| 1 | MODULE dynspg |
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| 2 | !!====================================================================== |
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| 3 | !! *** MODULE dynspg *** |
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| 4 | !! Ocean dynamics: surface pressure gradient control |
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| 5 | !!====================================================================== |
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| 6 | !! History : 1.0 ! 2005-12 (C. Talandier, G. Madec, V. Garnier) Original code |
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| 7 | !! 3.2 ! 2009-07 (R. Benshila) Suppression of rigid-lid option |
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| 8 | !!---------------------------------------------------------------------- |
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| 9 | |
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| 10 | !!---------------------------------------------------------------------- |
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| 11 | !! dyn_spg : update the dynamics trend with the lateral diffusion |
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| 12 | !! dyn_spg_ctl : initialization, namelist read, and parameters control |
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| 13 | !!---------------------------------------------------------------------- |
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| 14 | USE oce ! ocean dynamics and tracers variables |
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| 15 | USE dom_oce ! ocean space and time domain variables |
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| 16 | USE obc_oce ! ocean open boundary conditions |
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| 17 | USE sbc_oce ! surface boundary condition: ocean |
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| 18 | USE sbcapr ! surface boundary condition: atmospheric pressure |
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| 19 | USE dynspg_oce ! surface pressure gradient variables |
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| 20 | USE dynspg_exp ! surface pressure gradient (dyn_spg_exp routine) |
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| 21 | USE dynspg_ts ! surface pressure gradient (dyn_spg_ts routine) |
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| 22 | USE dynspg_flt ! surface pressure gradient (dyn_spg_flt routine) |
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| 23 | USE dynadv ! dynamics: vector invariant versus flux form |
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| 24 | USE trdmod ! ocean dynamics trends |
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| 25 | USE trdmod_oce ! ocean variables trends |
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| 26 | USE prtctl ! Print control (prt_ctl routine) |
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| 27 | USE in_out_manager ! I/O manager |
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| 28 | USE phycst ! physical constants |
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| 29 | |
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| 30 | IMPLICIT NONE |
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| 31 | PRIVATE |
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| 32 | |
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| 33 | PUBLIC dyn_spg ! routine called by step module |
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| 34 | PUBLIC dyn_spg_init ! routine called by opa module |
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| 35 | |
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| 36 | INTEGER :: nspg = 0 ! type of surface pressure gradient scheme defined from lk_dynspg_... |
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| 37 | |
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| 38 | !! * Substitutions |
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| 39 | # include "domzgr_substitute.h90" |
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| 40 | # include "vectopt_loop_substitute.h90" |
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| 41 | !!---------------------------------------------------------------------- |
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| 42 | !! NEMO/OPA 3.2 , LODYC-IPSL (2009) |
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| 43 | !! $Id$ |
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| 44 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
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| 45 | !!---------------------------------------------------------------------- |
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| 46 | |
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| 47 | CONTAINS |
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| 48 | |
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| 49 | SUBROUTINE dyn_spg( kt, kindic ) |
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| 50 | !!---------------------------------------------------------------------- |
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| 51 | !! *** ROUTINE dyn_spg *** |
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| 52 | !! |
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| 53 | !! ** Purpose : achieve the momentum time stepping by computing the |
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| 54 | !! last trend, the surface pressure gradient including the |
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| 55 | !! atmospheric pressure forcing (ln_apr_dyn=T), and performing |
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| 56 | !! the Leap-Frog integration. |
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| 57 | !!gm In the current version only the filtered solution provide |
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| 58 | !!gm the after velocity, in the 2 other (ua,va) are still the trends |
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| 59 | !! |
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| 60 | !! ** Method : Three schemes: |
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| 61 | !! - explicit computation : the spg is evaluated at now |
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| 62 | !! - filtered computation : the Roulet & madec (2000) technique is used |
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| 63 | !! - split-explicit computation: a time splitting technique is used |
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| 64 | !! |
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| 65 | !! ln_apr_dyn=T : the atmospheric pressure forcing is applied |
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| 66 | !! as the gradient of the inverse barometer ssh: |
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| 67 | !! apgu = - 1/rau0 di[apr] = 0.5*grav di[ssh_ib+ssh_ibb] |
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| 68 | !! apgv = - 1/rau0 dj[apr] = 0.5*grav dj[ssh_ib+ssh_ibb] |
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| 69 | !! Note that as all external forcing a time averaging over a two rdt |
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| 70 | !! period is used to prevent the divergence of odd and even time step. |
