[3] | 1 | MODULE obcvol |
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| 2 | !!================================================================================= |
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| 3 | !! *** MODULE obcvol *** |
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[32] | 4 | !! Ocean dynamic : Volume constraint when OBC and Free surface are used |
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[3] | 5 | !!================================================================================= |
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[1528] | 6 | #if defined key_obc && ! defined key_vvl |
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[3] | 7 | !!--------------------------------------------------------------------------------- |
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[1528] | 8 | !! 'key_obc' and NOT open boundary conditions |
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| 9 | !! 'key_vvl' constant volume free surface |
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[3] | 10 | !!--------------------------------------------------------------------------------- |
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| 11 | !! * Modules used |
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| 12 | USE oce ! ocean dynamics and tracers |
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| 13 | USE dom_oce ! ocean space and time domain |
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[1151] | 14 | USE sbc_oce ! ocean surface boundary conditions |
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[3] | 15 | USE phycst ! physical constants |
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| 16 | USE obc_oce ! ocean open boundary conditions |
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| 17 | USE lib_mpp ! for mppsum |
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| 18 | USE in_out_manager ! I/O manager |
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| 19 | |
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| 20 | IMPLICIT NONE |
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| 21 | PRIVATE |
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| 22 | |
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| 23 | !! * Accessibility |
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[367] | 24 | PUBLIC obc_vol ! routine called by dynspg_flt |
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[3] | 25 | |
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| 26 | !! * Substitutions |
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| 27 | # include "domzgr_substitute.h90" |
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| 28 | # include "obc_vectopt_loop_substitute.h90" |
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| 29 | !!--------------------------------------------------------------------------------- |
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[247] | 30 | !! OPA 9.0 , LOCEAN-IPSL (2005) |
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[1152] | 31 | !! $Id$ |
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[247] | 32 | !! This software is governed by the CeCILL licence see modipsl/doc/NEMO_CeCILL.txt |
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[3] | 33 | !!--------------------------------------------------------------------------------- |
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| 34 | |
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| 35 | CONTAINS |
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| 36 | |
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| 37 | SUBROUTINE obc_vol ( kt ) |
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| 38 | !!------------------------------------------------------------------------------ |
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| 39 | !! *** ROUTINE obcvol *** |
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| 40 | !! |
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| 41 | !! ** Purpose : |
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[367] | 42 | !! This routine is called in dynspg_flt to control |
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[3] | 43 | !! the volume of the system. A correction velocity is calculated |
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| 44 | !! to correct the total transport through the OBC. |
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| 45 | !! The total depth used is constant (H0) to be consistent with the |
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| 46 | !! linear free surface coded in OPA 8.2 |
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| 47 | !! |
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| 48 | !! ** Method : |
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| 49 | !! The correction velocity (zubtpecor here) is defined calculating |
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| 50 | !! the total transport through all open boundaries (trans_obc) minus |
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| 51 | !! the cumulate E-P flux (zCflxemp) divided by the total lateral |
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| 52 | !! surface (obcsurftot) of these OBC. |
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| 53 | !! |
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| 54 | !! zubtpecor = [trans_obc - zCflxemp ]*(1./obcsurftot) |
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| 55 | !! |
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| 56 | !! with zCflxemp => sum of (Evaporation minus Precipitation) |
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| 57 | !! over all the domain in m3/s at each time step. |
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| 58 | !! |
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| 59 | !! zCflxemp < 0 when precipitation dominate |
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| 60 | !! zCflxemp > 0 when evaporation dominate |
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| 61 | !! |
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| 62 | !! There are 2 options (user's desiderata): |
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| 63 | !! |
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| 64 | !! 1/ The volume changes according to E-P, this is the default |
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| 65 | !! option. In this case the cumulate E-P flux are setting to |
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| 66 | !! zero (zCflxemp=0) to calculate the correction velocity. So |
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| 67 | !! it will only balance the flux through open boundaries. |
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| 68 | !! (set volemp to 0 in tne namelist for this option) |
