[3] | 1 | MODULE istate |
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| 2 | !!====================================================================== |
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| 3 | !! *** MODULE istate *** |
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| 4 | !! Ocean state : initial state setting |
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| 5 | !!===================================================================== |
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[508] | 6 | !! History : 4.0 ! 89-12 (P. Andrich) Original code |
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| 7 | !! 5.0 ! 91-11 (G. Madec) rewritting |
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| 8 | !! 6.0 ! 96-01 (G. Madec) terrain following coordinates |
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| 9 | !! 8.0 ! 01-09 (M. Levy, M. Ben Jelloul) istate_eel |
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| 10 | !! 8.0 ! 01-09 (M. Levy, M. Ben Jelloul) istate_uvg |
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| 11 | !! 9.0 ! 03-08 (G. Madec) F90: Free form, modules |
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| 12 | !! 9.0 ! 03-09 (G. Madec, C. Talandier) add EEL R5 |
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| 13 | !! 9.0 ! 04-05 (A. Koch-Larrouy) istate_gyre |
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| 14 | !! 9.0 ! 06-07 (S. Masson) distributed restart using iom |
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| 15 | !!---------------------------------------------------------------------- |
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[3] | 16 | |
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| 17 | !!---------------------------------------------------------------------- |
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| 18 | !! istate_init : initial state setting |
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| 19 | !! istate_tem : analytical profile for initial Temperature |
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| 20 | !! istate_sal : analytical profile for initial Salinity |
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| 21 | !! istate_eel : initial state setting of EEL R5 configuration |
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[93] | 22 | !! istate_gyre : initial state setting of GYRE configuration |
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[3] | 23 | !! istate_uvg : initial velocity in geostropic balance |
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| 24 | !!---------------------------------------------------------------------- |
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| 25 | USE oce ! ocean dynamics and active tracers |
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| 26 | USE dom_oce ! ocean space and time domain |
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| 27 | USE daymod ! |
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| 28 | USE ldftra_oce ! ocean active tracers: lateral physics |
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| 29 | USE zdf_oce ! ocean vertical physics |
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| 30 | USE phycst ! physical constants |
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| 31 | USE wzvmod ! verctical velocity (wzv routine) |
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| 32 | USE dtatem ! temperature data (dta_tem routine) |
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| 33 | USE dtasal ! salinity data (dta_sal routine) |
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| 34 | USE restart ! ocean restart (rst_read routine) |
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| 35 | USE solisl ! ??? |
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[508] | 36 | USE in_out_manager ! I/O manager |
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| 37 | USE iom |
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| 38 | |
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[3] | 39 | IMPLICIT NONE |
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| 40 | PRIVATE |
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| 41 | |
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[508] | 42 | PUBLIC istate_init ! routine called by step.F90 |
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[3] | 43 | |
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| 44 | !! * Substitutions |
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| 45 | # include "domzgr_substitute.h90" |
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| 46 | # include "vectopt_loop_substitute.h90" |
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| 47 | !!---------------------------------------------------------------------- |
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[508] | 48 | !! OPA 9.0 , LOCEAN-IPSL (2006) |
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[247] | 49 | !! $Header$ |
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[508] | 50 | !! Software governed by the CeCILL licence (modipsl/doc/NEMO_CeCILL.txt) |
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[3] | 51 | !!---------------------------------------------------------------------- |
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| 52 | |
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| 53 | CONTAINS |
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| 54 | |
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| 55 | SUBROUTINE istate_init |
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| 56 | !!---------------------------------------------------------------------- |
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| 57 | !! *** ROUTINE istate_init *** |
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| 58 | !! |
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[508] | 59 | !! ** Purpose : Initialization of the dynamics and tracer fields. |
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[3] | 60 | !!---------------------------------------------------------------------- |
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| 61 | |
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[508] | 62 | IF(lwp) WRITE(numout,*) |
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| 63 | IF(lwp) WRITE(numout,*) 'istate_ini : Initialization of the dynamics and tracers' |
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| 64 | IF(lwp) WRITE(numout,*) '~~~~~~~~~~' |
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[3] | 65 | |
