[3] | 1 | MODULE domstp |
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| 2 | !!============================================================================== |
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| 3 | !! *** MODULE domstp *** |
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| 4 | !! Ocean initialization : time domain |
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| 5 | !!============================================================================== |
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| 6 | |
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| 7 | !!---------------------------------------------------------------------- |
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| 8 | !! dom_stp : ocean time domain initialization |
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| 9 | !!---------------------------------------------------------------------- |
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[2715] | 10 | !! History : OPA ! 1990-10 (O. Marti) Original code |
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| 11 | !! ! 1996-01 (G. Madec) terrain following coordinates |
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| 12 | !! NEMO 1.0 ! 2002-08 (G. Madec) F90: Free form and module |
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[454] | 13 | !!---------------------------------------------------------------------- |
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[2715] | 14 | USE oce ! ocean dynamics and tracers |
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| 15 | USE dom_oce ! ocean space and time domain |
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| 16 | USE in_out_manager ! I/O manager |
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| 17 | USE lib_mpp ! MPP library |
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[3] | 18 | |
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| 19 | IMPLICIT NONE |
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| 20 | PRIVATE |
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| 21 | |
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[2715] | 22 | PUBLIC dom_stp ! routine called by inidom.F90 |
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[3] | 23 | |
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| 24 | !! * Substitutions |
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| 25 | # include "domzgr_substitute.h90" |
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| 26 | !!---------------------------------------------------------------------- |
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[2528] | 27 | !! NEMO/OPA 3.3 , NEMO Consortium (2010) |
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[7959] | 28 | !! $Id$ |
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[2715] | 29 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
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[3] | 30 | !!---------------------------------------------------------------------- |
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| 31 | CONTAINS |
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| 32 | |
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| 33 | SUBROUTINE dom_stp |
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| 34 | !!---------------------------------------------------------------------- |
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| 35 | !! *** ROUTINE dom_stp *** |
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| 36 | !! |
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| 37 | !! ** Purpose : Intialize ocean time step for the run |
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| 38 | !! |
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| 39 | !! ** Method : - Initialization of a coef. use in the Asselin time |
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| 40 | !! filter: atfp1 = 1 - 2 * atfp where atfp is the Asselin time |
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| 41 | !! filter parameter read in namelist |
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| 42 | !! - Model time step: |
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| 43 | !! nacc = 0 : synchronous time intergration. |
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| 44 | !! There is one time step only, defined by: rdt, rdttra(k)=rdt |
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| 45 | !! nacc = 1 : accelerating the convergence. There is 2 different |
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| 46 | !! time steps for dynamics and tracers: |
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| 47 | !! rdt : dynamical part |
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| 48 | !! rdttra(k): temperature and salinity |
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| 49 | !! The tracer time step is a function of vertical level. the model |
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| 50 | !! reference time step ( i.e. for wind stress, surface heat and |
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| 51 | !! salt fluxes) is the surface tracer time step is rdttra(1). |
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| 52 | !! N.B. depth dependent acceleration of convergence is not im- |
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| 53 | !! plemented for s-coordinate. |
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| 54 | !! |
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| 55 | !! ** Action : - rdttra : vertical profile of tracer time step |
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| 56 | !! - atfp1 : = 1 - 2*atfp |
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| 57 | !! |
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[2715] | 58 | !! References : Bryan, K., 1984, J. Phys. Oceanogr., 14, 666-673. |
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[3] | 59 | !!---------------------------------------------------------------------- |
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| 60 | INTEGER :: jk ! dummy loop indice |
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| 61 | !!---------------------------------------------------------------------- |
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| 62 | |
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| 63 | IF(lwp) THEN |
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| 64 | WRITE(numout,*) |
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| 65 | WRITE(numout,*) 'dom_stp : time stepping setting' |
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| 66 | WRITE(numout,*) '~~~~~~~' |
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| 67 | ENDIF |
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| 68 | |
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| 69 | ! 0. Asselin Time filter |
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| 70 | ! ---------------------- |
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| 71 | |
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| 72 | atfp1 = 1. - 2. * atfp |
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| 73 | |
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| 74 | SELECT CASE ( nacc ) |
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| 75 | |
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| 76 | CASE ( 0 ) ! Synchronous time stepping |
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| 77 | IF(lwp) WRITE(numout,*)' synchronous time stepping' |
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| 78 | IF(lwp) WRITE(numout,*)' dynamics and tracer time step = ', rdt/3600., ' hours' |
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| 79 | |
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| 80 | rdttra(:) = rdt |
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| 81 | |
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| 82 | CASE ( 1 ) ! Accelerating the convergence |
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| 83 | IF(lwp) WRITE(numout,*) ' no tracer damping in the turbocline' |
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| 84 | IF(lwp) WRITE(numout,*)' accelerating the convergence' |
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| 85 | IF(lwp) WRITE(numout,*)' dynamics time step = ', rdt/3600., ' hours' |
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[592] | 86 | IF( ln_sco .AND. rdtmin /= rdtmax .AND. lk_vvl ) & |
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| 87 | & CALL ctl_stop ( ' depth dependent acceleration of convergence not implemented in s-coordinates & |
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| 88 | & nor in variable volume' ) |
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[3] | 89 | IF(lwp) WRITE(numout,*)' tracers time step : dt (hours) level' |
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| 90 | |
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| 91 | DO jk = 1, jpk |
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[4292] | 92 | IF( gdept_1d(jk) <= rdth ) rdttra(jk) = rdtmin |
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| 93 | IF( gdept_1d(jk) > rdth ) THEN |
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[3] | 94 | rdttra(jk) = rdtmin + ( rdtmax - rdtmin ) & |
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[4292] | 95 | * ( EXP( ( gdept_1d(jk ) - rdth ) / rdth ) - 1. ) & |
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| 96 | / ( EXP( ( gdept_1d(jpk) - rdth ) / rdth ) - 1. ) |
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[3] | 97 | ENDIF |
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[454] | 98 | IF(lwp) WRITE(numout,"(36x,f5.2,5x,i3)") rdttra(jk)/3600., jk |
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[3] | 99 | END DO |
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| 100 | |
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| 101 | CASE DEFAULT ! E R R O R |
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| 102 | |
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[474] | 103 | WRITE(ctmp1,*) ' nacc value e r r o r, nacc= ',nacc |
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| 104 | CALL ctl_stop( ctmp1 ) |
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[3] | 105 | |
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| 106 | END SELECT |
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| 107 | |
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| 108 | END SUBROUTINE dom_stp |
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| 109 | |
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| 110 | !!====================================================================== |
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| 111 | END MODULE domstp |
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