| 1 | MODULE obcspg |
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| 2 | !!====================================================================== |
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| 3 | !! *** MODULE obcspg *** |
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| 4 | !! Open Boundaries : Radiation of barotropic stream function on each |
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| 5 | !! open boundary |
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| 6 | !!====================================================================== |
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| 7 | #if defined key_obc && defined key_dynspg_rl |
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| 8 | !!---------------------------------------------------------------------- |
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| 9 | !! 'key_obc' and Open Boundary Condition |
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| 10 | !! 'key_dynspg_rl' Rigid-Lid |
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| 11 | !!---------------------------------------------------------------------- |
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| 12 | !! obc_spg : call the subroutine for each open boundary |
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| 13 | !! obc_spg_east : radiation of the east open boundary streamfunction |
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| 14 | !! obc_spg_west : radiation of the west open boundary streamfunction |
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| 15 | !! obc_spg_north : radiation of the north open boundary streamfunction |
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| 16 | !! obc_spg_south : radiation of the south open boundary streamfunction |
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| 17 | !!---------------------------------------------------------------------- |
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| 18 | !! * Modules used |
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| 19 | USE oce ! ocean dynamics and tracers variables |
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| 20 | USE dom_oce ! ocean space and time domain variables |
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| 21 | USE lbclnk ! ocean lateral boundary conditions (or mpp link) |
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| 22 | USE phycst ! physical constants |
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| 23 | USE obc_oce ! ocean open boundary conditions |
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| 24 | USE lib_mpp ! for mppobc |
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| 25 | USE in_out_manager ! I/O manager |
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| 26 | |
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| 27 | IMPLICIT NONE |
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| 28 | PRIVATE |
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| 29 | |
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| 30 | !! * Accessibility |
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| 31 | PUBLIC obc_spg ! routine called in step.F90 (rigid lid case) |
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| 32 | |
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| 33 | !! * Module variables |
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| 34 | INTEGER :: ji, jj, jk, jnic ! dummy loop indices |
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| 35 | |
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| 36 | INTEGER :: & ! ... boundary space indices |
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| 37 | nib = 1, & ! nib = boundary point |
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| 38 | nibm = 2, & ! nibm = 1st interior point |
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| 39 | nibm2 = 3, & ! nibm2 = 2nd interior point |
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| 40 | ! ! ... boundary time indices |
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| 41 | nit = 1, & ! nit = now |
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| 42 | nitm = 2, & ! nitm = before |
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| 43 | nitm2 = 3 ! nitm2 = before-before |
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| 44 | |
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| 45 | REAL(wp) :: rtaue , rtauw , rtaun , rtaus , & ! |
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| 46 | rtauein, rtauwin, rtaunin, rtausin ! |
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| 47 | |
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| 48 | !! * Substitutions |
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| 49 | # include "obc_vectopt_loop_substitute.h90" |
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| 50 | !!---------------------------------------------------------------------- |
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| 51 | !! OPA 9.0 , LODYC-IPSL (2003) |
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| 52 | !!---------------------------------------------------------------------- |
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| 53 | |
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| 54 | CONTAINS |
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| 55 | |
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| 56 | SUBROUTINE obc_spg ( kt ) |
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| 57 | !!---------------------------------------------------------------------- |
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| 58 | !! *** ROUTINE obc_spg *** |
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| 59 | !! |
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| 60 | !! ** Purpose : |
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| 61 | !! Compute now barotropic stream function at the open boundaries. |
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| 62 | !! (lp_obc_east, and/or lp_obc_west, and/or lp_obc_north, and/or lp_obc_south). |
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| 63 | !! Deduce the correct bsf trend on the open boundaries and isolated |
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| 64 | !! coastlines previous to the call to the barotropic solver. |
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| 65 | !! |