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| 66 | rhd (:,:,:) = 0.e0 |
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| 67 | rhop (:,:,:) = 0.e0 |
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| 68 | rn2 (:,:,:) = 0.e0 |
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| 69 | |
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[15] | 70 | IF( ln_rstart ) THEN ! Restart from a file |
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[3] | 71 | ! ! ------------------- |
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| 72 | neuler = 1 ! Set time-step indicator at nit000 (leap-frog) |
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| 73 | CALL rst_read ! Read the restart file |
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| 74 | ELSE |
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| 75 | ! ! Start from rest |
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| 76 | ! ! --------------- |
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| 77 | neuler = 0 ! Set time-step indicator at nit000 (euler forward) |
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| 78 | adatrj = 0._wp |
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[508] | 79 | ! ! Initialization of ocean to zero |
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| 80 | ! before fields ! now fields |
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| 81 | ; ub (:,:,:) = 0.e0 ; un (:,:,:) = 0.e0 |
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| 82 | ; vb (:,:,:) = 0.e0 ; vn (:,:,:) = 0.e0 |
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| 83 | ; rotb (:,:,:) = 0.e0 ; rotn (:,:,:) = 0.e0 |
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| 84 | ; hdivb(:,:,:) = 0.e0 ; hdivn(:,:,:) = 0.e0 |
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| 85 | ! |
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[3] | 86 | IF( cp_cfg == 'eel' ) THEN |
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[93] | 87 | CALL istate_eel ! EEL configuration : start from pre-defined |
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| 88 | ! ! velocity and thermohaline fields |
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[434] | 89 | ELSEIF( cp_cfg == 'gyre' ) THEN |
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[93] | 90 | CALL istate_gyre ! GYRE configuration : start from pre-defined temperature |
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| 91 | ! ! and salinity fields |
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[3] | 92 | ELSE |
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[508] | 93 | ! ! Other configurations: Initial temperature and salinity fields |
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[3] | 94 | #if defined key_dtatem |
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| 95 | CALL dta_tem( nit000 ) ! read 3D temperature data |
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| 96 | tb(:,:,:) = t_dta(:,:,:) ! use temperature data read |
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| 97 | tn(:,:,:) = t_dta(:,:,:) |
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| 98 | #else |
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| 99 | IF(lwp) WRITE(numout,*) ! analytical temperature profile |
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[508] | 100 | IF(lwp) WRITE(numout,*)' Temperature initialization using an analytic profile' |
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[3] | 101 | CALL istate_tem |
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| 102 | #endif |
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| 103 | #if defined key_dtasal |
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| 104 | CALL dta_sal( nit000 ) ! read 3D salinity data |
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| 105 | sb(:,:,:) = s_dta(:,:,:) ! use salinity data read |
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| 106 | sn(:,:,:) = s_dta(:,:,:) |
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| 107 | #else |
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| 108 | ! No salinity data |
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| 109 | IF(lwp)WRITE(numout,*) ! analytical salinity profile |
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[508] | 110 | IF(lwp)WRITE(numout,*)' Salinity initialisation using a constant value' |
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[3] | 111 | CALL istate_sal |
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| 112 | #endif |
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| 113 | ENDIF |
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| 114 | |
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| 115 | ENDIF |
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| 116 | ! ! Vertical velocity |
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| 117 | ! ! ----------------- |
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| 118 | CALL wzv( nit000 ) ! from horizontal divergence |
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[508] | 119 | ! |
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[3] | 120 | END SUBROUTINE istate_init |
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| 121 | |
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| 122 | |
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| 123 | SUBROUTINE istate_tem |
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| 124 | !!--------------------------------------------------------------------- |
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| 125 | !! *** ROUTINE istate_tem *** |
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| 126 | !! |
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| 127 | !! ** Purpose : Intialization of the temperature field with an |
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| 128 | !! analytical profile or a file (i.e. in EEL configuration) |
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| 129 | !! |
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| 130 | !! ** Method : Use Philander analytic profile of temperature |
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| 131 | !! |
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| 132 | !! References : Philander ??? |
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| 133 | !!---------------------------------------------------------------------- |
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| 134 | INTEGER :: ji, jj, jk |
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| 135 | !!---------------------------------------------------------------------- |
