | !! with vector optimization |
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| 14 | !!---------------------------------------------------------------------- |
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| 15 | !! * Modules used |
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| 16 | USE oce ! ocean dynamics and tracers |
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| 17 | USE dom_oce ! ocean space and time domain |
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| 18 | USE trdmod ! ocean dynamics trends |
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| 19 | USE trdmod_oce ! ocean variables trends |
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| 20 | USE zdf_oce ! ocean vertical physics |
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| 21 | USE in_out_manager ! I/O manager |
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| 22 | USE phycst ! physical constants |
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| 23 | USE ocesbc ! ocean surface boundary condition |
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| 24 | USE flxrnf ! ocean runoffs |
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| 25 | USE sol_oce ! ocean elliptic solver |
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| 26 | USE solpcg ! preconditionned conjugate gradient solver |
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| 27 | USE solsor ! Successive Over-relaxation solver |
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| 28 | USE solfet ! FETI solver |
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| 29 | USE obc_oce ! Lateral open boundary condition |
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| 30 | USE obcdyn ! ocean open boundary condition (obc_dyn routines) |
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| 31 | USE obcvol ! ocean open boundary condition (obc_vol routines) |
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| 32 | USE lib_mpp ! distributed memory computing library |
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| 33 | USE lbclnk ! ocean lateral boundary conditions (or mpp link) |
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| 34 | USE cla_dynspg ! cross land advection |
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| 35 | |
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| 36 | IMPLICIT NONE |
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| 37 | PRIVATE |
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| 38 | |
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| 39 | !! * Accessibility |
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| 40 | PUBLIC dyn_spg_fsc ! routine called by step.F90 |
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| 41 | |
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| 42 | !! * Shared module variables |
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| 43 | LOGICAL, PUBLIC, PARAMETER :: lk_dynspg_fsc = .TRUE. !: free surface constant volume flag |
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| 44 | |
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| 45 | !! * Substitutions |
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| 46 | # include "domzgr_substitute.h90" |
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| 47 | # include "vectopt_loop_substitute.h90" |
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| 48 | !!---------------------------------------------------------------------- |
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| 49 | !! OPA 9.0 , LODYC-IPSL (2003) |
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| 50 | !!---------------------------------------------------------------------- |
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| 51 | |
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| 52 | CONTAINS |
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| 53 | |
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| 54 | SUBROUTINE dyn_spg_fsc( kt, kindic ) |
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| 55 | !!---------------------------------------------------------------------- |
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| 56 | !! *** routine dyn_spg_fsc *** |
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| 57 | !! |
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| 58 | !! ** Purpose : Compute the now trend due to the surface pressure |
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| 59 | !! gradient in case of free surface formulation with a constant |
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| 60 | !! ocean volume add it to the general trend of momentum equation. |
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| 61 | !! |
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| 62 | !! ** Method : Free surface formulation. The surface pressure gradient |
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| 63 | !! is given by: |
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| 64 | !! spgu = 1/rau0 d/dx(ps) = 1/e1u di( etn + rnu btda ) |
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| 65 | !! spgv = 1/rau0 d/dy(ps) = 1/e2v dj( etn + rnu btda ) |
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| 66 | !! where etn is the free surface elevation and btda is the after |
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| 67 | !! of the free surface elevation |
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| 68 | !! -1- compute the after sea surface elevation from the cinematic |
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| 69 | !! surface boundary condition: |
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| 70 | !! zssha = sshb + 2 rdt ( wn - emp ) |
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| 71 | !! Time filter applied on now sea surface elevation to avoid |
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| 72 | !! the divergence of two consecutive time-steps and swap of free |
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| 73 | !! surface arrays to start the next time step: |
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| 74 | !! sshb = sshn + atfp * [ sshb + zssha - 2 sshn ] |
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| 75 | !! sshn = zssha |
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| 76 | !! -2- evaluate the surface presure trend (including the addi- |
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| 77 | !! tional force) in three steps: |
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| 78 | !! a- compute the right hand side of the elliptic equation: |
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| 79 | !! gcb = 1/(e1t e2t) [ di(e2u spgu) + dj(e1v spgv) ] |
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| 80 | !! where (spgu,spgv) are given by: |
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| 81 | !! spgu = vertical sum[ e3u (ub+ 2 rdt ua ) ] |
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| 82 | !! - grav 2 rdt hu /e1u di[sshn + emp] |
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| 83 | !! spgv = vertical sum[ e3v (vb+ 2 rdt va) ] |
