[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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| 6 | |
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| 7 | !!---------------------------------------------------------------------- |
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| 8 | !! istate_init : initial state setting |
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| 9 | !! istate_tem : analytical profile for initial Temperature |
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| 10 | !! istate_sal : analytical profile for initial Salinity |
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| 11 | !! istate_eel : initial state setting of EEL R5 configuration |
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[93] | 12 | !! istate_gyre : initial state setting of GYRE configuration |
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[3] | 13 | !! istate_uvg : initial velocity in geostropic balance |
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| 14 | !!---------------------------------------------------------------------- |
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| 15 | !! * Modules used |
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| 16 | USE oce ! ocean dynamics and active tracers |
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| 17 | USE dom_oce ! ocean space and time domain |
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| 18 | USE daymod ! |
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| 19 | USE ldftra_oce ! ocean active tracers: lateral physics |
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| 20 | USE zdf_oce ! ocean vertical physics |
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| 21 | USE in_out_manager ! I/O manager |
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| 22 | USE phycst ! physical constants |
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| 23 | USE wzvmod ! verctical velocity (wzv routine) |
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| 24 | USE dtatem ! temperature data (dta_tem routine) |
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| 25 | USE dtasal ! salinity data (dta_sal routine) |
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| 26 | USE restart ! ocean restart (rst_read routine) |
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| 27 | USE solisl ! ??? |
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| 28 | |
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| 29 | IMPLICIT NONE |
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| 30 | PRIVATE |
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| 31 | |
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| 32 | !! * Routine accessibility |
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| 33 | PUBLIC istate_init ! routine called by step.F90 |
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| 34 | |
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| 35 | !! * Substitutions |
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| 36 | # include "domzgr_substitute.h90" |
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| 37 | # include "vectopt_loop_substitute.h90" |
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| 38 | !!---------------------------------------------------------------------- |
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[247] | 39 | !! OPA 9.0 , LOCEAN-IPSL (2005) |
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| 40 | !! $Header$ |
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| 41 | !! This software is governed by the CeCILL licence see modipsl/doc/NEMO_CeCILL.txt |
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[3] | 42 | !!---------------------------------------------------------------------- |
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| 43 | |
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| 44 | CONTAINS |
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| 45 | |
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| 46 | SUBROUTINE istate_init |
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| 47 | !!---------------------------------------------------------------------- |
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| 48 | !! *** ROUTINE istate_init *** |
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| 49 | !! |
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| 50 | !! ** Purpose : Initialization of the dynamics and tracers. |
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| 51 | !! |
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| 52 | !! ** Method : |
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| 53 | !! |
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| 54 | !! History : |
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| 55 | !! 4.0 ! 91-03 () Original code |
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| 56 | !! ! 91-11 (G. Madec) |
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| 57 | !! 9.0 ! 03-09 (G. Madec) F90: Free form, modules, orthogonality |
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| 58 | !!---------------------------------------------------------------------- |
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| 59 | !! * Local declarations |
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| 60 | !!---------------------------------------------------------------------- |
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| 61 | |
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| 62 | |
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| 63 | ! Initialization to zero |
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| 64 | ! ---------------------- |
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| 65 | |
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| 66 | ! before fields ! now fields ! after fields ! |
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| 67 | ; ub (:,:,:) = 0.e0 ; un (:,:,:) = 0.e0 ; ua (:,:,:) = 0.e0 |
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| 68 | ; vb (:,:,:) = 0.e0 ; vn (:,:,:) = 0.e0 ; va (:,:,:) = 0.e0 |
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| 69 | ; ; wn (:,:,:) = 0.e0 ; |
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| 70 | ; rotb (:,:,:) = 0.e0 ; rotn (:,:,:) = 0.e0 ; |
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| 71 | ; hdivb(:,:,:) = 0.e0 ; hdivn(:,:,:) = 0.e0 ; |
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| 72 | |
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| 73 | ; tb (:,:,:) = 0.e0 ; tn (:,:,:) = 0.e0 ; ta (:,:,:) = 0.e0 |
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| 74 | ; sb (:,:,:) = 0.e0 ; sn (:,:,:) = 0.e0 ; sa (:,:,:) = 0.e0 |
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| 75 | |
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| 76 | rhd (:,:,:) = 0.e0 |
