1 | MODULE stpRK3 |
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2 | !!====================================================================== |
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3 | !! *** MODULE stpRK3 *** |
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4 | !! RK3 Time-stepping: manager of the ocean, tracer and ice time stepping |
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5 | !!====================================================================== |
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6 | !! History : 5.0 ! 2018-07 (G. Madec) original code |
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7 | !!---------------------------------------------------------------------- |
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8 | |
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9 | !!---------------------------------------------------------------------- |
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10 | !! stp_RK3 : NEMO system RK3 time-stepping scheme |
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11 | !! stp_RK3_init : initialize the RK3 scheme |
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12 | !!---------------------------------------------------------------------- |
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13 | USE step_oce ! time stepping definition modules |
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14 | ! |
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15 | USE iom ! xIOs server |
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16 | |
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17 | IMPLICIT NONE |
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18 | PRIVATE |
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19 | |
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20 | PUBLIC stp_RK3 ! called by nemogcm.F90 |
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21 | |
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22 | LOGICAL :: l_1st_stg = .TRUE. ! 1st stage only flag |
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23 | LOGICAL :: l_2nd_stg = .TRUE. ! 2nd stage only flag |
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24 | LOGICAL :: l_3rd_stg = .TRUE. ! 3rd stage only flag |
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25 | |
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26 | !!---------------------------------------------------------------------- |
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27 | !! NEMO/OCE 5.0 , NEMO Consortium (2018) |
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28 | !! $Id$ |
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29 | !! Software governed by the CeCILL licence (./LICENSE) |
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30 | !!---------------------------------------------------------------------- |
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31 | CONTAINS |
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32 | |
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33 | #if defined key_agrif |
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34 | RECURSIVE SUBROUTINE stp_RK3( ) |
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35 | INTEGER :: kstp ! ocean time-step index |
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36 | #else |
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37 | SUBROUTINE stp_RK3( kstp ) |
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38 | INTEGER, INTENT(in) :: kstp ! ocean time-step index |
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39 | #endif |
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40 | !!---------------------------------------------------------------------- |
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41 | !! *** ROUTINE stp *** |
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42 | !! |
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43 | !! ** Purpose : - Time stepping of OPA (momentum and active tracer eqs.) |
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44 | !! - Time stepping of SI3 (dynamic and thermodynamic eqs.) |
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45 | !! - Time stepping of TRC (passive tracer eqs.) |
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46 | !! |
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47 | !! ** Method : -1- Update forcings and data |
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48 | !! -2- Update ocean physics |
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49 | !! -3- Compute the t and s trends |
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50 | !! -4- Update t and s |
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51 | !! -5- Compute the momentum trends |
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52 | !! -6- Update the horizontal velocity |
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53 | !! -7- Compute the diagnostics variables (rd,N2, hdiv,w) |
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54 | !! -8- Outputs and diagnostics |
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55 | !!---------------------------------------------------------------------- |
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56 | INTEGER :: ji, jj, jk, jstg ! dummy loop indice |
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57 | INTEGER :: indic ! error indicator if < 0 |
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58 | !!gm kcall can be removed, I guess |
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59 | INTEGER :: kcall ! optional integer argument (dom_vvl_sf_nxt) |
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60 | !! --------------------------------------------------------------------- |
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61 | #if defined key_agrif |
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62 | kstp = nit000 + Agrif_Nb_Step() |
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63 | IF( lk_agrif_debug ) THEN |
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64 | IF( Agrif_Root() .and. lwp) WRITE(*,*) '---' |
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65 | IF(lwp) WRITE(*,*) 'Grid Number', Agrif_Fixed(),' time step ', kstp, 'int tstep', Agrif_NbStepint() |
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66 | ENDIF |
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67 | IF( kstp == nit000 + 1 ) lk_agrif_fstep = .FALSE. |
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68 | # if defined key_iomput |
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69 | IF( Agrif_Nbstepint() == 0 ) CALL iom_swap( cxios_context ) |
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70 | # endif |
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71 | #endif |
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72 | ! |
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73 | IF( ln_timing ) CALL timing_start('stp') |
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74 | |
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75 | !!!======================!!! |
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76 | !!! First STAGE only !!! |