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| 84 | !! - grav 2 rdt hv /e2v dj[sshn + emp] |
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| 85 | !! and define the first guess from previous computation : |
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| 86 | !! zbtd = btda |
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| 87 | !! btda = 2 zbtd - btdb |
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| 88 | !! btdb = zbtd |
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| 89 | !! b- compute the relative accuracy to be reached by the |
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| 90 | !! iterative solver |
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| 91 | !! c- apply the solver by a call to sol... routine |
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| 92 | !! -3- compute and add the free surface pressure gradient inclu- |
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| 93 | !! ding the additional force used to stabilize the equation. |
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| 94 | !! |
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| 95 | !! ** Action : - Update (ua,va) with the surf. pressure gradient trend |
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| 96 | !! - Save the trends in (ztdua,ztdva) ('key_trddyn') |
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| 97 | !! |
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| 98 | !! References : |
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| 99 | !! Roullet and Madec 1999, JGR. |
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| 100 | !! |
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| 101 | !! History : |
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| 102 | !! ! 98-05 (G. Roullet) Original code |
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| 103 | !! ! 98-10 (G. Madec, M. Imbard) release 8.2 |
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| 104 | !! 8.5 ! 02-08 (G. Madec) F90: Free form and module |
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| 105 | !! ! 02-11 (C. Talandier, A-M Treguier) Open boundaries |
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| 106 | !! 9.0 ! 04-08 (C. Talandier) New trends organization |
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| 107 | !!--------------------------------------------------------------------- |
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| 108 | !! * Modules used |
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| 109 | USE oce, ONLY : ztdua => ta, & ! use ta as 3D workspace |
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| 110 | ztdva => sa ! use sa as 3D workspace |
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| 111 | |
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| 112 | !! * Arguments |
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| 113 | INTEGER, INTENT( in ) :: kt ! ocean time-step index |
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| 114 | INTEGER, INTENT( out ) :: kindic ! solver convergence flag |
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| 115 | ! if the solver doesn t converge |
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| 116 | ! the flag is < 0 |
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| 117 | !! * Local declarations |
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| 118 | INTEGER :: ji, jj, jk ! dummy loop indices |
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| 119 | REAL(wp) :: & |
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| 120 | z2dt, z2dtg, zraur, znugdt, & ! temporary scalars |
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| 121 | znurau, zssha, zspgu, zspgv, & ! " " |
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| 122 | zgcb, zbtd, & ! " " |
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| 123 | ztdgu, ztdgv ! " " |
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| 124 | !!---------------------------------------------------------------------- |
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| 125 | |
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| 126 | IF( kt == nit000 ) THEN |
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| 127 | IF(lwp) WRITE(numout,*) |
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| 128 | IF(lwp) WRITE(numout,*) 'dyn_spg_fsc : surface pressure gradient trend' |
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| 129 | IF(lwp) WRITE(numout,*) '~~~~~~~~~~~ (free surface constant volume case)' |
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| 130 | |
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| 131 | ! set to zero free surface specific arrays |
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| 132 | spgu(:,:) = 0.e0 ! surface pressur gradient (i-direction) |
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| 133 | spgv(:,:) = 0.e0 ! surface pressur gradient (j-direction) |
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| 134 | ENDIF |
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| 135 | |
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| 136 | ! 0. Local constant initialization |
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| 137 | ! -------------------------------- |
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| 138 | ! time step: leap-frog |
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| 139 | z2dt = 2. * rdt |
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| 140 | ! time step: Euler if restart from rest |
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| 141 | IF( neuler == 0 .AND. kt == nit000 ) z2dt = rdt |
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| 142 | ! coefficients |
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| 143 | z2dtg = grav * z2dt |
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| 144 | zraur = 1. / rauw |
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| 145 | znugdt = rnu * grav * z2dt |
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| 146 | znurau = znugdt * zraur |
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| 147 | |
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| 148 | ! 1. Surface pressure gradient (now) |
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| 149 | ! ---------------------------- |
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| 150 | DO jj = 2, jpjm1 |
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| 151 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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| 152 | zspgu = - grav * ( sshn(ji+1,jj) - sshn(ji,jj) ) / e1u(ji,jj) |
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| 153 | zspgv = - grav * ( sshn(ji,jj+1) - sshn(ji,jj) ) / e2v(ji,jj) |
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| 154 | spgu(ji,jj) = zspgu |
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| 155 | spgv(ji,jj) = zspgv |
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| 156 | END DO |
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| 157 | END DO |
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| 158 | |