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| 69 | !! |
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| 70 | !! 2/ The volume is constant even with E-P flux. In this case |
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| 71 | !! the correction velocity must balance both the flux |
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| 72 | !! through open boundaries and the ones through the free |
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| 73 | !! surface. |
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| 74 | !! (set volemp to 1 in tne namelist for this option) |
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| 75 | !! |
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| 76 | !! History : |
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[32] | 77 | !! 8.5 ! 02-10 (C. Talandier, A-M. Treguier) Original code |
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[3] | 78 | !!---------------------------------------------------------------------------- |
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| 79 | !! * Arguments |
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| 80 | INTEGER, INTENT( in ) :: kt ! ocean time-step index |
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| 81 | |
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| 82 | !! * Local declarations |
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| 83 | INTEGER :: ji, jj, jk |
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| 84 | REAL(wp) :: zubtpecor |
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| 85 | REAL(wp) :: zCflxemp |
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| 86 | REAL(wp) :: ztransw, ztranse, ztransn, ztranss, ztranst |
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| 87 | !!----------------------------------------------------------------------------- |
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| 88 | |
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| 89 | IF( kt == nit000 ) THEN |
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| 90 | IF(lwp) WRITE(numout,*)' ' |
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| 91 | IF(lwp) WRITE(numout,*)'obc_vol : Correction of velocities along OBC' |
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| 92 | IF(lwp) WRITE(numout,*)'~~~~~~~' |
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| 93 | IF(lwp) WRITE(numout,*)' ' |
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| 94 | END IF |
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| 95 | |
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| 96 | ! 1. Calculate the cumulate surface Flux zCflxemp (m3/s) over all the domain. |
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| 97 | ! --------------------------------------------------------------------------- |
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| 98 | |
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[1739] | 99 | zCflxemp = SUM ( emp(:,:)*obctmsk(:,:)* e1t(:,:) * e2t(:,:) / rau0 ) |
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[1151] | 100 | |
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[32] | 101 | IF( lk_mpp ) CALL mpp_sum( zCflxemp ) ! sum over the global domain |
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[3] | 102 | |
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| 103 | ! 2. Barotropic velocity for each open boundary |
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| 104 | ! --------------------------------------------- |
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| 105 | |
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| 106 | zubtpecor = 0.e0 |
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| 107 | |
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[1151] | 108 | ! ... East open boundary |
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| 109 | IF( lp_obc_east ) THEN ! ... Total transport through the East OBC |
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| 110 | DO ji = fs_nie0, fs_nie1 ! Vector opt. |
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[3] | 111 | DO jk = 1, jpkm1 |
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| 112 | DO jj = 1, jpj |
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[1151] | 113 | zubtpecor = zubtpecor - ua(ji,jj,jk)*e2u(ji,jj)*fse3u(ji,jj,jk) * & |
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| 114 | & uemsk(jj,jk)*MAX(obctmsk(ji,jj),obctmsk(ji+1,jj) ) |
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[3] | 115 | END DO |
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| 116 | END DO |
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| 117 | END DO |
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| 118 | END IF |
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| 119 | |
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[1151] | 120 | ! ... West open boundary |
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| 121 | IF( lp_obc_west ) THEN ! ... Total transport through the West OBC |
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| 122 | DO ji = fs_niw0, fs_niw1 ! Vector opt. |
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[3] | 123 | DO jk = 1, jpkm1 |
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| 124 | DO jj = 1, jpj |
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[1151] | 125 | zubtpecor = zubtpecor + ua(ji,jj,jk)*e2u(ji,jj)*fse3u(ji,jj,jk) * & |
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| 126 | & uwmsk(jj,jk) *MAX(obctmsk(ji,jj),obctmsk(ji+1,jj) ) |
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[3] | 127 | END DO |
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| 128 | END DO |
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| 129 | END DO |
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[1151] | 130 | ENDIF |
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[3] | 131 | |
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| 132 | ! ... North open boundary |
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[78] | 133 | IF( lp_obc_north ) THEN ! ... Total transport through the North OBC |
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[3] | 134 | DO jj = fs_njn0, fs_njn1 ! Vector opt. |
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| 135 | DO jk = 1, jpkm1 |
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| 136 | DO ji = 1, jpi |
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[1151] | 137 | zubtpecor = zubtpecor - va(ji,jj,jk)*e1v(ji,jj)*fse3v(ji,jj,jk) * & |
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| 138 | & vnmsk(ji,jk) * MAX(obctmsk(ji,jj),obctmsk(ji,jj+1) ) |
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[3] | 139 | END DO |
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| 140 | END DO |
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| 141 | END DO |