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| 77 | rhop (:,:,:) = 0.e0 |
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| 78 | rn2 (:,:,:) = 0.e0 |
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| 79 | |
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[15] | 80 | #if defined key_dynspg_rl |
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| 81 | ! rigid-lid formulation |
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| 82 | bsfb(:,:) = 0.e0 ! before barotropic stream-function |
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| 83 | bsfn(:,:) = 0.e0 ! now barotropic stream-function |
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| 84 | bsfd(:,:) = 0.e0 ! barotropic stream-function trend |
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[359] | 85 | #endif |
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| 86 | ! free surface formulation |
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| 87 | sshb(:,:) = 0.e0 ! before sea-surface height |
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| 88 | sshn(:,:) = 0.e0 ! now sea-surface height |
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[3] | 89 | |
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[15] | 90 | |
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| 91 | IF( ln_rstart ) THEN ! Restart from a file |
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[3] | 92 | ! ! ------------------- |
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| 93 | neuler = 1 ! Set time-step indicator at nit000 (leap-frog) |
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| 94 | CALL rst_read ! Read the restart file |
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| 95 | ELSE |
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| 96 | ! ! Start from rest |
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| 97 | ! ! --------------- |
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| 98 | neuler = 0 ! Set time-step indicator at nit000 (euler forward) |
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| 99 | adatrj = 0._wp |
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| 100 | IF( cp_cfg == 'eel' ) THEN |
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[93] | 101 | CALL istate_eel ! EEL configuration : start from pre-defined |
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| 102 | ! ! velocity and thermohaline fields |
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| 103 | ELSEIF( cp_cfg == 'gyre') THEN |
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| 104 | CALL istate_gyre ! GYRE configuration : start from pre-defined temperature |
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| 105 | ! ! and salinity fields |
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[3] | 106 | ELSE |
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[93] | 107 | ! ! Other configurations: Initial temperature and salinity fields |
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[3] | 108 | #if defined key_dtatem |
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| 109 | CALL dta_tem( nit000 ) ! read 3D temperature data |
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| 110 | tb(:,:,:) = t_dta(:,:,:) ! use temperature data read |
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| 111 | tn(:,:,:) = t_dta(:,:,:) |
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| 112 | #else |
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| 113 | IF(lwp) WRITE(numout,*) ! analytical temperature profile |
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| 114 | IF(lwp) WRITE(numout,*)' Temperature initialization using an analytic profile' |
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| 115 | CALL istate_tem |
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| 116 | #endif |
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| 117 | #if defined key_dtasal |
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| 118 | CALL dta_sal( nit000 ) ! read 3D salinity data |
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| 119 | sb(:,:,:) = s_dta(:,:,:) ! use salinity data read |
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| 120 | sn(:,:,:) = s_dta(:,:,:) |
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| 121 | #else |
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| 122 | ! No salinity data |
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| 123 | IF(lwp)WRITE(numout,*) ! analytical salinity profile |
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| 124 | IF(lwp)WRITE(numout,*)' Salinity initialisation using a constant value' |
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| 125 | CALL istate_sal |
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| 126 | #endif |
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| 127 | ENDIF |
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| 128 | |
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| 129 | ENDIF |
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| 130 | ! ! Vertical velocity |
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| 131 | ! ! ----------------- |
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| 132 | CALL wzv( nit000 ) ! from horizontal divergence |
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| 133 | |
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| 134 | END SUBROUTINE istate_init |
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| 135 | |
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| 136 | |
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| 137 | SUBROUTINE istate_tem |
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| 138 | !!--------------------------------------------------------------------- |
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| 139 | !! *** ROUTINE istate_tem *** |
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| 140 | !! |
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| 141 | !! ** Purpose : Intialization of the temperature field with an |
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| 142 | !! analytical profile or a file (i.e. in EEL configuration) |
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| 143 | !! |
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| 144 | !! ** Method : Use Philander analytic profile of temperature |
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| 145 | !! |
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| 146 | !! References : Philander ??? |
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| 147 | !! |
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| 148 | !! History : |
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| 149 | !! 4.0 ! 89-12 (P. Andrich) Original code |
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| 150 | !! 6.0 ! 96-01 (G. Madec) terrain following coordinates |