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| 159 | ! 2. Add the surface pressure trend to the general trend |
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| 160 | ! ------------------------------------------------------ |
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| 161 | DO jk = 1, jpkm1 |
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| 162 | DO jj = 2, jpjm1 |
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| 163 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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| 164 | ua(ji,jj,jk) = ua(ji,jj,jk) + spgu(ji,jj) |
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| 165 | va(ji,jj,jk) = va(ji,jj,jk) + spgv(ji,jj) |
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| 166 | END DO |
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| 167 | END DO |
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| 168 | END DO |
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| 169 | |
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| 170 | ! Save the surface pressure gradient trend for diagnostics |
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| 171 | IF( l_trddyn ) THEN |
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| 172 | DO jk = 1, jpkm1 |
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| 173 | ztdua(:,:,jk) = spgu(:,:) |
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| 174 | ztdva(:,:,jk) = spgv(:,:) |
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| 175 | END DO |
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| 176 | ENDIF |
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| 177 | |
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| 178 | ! 1. Evaluate the masked next velocity |
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| 179 | ! ------------------------------------ |
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| 180 | ! (effect of the additional force not included) |
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| 181 | DO jk = 1, jpkm1 |
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| 182 | DO jj = 2, jpjm1 |
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| 183 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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| 184 | ua(ji,jj,jk) = ( ub(ji,jj,jk) + z2dt * ua(ji,jj,jk) ) * umask(ji,jj,jk) |
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| 185 | va(ji,jj,jk) = ( vb(ji,jj,jk) + z2dt * va(ji,jj,jk) ) * vmask(ji,jj,jk) |
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| 186 | END DO |
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| 187 | END DO |
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| 188 | END DO |
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| 189 | #if defined key_obc |
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| 190 | ! Update velocities on each open boundary with the radiation algorithm |
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| 191 | CALL obc_dyn( kt ) |
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| 192 | ! Correction of the barotropic componant velocity to control the volume of the system |
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| 193 | CALL obc_vol( kt ) |
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| 194 | #endif |
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| 195 | #if defined key_orca_r2 |
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| 196 | IF( n_cla == 1 ) CALL dyn_spg_cla( kt ) ! Cross Land Advection (update (ua,va)) |
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| 197 | #endif |
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| 198 | |
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| 199 | ! 2. compute the next vertically averaged velocity |
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| 200 | ! ------------------------------------------------ |
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| 201 | ! (effect of the additional force not included) |
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| 202 | ! initialize to zero |
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| 203 | DO jj = 2, jpjm1 |
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| 204 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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| 205 | spgu(ji,jj) = 0.e0 |
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| 206 | spgv(ji,jj) = 0.e0 |
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| 207 | END DO |
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| 208 | END DO |
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| 209 | |
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| 210 | ! vertical sum |
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| 211 | !CDIR NOLOOPCHG |
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| 212 | IF( lk_vopt_loop ) THEN ! vector opt., forced unroll |
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| 213 | DO jk = 1, jpkm1 |
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| 214 | DO ji = 1, jpij |
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| 215 | spgu(ji,1) = spgu(ji,1) + fse3u(ji,1,jk) * ua(ji,1,jk) |
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| 216 | spgv(ji,1) = spgv(ji,1) + fse3v(ji,1,jk) * va(ji,1,jk) |
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| 217 | END DO |
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| 218 | END DO |
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| 219 | ELSE ! No vector opt. |
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| 220 | DO jk = 1, jpkm1 |
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| 221 | DO jj = 2, jpjm1 |
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| 222 | DO ji = 2, jpim1 |
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| 223 | spgu(ji,jj) = spgu(ji,jj) + fse3u(ji,jj,jk) * ua(ji,jj,jk) |
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| 224 | spgv(ji,jj) = spgv(ji,jj) + fse3v(ji,jj,jk) * va(ji,jj,jk) |
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| 225 | END DO |
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| 226 | END DO |
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| 227 | END DO |
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| 228 | ENDIF |
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| 229 | |
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| 230 | ! transport: multiplied by the horizontal scale factor |
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| 231 | DO jj = 2, jpjm1 |
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| 232 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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| 233 | spgu(ji,jj) = spgu(ji,jj) * e2u(ji,jj) |
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| 234 | spgv(ji,jj) = spgv(ji,jj) * e1v(ji,jj) |
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| 235 | END DO |
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| 236 | END DO |
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| 237 | |
