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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10 | !! * Modules used |
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11 | USE oce ! ocean dynamics and tracers |
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12 | USE dom_oce ! ocean space and time domain |
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13 | USE in_out_manager ! I/O manager |
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14 | |
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15 | IMPLICIT NONE |
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16 | PRIVATE |
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17 | |
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18 | !! * routine accessibility |
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19 | PUBLIC dom_stp ! routine called by inidom.F90 |
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20 | |
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21 | !! * Substitutions |
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22 | # include "domzgr_substitute.h90" |
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23 | !!---------------------------------------------------------------------- |
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24 | !! OPA 9.0 , LODYC-IPSL (2003) |
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25 | !!---------------------------------------------------------------------- |
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26 | |
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27 | CONTAINS |
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28 | |
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29 | SUBROUTINE dom_stp |
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30 | !!---------------------------------------------------------------------- |
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31 | !! *** ROUTINE dom_stp *** |
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32 | !! |
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33 | !! ** Purpose : Intialize ocean time step for the run |
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34 | !! |
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35 | !! ** Method : - Initialization of a coef. use in the Asselin time |
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36 | !! filter: atfp1 = 1 - 2 * atfp where atfp is the Asselin time |
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37 | !! filter parameter read in namelist |
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38 | !! - Model time step: |
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39 | !! nacc = 0 : synchronous time intergration. |
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40 | !! There is one time step only, defined by: rdt, rdttra(k)=rdt |
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41 | !! nacc = 1 : accelerating the convergence. There is 2 different |
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42 | !! time steps for dynamics and tracers: |
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43 | !! rdt : dynamical part |
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44 | !! rdttra(k): temperature and salinity |
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45 | !! The tracer time step is a function of vertical level. the model |
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46 | !! reference time step ( i.e. for wind stress, surface heat and |
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47 | !! salt fluxes) is the surface tracer time step is rdttra(1). |
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48 | !! N.B. depth dependent acceleration of convergence is not im- |
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49 | !! plemented for s-coordinate. |
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50 | !! |
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51 | !! ** Action : - rdttra : vertical profile of tracer time step |
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52 | !! - atfp1 : = 1 - 2*atfp |
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53 | !! |
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54 | !! References : |
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55 | !! Bryan, K., 1984, J. Phys. Oceanogr., 14, 666-673. |
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56 | !! |
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57 | !! History : |
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58 | !! ! 90-10 (O. Marti) Original code |
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59 | !! ! 96-01 (G. Madec) terrain following coordinates |
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60 | !! 8.5 ! 02-08 (G. Madec) F90: Free form and module |
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61 | !!---------------------------------------------------------------------- |
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62 | !! * Local declarations |
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63 | INTEGER :: jk ! dummy loop indice |
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64 | !!---------------------------------------------------------------------- |
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65 | |
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66 | IF(lwp) THEN |
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67 | WRITE(numout,*) |
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68 | WRITE(numout,*) 'dom_stp : time stepping setting' |
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69 | WRITE(numout,*) '~~~~~~~' |
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70 | ENDIF |
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71 | |
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72 | ! 0. Asselin Time filter |
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73 | ! ---------------------- |
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74 | |
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75 | atfp1 = 1. - 2. * atfp |
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76 | |
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77 | |
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78 | SELECT CASE ( nacc ) |
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79 | |
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80 | CASE ( 0 ) ! Synchronous time stepping |
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81 | IF(lwp) WRITE(numout,*)' synchronous time stepping' |
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82 | IF(lwp) WRITE(numout,*)' dynamics and tracer time step = ', rdt/3600., ' hours' |
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83 | |
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84 | rdttra(:) = rdt |
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85 | |
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86 | CASE ( 1 ) ! Accelerating the convergence |
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87 | IF(lwp) WRITE(numout,*) ' no tracer damping in the turbocline' |
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88 | IF(lwp) WRITE(numout,*)' accelerating the convergence' |
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89 | IF(lwp) WRITE(numout,*)' dynamics time step = ', rdt/3600., ' hours' |
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90 | #if defined key_s_coord |
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91 | IF( rdtmin /= rdtmax ) THEN |
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92 | IF(lwp) WRITE(numout,cform_err) |
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93 | IF(lwp) WRITE(numout,*)' depth dependent acceleration of & |
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94 | &convergence not implemented in s-coordinates' |
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95 | nstop = nstop + 1 |
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96 | ENDIF |
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97 | #endif |
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98 | #if defined key_partial_steps |
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99 | IF( rdtmin /= rdtmax ) THEN |
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100 | IF(lwp) WRITE(numout,cform_err) |
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101 | IF(lwp) WRITE(numout,*)' depth dependent acceleration of & |
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102 | &convergence not implemented for partial steps case' |
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103 | nstop = nstop + 1 |
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104 | ENDIF |
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105 | #endif |
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106 | IF(lwp) WRITE(numout,*)' tracers time step : dt (hours) level' |
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107 | |
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108 | DO jk = 1, jpk |
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109 | IF( fsdept(1,1,jk) <= rdth ) rdttra(jk) = rdtmin |
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110 | IF( fsdept(1,1,jk) > rdth ) THEN |
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111 | rdttra(jk) = rdtmin + ( rdtmax - rdtmin ) & |
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112 | * ( EXP( ( fsdept(1,1,jk ) - rdth ) / rdth ) - 1. ) & |
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113 | / ( EXP( ( fsdept(1,1,jpk) - rdth ) / rdth ) - 1. ) |
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114 | ENDIF |
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115 | IF(lwp) WRITE(numout,9200) rdttra(jk)/3600., jk |
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116 | END DO |
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117 | 9200 FORMAT(36x,f5.2,' ',i3) |
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118 | |
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119 | CASE DEFAULT ! E R R O R |
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120 | |
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121 | IF(lwp) WRITE(numout,cform_err) |
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122 | IF(lwp) WRITE(numout,*) ' nacc value e r r o r, nacc= ',nacc |
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123 | IF(lwp) WRITE(numout,*) ' we stop' |
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124 | nstop = nstop + 1 |
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125 | |
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126 | END SELECT |
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127 | |
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128 | END SUBROUTINE dom_stp |
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129 | |
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130 | !!====================================================================== |
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131 | END MODULE domstp |
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