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| 151 | !! 9.0 ! 02-09 (G. Madec) F90: Free form |
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| 152 | !!---------------------------------------------------------------------- |
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| 153 | !! * Local declarations |
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| 154 | INTEGER :: ji, jj, jk |
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| 155 | !!---------------------------------------------------------------------- |
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| 156 | |
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| 157 | IF(lwp) WRITE(numout,*) |
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| 158 | IF(lwp) WRITE(numout,*) 'istate_tem : initial temperature profile' |
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| 159 | IF(lwp) WRITE(numout,*) '~~~~~~~~~~' |
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| 160 | |
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| 161 | DO jk = 1, jpk |
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| 162 | DO jj = 1, jpj |
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| 163 | DO ji = 1, jpi |
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| 164 | tn(ji,jj,jk) = ( ( ( 7.5 - 0.*ABS(gphit(ji,jj))/30. ) & |
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[15] | 165 | & *( 1.-TANH((fsdept(ji,jj,jk)-80.)/30.) ) & |
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| 166 | & + 10.*(5000.-fsdept(ji,jj,jk))/5000.) ) * tmask(ji,jj,jk) |
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[3] | 167 | tb(ji,jj,jk) = tn(ji,jj,jk) |
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| 168 | END DO |
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| 169 | END DO |
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| 170 | END DO |
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| 171 | |
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[79] | 172 | IF(lwp) CALL prizre( tn , jpi , jpj , jpk , jpj/2 , & |
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| 173 | & 1 , jpi , 5 , 1 , jpk , & |
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| 174 | & 1 , 1. , numout ) |
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[3] | 175 | |
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| 176 | END SUBROUTINE istate_tem |
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| 177 | |
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| 178 | |
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| 179 | SUBROUTINE istate_sal |
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| 180 | !!--------------------------------------------------------------------- |
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| 181 | !! *** ROUTINE istate_sal *** |
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| 182 | !! |
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| 183 | !! ** Purpose : Intialize the salinity field with an analytic profile |
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| 184 | !! |
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| 185 | !! ** Method : Use to a constant value 35.5 |
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| 186 | !! |
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| 187 | !! ** Action : Initialize sn and sb |
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| 188 | !! |
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| 189 | !! History : |
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| 190 | !! 4.0 ! 89-12 (P. Andrich) Original code |
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| 191 | !! 8.5 ! 02-09 (G. Madec) F90: Free form |
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| 192 | !!---------------------------------------------------------------------- |
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| 193 | !! * Local declarations |
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| 194 | REAL(wp) :: zsal = 35.50_wp |
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| 195 | !!---------------------------------------------------------------------- |
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| 196 | |
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| 197 | IF(lwp) WRITE(numout,*) |
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| 198 | IF(lwp) WRITE(numout,*) 'istate_sal : initial salinity : ', zsal |
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| 199 | IF(lwp) WRITE(numout,*) '~~~~~~~~~~' |
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| 200 | |
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| 201 | sn(:,:,:) = zsal * tmask(:,:,:) |
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| 202 | sb(:,:,:) = sn(:,:,:) |
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| 203 | |
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| 204 | END SUBROUTINE istate_sal |
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| 205 | |
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| 206 | |
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| 207 | SUBROUTINE istate_eel |
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| 208 | !!---------------------------------------------------------------------- |
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| 209 | !! *** ROUTINE istate_eel *** |
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| 210 | !! |
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| 211 | !! ** Purpose : Initialization of the dynamics and tracers for EEL R5 |
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| 212 | !! configuration (channel with or without a topographic bump) |
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| 213 | !! |
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| 214 | !! ** Method : - set temprature field |
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| 215 | !! - set salinity field |
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| 216 | !! - set velocity field including horizontal divergence |
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| 217 | !! and relative vorticity fields |
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| 218 | !! |
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| 219 | !! History : |
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| 220 | !! 8.0 ! 01-09 (M. Levy, M. Ben Jelloul) read file for EEL 2 & 6 |
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| 221 | !! 9.0 ! 03-09 (G. Madec, C. Talandier) EEL 5 |
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[359] | 222 | !! 9.0 ! 05-11 (V. Garnier) Surface pressure gradient organization |
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[3] | 223 | !!---------------------------------------------------------------------- |