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[508] | 136 | ! |
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[3] | 137 | IF(lwp) WRITE(numout,*) |
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| 138 | IF(lwp) WRITE(numout,*) 'istate_tem : initial temperature profile' |
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| 139 | IF(lwp) WRITE(numout,*) '~~~~~~~~~~' |
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| 140 | |
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| 141 | DO jk = 1, jpk |
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| 142 | DO jj = 1, jpj |
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| 143 | DO ji = 1, jpi |
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| 144 | tn(ji,jj,jk) = ( ( ( 7.5 - 0.*ABS(gphit(ji,jj))/30. ) & |
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[15] | 145 | & *( 1.-TANH((fsdept(ji,jj,jk)-80.)/30.) ) & |
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| 146 | & + 10.*(5000.-fsdept(ji,jj,jk))/5000.) ) * tmask(ji,jj,jk) |
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[3] | 147 | tb(ji,jj,jk) = tn(ji,jj,jk) |
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| 148 | END DO |
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| 149 | END DO |
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| 150 | END DO |
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| 151 | |
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[79] | 152 | IF(lwp) CALL prizre( tn , jpi , jpj , jpk , jpj/2 , & |
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| 153 | & 1 , jpi , 5 , 1 , jpk , & |
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| 154 | & 1 , 1. , numout ) |
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[508] | 155 | ! |
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[3] | 156 | END SUBROUTINE istate_tem |
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| 157 | |
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| 158 | |
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| 159 | SUBROUTINE istate_sal |
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| 160 | !!--------------------------------------------------------------------- |
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| 161 | !! *** ROUTINE istate_sal *** |
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| 162 | !! |
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| 163 | !! ** Purpose : Intialize the salinity field with an analytic profile |
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| 164 | !! |
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| 165 | !! ** Method : Use to a constant value 35.5 |
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| 166 | !! |
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| 167 | !! ** Action : Initialize sn and sb |
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| 168 | !!---------------------------------------------------------------------- |
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| 169 | REAL(wp) :: zsal = 35.50_wp |
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| 170 | !!---------------------------------------------------------------------- |
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| 171 | |
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| 172 | IF(lwp) WRITE(numout,*) |
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| 173 | IF(lwp) WRITE(numout,*) 'istate_sal : initial salinity : ', zsal |
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| 174 | IF(lwp) WRITE(numout,*) '~~~~~~~~~~' |
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| 175 | |
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| 176 | sn(:,:,:) = zsal * tmask(:,:,:) |
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| 177 | sb(:,:,:) = sn(:,:,:) |
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| 178 | |
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| 179 | END SUBROUTINE istate_sal |
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| 180 | |
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| 181 | |
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| 182 | SUBROUTINE istate_eel |
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| 183 | !!---------------------------------------------------------------------- |
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| 184 | !! *** ROUTINE istate_eel *** |
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| 185 | !! |
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| 186 | !! ** Purpose : Initialization of the dynamics and tracers for EEL R5 |
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| 187 | !! configuration (channel with or without a topographic bump) |
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| 188 | !! |
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| 189 | !! ** Method : - set temprature field |
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| 190 | !! - set salinity field |
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| 191 | !! - set velocity field including horizontal divergence |
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| 192 | !! and relative vorticity fields |
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| 193 | !!---------------------------------------------------------------------- |
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| 194 | USE eosbn2 ! eq. of state, Brunt Vaisala frequency (eos routine) |
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| 195 | USE divcur ! hor. divergence & rel. vorticity (div_cur routine) |
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[473] | 196 | USE iom |
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[3] | 197 | |
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| 198 | INTEGER :: inum ! temporary logical unit |
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| 199 | INTEGER :: ji, jj, jk ! dummy loop indices |
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[479] | 200 | INTEGER :: ijloc |
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[508] | 201 | REAL(wp) :: zh1, zh2, zslope, zcst, zfcor ! temporary scalars |
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| 202 | REAL(wp) :: zt1 = 12._wp, & ! surface temperature value (EEL R5) |
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| 203 | & zt2 = 2._wp, & ! bottom temperature value (EEL R5) |
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| 204 | & zsal = 35.5_wp, & ! constant salinity (EEL R2, R5 and R6) |