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| 66 | !! ** Method : |
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| 67 | !! In case of open boundaries, there can be a net barotropic flow |
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| 68 | !! through the boundaries, hence the potential on the coastlines |
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| 69 | !! on each side of the OBC is different. |
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| 70 | !! This routine: |
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| 71 | !! 1. compute the contribution of the isolated coastlines to the |
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| 72 | !! rhs of the barotropic equation |
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| 73 | !! 2. compute the contribution of the OBC to the rhs of the |
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| 74 | !! barotropic equation using a radiation equation as explained |
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| 75 | !! in the OBC routine. |
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| 76 | !! |
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| 77 | !! Reference : |
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| 78 | !! Marchesiello P., 1995, these de l'universite J. Fourier, Grenoble, France. |
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| 79 | !! History : |
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| 80 | !! ! 95-03 (J.-M. Molines) Original, SPEM |
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| 81 | !! ! 97-07 (G. Madec, J.-M. Molines) additions |
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| 82 | !! 8.5 ! 02-10 (C. Talandier, A-M. Treguier) F90 |
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| 83 | !!---------------------------------------------------------------------- |
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| 84 | !! * Arguments |
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| 85 | INTEGER, INTENT( in ) :: kt |
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| 86 | !!---------------------------------------------------------------------- |
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| 87 | |
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| 88 | IF( kt == nit000 .OR. ln_rstart ) THEN ! Initialization |
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| 89 | ! ... Boundary restoring coefficient |
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| 90 | rtaue = 2. * rdt / rdpeob |
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| 91 | rtauw = 2. * rdt / rdpwob |
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| 92 | rtaun = 2. * rdt / rdpnob |
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| 93 | rtaus = 2. * rdt / rdpsob |
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| 94 | ! ... Boundary restoring coefficient for inflow ( all boundaries) |
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| 95 | rtauein = 2. * rdt / rdpein |
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| 96 | rtauwin = 2. * rdt / rdpwin |
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| 97 | rtaunin = 2. * rdt / rdpnin |
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| 98 | rtausin = 2. * rdt / rdpsin |
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| 99 | ENDIF |
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| 100 | |
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| 101 | ! right hand side of the barotropic elliptic equation |
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| 102 | ! --------------------------------------------------- |
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| 103 | |
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| 104 | ! Isolated coastline contribution to the RHS of the barotropic Eq. |
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| 105 | gcbob(:,:) = 0.e0 |
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| 106 | DO jnic = 1, nbobc-1 |
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| 107 | gcbob(:,:) = gcbob(:,:) + gcfobc(:,:,jnic) * gcbic(jnic) |
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| 108 | END DO |
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| 109 | |
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| 110 | IF( lp_obc_east ) CALL obc_spg_east ( kt ) ! East open boundary |
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| 111 | |
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| 112 | IF( lp_obc_west ) CALL obc_spg_west ( kt ) ! West open boundary |
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| 113 | |
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| 114 | IF( lp_obc_north ) CALL obc_spg_north( kt ) ! North open boundary |
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| 115 | |
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| 116 | IF( lp_obc_south ) CALL obc_spg_south( kt ) ! South open boundary |
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| 117 | |
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| 118 | IF( lk_mpp ) CALL lbc_lnk( gcbob, 'G', 1. ) |
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| 119 | |
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| 120 | END SUBROUTINE obc_spg |
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| 121 | |
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| 122 | |
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| 123 | SUBROUTINE obc_spg_east ( kt ) |
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| 124 | !!------------------------------------------------------------------------------ |
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| 125 | !! *** SUBROUTINE obc_spg_east *** |
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| 126 | !! |
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| 127 | !! ** Purpose : Apply the radiation algorithm on east OBC stream function. |
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| 128 | !! If lfbceast=T , there is no radiation but only fixed OBC |
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| 129 | !! |
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| 130 | !! History : |
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| 131 | !! ! 95-03 (J.-M. Molines) Original from SPEM |