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| 224 | !! * Modules used |
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| 225 | USE eosbn2 ! eq. of state, Brunt Vaisala frequency (eos routine) |
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| 226 | USE divcur ! hor. divergence & rel. vorticity (div_cur routine) |
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| 227 | USE ioipsl |
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| 228 | |
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| 229 | !! * Local declarations |
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| 230 | LOGICAL :: llog |
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| 231 | CHARACTER (len=21) :: & |
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| 232 | clname = 'eel.initemp', & ! filename (for EEL R2 or R6) |
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| 233 | clvar = 'initemp' ! variable name |
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| 234 | INTEGER :: inum ! temporary logical unit |
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| 235 | INTEGER :: ji, jj, jk ! dummy loop indices |
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| 236 | INTEGER :: ilev, itime ! temporary integers |
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| 237 | REAL(wp) :: & |
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| 238 | zh1, zh2, zslope, zcst ! temporary scalars |
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| 239 | REAL(wp) :: & |
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[359] | 240 | zt1 = 12._wp, & ! surface temperature value (EEL R5) |
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| 241 | zt2 = 2._wp, & ! bottom temperature value (EEL R5) |
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| 242 | zsal = 35.5_wp ! constant salinity (EEL R2, R5 and R6) |
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[3] | 243 | REAL(wp) :: & |
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| 244 | zdt, zdate0 ! temporary scalars |
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| 245 | REAL(wp), DIMENSION(jpk) :: & |
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| 246 | zdept ! temporary workspace |
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| 247 | REAL(wp), DIMENSION(jpiglo,jpjglo) :: & |
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| 248 | zlamt, zphit ! temporary workspace |
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[359] | 249 | # if ! defined key_dynspg_rl |
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[3] | 250 | REAL(wp), DIMENSION(jpiglo,jpjglo) :: & |
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| 251 | zssh ! initial ssh over the global domain |
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| 252 | # endif |
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| 253 | !!---------------------------------------------------------------------- |
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| 254 | |
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| 255 | SELECT CASE ( jp_cfg ) |
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| 256 | ! ! ==================== |
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| 257 | CASE ( 5 ) ! EEL R5 configuration |
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| 258 | ! ! ==================== |
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| 259 | |
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| 260 | ! set temperature field with a linear profile |
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| 261 | ! ------------------------------------------- |
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| 262 | IF(lwp) WRITE(numout,*) |
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| 263 | IF(lwp) WRITE(numout,*) 'istate_eel : EEL R5: linear temperature profile' |
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| 264 | IF(lwp) WRITE(numout,*) '~~~~~~~~~~' |
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| 265 | |
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| 266 | zh1 = gdept( 1 ) |
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| 267 | zh2 = gdept(jpkm1) |
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| 268 | |
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| 269 | zslope = ( zt1 - zt2 ) / ( zh1 - zh2 ) |
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| 270 | zcst = ( zt1 * ( zh1 - zh2) - ( zt1 - zt2 ) * zh1 ) / ( zh1 - zh2 ) |
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| 271 | |
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| 272 | DO jk = 1, jpk |
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| 273 | tn(:,:,jk) = ( zslope * fsdept(:,:,jk) + zcst ) * tmask(:,:,jk) |
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| 274 | tb(:,:,jk) = tn(:,:,jk) |
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| 275 | END DO |
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| 276 | |
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| 277 | IF(lwp) CALL prizre( tn , jpi , jpj , jpk , jpj/2 , & |
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| 278 | & 1 , jpi , 5 , 1 , jpk , & |
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| 279 | & 1 , 1. , numout ) |
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| 280 | |
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| 281 | ! set salinity field to a constant value |
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| 282 | ! -------------------------------------- |
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| 283 | IF(lwp) WRITE(numout,*) |
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| 284 | IF(lwp) WRITE(numout,*) 'istate_eel : EEL R5: constant salinity field, S = ', zsal |
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| 285 | IF(lwp) WRITE(numout,*) '~~~~~~~~~~' |
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| 286 | |
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| 287 | sn(:,:,:) = zsal * tmask(:,:,:) |
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| 288 | sb(:,:,:) = sn(:,:,:) |
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| 289 | |
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| 290 | |
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[359] | 291 | # if ! defined key_dynspg_rl |
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[3] | 292 | ! set the dynamics: U,V, hdiv, rot (and ssh if necessary) |
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| 293 | ! ---------------- |
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| 294 | ! Start EEL5 configuration with barotropic geostrophic velocities |
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| 295 | ! according the sshb and sshn SSH imposed. |
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| 296 | ub(:,:,:) = 0.1 * umask(:,:,:) |