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| 71 | !! |
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| 72 | !! N.B. : When key_esopa is used all the scheme are tested, regardless |
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| 73 | !! of the physical meaning of the results. |
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| 74 | !!---------------------------------------------------------------------- |
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| 75 | INTEGER, INTENT(in ) :: kt ! ocean time-step index |
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| 76 | INTEGER, INTENT( out) :: kindic ! solver flag |
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| 77 | !! |
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| 78 | REAL(wp) :: z2dt ! temporary scalar |
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| 79 | INTEGER :: ji, jj, jk ! dummy loop indices |
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| 80 | REAL(wp) :: z2dt, zg_2 ! temporary scalar |
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| 81 | REAL(wp), DIMENSION(jpi,jpj,jpk) :: ztrdu, ztrdv ! 3D workspace |
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| 82 | !!---------------------------------------------------------------------- |
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| 83 | |
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| 84 | |
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| 85 | !!gm NOTA BENE : the dynspg_exp and dynspg_ts should be modified so that |
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| 86 | !!gm they return the after velocity, not the trends (as in trazdf_imp...) |
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| 87 | !!gm In this case, change/simplify dynnxt |
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| 88 | |
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| 89 | |
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| 90 | |
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| 91 | IF( l_trddyn ) THEN ! temporary save of ta and sa trends |
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| 92 | ztrdu(:,:,:) = ua(:,:,:) |
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| 93 | ztrdv(:,:,:) = va(:,:,:) |
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| 94 | ENDIF |
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| 95 | |
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| 96 | IF( ln_apr_dyn ) THEN !== Atmospheric pressure gradient ==! |
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| 97 | zg_2 = grav * 0.5 |
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| 98 | DO jj = 2, jpjm1 ! gradient of Patm using inverse barometer ssh |
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| 99 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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| 100 | spgu(ji,jj) = zg_2 * ( ssh_ib (ji+1,jj) - ssh_ib (ji,jj) & |
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| 101 | & + ssh_ibb(ji+1,jj) - ssh_ibb(ji,jj) ) /e1u(ji,jj) |
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| 102 | spgv(ji,jj) = zg_2 * ( ssh_ib (ji,jj+1) - ssh_ib (ji,jj) & |
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| 103 | & + ssh_ibb(ji,jj+1) - ssh_ib (ji,jj) ) /e2v(ji,jj) |
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| 104 | END DO |
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| 105 | END DO |
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| 106 | DO jk = 1, jpkm1 ! Add the apg to the general trend |
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| 107 | DO jj = 2, jpjm1 |
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| 108 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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| 109 | ua(ji,jj,jk) = ua(ji,jj,jk) + spgu(ji,jj) |
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| 110 | va(ji,jj,jk) = va(ji,jj,jk) + spgv(ji,jj) |
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| 111 | END DO |
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| 112 | END DO |
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| 113 | END DO |
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| 114 | ENDIF |
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| 115 | |
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| 116 | |
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| 117 | SELECT CASE ( nspg ) ! compute surf. pressure gradient trend and add it to the general trend |
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| 118 | ! |
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| 119 | CASE ( 0 ) ; CALL dyn_spg_exp( kt ) ! explicit |
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| 120 | CASE ( 1 ) ; CALL dyn_spg_ts ( kt ) ! time-splitting |
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| 121 | CASE ( 2 ) ; CALL dyn_spg_flt( kt, kindic ) ! filtered |
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| 122 | ! |
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| 123 | CASE ( -1 ) ! esopa: test all possibility with control print |
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| 124 | CALL dyn_spg_exp( kt ) |
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| 125 | CALL prt_ctl( tab3d_1=ua, clinfo1=' spg0 - Ua: ', mask1=umask, & |
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| 126 | & tab3d_2=va, clinfo2= ' Va: ', mask2=vmask, clinfo3='dyn' ) |
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| 127 | CALL dyn_spg_ts ( kt ) |
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| 128 | CALL prt_ctl( tab3d_1=ua, clinfo1=' spg1 - Ua: ', mask1=umask, & |
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| 129 | & tab3d_2=va, clinfo2= ' Va: ', mask2=vmask, clinfo3='dyn' ) |
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| 130 | CALL dyn_spg_flt( kt, kindic ) |
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| 131 | CALL prt_ctl( tab3d_1=ua, clinfo1=' spg2 - Ua: ', mask1=umask, & |
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| 132 | & tab3d_2=va, clinfo2= ' Va: ', mask2=vmask, clinfo3='dyn' ) |
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| 133 | END SELECT |
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| 134 | ! |
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| 135 | IF( l_trddyn ) THEN ! save the surface pressure gradient trends for further diagnostics |
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| 136 | SELECT CASE ( nspg ) |
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| 137 | CASE ( 0, 1 ) |
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| 138 | ztrdu(:,:,:) = ua(:,:,:) - ztrdu(:,:,:) |
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| 139 | ztrdv(:,:,:) = va(:,:,:) - ztrdv(:,:,:) |
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| 140 | CASE( 2 ) |
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| 141 | z2dt = 2. * rdt |
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| 142 | IF( neuler == 0 .AND. kt == nit000 ) z2dt = rdt |
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| 143 | ztrdu(:,:,:) = ( ua(:,:,:) - ub(:,:,:) ) / z2dt - ztrdu(:,:,:) |
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| 144 | ztrdv(:,:,:) = ( va(:,:,:) - vb(:,:,:) ) / z2dt - ztrdv(:,:,:) |
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| 145 | END SELECT |