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| 132 | !! ! 97-07 (G. Madec, J.-M. Molines) additions |
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| 133 | !! ! 97-12 (M. Imbard) Mpp adaptation |
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| 134 | !! ! 00-06 (J.-M. Molines) |
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| 135 | !! 8.5 ! 02-10 (C. Talandier, A-M Treguier) F90 |
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| 136 | !!------------------------------------------------------------------------------ |
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| 137 | !! * Arguments |
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| 138 | INTEGER, INTENT( in ) :: kt |
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| 139 | |
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| 140 | !! * Local declarations |
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| 141 | INTEGER :: ij |
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| 142 | REAL(wp) :: z2dtr, ztau, zin |
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| 143 | REAL(wp) :: z05cx, zdt, z4nor2, z2dx, z2dy |
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| 144 | !!------------------------------------------------------------------------------ |
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| 145 | |
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| 146 | ! 1. First three time steps and more if lfbceast is .TRUE. |
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| 147 | ! In that case open boundary conditions are FIXED. |
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| 148 | ! -------------------------------------------------------- |
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| 149 | |
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| 150 | IF( ( kt < nit000 + 3 .AND. .NOT.ln_rstart) .OR. lfbceast ) THEN |
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| 151 | |
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| 152 | ! 1.1 Fixed barotropic stream function |
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| 153 | ! ------------------------------------ |
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| 154 | DO jj = nje0m1, nje1 |
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| 155 | ij = jj -1 + njmpp |
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| 156 | bsfeob(jj)=bfoe(ij) |
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| 157 | END DO |
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| 158 | |
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| 159 | ELSE |
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| 160 | |
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| 161 | ! 2. Beyond the fourth time step if lfbceast is .FALSE. |
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| 162 | ! ----------------------------------------------------- |
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| 163 | |
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| 164 | ! 2.1. Barotropic stream function radiation |
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| 165 | ! ---------------------------------------- |
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| 166 | ! |
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| 167 | ! nibm2 nibm nib |
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| 168 | ! | nibm | nib |/// |
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| 169 | ! | | | | |/// |
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| 170 | ! jj-line --f----v----f----v----f--- |
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| 171 | ! | | |/// |
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| 172 | ! | | | | |/// |
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| 173 | ! jpieob-2 jpieob-1 jpieob |
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| 174 | ! | | |
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| 175 | ! jpieob-1 jpieob |
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| 176 | ! |
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| 177 | ! ... radiative conditions plus restoring term toward climatology |
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| 178 | ! ... Initialize bsfeob to clim in any case, at the first step |
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| 179 | ! to ensure proper values at the ends of the open line. |
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| 180 | ! ... Take care that the j indices starts at nje0 (jpjed) and finish |
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| 181 | ! at nje1 (jpjef) to be sure that jpjefm1 and jpjef are set OK. |
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| 182 | DO ji = fs_nie0-1, fs_nie1-1 ! Vector opt. |
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| 183 | DO jj = nje0p1, nje1m2 |
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| 184 | ij = jj -1 + njmpp |
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| 185 | ! ... 2* gradi(bsf) (v-point i=nibm, time mean) |
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| 186 | z2dx = ( bebnd(jj,nibm ,nit) + bebnd(jj,nibm ,nitm2) - 2.*bebnd(jj,nibm2,nitm) ) & |
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| 187 | / e1v(ji,jj) |
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| 188 | ! ... 2* gradj(bsf) (f-point i=nibm, time nitm) |
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| 189 | z2dy = ( bebnd(jj+1,nibm,nitm) - bebnd(jj-1,nibm,nitm) ) / e2f(ji,jj) |
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| 190 | ! ... square of the norm of grad(bsf) |
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| 191 | z4nor2 = z2dx * z2dx + z2dy * z2dy |
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| 192 | ! ... minus time derivative (leap-frog) at nibm, without / 2 dt |
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| 193 | zdt = bebnd(jj,nibm,nitm2) - bebnd(jj,nibm,nit) |
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| 194 | ! ... i-phase speed ratio (bounded by 1) and MASKED! |
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| 195 | IF( z4nor2 == 0 ) THEN |
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| 196 | IF(lwp) WRITE(numout,*)' PB dans obc_spg_east au pt ',jj,' : z4nor=0' |
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| 197 | z4nor2 = 0.001 |
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| 198 | ENDIF |