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| 297 | un(:,:,:) = ub(:,:,:) |
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| 298 | |
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| 299 | DO jj = 1, jpjglo |
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[15] | 300 | zssh(:,jj) = ( .22 - ( FLOAT(jj-3) * (0.44) ) / 99. ) |
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[3] | 301 | END DO |
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| 302 | DO jj = 1, nlcj |
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| 303 | DO ji = 1, nlci |
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| 304 | sshb(ji,jj) = zssh( mig(ji) , mjg(jj) ) * tmask(ji,jj,1) |
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| 305 | END DO |
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| 306 | END DO |
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| 307 | sshb(nlci+1:jpi, : ) = 0.e0 ! set to zero extra mpp columns |
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| 308 | sshb( : ,nlcj+1:jpj) = 0.e0 ! set to zero extra mpp rows |
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| 309 | |
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| 310 | sshn(:,:) = sshb(:,:) ! set now ssh to the before value |
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| 311 | |
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| 312 | ! horizontal divergence and relative vorticity (curl) |
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| 313 | CALL div_cur( nit000 ) |
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| 314 | |
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| 315 | ! N.B. the vertical velocity will be computed from the horizontal divergence field |
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| 316 | ! in istate by a call to wzv routine |
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| 317 | # endif |
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| 318 | |
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| 319 | |
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| 320 | ! ! ========================== |
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| 321 | CASE ( 2 , 6 ) ! EEL R2 or R6 configuration |
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| 322 | ! ! ========================== |
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| 323 | |
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| 324 | ! set temperature field with a NetCDF file |
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| 325 | ! ---------------------------------------- |
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| 326 | IF(lwp) WRITE(numout,*) |
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| 327 | IF(lwp) WRITE(numout,*) 'istate_eel : EEL R2 or R6: read initial temperature in a NetCDF file' |
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| 328 | IF(lwp) WRITE(numout,*) '~~~~~~~~~~' |
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| 329 | |
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| 330 | itime = 0 |
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| 331 | clname = 'eel.initemp' |
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[389] | 332 | #if defined key_AGRIF |
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| 333 | if ( .NOT. Agrif_Root() ) then |
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| 334 | clname = TRIM(Agrif_CFixed())//'_'//TRIM(clname) |
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| 335 | endif |
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| 336 | #endif |
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[3] | 337 | llog = .FALSE. |
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| 338 | ilev = jpk |
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| 339 | zlamt(:,:) = 0.e0 |
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| 340 | zphit(:,:) = 0.e0 |
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| 341 | CALL restini( clname, jpidta, jpjdta, zlamt , zphit , & |
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| 342 | & ilev , zdept , clname, itime , zdate0, & |
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[352] | 343 | & zdt , inum , domain_id=nidom ) |
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[3] | 344 | CALL restget( inum , 'initemp', jpi, jpj, jpk, & |
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| 345 | & 0 , llog , tb ) ! read before temprature (tb) |
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| 346 | CALL restclo( inum ) |
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| 347 | |
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| 348 | tn(:,:,:) = tb(:,:,:) ! set nox temperature to tb |
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| 349 | |
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| 350 | IF(lwp) WRITE(numout,*) ' file name : ', clname |
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| 351 | IF(lwp) CALL prizre( tn , jpi , jpj , jpk , jpj/2 , & |
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| 352 | & 1 , jpi , 5 , 1 , jpk , & |
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| 353 | & 1 , 1. , numout ) |
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| 354 | |
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| 355 | |
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| 356 | ! set salinity field to a constant value |
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| 357 | ! -------------------------------------- |
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| 358 | IF(lwp) WRITE(numout,*) |
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| 359 | IF(lwp) WRITE(numout,*) 'istate_eel : EEL R5: constant salinity field, S = ', zsal |
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| 360 | IF(lwp) WRITE(numout,*) '~~~~~~~~~~' |
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| 361 | |
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| 362 | sn(:,:,:) = zsal * tmask(:,:,:) |
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| 363 | sb(:,:,:) = sn(:,:,:) |
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| 364 | |
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| 365 | |
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[79] | 366 | IF( lk_isl ) THEN |
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[3] | 367 | ! Horizontal velocity : start from geostrophy (EEL config) |
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| 368 | CALL eos( tn, sn, rhd ) ! now in situ density |
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| 369 | CALL istate_uvg ! compute geostrophic velocity |
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| 370 | |
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| 371 | ! N.B. the vertical velocity will be computed from the horizontal divergence field |