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| 205 | & zueel = 0.1_wp ! constant uniform zonal velocity (EEL R5) |
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[359] | 206 | # if ! defined key_dynspg_rl |
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[508] | 207 | REAL(wp), DIMENSION(jpiglo,jpjglo) :: zssh ! initial ssh over the global domain |
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[3] | 208 | # endif |
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| 209 | !!---------------------------------------------------------------------- |
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| 210 | |
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| 211 | SELECT CASE ( jp_cfg ) |
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| 212 | ! ! ==================== |
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| 213 | CASE ( 5 ) ! EEL R5 configuration |
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| 214 | ! ! ==================== |
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| 215 | |
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| 216 | ! set temperature field with a linear profile |
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| 217 | ! ------------------------------------------- |
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| 218 | IF(lwp) WRITE(numout,*) |
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| 219 | IF(lwp) WRITE(numout,*) 'istate_eel : EEL R5: linear temperature profile' |
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| 220 | IF(lwp) WRITE(numout,*) '~~~~~~~~~~' |
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| 221 | |
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[467] | 222 | zh1 = gdept_0( 1 ) |
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| 223 | zh2 = gdept_0(jpkm1) |
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[3] | 224 | |
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| 225 | zslope = ( zt1 - zt2 ) / ( zh1 - zh2 ) |
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| 226 | zcst = ( zt1 * ( zh1 - zh2) - ( zt1 - zt2 ) * zh1 ) / ( zh1 - zh2 ) |
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| 227 | |
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| 228 | DO jk = 1, jpk |
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| 229 | tn(:,:,jk) = ( zslope * fsdept(:,:,jk) + zcst ) * tmask(:,:,jk) |
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| 230 | tb(:,:,jk) = tn(:,:,jk) |
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| 231 | END DO |
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| 232 | |
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| 233 | IF(lwp) CALL prizre( tn , jpi , jpj , jpk , jpj/2 , & |
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| 234 | & 1 , jpi , 5 , 1 , jpk , & |
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| 235 | & 1 , 1. , numout ) |
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| 236 | |
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| 237 | ! set salinity field to a constant value |
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| 238 | ! -------------------------------------- |
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| 239 | IF(lwp) WRITE(numout,*) |
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| 240 | IF(lwp) WRITE(numout,*) 'istate_eel : EEL R5: constant salinity field, S = ', zsal |
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| 241 | IF(lwp) WRITE(numout,*) '~~~~~~~~~~' |
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| 242 | |
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| 243 | sn(:,:,:) = zsal * tmask(:,:,:) |
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| 244 | sb(:,:,:) = sn(:,:,:) |
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| 245 | |
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| 246 | |
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[359] | 247 | # if ! defined key_dynspg_rl |
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[3] | 248 | ! set the dynamics: U,V, hdiv, rot (and ssh if necessary) |
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| 249 | ! ---------------- |
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| 250 | ! Start EEL5 configuration with barotropic geostrophic velocities |
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| 251 | ! according the sshb and sshn SSH imposed. |
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[479] | 252 | ! we assume a uniform grid (hence the use of e1t(1,1) for delta_y) |
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| 253 | ! we use the Coriolis frequency at mid-channel. |
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| 254 | |
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| 255 | ub(:,:,:) = zueel * umask(:,:,:) |
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[3] | 256 | un(:,:,:) = ub(:,:,:) |
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[479] | 257 | ijloc = mj0(INT(jpjglo-1)/2) |
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| 258 | zfcor = ff(1,ijloc) |
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[3] | 259 | |
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| 260 | DO jj = 1, jpjglo |
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[479] | 261 | zssh(:,jj) = - (FLOAT(jj)- FLOAT(jpjglo-1)/2.)*zueel*e1t(1,1)*zfcor/grav |
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[3] | 262 | END DO |
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[479] | 263 | |
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| 264 | IF(lwp) THEN |
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| 265 | WRITE(numout,*) ' Uniform zonal velocity for EEL R5:',zueel |
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| 266 | WRITE(numout,*) ' Geostrophic SSH profile as a function of y:' |
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| 267 | WRITE(numout,'(12(1x,f6.2))') zssh(1,:) |
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| 268 | ENDIF |
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| 269 | |
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[3] | 270 | DO jj = 1, nlcj |
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| 271 | DO ji = 1, nlci |
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| 272 | sshb(ji,jj) = zssh( mig(ji) , mjg(jj) ) * tmask(ji,jj,1) |
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| 273 | END DO |
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| 274 | END DO |
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| 275 | sshb(nlci+1:jpi, : ) = 0.e0 ! set to zero extra mpp columns |