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| 199 | z05cx = zdt * z2dx / z4nor2 * bmask(ji,jj) |
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| 200 | z05cx = z05cx / e1v(ji+1,jj) |
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| 201 | z05cx = min( z05cx, 1. ) |
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| 202 | ! ... z05cx < 0, inflow zin=0, ztau=1 |
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| 203 | ! => 0, outflow zin=1, ztau=rtaue |
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| 204 | zin = sign( 1., z05cx ) |
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| 205 | zin = 0.5*( zin + abs(zin) ) |
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| 206 | ! ... Modification JM: We maintain a restoring term toward |
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| 207 | ! bsfb even in case of inflow |
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| 208 | ! But restoring is stronger when in flow (10 days) (ztau in set in obcspg.F) |
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| 209 | ztau = (1.-zin ) * rtauein + zin * rtaue |
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| 210 | z05cx = z05cx * zin |
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| 211 | ! ... update bsfn with radiative or climatological bsf (not mask!) |
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| 212 | bsfeob(jj) = ( ( 1. - z05cx - ztau ) * bebnd(jj,nib ,nitm) + 2.*z05cx & |
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| 213 | * bebnd(jj,nibm,nit) + ztau * bfoe (ij) ) & |
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| 214 | / (1. + z05cx) |
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| 215 | END DO |
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| 216 | END DO |
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| 217 | |
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| 218 | ENDIF |
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| 219 | IF( lk_mpp ) CALL mppobc(bsfeob,jpjed,jpjef,jpieob-1,1,2,jpj) |
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| 220 | |
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| 221 | |
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| 222 | ! 3. right hand side of the barotropic elliptic equation |
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| 223 | ! ------------------------------------------------------ |
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| 224 | |
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| 225 | IF( ( neuler == 0 ) .AND. ( kt == nit000 ) ) THEN |
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| 226 | z2dtr = 1.0 / rdt |
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| 227 | ELSE |
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| 228 | z2dtr = 0.5 / rdt |
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| 229 | ENDIF |
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| 230 | DO ji = fs_nie0-1, fs_nie1-1 ! Vector opt. |
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| 231 | DO jj = nje0m1, nje1 |
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| 232 | gcbob(ji,jj) = gcbob(ji,jj) - hvr(ji+1,jj) * e2v(ji+1,jj) / e1v(ji+1,jj) & |
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| 233 | * ( bsfeob(jj) - bsfb(ji+1,jj) ) * z2dtr * bmask(ji,jj) |
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| 234 | END DO |
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| 235 | END DO |
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| 236 | |
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| 237 | END SUBROUTINE obc_spg_east |
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| 238 | |
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| 239 | SUBROUTINE obc_spg_west ( kt ) |
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| 240 | !!------------------------------------------------------------------------------ |
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| 241 | !! *** SUBROUTINE obc_spg_west *** |
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| 242 | !! |
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| 243 | !! ** Purpose : |
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| 244 | !! Apply the radiation algorithm on west OBC stream function. |
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| 245 | !! If the logical lfbcwest is .TRUE., there is no radiation but only fixed OBC |
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| 246 | !! |
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| 247 | !! History : |
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| 248 | !! ! 95-03 (J.-M. Molines) Original from SPEM |
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| 249 | !! ! 97-07 (G. Madec, J.-M. Molines) additions |
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| 250 | !! ! 97-12 (M. Imbard) Mpp adaptation |
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| 251 | !! ! 00-06 (J.-M. Molines) |
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| 252 | !! 8.5 ! 02-10 (C. Talandier, A-M Treguier) F90 |
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| 253 | !!------------------------------------------------------------------------------ |
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| 254 | !! * Arguments |
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| 255 | INTEGER, INTENT( in ) :: kt |
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| 256 | |
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| 257 | !! * Local declarations |
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| 258 | INTEGER :: ij |
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| 259 | |
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| 260 | REAL(wp) :: z2dtr, ztau, zin |
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| 261 | REAL(wp) :: z05cx, zdt, z4nor2, z2dx, z2dy |
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| 262 | |
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| 263 | !!------------------------------------------------------------------------------ |
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| 264 | !! OPA 8.5, LODYC-IPSL (2002) |
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| 265 | !!------------------------------------------------------------------------------ |