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| 372 | ! in istate by a call to wzv routine |
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| 373 | ENDIF |
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| 374 | ! ! =========================== |
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| 375 | CASE DEFAULT ! NONE existing configuration |
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| 376 | ! ! =========================== |
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| 377 | IF(lwp) WRITE(numout,cform_err) |
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| 378 | IF(lwp) WRITE(numout,*) 'EEL with a ', jp_cfg,' km resolution is not coded' |
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| 379 | nstop = nstop +1 |
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| 380 | END SELECT |
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| 381 | |
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| 382 | END SUBROUTINE istate_eel |
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| 383 | |
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| 384 | |
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[93] | 385 | SUBROUTINE istate_gyre |
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| 386 | !!---------------------------------------------------------------------- |
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| 387 | !! *** ROUTINE istate_gyre *** |
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| 388 | !! |
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| 389 | !! ** Purpose : Initialization of the dynamics and tracers for GYRE |
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| 390 | !! configuration (double gyre with rotated domain) |
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| 391 | !! |
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| 392 | !! ** Method : - set temprature field |
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| 393 | !! - set salinity field |
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| 394 | !! |
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| 395 | !! ** History : |
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| 396 | !! 9.0 ! 04-05 (A. Koch-Larrouy) Original code |
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| 397 | !!---------------------------------------------------------------------- |
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| 398 | !! * Local variables |
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| 399 | INTEGER :: ji, jj, jk ! dummy loop indices |
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| 400 | !!---------------------------------------------------------------------- |
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| 401 | |
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| 402 | IF(lwp) WRITE(numout,*) |
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| 403 | IF(lwp) WRITE(numout,*) 'istate_gyre : initial analytical T and S profil deduced from LEVITUS ' |
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| 404 | IF(lwp) WRITE(numout,*) '~~~~~~~~~~~' |
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| 405 | |
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| 406 | DO jk = 1, jpk |
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| 407 | DO jj = 1, jpj |
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| 408 | DO ji = 1, jpi |
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| 409 | tn(ji,jj,jk) = ( 16. - 12. * TANH( (fsdept(ji,jj,jk) - 400) / 700 ) ) & |
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| 410 | & * (-TANH( (500-fsdept(ji,jj,jk)) / 150 ) + 1) / 2 & |
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| 411 | & + ( 15. * ( 1. - TANH( (fsdept(ji,jj,jk)-50.) / 1500.) ) & |
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| 412 | & - 1.4 * TANH((fsdept(ji,jj,jk)-100.) / 100.) & |
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| 413 | & + 7. * (1500. - fsdept(ji,jj,jk)) / 1500. ) & |
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| 414 | & * (-TANH( (fsdept(ji,jj,jk) - 500) / 150) + 1) / 2 |
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| 415 | tn(ji,jj,jk) = tn(ji,jj,jk) * tmask(ji,jj,jk) |
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| 416 | tb(ji,jj,jk) = tn(ji,jj,jk) |
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| 417 | |
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| 418 | sn(ji,jj,jk) = ( 36.25 - 1.13 * TANH( (fsdept(ji,jj,jk) - 305) / 460 ) ) & |
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| 419 | & * (-TANH((500 - fsdept(ji,jj,jk)) / 150) + 1) / 2 & |
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| 420 | & + ( 35.55 + 1.25 * (5000. - fsdept(ji,jj,jk)) / 5000. & |
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| 421 | & - 1.62 * TANH( (fsdept(ji,jj,jk) - 60. ) / 650. ) & |
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| 422 | & + 0.2 * TANH( (fsdept(ji,jj,jk) - 35. ) / 100. ) & |
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| 423 | & + 0.2 * TANH( (fsdept(ji,jj,jk) - 1000.) / 5000.) ) & |
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| 424 | & * (-TANH((fsdept(ji,jj,jk) - 500) / 150) + 1) / 2 |
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| 425 | sn(ji,jj,jk) = sn(ji,jj,jk) * tmask(ji,jj,jk) |
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| 426 | sb(ji,jj,jk) = sn(ji,jj,jk) |
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| 427 | END DO |
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| 428 | END DO |
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| 429 | END DO |
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| 430 | |
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| 431 | IF(lwp) THEN |
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| 432 | WRITE(numout,*) |
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| 433 | WRITE(numout,*) ' Initial temperature and salinity profiles:' |
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| 434 | WRITE(numout, "(9x,' level gdept temperature salinity ')" ) |
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| 435 | WRITE(numout, "(10x, i4, 3f10.2)" ) ( jk, gdept(jk), tn(2,2,jk), sn(2,2,jk), jk = 1, jpk ) |
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| 436 | ENDIF |
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| 437 | |
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| 438 | |
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| 439 | END SUBROUTINE istate_gyre |
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| 440 | |
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| 441 | |
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| 442 | |