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77 | !!!======================!!! |
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78 | |
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79 | !>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> |
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80 | ! update I/O and calendar |
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81 | !<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< |
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82 | indic = 0 ! reset to no error condition |
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83 | |
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84 | IF( kstp == nit000 ) THEN ! initialize IOM context (must be done after nemo_init for AGRIF+XIOS+OASIS) |
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85 | CALL iom_init( cxios_context ) ! for model grid (including passible AGRIF zoom) |
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86 | IF( ln_crs ) CALL iom_init( TRIM(cxios_context)//"_crs" ) ! for coarse grid |
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87 | ENDIF |
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88 | IF( kstp /= nit000 ) CALL day( kstp ) ! Calendar (day was already called at nit000 in day_init) |
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89 | CALL iom_setkt( kstp - nit000 + 1, cxios_context ) ! tell IOM we are at time step kstp |
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90 | IF( ln_crs ) CALL iom_setkt( kstp - nit000 + 1, TRIM(cxios_context)//"_crs" ) ! tell IOM we are at time step kstp |
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91 | |
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92 | !>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> |
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93 | ! Update external forcing (tides, open boundaries, and surface boundary condition (including sea-ice) |
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94 | !<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< |
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95 | IF( ln_tide ) CALL sbc_tide( kstp ) ! update tide potential |
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96 | IF( ln_apr_dyn ) CALL sbc_apr ( kstp ) ! atmospheric pressure (NB: call before bdy_dta which needs ssh_ib) |
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97 | IF( ln_bdy ) CALL bdy_dta ( kstp, time_offset=+1 ) ! update dynamic & tracer data at open boundaries |
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98 | CALL sbc ( kstp ) ! Sea Boundary Condition (including sea-ice) |
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99 | IF ( ln_diurnal ) CALL stp_diurnal( kstp ) ! diagnose cool skin |
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100 | ! |
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101 | |
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102 | !>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> |
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103 | ! Update stochastic parameters and random T/S fluctuations |
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104 | !>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> |
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105 | IF( ln_sto_eos ) CALL sto_par( kstp ) ! Stochastic parameters |
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106 | IF( ln_sto_eos ) CALL sto_pts( tsn ) ! Random T/S fluctuations |
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107 | |
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108 | !>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> |
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109 | ! Ocean physics update |
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110 | !<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< |
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111 | ! THERMODYNAMICS |
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112 | CALL eos_rab( tsb, rab_b ) ! before local thermal/haline expension ratio at T-points |
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113 | CALL eos_rab( tsn, rab_n ) ! now local thermal/haline expension ratio at T-points |
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114 | CALL bn2 ( tsb, rab_b, rn2b ) ! before Brunt-Vaisala frequency |
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115 | CALL bn2 ( tsn, rab_n, rn2 ) ! now Brunt-Vaisala frequency |
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116 | |
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117 | ! VERTICAL PHYSICS |
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118 | CALL zdf_phy( kstp ) ! vertical physics update (top/bot drag, avt, avs, avm + MLD) |
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119 | |
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120 | ! LATERAL PHYSICS |
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121 | ! |
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122 | IF( l_ldfslp ) THEN ! slope of lateral mixing |
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123 | CALL eos( tsb, rhd, gdept_0(:,:,:) ) ! before in situ density |
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124 | |
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125 | IF( ln_zps .AND. .NOT. ln_isfcav) & |
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126 | & CALL zps_hde ( kstp, jpts, tsb, gtsu, gtsv, & ! Partial steps: before horizontal gradient |
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127 | & rhd, gru , grv ) ! of t, s, rd at the last ocean level |
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128 | |
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129 | IF( ln_zps .AND. ln_isfcav) & |
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130 | & CALL zps_hde_isf( kstp, jpts, tsb, gtsu, gtsv, gtui, gtvi, & ! Partial steps for top cell (ISF) |
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131 | & rhd, gru , grv , grui, grvi ) ! of t, s, rd at the first ocean level |
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132 | IF( ln_traldf_triad ) THEN |
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133 | CALL ldf_slp_triad( kstp ) ! before slope for triad operator |
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134 | ELSE |
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135 | CALL ldf_slp ( kstp, rhd, rn2b ) ! before slope for standard operator |
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136 | ENDIF |
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137 | ENDIF |
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138 | ! ! eddy diffusivity coeff. |
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139 | IF( l_ldftra_time .OR. l_ldfeiv_time ) CALL ldf_tra( kstp ) ! and/or eiv coeff. |
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140 | IF( l_ldfdyn_time ) CALL ldf_dyn( kstp ) ! eddy viscosity coeff. |
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141 | |
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142 | |
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143 | !!!======================!!! |