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| 266 | |
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| 267 | ! 1. First three time steps and more if lfbcwest is .TRUE. |
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| 268 | ! In that case open boundary conditions are FIXED. |
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| 269 | ! -------------------------------------------------------- |
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| 270 | |
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| 271 | IF( ( kt < nit000 + 3 .AND. .NOT.ln_rstart ) .OR. lfbcwest ) THEN |
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| 272 | |
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| 273 | ! 1.1 Fixed barotropic stream function |
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| 274 | ! ------------------------------------ |
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| 275 | DO jj = njw0m1, njw1 |
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| 276 | ij = jj -1 + njmpp |
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| 277 | bsfwob(jj)=bfow(ij) |
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| 278 | END DO |
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| 279 | |
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| 280 | ELSE |
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| 281 | |
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| 282 | ! 2. Beyond the fourth time step if lfbcwest is .FALSE. |
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| 283 | ! ----------------------------------------------------- |
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| 284 | |
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| 285 | ! 2.1. Barotropic stream function radiation |
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| 286 | ! ---------------------------------------- |
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| 287 | ! |
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| 288 | ! nib nibm nibm2 |
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| 289 | ! ///| nib | nibm | |
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| 290 | ! ///| | | | | |
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| 291 | ! ---f----v----f----v----f-- jj-line |
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| 292 | ! ///| | | |
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| 293 | ! ///| | | | | |
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| 294 | ! jpiwob jpiwob+1 jpiwob+2 |
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| 295 | ! | | |
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| 296 | ! jpiwob+1 jpiwob+2 |
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| 297 | ! |
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| 298 | ! ... radiative conditions plus restoring term toward climatology |
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| 299 | ! ... Initialize bsfwob to clim in any case, at the first step |
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| 300 | ! to ensure proper values at the ends of the open line. |
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| 301 | ! ... Take care that the j indices starts at njw0 (jpjwd) and finish |
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| 302 | ! ... at njw1 (jpjwf) to be sure that jpjwfm1 and jpjwf are set OK. |
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| 303 | DO ji = fs_niw0+1, fs_niw1+1 ! Vector opt. |
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| 304 | DO jj = njw0p1, njw1m2 |
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| 305 | ij = jj -1 + njmpp |
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| 306 | ! ... 2* gradi(bsf) (v-point i=nibm, time mean) |
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| 307 | z2dx = ( - bwbnd(jj,nibm ,nit ) - bwbnd(jj,nibm ,nitm2) + 2.*bwbnd(jj,nibm2,nitm ) ) & |
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| 308 | / e1v(ji+1,jj) |
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| 309 | ! ... 2* gradj(bsf) (f-point i=nibm, time nitm) |
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| 310 | z2dy = ( bwbnd(jj+1,nibm,nitm) - bwbnd(jj-1,nibm,nitm) ) / e2f(ji,jj) |
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| 311 | ! ... square of the norm of grad(bsf) |
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| 312 | z4nor2 = z2dx * z2dx + z2dy * z2dy |
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| 313 | ! ... minus time derivative (leap-frog) at nibm, without / 2 dt |
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| 314 | zdt = bwbnd(jj,nibm,nitm2) - bwbnd(jj,nibm,nit) |
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| 315 | ! ... i-phase speed ratio (bounded by 1) and MASKED! |
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| 316 | IF( z4nor2 == 0 ) THEN |
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| 317 | IF(lwp) WRITE(numout,*)' PB dans obc_spg_west au pt ',jj,' : z4nor =0' |
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| 318 | z4nor2=0.0001 |
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| 319 | ENDIF |
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| 320 | z05cx = zdt * z2dx / z4nor2 * bmask(ji,jj) |
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| 321 | z05cx = z05cx / e1v(ji,jj) |
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| 322 | z05cx = max( z05cx, -1. ) |
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| 323 | ! ... z05cx => 0, inflow zin=0, ztau=1 |
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| 324 | ! < 0, outflow zin=1, ztau=rtauw |
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| 325 | zin = sign( 1., -1. * z05cx ) |
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| 326 | zin = 0.5*( zin + abs(zin) ) |
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| 327 | ztau = (1.-zin )*rtauwin + zin * rtauw |
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| 328 | z05cx = z05cx * zin |
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| 329 | ! ... update bsfn with radiative or climatological bsf (not mask!) |
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| 330 | bsfwob(jj) = ( ( 1. + z05cx - ztau ) * bwbnd(jj,nib ,nitm) - 2.*z05cx & |
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| 331 | * bwbnd(jj,nibm,nit) + ztau * bfow (ij) ) & |