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[1151] | 142 | ENDIF |
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[3] | 143 | |
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| 144 | ! ... South open boundary |
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[78] | 145 | IF( lp_obc_south ) THEN ! ... Total transport through the South OBC |
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[3] | 146 | DO jj = fs_njs0, fs_njs1 ! Vector opt. |
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| 147 | DO jk = 1, jpkm1 |
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| 148 | DO ji = 1, jpi |
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[1151] | 149 | zubtpecor = zubtpecor + va(ji,jj,jk)*e1v(ji,jj)*fse3v(ji,jj,jk) * & |
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| 150 | & vsmsk(ji,jk) * MAX(obctmsk(ji,jj),obctmsk(ji,jj+1) ) |
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[3] | 151 | END DO |
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| 152 | END DO |
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| 153 | END DO |
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[1151] | 154 | ENDIF |
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[3] | 155 | |
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[32] | 156 | IF( lk_mpp ) CALL mpp_sum( zubtpecor ) ! sum over the global domain |
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[3] | 157 | |
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[32] | 158 | |
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[3] | 159 | ! 3. The normal velocity correction |
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| 160 | ! --------------------------------- |
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[32] | 161 | IF( lwp .AND. MOD( kt, nwrite ) == 0) THEN |
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[3] | 162 | IF(lwp) WRITE(numout,*)' ' |
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| 163 | IF(lwp) WRITE(numout,*)'obc_vol : time step :', kt |
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| 164 | IF(lwp) WRITE(numout,*)'~~~~~~~ ' |
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| 165 | IF(lwp) WRITE(numout,*)' cumulate flux EMP :', zCflxemp,' (m3/s)' |
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[1151] | 166 | IF(lwp) WRITE(numout,*)' lateral transport :',zubtpecor,'(m3/s)' |
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| 167 | IF(lwp) WRITE(numout,*)' net inflow :',zubtpecor-zCflxemp,'(m3/s)' |
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| 168 | ENDIF |
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| 169 | |
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| 170 | zubtpecor = (zubtpecor - zCflxemp*volemp)*(1./obcsurftot) |
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| 171 | |
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| 172 | IF( lwp .AND. MOD( kt, nwrite ) == 0) THEN |
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[3] | 173 | IF(lwp) WRITE(numout,*)' total lateral surface of OBC :',obcsurftot,'(m2)' |
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| 174 | IF(lwp) WRITE(numout,*)' correction velocity zubtpecor :',zubtpecor,'(m/s)' |
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| 175 | IF(lwp) WRITE(numout,*)' ' |
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| 176 | END IF |
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| 177 | |
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| 178 | ! 4. Correction of the total velocity on each open |
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[1151] | 179 | ! boundary to respect the mass flux conservation |
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[3] | 180 | ! ------------------------------------------------- |
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| 181 | |
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[1151] | 182 | ztranse = 0.e0 ; ztransw = 0.e0 ; ztransn = 0.e0 ; ztranss = 0.e0 |
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| 183 | ztranst = 0.e0 ! total |
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[3] | 184 | |
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[78] | 185 | IF( lp_obc_west ) THEN |
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[3] | 186 | ! ... correction of the west velocity |
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| 187 | DO ji = fs_niw0, fs_niw1 ! Vector opt. |
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| 188 | DO jk = 1, jpkm1 |
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| 189 | DO jj = 1, jpj |
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| 190 | ua(ji,jj,jk) = ua(ji,jj,jk) - zubtpecor*uwmsk(jj,jk) |
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[1151] | 191 | ztransw= ztransw + ua(ji,jj,jk)*fse3u(ji,jj,jk)*e2u(ji,jj)*uwmsk(jj,jk) * & |
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| 192 | & MAX(obctmsk(ji,jj),obctmsk(ji+1,jj) ) |
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[3] | 193 | END DO |
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| 194 | END DO |
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| 195 | END DO |
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| 196 | |
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[32] | 197 | IF( lk_mpp ) CALL mpp_sum( ztransw ) ! sum over the global domain |
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[3] | 198 | |
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[1151] | 199 | IF( lwp .AND. MOD( kt, nwrite ) == 0) WRITE(numout,*)' West OB transport ztransw :', ztransw,'(m3/s)' |
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[3] | 200 | END IF |
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| 201 | |
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[78] | 202 | IF( lp_obc_east ) THEN |
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[3] | 203 | |
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| 204 | ! ... correction of the east velocity |
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| 205 | DO ji = fs_nie0, fs_nie1 ! Vector opt. |
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| 206 | DO jk = 1, jpkm1 |
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| 207 | DO jj = 1, jpj |
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| 208 | ua(ji,jj,jk) = ua(ji,jj,jk) + zubtpecor*uemsk(jj,jk) |
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[1151] | 209 | ztranse= ztranse + ua(ji,jj,jk)*fse3u(ji,jj,jk)*e2u(ji,jj)*uemsk(jj,jk) * & |
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| 210 | & MAX(obctmsk(ji,jj),obctmsk(ji+1,jj) ) |
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[3] | 211 | END DO |
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| 212 | END DO |
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| 213 | END DO |
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| 214 | |