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[3] | 443 | SUBROUTINE istate_uvg |
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| 444 | !!---------------------------------------------------------------------- |
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| 445 | !! *** ROUTINE istate_uvg *** |
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| 446 | !! |
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| 447 | !! ** Purpose : Compute the geostrophic velocities from (tn,sn) fields |
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| 448 | !! |
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| 449 | !! ** Method : Using the hydrostatic hypothesis the now hydrostatic |
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| 450 | !! pressure is computed by integrating the in-situ density from the |
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| 451 | !! surface to the bottom. |
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| 452 | !! p=integral [ rau*g dz ] |
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| 453 | !! |
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| 454 | !! History : |
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| 455 | !! 8.1 ! 01-09 (M. Levy, M. Ben Jelloul) Original code |
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| 456 | !! 8.5 ! 02-09 (G. Madec) F90: Free form |
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[359] | 457 | !! 9.0 ! 05-11 (V. Garnier) Surface pressure gradient organization |
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[3] | 458 | !!---------------------------------------------------------------------- |
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| 459 | !! * Modules used |
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| 460 | USE eosbn2 ! eq. of state, Brunt Vaisala frequency (eos routine) |
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[359] | 461 | USE dynspg ! surface pressure gradient (dyn_spg routine) |
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[3] | 462 | USE divcur ! hor. divergence & rel. vorticity (div_cur routine) |
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| 463 | USE lbclnk ! ocean lateral boundary condition (or mpp link) |
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| 464 | |
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| 465 | !! * Local declarations |
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| 466 | INTEGER :: ji, jj, jk ! dummy loop indices |
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| 467 | INTEGER :: indic ! ??? |
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| 468 | REAL(wp) :: & |
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| 469 | zmsv, zphv, zmsu, zphu, & ! temporary scalars |
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| 470 | zalfg |
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| 471 | REAL(wp), DIMENSION (jpi,jpj,jpk) :: & |
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| 472 | zprn ! workspace |
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| 473 | !!---------------------------------------------------------------------- |
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| 474 | |
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| 475 | IF(lwp) WRITE(numout,*) |
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| 476 | IF(lwp) WRITE(numout,*) 'istate_uvg : Start from Geostrophy' |
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| 477 | IF(lwp) WRITE(numout,*) '~~~~~~~~~~' |
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| 478 | |
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| 479 | ! Compute the now hydrostatic pressure |
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| 480 | ! ------------------------------------ |
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| 481 | |
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[15] | 482 | zalfg = 0.5 * grav * rau0 |
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[3] | 483 | ! Surface value |
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| 484 | zprn(:,:,1) = zalfg * fse3w(:,:,1) * ( 1 + rhd(:,:,1) ) |
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| 485 | |
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| 486 | ! Vertical integration from the surface |
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| 487 | DO jk = 2, jpkm1 |
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| 488 | zprn(:,:,jk) = zprn(:,:,jk-1) & |
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[359] | 489 | & + zalfg * fse3w(:,:,jk) * ( 2. + rhd(:,:,jk) + rhd(:,:,jk-1) ) |
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[3] | 490 | END DO |
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| 491 | |
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| 492 | ! Compute geostrophic balance |
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| 493 | ! --------------------------- |
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| 494 | |
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| 495 | DO jk = 1, jpkm1 |
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| 496 | DO jj = 2, jpjm1 |
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| 497 | DO ji = fs_2, fs_jpim1 ! vertor opt. |
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| 498 | zmsv = 1. / MAX( umask(ji-1,jj+1,jk) + umask(ji ,jj+1,jk) & |
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| 499 | + umask(ji-1,jj ,jk) + umask(ji ,jj ,jk) , 1. ) |
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| 500 | 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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| 501 | + ( zprn(ji+1,jj+1,jk) - zprn(ji ,jj+1,jk) ) * umask(ji ,jj+1,jk) / e1u(ji ,jj+1) & |
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| 502 | + ( zprn(ji ,jj ,jk) - zprn(ji-1,jj ,jk) ) * umask(ji-1,jj ,jk) / e1u(ji-1,jj ) & |
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| 503 | + ( zprn(ji+1,jj ,jk) - zprn(ji ,jj ,jk) ) * umask(ji ,jj ,jk) / e1u(ji ,jj ) |
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| 504 | zphv = 1. / rau0 * zphv * zmsv * vmask(ji,jj,jk) |
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| 505 | |
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| 506 | zmsu = 1. / MAX( vmask(ji+1,jj ,jk) + vmask(ji ,jj ,jk) & |
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| 507 | + vmask(ji+1,jj-1,jk) + vmask(ji ,jj-1,jk) , 1. ) |
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| 508 | 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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| 509 | + ( zprn(ji ,jj+1,jk) - zprn(ji ,jj ,jk) ) * vmask(ji ,jj ,jk) / e2v(ji ,jj ) & |
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| 510 | + ( 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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| 511 | + ( zprn(ji ,jj ,jk) - zprn(ji ,jj-1,jk) ) * vmask(ji ,jj-1,jk) / e2v(ji ,jj-1) |