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| 332 | / (1. - z05cx) |
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| 333 | END DO |
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| 334 | END DO |
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| 335 | |
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| 336 | ENDIF |
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| 337 | IF( lk_mpp ) CALL mppobc(bsfwob,jpjwd,jpjwf,jpiwob+1,1,2,jpj) |
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| 338 | |
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| 339 | |
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| 340 | ! 3. right hand side of the barotropic elliptic equation |
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| 341 | ! ------------------------------------------------------- |
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| 342 | |
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| 343 | IF( ( neuler == 0 ) .AND. ( kt == nit000 ) ) THEN |
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| 344 | z2dtr = 1.0 / rdt |
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| 345 | ELSE |
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| 346 | z2dtr = 0.5 / rdt |
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| 347 | ENDIF |
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| 348 | DO ji = fs_niw0+1, fs_niw1+1 ! Vector opt. |
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| 349 | DO jj = njw0m1, njw1 |
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| 350 | gcbob(ji,jj) = gcbob(ji,jj) - hvr(ji,jj) * e2v(ji,jj) / e1v(ji,jj) & |
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| 351 | * ( bsfwob(jj) - bsfb(ji-1,jj) ) * z2dtr * bmask(ji,jj) |
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| 352 | END DO |
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| 353 | END DO |
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| 354 | |
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| 355 | END SUBROUTINE obc_spg_west |
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| 356 | |
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| 357 | SUBROUTINE obc_spg_north ( kt ) |
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| 358 | !!------------------------------------------------------------------------------ |
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| 359 | !! *** SUBROUTINE obc_spg_north *** |
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| 360 | !! |
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| 361 | !! ** Purpose : Apply the radiation algorithm on north OBC stream function. |
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| 362 | !! If lfbcnorth=T, there is no radiation but only fixed OBC |
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| 363 | !! |
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| 364 | !! History : |
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| 365 | !! ! 95-03 (J.-M. Molines) Original from SPEM |
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| 366 | !! ! 97-07 (G. Madec, J.-M. Molines) additions |
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| 367 | !! ! 97-12 (M. Imbard) Mpp adaptation |
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| 368 | !! ! 00-06 (J.-M. Molines) |
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| 369 | !! 8.5 ! 02-10 (C. Talandier, A-M Treguier) F90 |
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| 370 | !!------------------------------------------------------------------------------ |
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| 371 | !! * Arguments |
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| 372 | INTEGER, INTENT( in ) :: kt |
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| 373 | |
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| 374 | !! * Local declarations |
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| 375 | INTEGER :: ii |
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| 376 | REAL(wp) :: z2dtr, ztau, zin |
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| 377 | REAL(wp) :: z05cx, zdt, z4nor2, z2dx, z2dy |
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| 378 | !!------------------------------------------------------------------------------ |
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| 379 | |
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| 380 | ! 1. First three time steps and more if lfbcnorth is .TRUE. |
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| 381 | ! In that case open boundary conditions are FIXED. |
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| 382 | ! -------------------------------------------------------- |
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| 383 | |
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| 384 | IF( ( kt < nit000 + 3 .AND. .NOT.ln_rstart ) .OR. lfbcnorth ) THEN |
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| 385 | |
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| 386 | ! 1.1 Fixed barotropic stream function |
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| 387 | ! ------------------------------------ |
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| 388 | DO ji = nin0m1, nin1 |
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| 389 | ii = ji -1 + nimpp |
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| 390 | bsfnob(ji)=bfon(ii) |
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| 391 | END DO |
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| 392 | |
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| 393 | ELSE |
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| 394 | |
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| 395 | ! 2. Beyond the fourth time step if lfbcnorth is .FALSE. |
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| 396 | ! ----------------------------------------------------- |
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| 397 | |
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| 398 | ! 2.1. Barotropic stream function radiation |
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| 399 | ! ----------------------------------------- |
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| 400 | ! |
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| 401 | ! ji-row |
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| 402 | ! | |