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144 | !!! Loop over stages !!! |
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145 | !!!======================!!! |
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146 | |
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147 | DO jstg = 1, 3 |
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148 | |
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149 | SELECT CASE( jstg ) |
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150 | CASE( 1 ) ; rDt = rn_Dt / 3._wp |
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151 | CASE( 2 ) ; rDt = rn_Dt / 2._wp |
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152 | CASE( 3 ) ; rDt = rn_Dt |
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153 | END SELECT |
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154 | |
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155 | !>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> |
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156 | ! Ocean dynamics : hdiv, ssh, e3, u, v, w |
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157 | !<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< |
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158 | |
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159 | CALL ssh_nxt ( kstp ) ! after ssh (includes call to div_hor) |
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160 | IF(.NOT.ln_linssh ) CALL dom_vvl_sf_nxt( kstp ) ! after vertical scale factors |
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161 | CALL wzv ( kstp ) ! now cross-level velocity |
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162 | CALL eos ( tsb, rhd, rhop, gdept_n(:,:,:) ) ! now in situ density for hpg computation |
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163 | |
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164 | !!jc: fs simplification |
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165 | !!jc: lines below are useless if ln_linssh=F. Keep them here (which maintains a bug if ln_linssh=T and ln_zps=T, cf ticket #1636) |
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166 | !! but ensures reproductible results |
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167 | !! with previous versions using split-explicit free surface |
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168 | IF( ln_zps .AND. .NOT. ln_isfcav ) & |
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169 | & CALL zps_hde ( kstp, jpts, tsn, gtsu, gtsv, & ! Partial steps: before horizontal gradient |
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170 | & rhd, gru , grv ) ! of t, s, rd at the last ocean level |
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171 | IF( ln_zps .AND. ln_isfcav ) & |
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172 | & CALL zps_hde_isf( kstp, jpts, tsn, gtsu, gtsv, gtui, gtvi, & ! Partial steps for top cell (ISF) |
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173 | & rhd, gru , grv , grui, grvi ) ! of t, s, rd at the first ocean level |
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174 | !!jc: fs simplification |
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175 | |
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176 | ua (:,:,:) = 0._wp ! set the RHS of dyn Eq. to zero |
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177 | va (:,:,:) = 0._wp |
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178 | tsa(:,:,:,:) = 0._wp ! set tracer trends to zero |
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179 | ! |
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180 | ! ! ================ ! |
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181 | IF ( jstg <= 3 ) THEN ! stages 1 & 2 : ADV, COR, HPG and SPG trends only |
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182 | ! ! ================ ! |
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183 | ! |
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184 | ! !== dynamics ==! |
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185 | CALL dyn_adv( kstp ) ! advection (vector or flux form) |
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186 | CALL dyn_vor( kstp ) ! vorticity term including Coriolis |
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187 | CALL dyn_hpg( kstp ) ! horizontal gradient of Hydrostatic pressure |
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188 | CALL dyn_spg( kstp ) ! surface pressure gradient |
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189 | ! With split-explicit free surface, since now transports have been updated and ssha as well |
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190 | IF( ln_dynspg_ts ) THEN ! vertical scale factors and vertical velocity need to be updated |
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191 | CALL div_hor( kstp ) ! Horizontal divergence (2nd call in time-split case) |
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192 | IF(.NOT.ln_linssh) CALL dom_vvl_sf_nxt( kstp, kcall=2 ) ! after vertical scale factors (update depth average component) |
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193 | CALL wzv ( kstp ) ! now cross-level velocity |
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194 | ENDIF |
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195 | !!gm to be added here : time stepping ==>>> un & vn |
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196 | |
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197 | |
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198 | ! !== tracers ==! |
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199 | #if defined key_top |
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200 | CALL trc_adv( kstp ) ! horizontal & vertical advection |
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201 | #endif |
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202 | CALL tra_adv( kstp ) ! horizontal & vertical advection |
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203 | |
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204 | !!gm to be added here : time stepping ==>>> tsn |
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205 | |
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206 | ! |
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207 | ! ! ================ ! |
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208 | ELSE ! stage 3 : add all dynamical trends |
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209 | ! ! ================ ! |
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210 | ! |
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211 | ! !== dynamics ==! |
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212 | CALL dyn_adv( kstp ) ! advection (vector or flux form) |
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213 | CALL dyn_vor( kstp ) ! vorticity term including Coriolis |
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214 | CALL dyn_hpg( kstp ) ! horizontal gradient of Hydrostatic pressure |
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215 | ! |