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| 276 | sshb( : ,nlcj+1:jpj) = 0.e0 ! set to zero extra mpp rows |
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| 277 | |
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| 278 | sshn(:,:) = sshb(:,:) ! set now ssh to the before value |
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| 279 | |
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| 280 | ! horizontal divergence and relative vorticity (curl) |
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| 281 | CALL div_cur( nit000 ) |
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| 282 | |
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| 283 | ! N.B. the vertical velocity will be computed from the horizontal divergence field |
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| 284 | ! in istate by a call to wzv routine |
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| 285 | # endif |
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| 286 | |
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| 287 | |
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| 288 | ! ! ========================== |
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| 289 | CASE ( 2 , 6 ) ! EEL R2 or R6 configuration |
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| 290 | ! ! ========================== |
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| 291 | |
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| 292 | ! set temperature field with a NetCDF file |
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| 293 | ! ---------------------------------------- |
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| 294 | IF(lwp) WRITE(numout,*) |
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| 295 | IF(lwp) WRITE(numout,*) 'istate_eel : EEL R2 or R6: read initial temperature in a NetCDF file' |
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| 296 | IF(lwp) WRITE(numout,*) '~~~~~~~~~~' |
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| 297 | |
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[473] | 298 | CALL iom_open ( 'eel.initemp', inum ) |
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| 299 | CALL iom_get ( inum, jpdom_data, 'initemp', tb ) ! read before temprature (tb) |
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| 300 | CALL iom_close( inum ) |
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| 301 | |
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| 302 | tn(:,:,:) = tb(:,:,:) ! set nox temperature to tb |
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[3] | 303 | |
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| 304 | IF(lwp) CALL prizre( tn , jpi , jpj , jpk , jpj/2 , & |
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| 305 | & 1 , jpi , 5 , 1 , jpk , & |
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| 306 | & 1 , 1. , numout ) |
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| 307 | |
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| 308 | |
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| 309 | ! set salinity field to a constant value |
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| 310 | ! -------------------------------------- |
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| 311 | IF(lwp) WRITE(numout,*) |
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| 312 | IF(lwp) WRITE(numout,*) 'istate_eel : EEL R5: constant salinity field, S = ', zsal |
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| 313 | IF(lwp) WRITE(numout,*) '~~~~~~~~~~' |
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| 314 | |
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| 315 | sn(:,:,:) = zsal * tmask(:,:,:) |
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| 316 | sb(:,:,:) = sn(:,:,:) |
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| 317 | |
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| 318 | |
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[79] | 319 | IF( lk_isl ) THEN |
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[3] | 320 | ! Horizontal velocity : start from geostrophy (EEL config) |
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| 321 | CALL eos( tn, sn, rhd ) ! now in situ density |
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| 322 | CALL istate_uvg ! compute geostrophic velocity |
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| 323 | |
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| 324 | ! N.B. the vertical velocity will be computed from the horizontal divergence field |
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| 325 | ! in istate by a call to wzv routine |
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| 326 | ENDIF |
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| 327 | ! ! =========================== |
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| 328 | CASE DEFAULT ! NONE existing configuration |
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| 329 | ! ! =========================== |
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[473] | 330 | WRITE(ctmp1,*) 'EEL with a ', jp_cfg,' km resolution is not coded' |
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| 331 | CALL ctl_stop( ctmp1 ) |
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| 332 | |
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[3] | 333 | END SELECT |
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| 334 | |
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| 335 | END SUBROUTINE istate_eel |
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| 336 | |
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| 337 | |
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[93] | 338 | SUBROUTINE istate_gyre |
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| 339 | !!---------------------------------------------------------------------- |
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| 340 | !! *** ROUTINE istate_gyre *** |
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| 341 | !! |
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| 342 | !! ** Purpose : Initialization of the dynamics and tracers for GYRE |
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| 343 | !! configuration (double gyre with rotated domain) |
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| 344 | !! |
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| 345 | !! ** Method : - set temprature field |
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| 346 | !! - set salinity field |