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| 146 | CALL trd_mod( ztrdu, ztrdv, jpdyn_trd_spg, 'DYN', kt ) |
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| 147 | ENDIF |
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| 148 | ! ! print mean trends (used for debugging) |
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| 149 | IF(ln_ctl) CALL prt_ctl( tab3d_1=ua, clinfo1=' spg - Ua: ', mask1=umask, & |
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| 150 | & tab3d_2=va, clinfo2= ' Va: ', mask2=vmask, clinfo3='dyn' ) |
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| 151 | ! |
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| 152 | END SUBROUTINE dyn_spg |
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| 153 | |
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| 154 | |
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| 155 | SUBROUTINE dyn_spg_init |
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| 156 | !!--------------------------------------------------------------------- |
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| 157 | !! *** ROUTINE dyn_spg_init *** |
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| 158 | !! |
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| 159 | !! ** Purpose : Control the consistency between cpp options for |
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| 160 | !! surface pressure gradient schemes |
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| 161 | !!---------------------------------------------------------------------- |
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| 162 | INTEGER :: ioptio |
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| 163 | !!---------------------------------------------------------------------- |
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| 164 | |
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| 165 | IF(lwp) THEN ! Control print |
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| 166 | WRITE(numout,*) |
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| 167 | WRITE(numout,*) 'dyn_spg_init : choice of the surface pressure gradient scheme' |
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| 168 | WRITE(numout,*) '~~~~~~~~~~~' |
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| 169 | WRITE(numout,*) ' Explicit free surface lk_dynspg_exp = ', lk_dynspg_exp |
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| 170 | WRITE(numout,*) ' Free surface with time splitting lk_dynspg_ts = ', lk_dynspg_ts |
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| 171 | WRITE(numout,*) ' Filtered free surface cst volume lk_dynspg_flt = ', lk_dynspg_flt |
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| 172 | ENDIF |
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| 173 | |
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| 174 | ! ! Control of surface pressure gradient scheme options |
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| 175 | ioptio = 0 |
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| 176 | IF(lk_dynspg_exp) ioptio = ioptio + 1 |
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| 177 | IF(lk_dynspg_ts ) ioptio = ioptio + 1 |
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| 178 | IF(lk_dynspg_flt) ioptio = ioptio + 1 |
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| 179 | ! |
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| 180 | IF( ( ioptio > 1 .AND. .NOT. lk_esopa ) .OR. ioptio == 0 ) & |
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| 181 | & CALL ctl_stop( ' Choose only one surface pressure gradient scheme with a key cpp' ) |
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| 182 | ! |
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| 183 | IF( lk_esopa ) nspg = -1 |
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| 184 | IF( lk_dynspg_exp) nspg = 0 |
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| 185 | IF( lk_dynspg_ts ) nspg = 1 |
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| 186 | IF( lk_dynspg_flt) nspg = 2 |
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| 187 | ! |
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| 188 | IF( lk_esopa ) nspg = -1 |
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| 189 | ! |
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| 190 | IF(lwp) THEN |
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| 191 | WRITE(numout,*) |
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| 192 | IF( nspg == -1 ) WRITE(numout,*) ' ESOPA test All scheme used' |
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| 193 | IF( nspg == 0 ) WRITE(numout,*) ' explicit free surface' |
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| 194 | IF( nspg == 1 ) WRITE(numout,*) ' free surface with time splitting scheme' |
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| 195 | IF( nspg == 2 ) WRITE(numout,*) ' filtered free surface' |
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| 196 | ENDIF |
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| 197 | |
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| 198 | ! ! Control of timestep choice |
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| 199 | IF( lk_dynspg_ts .OR. lk_dynspg_exp ) THEN |
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| 200 | IF( nn_cla == 1 ) CALL ctl_stop( 'Crossland advection not implemented for this free surface formulation' ) |
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| 201 | ENDIF |
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| 202 | |
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| 203 | ! ! Control of momentum formulation |
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| 204 | IF( lk_dynspg_ts .AND. lk_vvl ) THEN |
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| 205 | IF( .NOT.ln_dynadv_vec ) CALL ctl_stop( 'Flux form not implemented for this free surface formulation' ) |
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| 206 | ENDIF |
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| 207 | |
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| 208 | #if defined key_obc |
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| 209 | ! ! Conservation of ocean volume (key_dynspg_flt) |
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| 210 | IF( lk_dynspg_flt ) ln_vol_cst = .true. |
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| 211 | |
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| 212 | ! ! Application of Flather's algorithm at open boundaries |
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| 213 | IF( lk_dynspg_flt ) ln_obc_fla = .false. |
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| 214 | IF( lk_dynspg_exp ) ln_obc_fla = .true. |
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| 215 | IF( lk_dynspg_ts ) ln_obc_fla = .true. |
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| 216 | #endif |
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| 217 | ! |
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| 218 | END SUBROUTINE dyn_spg_init |
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| 219 | |
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| 220 | !!====================================================================== |
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| 221 | END MODULE dynspg |
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