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| 403 | ! //////////// |
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| 404 | ! //////////// |
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| 405 | ! nib -----f------ jpjnob |
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| 406 | ! | |
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| 407 | ! nib-- u ---- jpjnob |
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| 408 | ! | |
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| 409 | ! nibm -----f----- jpjnob-1 |
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| 410 | ! | |
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| 411 | ! nibm-- u ---- jpjnob-1 |
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| 412 | ! | |
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| 413 | ! nibm2 -----f----- jpjnob-2 |
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| 414 | ! | |
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| 415 | ! |
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| 416 | ! ... radiative conditions plus restoring term toward climatology |
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| 417 | ! ... z05cx is always the cross boundary phase velocity |
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| 418 | ! ... Initialize bsfnob to clim in any case, at the first step |
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| 419 | ! to ensure proper values at the ends of the open line. |
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| 420 | ! ... Take care that the i indices starts at nin0 (jpind) and finish |
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| 421 | ! ... at nin1 (jpinf) to be sure that jpinfm1 and jpinf are set OK. |
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| 422 | DO jj = fs_njn0-1, fs_njn1-1 ! Vector opt. |
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| 423 | DO ji = nin0p1, nin1m2 |
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| 424 | ii = ji -1 + nimpp |
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| 425 | ! ... 2* gradj(bsf) (u-point i=nibm, time mean) |
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| 426 | z2dx = ( bnbnd(ji,nibm ,nit) + bnbnd(ji,nibm ,nitm2) - 2.*bnbnd(ji,nibm2,nitm) ) & |
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| 427 | / e2u(ji,jj) |
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| 428 | ! ... 2* gradi(bsf) (f-point i=nibm, time nitm) |
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| 429 | z2dy = ( bnbnd(ji+1,nibm,nitm) - bnbnd(ji-1,nibm,nitm) ) / e1f(ji,jj) |
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| 430 | ! ... square of the norm of grad(bsf) |
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| 431 | z4nor2 = z2dx * z2dx + z2dy * z2dy |
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| 432 | ! ... minus time derivative (leap-frog) at nibm, without / 2 dt |
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| 433 | zdt = bnbnd(ji,nibm,nitm2) - bnbnd(ji,nibm,nit) |
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| 434 | ! ... j-phase speed ratio (bounded by 1) and MASKED! |
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| 435 | IF( z4nor2 == 0 ) THEN |
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| 436 | IF(lwp) WRITE(numout,*)' PB dans obc_spg_north au pt',ji,' : z4nor =0' |
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| 437 | ENDIF |
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| 438 | z05cx = zdt * z2dx / z4nor2 * bmask(ji,jj) |
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| 439 | z05cx = z05cx / e2u(ji,jj+1) |
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| 440 | z05cx = min( z05cx, 1. ) |
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| 441 | ! ... z05cx < 0, inflow zin=0, ztau=1 |
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| 442 | ! => 0, outflow zin=1, ztau=rtaun |
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| 443 | zin = sign( 1., z05cx ) |
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| 444 | zin = 0.5*( zin + abs(zin) ) |
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| 445 | ztau = (1.-zin ) * rtaunin + zin * rtaun |
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| 446 | z05cx = z05cx * zin |
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| 447 | ! ... update bsfn with radiative or climatological bsf (not mask!) |
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| 448 | bsfnob(ji) = ( ( 1. - z05cx - ztau ) * bnbnd(ji,nib ,nitm) + 2.*z05cx & |
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| 449 | * bnbnd(ji,nibm,nit) + ztau * bfon (ii) ) & |
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| 450 | / (1. + z05cx) |
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| 451 | END DO |
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| 452 | END DO |
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| 453 | |
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| 454 | ENDIF |
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| 455 | IF( lk_mpp ) CALL mppobc(bsfnob,jpind,jpinf,jpjnob-1,1,1,jpi) |
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| 456 | |
|---|
| 457 | |
|---|
| 458 | ! 3. right hand side of the barotropic elliptic equation |
|---|
| 459 | !------------------------------------------------------- |
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| 460 | |
|---|
| 461 | IF( ( neuler == 0 ) .AND. ( kt == nit000 ) ) THEN |
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| 462 | z2dtr = 1.0 / rdt |
|---|
| 463 | ELSE |
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| 464 | z2dtr = 0.5 / rdt |
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| 465 | ENDIF |
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| 466 | DO jj = fs_njn0-1, fs_njn1-1 ! Vector opt. |
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| 467 | DO ji = nin0m1, nin1 |
|---|
| 468 | gcbob(ji,jj) = gcbob(ji,jj) - hur(ji,jj+1) * e1u(ji,jj+1) / e2u(ji,jj+1) & |
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| 469 | * ( bsfnob(ji) - bsfb(ji,jj+1) ) * z2dtr * bmask(ji,jj) |
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| 470 | END DO |
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| 471 | END DO |
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| 472 | |
|---|