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| 347 | !!---------------------------------------------------------------------- |
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[473] | 348 | INTEGER :: ji, jj, jk ! dummy loop indices |
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[508] | 349 | INTEGER :: inum ! temporary logical unit |
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| 350 | INTEGER, PARAMETER :: ntsinit = 0 ! (0/1) (analytical/input data files) T&S initialization |
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[93] | 351 | !!---------------------------------------------------------------------- |
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| 352 | |
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[434] | 353 | SELECT CASE ( ntsinit) |
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[93] | 354 | |
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[434] | 355 | CASE ( 0 ) ! analytical T/S profil deduced from LEVITUS |
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| 356 | IF(lwp) WRITE(numout,*) |
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| 357 | IF(lwp) WRITE(numout,*) 'istate_gyre : initial analytical T and S profil deduced from LEVITUS ' |
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| 358 | IF(lwp) WRITE(numout,*) '~~~~~~~~~~~' |
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[93] | 359 | |
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[434] | 360 | DO jk = 1, jpk |
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| 361 | DO jj = 1, jpj |
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| 362 | DO ji = 1, jpi |
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| 363 | tn(ji,jj,jk) = ( 16. - 12. * TANH( (fsdept(ji,jj,jk) - 400) / 700 ) ) & |
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| 364 | & * (-TANH( (500-fsdept(ji,jj,jk)) / 150 ) + 1) / 2 & |
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| 365 | & + ( 15. * ( 1. - TANH( (fsdept(ji,jj,jk)-50.) / 1500.) ) & |
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| 366 | & - 1.4 * TANH((fsdept(ji,jj,jk)-100.) / 100.) & |
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| 367 | & + 7. * (1500. - fsdept(ji,jj,jk)) / 1500. ) & |
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| 368 | & * (-TANH( (fsdept(ji,jj,jk) - 500) / 150) + 1) / 2 |
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| 369 | tn(ji,jj,jk) = tn(ji,jj,jk) * tmask(ji,jj,jk) |
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| 370 | tb(ji,jj,jk) = tn(ji,jj,jk) |
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| 371 | |
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| 372 | sn(ji,jj,jk) = ( 36.25 - 1.13 * TANH( (fsdept(ji,jj,jk) - 305) / 460 ) ) & |
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| 373 | & * (-TANH((500 - fsdept(ji,jj,jk)) / 150) + 1) / 2 & |
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| 374 | & + ( 35.55 + 1.25 * (5000. - fsdept(ji,jj,jk)) / 5000. & |
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| 375 | & - 1.62 * TANH( (fsdept(ji,jj,jk) - 60. ) / 650. ) & |
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| 376 | & + 0.2 * TANH( (fsdept(ji,jj,jk) - 35. ) / 100. ) & |
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| 377 | & + 0.2 * TANH( (fsdept(ji,jj,jk) - 1000.) / 5000.) ) & |
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| 378 | & * (-TANH((fsdept(ji,jj,jk) - 500) / 150) + 1) / 2 |
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| 379 | sn(ji,jj,jk) = sn(ji,jj,jk) * tmask(ji,jj,jk) |
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| 380 | sb(ji,jj,jk) = sn(ji,jj,jk) |
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| 381 | END DO |
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[93] | 382 | END DO |
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| 383 | END DO |
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| 384 | |
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[434] | 385 | CASE ( 1 ) ! T/S data fields read in dta_tem.nc/data_sal.nc files |
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| 386 | IF(lwp) WRITE(numout,*) |
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| 387 | IF(lwp) WRITE(numout,*) 'istate_gyre : initial T and S read from dta_tem.nc/data_sal.nc files' |
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| 388 | IF(lwp) WRITE(numout,*) '~~~~~~~~~~~' |
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| 389 | IF(lwp) WRITE(numout,*) ' NetCDF FORMAT' |
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| 390 | |
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| 391 | ! Read temperature field |
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| 392 | ! ---------------------- |
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[473] | 393 | CALL iom_open ( 'data_tem', inum ) |
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| 394 | CALL iom_get ( inum, jpdom_data, 'votemper', tn ) |
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| 395 | CALL iom_close( inum ) |
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[434] | 396 | |
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[473] | 397 | tn(:,:,:) = tn(:,:,:) * tmask(:,:,:) |
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| 398 | tb(:,:,:) = tn(:,:,:) |
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[434] | 399 | |
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| 400 | ! Read salinity field |
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| 401 | ! ------------------- |
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[473] | 402 | CALL iom_open ( 'data_sal', inum ) |
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| 403 | CALL iom_get ( inum, jpdom_data, 'vosaline', sn ) |
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| 404 | CALL iom_close( inum ) |
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[434] | 405 | |
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[473] | 406 | sn(:,:,:) = sn(:,:,:) * tmask(:,:,:) |
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| 407 | sb(:,:,:) = sn(:,:,:) |
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[434] | 408 | |
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| 409 | END SELECT |
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| 410 | |
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[93] | 411 | IF(lwp) THEN |
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| 412 | WRITE(numout,*) |
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| 413 | WRITE(numout,*) ' Initial temperature and salinity profiles:' |