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[32] | 215 | IF( lk_mpp ) CALL mpp_sum( ztranse ) ! sum over the global domain |
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[3] | 216 | |
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[32] | 217 | IF( lwp .AND. MOD( kt, nwrite ) == 0) THEN |
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[3] | 218 | IF(lwp) WRITE(numout,*)' East OB transport ztranse :', ztranse,'(m3/s)' |
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| 219 | END IF |
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| 220 | |
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| 221 | END IF |
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| 222 | |
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[78] | 223 | IF( lp_obc_north ) THEN |
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[3] | 224 | |
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| 225 | ! ... correction of the north velocity |
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| 226 | DO jj = fs_njn0, fs_njn1 ! Vector opt. |
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| 227 | DO jk = 1, jpkm1 |
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| 228 | DO ji = 1, jpi |
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| 229 | va(ji,jj,jk) = va(ji,jj,jk) + zubtpecor*vnmsk(ji,jk) |
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[1151] | 230 | ztransn= ztransn + va(ji,jj,jk)*fse3v(ji,jj,jk)*e1v(ji,jj)*vnmsk(ji,jk) * & |
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| 231 | & MAX(obctmsk(ji,jj),obctmsk(ji,jj+1) ) |
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[3] | 232 | END DO |
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| 233 | END DO |
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| 234 | END DO |
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[32] | 235 | IF( lk_mpp ) CALL mpp_sum( ztransn ) ! sum over the global domain |
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[3] | 236 | |
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[32] | 237 | IF( lwp .AND. MOD( kt, nwrite ) == 0) THEN |
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[3] | 238 | IF(lwp) WRITE(numout,*)' North OB transport ztransn :', ztransn,'(m3/s)' |
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| 239 | END IF |
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| 240 | |
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| 241 | END IF |
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| 242 | |
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[78] | 243 | IF( lp_obc_south ) THEN |
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[3] | 244 | |
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| 245 | ! ... correction of the south velocity |
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| 246 | DO jj = fs_njs0, fs_njs1 ! Vector opt. |
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| 247 | DO jk = 1, jpkm1 |
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| 248 | DO ji = 1, jpi |
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| 249 | va(ji,jj,jk) = va(ji,jj,jk) - zubtpecor*vsmsk(ji,jk) |
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[1151] | 250 | ztranss= ztranss + va(ji,jj,jk)*fse3v(ji,jj,jk)*e1v(ji,jj)*vsmsk(ji,jk) * & |
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| 251 | & MAX(obctmsk(ji,jj),obctmsk(ji,jj+1) ) |
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[3] | 252 | END DO |
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| 253 | END DO |
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| 254 | END DO |
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[32] | 255 | IF( lk_mpp ) CALL mpp_sum( ztranss ) ! sum over the global domain |
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[3] | 256 | |
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[32] | 257 | IF( lwp .AND. MOD( kt, nwrite ) == 0) THEN |
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[3] | 258 | IF(lwp) WRITE(numout,*)' South OB transport ztranss :', ztranss,'(m3/s)' |
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| 259 | END IF |
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| 260 | |
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| 261 | END IF |
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| 262 | |
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| 263 | ! 5. Check the cumulate transport through OBC |
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| 264 | ! once barotropic velocities corrected |
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| 265 | ! ------------------------------------------- |
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| 266 | |
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| 267 | |
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[32] | 268 | IF( lwp .AND. MOD( kt, nwrite ) == 0) THEN |
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[1151] | 269 | ztranst = ztransw - ztranse + ztranss - ztransn |
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[3] | 270 | IF(lwp) WRITE(numout,*)' ' |
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| 271 | IF(lwp) WRITE(numout,*)' Cumulate transport ztranst =', ztranst,'(m3/s)' |
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[1151] | 272 | IF(lwp) WRITE(numout,*)' Balance =', ztranst - zCflxemp ,'(m3/s)' |
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[3] | 273 | IF(lwp) WRITE(numout,*)' ' |
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| 274 | END IF |
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| 275 | |
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| 276 | END SUBROUTINE obc_vol |
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| 277 | |
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| 278 | #else |
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| 279 | !!--------------------------------------------------------------------------------- |
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| 280 | !! Default option : Empty module |
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| 281 | !!--------------------------------------------------------------------------------- |
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| 282 | CONTAINS |
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| 283 | SUBROUTINE obc_vol ! Empty routine |
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| 284 | END SUBROUTINE obc_vol |
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| 285 | #endif |
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| 286 | |
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| 287 | !!================================================================================= |
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| 288 | END MODULE obcvol |
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