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| 512 | zphu = 1. / rau0 * zphu * zmsu * umask(ji,jj,jk) |
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| 513 | |
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| 514 | ! Compute the geostrophic velocities |
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| 515 | un(ji,jj,jk) = -2. * zphu / ( ff(ji,jj) + ff(ji ,jj-1) ) |
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| 516 | vn(ji,jj,jk) = 2. * zphv / ( ff(ji,jj) + ff(ji-1,jj ) ) |
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| 517 | END DO |
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| 518 | END DO |
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| 519 | END DO |
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| 520 | |
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| 521 | IF(lwp) WRITE(numout,*) ' we force to zero bottom velocity' |
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| 522 | |
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| 523 | ! Susbtract the bottom velocity (level jpk-1 for flat bottom case) |
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| 524 | ! to have a zero bottom velocity |
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| 525 | |
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| 526 | DO jk = 1, jpkm1 |
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| 527 | un(:,:,jk) = ( un(:,:,jk) - un(:,:,jpkm1) ) * umask(:,:,jk) |
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| 528 | vn(:,:,jk) = ( vn(:,:,jk) - vn(:,:,jpkm1) ) * vmask(:,:,jk) |
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| 529 | END DO |
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| 530 | |
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| 531 | CALL lbc_lnk( un, 'U', -1. ) |
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| 532 | CALL lbc_lnk( vn, 'V', -1. ) |
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| 533 | |
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| 534 | ub(:,:,:) = un(:,:,:) |
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| 535 | vb(:,:,:) = vn(:,:,:) |
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| 536 | |
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| 537 | ! WARNING !!!!! |
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| 538 | ! after initializing u and v, we need to calculate the initial streamfunction bsf. |
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| 539 | ! Otherwise, only the trend will be computed and the model will blow up (inconsistency). |
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| 540 | |
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| 541 | ! to do that, we call dyn_spg with a special trick: |
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| 542 | ! we fill ua and va with the velocities divided by dt, |
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| 543 | ! and the streamfunction will be brought to the right |
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| 544 | ! value assuming the velocities have been set up in |
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| 545 | ! one time step. |
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| 546 | ! we then set bsfd to zero (first guess for next step |
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| 547 | ! is d(psi)/dt = 0.) |
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| 548 | |
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| 549 | ! sets up s false trend to calculate the barotropic |
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| 550 | ! streamfunction. |
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| 551 | |
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| 552 | ua(:,:,:) = ub(:,:,:) / rdt |
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| 553 | va(:,:,:) = vb(:,:,:) / rdt |
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| 554 | |
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[359] | 555 | ! calls dyn_spg. we assume euler time step, starting from rest. |
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[3] | 556 | indic = 0 |
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[359] | 557 | CALL dyn_spg( nit000, indic ) ! surface pressure gradient |
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[3] | 558 | |
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| 559 | ! the new velocity is ua*rdt |
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| 560 | |
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| 561 | CALL lbc_lnk( ua, 'U', -1. ) |
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| 562 | CALL lbc_lnk( va, 'V', -1. ) |
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| 563 | |
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| 564 | ub(:,:,:) = ua(:,:,:) * rdt |
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| 565 | vb(:,:,:) = va(:,:,:) * rdt |
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| 566 | ua(:,:,:) = 0.e0 |
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| 567 | va(:,:,:) = 0.e0 |
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| 568 | un(:,:,:) = ub(:,:,:) |
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| 569 | vn(:,:,:) = vb(:,:,:) |
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| 570 | |
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[79] | 571 | #if defined key_dynspg_rl |
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| 572 | IF( lk_isl ) bsfb(:,:) = bsfn(:,:) ! Put bsfb to zero |
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[3] | 573 | #endif |
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| 574 | |
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| 575 | ! Compute the divergence and curl |
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| 576 | |
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| 577 | CALL div_cur( nit000 ) ! now horizontal divergence and curl |
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| 578 | |
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| 579 | hdivb(:,:,:) = hdivn(:,:,:) ! set the before to the now value |
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| 580 | rotb (:,:,:) = rotn (:,:,:) ! set the before to the now value |
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| 581 | |
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| 582 | END SUBROUTINE istate_uvg |
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| 583 | |
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| 584 | !!===================================================================== |
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| 585 | END MODULE istate |
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