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[467] | 414 | WRITE(numout, "(9x,' level gdept_0 temperature salinity ')" ) |
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| 415 | WRITE(numout, "(10x, i4, 3f10.2)" ) ( jk, gdept_0(jk), tn(2,2,jk), sn(2,2,jk), jk = 1, jpk ) |
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[93] | 416 | ENDIF |
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| 417 | |
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| 418 | END SUBROUTINE istate_gyre |
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| 419 | |
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| 420 | |
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[3] | 421 | SUBROUTINE istate_uvg |
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| 422 | !!---------------------------------------------------------------------- |
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| 423 | !! *** ROUTINE istate_uvg *** |
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| 424 | !! |
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| 425 | !! ** Purpose : Compute the geostrophic velocities from (tn,sn) fields |
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| 426 | !! |
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| 427 | !! ** Method : Using the hydrostatic hypothesis the now hydrostatic |
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| 428 | !! pressure is computed by integrating the in-situ density from the |
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| 429 | !! surface to the bottom. |
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| 430 | !! p=integral [ rau*g dz ] |
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| 431 | !!---------------------------------------------------------------------- |
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| 432 | USE eosbn2 ! eq. of state, Brunt Vaisala frequency (eos routine) |
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[359] | 433 | USE dynspg ! surface pressure gradient (dyn_spg routine) |
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[3] | 434 | USE divcur ! hor. divergence & rel. vorticity (div_cur routine) |
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| 435 | USE lbclnk ! ocean lateral boundary condition (or mpp link) |
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| 436 | |
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| 437 | INTEGER :: ji, jj, jk ! dummy loop indices |
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| 438 | INTEGER :: indic ! ??? |
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[508] | 439 | REAL(wp) :: zmsv, zphv, zmsu, zphu, zalfg ! temporary scalars |
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| 440 | REAL(wp), DIMENSION (jpi,jpj,jpk) :: zprn ! workspace |
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[3] | 441 | !!---------------------------------------------------------------------- |
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| 442 | |
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| 443 | IF(lwp) WRITE(numout,*) |
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| 444 | IF(lwp) WRITE(numout,*) 'istate_uvg : Start from Geostrophy' |
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| 445 | IF(lwp) WRITE(numout,*) '~~~~~~~~~~' |
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| 446 | |
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| 447 | ! Compute the now hydrostatic pressure |
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| 448 | ! ------------------------------------ |
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| 449 | |
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[15] | 450 | zalfg = 0.5 * grav * rau0 |
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[508] | 451 | |
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| 452 | zprn(:,:,1) = zalfg * fse3w(:,:,1) * ( 1 + rhd(:,:,1) ) ! Surface value |
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[3] | 453 | |
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[508] | 454 | DO jk = 2, jpkm1 ! Vertical integration from the surface |
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[3] | 455 | zprn(:,:,jk) = zprn(:,:,jk-1) & |
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[359] | 456 | & + zalfg * fse3w(:,:,jk) * ( 2. + rhd(:,:,jk) + rhd(:,:,jk-1) ) |
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[3] | 457 | END DO |
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| 458 | |
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| 459 | ! Compute geostrophic balance |
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| 460 | ! --------------------------- |
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| 461 | DO jk = 1, jpkm1 |
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| 462 | DO jj = 2, jpjm1 |
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| 463 | DO ji = fs_2, fs_jpim1 ! vertor opt. |
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| 464 | zmsv = 1. / MAX( umask(ji-1,jj+1,jk) + umask(ji ,jj+1,jk) & |
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| 465 | + umask(ji-1,jj ,jk) + umask(ji ,jj ,jk) , 1. ) |
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| 466 | zphv = ( zprn(ji ,jj+1,jk) - zprn(ji-1,jj+1,jk) ) * umask(ji-1,jj+1,jk) / e1u(ji-1,jj+1) & |
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| 467 | + ( zprn(ji+1,jj+1,jk) - zprn(ji ,jj+1,jk) ) * umask(ji ,jj+1,jk) / e1u(ji ,jj+1) & |
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| 468 | + ( zprn(ji ,jj ,jk) - zprn(ji-1,jj ,jk) ) * umask(ji-1,jj ,jk) / e1u(ji-1,jj ) & |
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| 469 | + ( zprn(ji+1,jj ,jk) - zprn(ji ,jj ,jk) ) * umask(ji ,jj ,jk) / e1u(ji ,jj ) |
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| 470 | zphv = 1. / rau0 * zphv * zmsv * vmask(ji,jj,jk) |
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| 471 | |
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| 472 | zmsu = 1. / MAX( vmask(ji+1,jj ,jk) + vmask(ji ,jj ,jk) & |
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| 473 | + vmask(ji+1,jj-1,jk) + vmask(ji ,jj-1,jk) , 1. ) |
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| 474 | zphu = ( zprn(ji+1,jj+1,jk) - zprn(ji+1,jj ,jk) ) * vmask(ji+1,jj ,jk) / e2v(ji+1,jj ) & |
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| 475 | + ( zprn(ji ,jj+1,jk) - zprn(ji ,jj ,jk) ) * vmask(ji ,jj ,jk) / e2v(ji ,jj ) & |
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| 476 | + ( zprn(ji+1,jj ,jk) - zprn(ji+1,jj-1,jk) ) * vmask(ji+1,jj-1,jk) / e2v(ji+1,jj-1) & |