| 473 | END SUBROUTINE obc_spg_north |
|---|
| 474 | |
|---|
| 475 | |
|---|
| 476 | SUBROUTINE obc_spg_south ( kt ) |
|---|
| 477 | !!------------------------------------------------------------------------------ |
|---|
| 478 | !! *** SUBROUTINE obc_spg_south *** |
|---|
| 479 | !! |
|---|
| 480 | !! ** Purpose : Apply the radiation algorithm on south OBC stream function. |
|---|
| 481 | !! If lfbcsouth=T, there is no radiation but only fixed OBC |
|---|
| 482 | !! |
|---|
| 483 | !! History : |
|---|
| 484 | !! ! 95-03 (J.-M. Molines) Original from SPEM |
|---|
| 485 | !! ! 97-07 (G. Madec, J.-M. Molines) additions |
|---|
| 486 | !! ! 97-12 (M. Imbard) Mpp adaptation |
|---|
| 487 | !! ! 00-06 (J.-M. Molines) |
|---|
| 488 | !! 8.5 ! 02-10 (C. Talandier, A-M Treguier) F90 |
|---|
| 489 | !!------------------------------------------------------------------------------ |
|---|
| 490 | !! * Arguments |
|---|
| 491 | INTEGER, INTENT(in) :: kt ! ocean time-step index |
|---|
| 492 | |
|---|
| 493 | !! * Local declarations |
|---|
| 494 | INTEGER :: ii ! temporary integers |
|---|
| 495 | REAL(wp) :: & |
|---|
| 496 | z2dtr, ztau, zin , & ! temporary scalars |
|---|
| 497 | z05cx, zdt , z4nor2, & ! " " |
|---|
| 498 | z2dx , z2dy ! " " |
|---|
| 499 | !!------------------------------------------------------------------------------ |
|---|
| 500 | |
|---|
| 501 | ! 1. First three time steps and more if lfbcsouth is .TRUE. |
|---|
| 502 | ! In that case open boundary conditions are FIXED. |
|---|
| 503 | ! -------------------------------------------------------- |
|---|
| 504 | |
|---|
| 505 | IF( ( kt < nit000 + 3 .AND. .NOT.ln_rstart ) .OR. lfbcsouth ) THEN |
|---|
| 506 | |
|---|
| 507 | ! 1.1 Fixed barotropic stream function |
|---|
| 508 | ! ------------------------------------ |
|---|
| 509 | DO ji = nis0m1, nis1 |
|---|
| 510 | ii = ji -1 + nimpp |
|---|
| 511 | bsfsob(ji)=bfos(ii) |
|---|
| 512 | END DO |
|---|
| 513 | |
|---|
| 514 | ELSE |
|---|
| 515 | |
|---|
| 516 | ! 2. Beyond the fourth time step if lfbcsouth is .FALSE. |
|---|
| 517 | ! ----------------------------------------------------- |
|---|
| 518 | |
|---|
| 519 | ! 2.1. Barotropic stream function radiation |
|---|
| 520 | ! ----------------------------------------- |
|---|
| 521 | ! |
|---|
| 522 | ! ji-row |
|---|
| 523 | ! | |
|---|
| 524 | ! nibm2 -----f------ jpjsob + 2 |
|---|
| 525 | ! | |
|---|
| 526 | ! nibm -- u ----- jpjsob + 2 |
|---|
| 527 | ! | |
|---|
| 528 | ! nibm -----f----- jpjsob + 1 |
|---|
| 529 | ! | |
|---|
| 530 | ! nib -- u ----- jpjsob + 1 |
|---|
| 531 | ! | |
|---|
| 532 | ! nib -----f----- jpjsob |
|---|
| 533 | ! /////////// |
|---|
| 534 | ! /////////// |
|---|
| 535 | ! |
|---|
| 536 | ! ... radiative conditions plus restoring term toward climatology |
|---|
| 537 | ! ... z05cx is always the cross boundary phase velocity |
|---|
| 538 | ! ... Initialize bsfsob to clim in any case, at the first step |
|---|
| 539 | ! to ensure proper values at the ends of the open line. |
|---|
| 540 | ! ... Take care that the i indices starts at nis0 (jpisd) and finish |
|---|
| 541 | ! ... at nis1 (jpisf) to be sure that jpisfm1 and jpisf are set OK. |
|---|
| 542 | DO jj = fs_njs0+1, fs_njs1+1 ! Vector opt. |
|---|
| 543 | DO ji = nis0p1, nis1m2 |
|---|
| 544 | ii = ji -1 + nimpp |
|---|
| 545 | ! ... 2* gradj(bsf) (u-point i=nibm, time mean) |
|---|
| 546 | z2dx = ( - bsbnd(ji,nibm ,nit) - bsbnd(ji,nibm ,nitm2) + 2.*bsbnd(ji,nibm2,nitm) ) & |
|---|
| 547 | / e2u(ji,jj+1) |
|---|
| 548 | ! ... 2* gradi(bsf) (f-point i=nibm, time nitm) |
|---|
| 549 | z2dy = ( bsbnd(ji+1,nibm,nitm) - bsbnd(ji-1,nibm,nitm) ) / e1f(ji,jj) |
|---|
| 550 | ! ... square of the norm of grad(bsf) |
|---|
| 551 | z4nor2 = z2dx * z2dx + z2dy * z2dy |
|---|
| 552 | ! ... minus time derivative (leap-frog) at nibm, without / 2 dt |
|---|
| 553 | zdt = bsbnd(ji,nibm,nitm2) - bsbnd(ji,nibm,nit) |
|---|
| 554 | ! ... j-phase speed ratio (bounded by -1) and MASKED! |
|---|
| 555 | IF( z4nor2 == 0 ) THEN |
|---|
| 556 | IF(lwp) WRITE(numout,*)' PB dans obc_spg_south au pt ',ji,' : z4nor =0' |
|---|
| 557 | ENDIF |
|---|
| 558 | z05cx = zdt * z2dx / z4nor2 * bmask(ji,jj) |
|---|
| 559 | z05cx = z05cx / e2u(ji,jj) |
|---|
| 560 | z05cx = max( z05cx, -1. ) |
|---|
| 561 | ! ... z05cx => 0, inflow zin=0, ztau=1 |
|---|
| 562 | ! < 0, outflow zin=1, ztau=rtaus |
|---|
| 563 | zin = sign( 1., -1. * z05cx ) |
|---|
| 564 | zin = 0.5*( zin + abs(zin) ) |
|---|
| 565 | ztau = (1.-zin ) *rtausin + zin * rtaus |
|---|
| 566 | z05cx = z05cx * zin |
|---|
| 567 | ! ... update bsfn with radiative or climatological bsf (not mask!) |
|---|
| 568 | bsfsob(ji) = ( ( 1. + z05cx - ztau ) * bsbnd(ji,nib ,nitm) - 2.*z05cx & |
|---|
| 569 | * bsbnd(ji,nibm,nit) + ztau * bfos (ii) ) & |
|---|
| 570 | / (1. - z05cx) |
|---|
| 571 | END DO |
|---|
| 572 | END DO |
|---|
| 573 | |
|---|
| 574 | ENDIF |
|---|
| 575 | IF( lk_mpp ) CALL mppobc(bsfsob,jpisd,jpisf,jpjsob+1,1,1,jpi) |
|---|
| 576 | |
|---|
| 577 | |
|---|
| 578 | ! 3. right hand side of the barotropic elliptic equation |
|---|
| 579 | ! ------------------------------------------------------- |
|---|
| 580 | |
|---|
| 581 | IF( ( neuler == 0 ) .AND. ( kt == nit000 ) ) THEN |
|---|
| 582 | z2dtr = 1.0 / rdt |
|---|
| 583 | ELSE |
|---|
| 584 | z2dtr = 0.5 / rdt |
|---|
| 585 | ENDIF |
|---|
| 586 | DO jj = fs_njs0+1, fs_njs1+1 ! Vector opt. |
|---|
| 587 | DO ji = nis0m1, nis1 |
|---|
| 588 | gcbob(ji,jj) = gcbob(ji,jj) - hur(ji,jj) * e1u(ji,jj) / e2u(ji,jj) & |
|---|
| 589 | * ( bsfsob(ji) - bsfb(ji,jj-1) ) * z2dtr * bmask(ji,jj) |
|---|
| 590 | END DO |
|---|
| 591 | END DO |
|---|
| 592 | |
|---|
| 593 | END SUBROUTINE obc_spg_south |
|---|
| 594 | |
|---|
| 595 | #else |
|---|
| 596 | !!---------------------------------------------------------------------- |
|---|
| 597 | !! Default case : Empty module |
|---|
| 598 | !!---------------------------------------------------------------------- |
|---|
| 599 | CONTAINS |
|---|
| 600 | SUBROUTINE obc_spg( kt ) ! Empty routine |
|---|
| 601 | INTEGER, INTENT( in ) :: kt |
|---|
| 602 | WRITE(*,*) 'obc_spg: You should not have seen this print! error?', kt |
|---|
| 603 | END SUBROUTINE obc_spg |
|---|
| 604 | #endif |
|---|
| 605 | |
|---|
| 606 | !!====================================================================== |
|---|
| 607 | END MODULE obcspg |
|---|