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| 238 | ! Boundary conditions on (spgu,spgv) |
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| 239 | CALL lbc_lnk( spgu, 'U', -1. ) |
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| 240 | CALL lbc_lnk( spgv, 'V', -1. ) |
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| 241 | |
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| 242 | ! 3. Right hand side of the elliptic equation and first guess |
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| 243 | ! ----------------------------------------------------------- |
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| 244 | DO jj = 2, jpjm1 |
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| 245 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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| 246 | ! Divergence of the after vertically averaged velocity |
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| 247 | zgcb = spgu(ji,jj) - spgu(ji-1,jj) & |
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| 248 | + spgv(ji,jj) - spgv(ji,jj-1) |
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| 249 | gcb(ji,jj) = gcdprc(ji,jj) * zgcb |
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| 250 | ! First guess of the after barotropic transport divergence |
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| 251 | zbtd = gcx(ji,jj) |
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| 252 | gcx (ji,jj) = 2. * zbtd - gcxb(ji,jj) |
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| 253 | gcxb(ji,jj) = zbtd |
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| 254 | END DO |
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| 255 | END DO |
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| 256 | |
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| 257 | ! 4. Relative precision (computation on one processor) |
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| 258 | ! --------------------- |
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| 259 | rnorme =0. |
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| 260 | rnorme = SUM( gcb(:,:) * gcdmat(:,:) * gcb(:,:) ) |
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| 261 | IF( lk_mpp ) CALL mpp_sum( rnorme ) ! sum over the global domain |
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| 262 | |
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| 263 | epsr = eps * eps * rnorme |
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| 264 | ncut = 0 |
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| 265 | ! if rnorme is 0, the solution is 0, the solver isn't called |
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| 266 | IF( rnorme == 0.e0 ) THEN |
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| 267 | gcx(:,:) = 0.e0 |
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| 268 | res = 0.e0 |
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| 269 | niter = 0 |
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| 270 | ncut = 999 |
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| 271 | ENDIF |
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| 272 | |
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| 273 | ! 5. Evaluate the next transport divergence |
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| 274 | ! ----------------------------------------- |
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| 275 | ! Iterarive solver for the elliptic equation (except IF sol.=0) |
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| 276 | ! (output in gcx with boundary conditions applied) |
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| 277 | kindic = 0 |
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| 278 | IF( ncut == 0 ) THEN |
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| 279 | IF( nsolv == 1 ) THEN ! diagonal preconditioned conjuguate gradient |
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| 280 | CALL sol_pcg( kindic ) |
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| 281 | ELSEIF( nsolv == 2 ) THEN ! successive-over-relaxation |
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| 282 | CALL sol_sor( kindic ) |
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| 283 | ELSEIF( nsolv == 3 ) THEN ! FETI solver |
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| 284 | CALL sol_fet( kindic ) |
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| 285 | ELSE ! e r r o r in nsolv namelist parameter |
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| 286 | IF(lwp) WRITE(numout,cform_err) |
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| 287 | IF(lwp) WRITE(numout,*) ' dyn_spg_fsc : e r r o r, nsolv = 1, 2 or 3' |
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| 288 | IF(lwp) WRITE(numout,*) ' ~~~~~~~~~~~ not = ', nsolv |
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| 289 | nstop = nstop + 1 |
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| 290 | ENDIF |
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| 291 | ENDIF |
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| 292 | |
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| 293 | ! 6. Transport divergence gradient multiplied by z2dt |
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| 294 | ! -----------------------------------------------==== |
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| 295 | DO jj = 2, jpjm1 |
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| 296 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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| 297 | ! trend of Transport divergence gradient |
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| 298 | ztdgu = znugdt * (gcx(ji+1,jj ) - gcx(ji,jj) ) / e1u(ji,jj) |
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| 299 | ztdgv = znugdt * (gcx(ji ,jj+1) - gcx(ji,jj) ) / e2v(ji,jj) |
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| 300 | ! multiplied by z2dt |
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| 301 | #if defined key_obc |
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| 302 | ! caution : grad D = 0 along open boundaries |
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| 303 | spgu(ji,jj) = z2dt * ztdgu * obcumask(ji,jj) |
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| 304 | spgv(ji,jj) = z2dt * ztdgv * obcvmask(ji,jj) |
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| 305 | #else |
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| 306 | spgu(ji,jj) = z2dt * ztdgu |
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| 307 | spgv(ji,jj) = z2dt * ztdgv |
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| 308 | #endif |
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| 309 | END DO |
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| 310 | END DO |
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| 311 | |
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| 312 | ! 7. Add the trends multiplied by z2dt to the after velocity |
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| 313 | ! ----------------------------------------------------------- |