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| 477 | + ( zprn(ji ,jj ,jk) - zprn(ji ,jj-1,jk) ) * vmask(ji ,jj-1,jk) / e2v(ji ,jj-1) |
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| 478 | zphu = 1. / rau0 * zphu * zmsu * umask(ji,jj,jk) |
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| 479 | |
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| 480 | ! Compute the geostrophic velocities |
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| 481 | un(ji,jj,jk) = -2. * zphu / ( ff(ji,jj) + ff(ji ,jj-1) ) |
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| 482 | vn(ji,jj,jk) = 2. * zphv / ( ff(ji,jj) + ff(ji-1,jj ) ) |
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| 483 | END DO |
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| 484 | END DO |
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| 485 | END DO |
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| 486 | |
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| 487 | IF(lwp) WRITE(numout,*) ' we force to zero bottom velocity' |
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| 488 | |
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| 489 | ! Susbtract the bottom velocity (level jpk-1 for flat bottom case) |
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| 490 | ! to have a zero bottom velocity |
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| 491 | |
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| 492 | DO jk = 1, jpkm1 |
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| 493 | un(:,:,jk) = ( un(:,:,jk) - un(:,:,jpkm1) ) * umask(:,:,jk) |
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| 494 | vn(:,:,jk) = ( vn(:,:,jk) - vn(:,:,jpkm1) ) * vmask(:,:,jk) |
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| 495 | END DO |
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| 496 | |
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| 497 | CALL lbc_lnk( un, 'U', -1. ) |
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| 498 | CALL lbc_lnk( vn, 'V', -1. ) |
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| 499 | |
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| 500 | ub(:,:,:) = un(:,:,:) |
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| 501 | vb(:,:,:) = vn(:,:,:) |
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| 502 | |
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| 503 | ! WARNING !!!!! |
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| 504 | ! after initializing u and v, we need to calculate the initial streamfunction bsf. |
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| 505 | ! Otherwise, only the trend will be computed and the model will blow up (inconsistency). |
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| 506 | ! to do that, we call dyn_spg with a special trick: |
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[508] | 507 | ! we fill ua and va with the velocities divided by dt, and the streamfunction will be brought to the |
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| 508 | ! right value assuming the velocities have been set up in one time step. |
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| 509 | ! we then set bsfd to zero (first guess for next step is d(psi)/dt = 0.) |
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| 510 | ! sets up s false trend to calculate the barotropic streamfunction. |
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[3] | 511 | |
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| 512 | ua(:,:,:) = ub(:,:,:) / rdt |
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| 513 | va(:,:,:) = vb(:,:,:) / rdt |
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| 514 | |
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[359] | 515 | ! calls dyn_spg. we assume euler time step, starting from rest. |
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[3] | 516 | indic = 0 |
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[359] | 517 | CALL dyn_spg( nit000, indic ) ! surface pressure gradient |
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[3] | 518 | |
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| 519 | ! the new velocity is ua*rdt |
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| 520 | |
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| 521 | CALL lbc_lnk( ua, 'U', -1. ) |
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| 522 | CALL lbc_lnk( va, 'V', -1. ) |
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| 523 | |
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| 524 | ub(:,:,:) = ua(:,:,:) * rdt |
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| 525 | vb(:,:,:) = va(:,:,:) * rdt |
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| 526 | ua(:,:,:) = 0.e0 |
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| 527 | va(:,:,:) = 0.e0 |
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| 528 | un(:,:,:) = ub(:,:,:) |
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| 529 | vn(:,:,:) = vb(:,:,:) |
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| 530 | |
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[79] | 531 | #if defined key_dynspg_rl |
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| 532 | IF( lk_isl ) bsfb(:,:) = bsfn(:,:) ! Put bsfb to zero |
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[3] | 533 | #endif |
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| 534 | |
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| 535 | ! Compute the divergence and curl |
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| 536 | |
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| 537 | CALL div_cur( nit000 ) ! now horizontal divergence and curl |
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| 538 | |
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| 539 | hdivb(:,:,:) = hdivn(:,:,:) ! set the before to the now value |
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| 540 | rotb (:,:,:) = rotn (:,:,:) ! set the before to the now value |
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[508] | 541 | ! |
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[3] | 542 | END SUBROUTINE istate_uvg |
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| 543 | |
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| 544 | !!===================================================================== |
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| 545 | END MODULE istate |
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