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| 314 | ! ( c a u t i o n : (ua,va) here are the after velocity not the |
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| 315 | ! trend, the leap-frog time stepping will not |
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| 316 | ! be done in dynnxt.F routine) |
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| 317 | DO jk = 1, jpkm1 |
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| 318 | DO jj = 2, jpjm1 |
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| 319 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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| 320 | ua(ji,jj,jk) = (ua(ji,jj,jk) + spgu(ji,jj)) * umask(ji,jj,jk) |
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| 321 | va(ji,jj,jk) = (va(ji,jj,jk) + spgv(ji,jj)) * vmask(ji,jj,jk) |
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| 322 | END DO |
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| 323 | END DO |
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| 324 | END DO |
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| 325 | |
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| 326 | ! save the surface pressure gradient trends for diagnostic |
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| 327 | ! momentum trends |
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| 328 | IF( l_trddyn ) THEN |
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| 329 | DO jk = 1, jpkm1 |
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| 330 | ztdua(:,:,jk) = ztdua(:,:,jk) + spgu(:,:)/z2dt |
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| 331 | ztdva(:,:,jk) = ztdva(:,:,jk) + spgv(:,:)/z2dt |
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| 332 | END DO |
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| 333 | |
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| 334 | CALL trd_mod(ztdua, ztdva, jpdtdspg, 'DYN', kt) |
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| 335 | ENDIF |
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| 336 | |
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| 337 | IF(l_ctl) THEN ! print sum trends (used for debugging) |
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| 338 | WRITE(numout,*) ' spg - Ua: ', SUM( ua(2:nictl,2:njctl,1:jpkm1)*umask(2:nictl,2:njctl,1:jpkm1) ), & |
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| 339 | & ' Va: ', SUM( va(2:nictl,2:njctl,1:jpkm1)*vmask(2:nictl,2:njctl,1:jpkm1) ) |
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| 340 | ENDIF |
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| 341 | |
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| 342 | |
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| 343 | ! 8. Sea surface elevation time stepping |
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| 344 | ! -------------------------------------- |
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| 345 | ! Euler (forward) time stepping, no time filter |
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| 346 | IF( neuler == 0 .AND. kt == nit000 ) THEN |
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| 347 | DO jj = 1, jpj |
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| 348 | DO ji = 1, jpi |
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| 349 | ! after free surface elevation |
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| 350 | zssha = sshb(ji,jj) + rdt * ( wn(ji,jj,1) - emp(ji,jj) * zraur ) * tmask(ji,jj,1) |
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| 351 | ! swap of arrays |
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| 352 | sshb(ji,jj) = sshn(ji,jj) |
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| 353 | sshn(ji,jj) = zssha |
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| 354 | END DO |
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| 355 | END DO |
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| 356 | ELSE |
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| 357 | ! Leap-frog time stepping and time filter |
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| 358 | DO jj = 1, jpj |
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| 359 | DO ji = 1, jpi |
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| 360 | ! after free surface elevation |
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| 361 | zssha = sshb(ji,jj) + z2dt * ( wn(ji,jj,1) - emp(ji,jj) * zraur ) * tmask(ji,jj,1) |
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| 362 | ! time filter and array swap |
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| 363 | sshb(ji,jj) = atfp * ( sshb(ji,jj) + zssha ) + atfp1 * sshn(ji,jj) |
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| 364 | sshn(ji,jj) = zssha |
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| 365 | END DO |
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| 366 | END DO |
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| 367 | ENDIF |
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| 368 | |
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| 369 | |
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| 370 | IF(l_ctl) THEN ! print sum trends (used for debugging) |
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| 371 | WRITE(numout,*) ' spg - ssh:', SUM( sshn(2:nictl,2:njctl)*tmask(2:nictl,2:njctl,1) ) |
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| 372 | ENDIF |
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| 373 | |
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| 374 | END SUBROUTINE dyn_spg_fsc |
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| 375 | |
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| 376 | #else |
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| 377 | !!---------------------------------------------------------------------- |
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| 378 | !! Default case : Empty module No standart free surface cst volume |
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| 379 | !!---------------------------------------------------------------------- |
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| 380 | LOGICAL, PUBLIC, PARAMETER :: lk_dynspg_fsc = .FALSE. !: free surface constant volume flag |
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| 381 | CONTAINS |
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| 382 | SUBROUTINE dyn_spg_fsc( kt, kindic ) ! Empty routine |
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| 383 | WRITE(*,*) 'dyn_spg_fsc: You should not have seen this print! error?', kt, kindic |
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| 384 | END SUBROUTINE dyn_spg_fsc |
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| 385 | #endif |
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| 386 | |
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| 387 | !!====================================================================== |
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| 388 | END MODULE dynspg_fsc |
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