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216 | IF(l_dynasm) CALL dyn_asm_inc ( kstp ) ! apply dynamics assimilation increment |
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217 | IF( ln_bdy ) CALL bdy_dyn3d_dmp ( kstp ) ! bdy damping trends |
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218 | #if defined key_agrif |
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219 | IF(.NOT. Agrif_Root()) CALL Agrif_Sponge_dyn ! momentum sponge |
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220 | #endif |
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221 | IF( ln_zdfosm ) CALL dyn_osm( kstp ) ! OSMOSIS non-local velocity fluxes |
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222 | CALL dyn_ldf( kstp ) ! lateral mixing |
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223 | CALL dyn_spg( kstp ) ! surface pressure gradient |
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224 | ! With split-explicit free surface, since now transports have been updated and ssha as well |
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225 | IF( ln_dynspg_ts ) THEN ! vertical scale factors and vertical velocity need to be updated |
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226 | CALL div_hor( kstp ) ! Horizontal divergence (2nd call in time-split case) |
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227 | IF(.NOT.ln_linssh) CALL dom_vvl_sf_nxt( kstp, kcall=2 ) ! after vertical scale factors (update depth average component) |
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228 | CALL wzv ( kstp ) ! now cross-level velocity |
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229 | ENDIF |
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230 | CALL dyn_zdf( kstp ) ! vertical diffusion & time-stepping |
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231 | |
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232 | ! !== tracers ==! |
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233 | IF( ln_crs ) CALL crs_fld( kstp ) ! ocean model: online field coarsening & output |
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234 | #if defined key_top |
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235 | CALL trc_stp ( kstp ) ! time-stepping |
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236 | #endif |
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237 | |
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238 | tsa(:,:,:,:) = 0._wp ! set tracer trends to zero |
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239 | |
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240 | CALL tra_adv ( kstp ) ! horizontal & vertical advection |
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241 | IF( l_traasm ) CALL tra_asm_inc ( kstp ) ! apply tracer assimilation increment |
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242 | CALL tra_sbc ( kstp ) ! surface boundary condition |
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243 | IF( ln_traqsr ) CALL tra_qsr ( kstp ) ! penetrative solar radiation qsr |
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244 | IF( ln_trabbc ) CALL tra_bbc ( kstp ) ! bottom heat flux |
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245 | IF( ln_trabbl ) CALL tra_bbl ( kstp ) ! advective (and/or diffusive) bottom boundary layer scheme |
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246 | IF( ln_tradmp ) CALL tra_dmp ( kstp ) ! internal damping trends |
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247 | IF( ln_bdy ) CALL bdy_tra_dmp ( kstp ) ! bdy damping trends |
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248 | #if defined key_agrif |
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249 | IF(.NOT. Agrif_Root()) CALL Agrif_Sponge_tra ! tracers sponge |
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250 | #endif |
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251 | IF( ln_zdfosm ) CALL tra_osm ( kstp ) ! OSMOSIS non-local tracer fluxes |
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252 | IF( lrst_oce .AND. ln_zdfosm ) & |
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253 | & CALL osm_rst( kstp, 'WRITE' )! write OSMOSIS outputs + wn (so must do here) to restarts |
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254 | CALL tra_ldf ( kstp ) ! lateral mixing |
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255 | |
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256 | !!gm : why CALL to dia_ptr has been moved here??? (use trends info?) |
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257 | IF( ln_diaptr ) CALL dia_ptr ! Poleward adv/ldf TRansports diagnostics |
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258 | !!gm |
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259 | CALL tra_zdf ( kstp ) ! vertical mixing and after tracer fields |
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260 | IF( ln_zdfnpc ) CALL tra_npc ( kstp ) ! update after fields by non-penetrative convection |
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261 | |
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262 | |
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263 | ENDIF |
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264 | |
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265 | |
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266 | |
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267 | |
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268 | |
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269 | !>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> |
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270 | ! Set boundary conditions and Swap |
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271 | !<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< |
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272 | !!jc1: For agrif, it would be much better to finalize tracers/momentum here (e.g. bdy conditions) and move the swap |
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273 | !! (and time filtering) after Agrif update. Then restart would be done after and would contain updated fields. |
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274 | !! If so: |
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275 | !! (i) no need to call agrif update at initialization time |
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276 | !! (ii) no need to update "before" fields |
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277 | !! |
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278 | !! Apart from creating new tra_swp/dyn_swp routines, this however: |
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279 | !! (i) makes boundary conditions at initialization time computed from updated fields which is not the case between |
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280 | !! two restarts => restartability issue. One can circumvent this, maybe, by assuming "interface separation", |
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281 | !! e.g. a shift of the feedback interface inside child domain. |
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282 | !! (ii) requires that all restart outputs of updated variables by agrif (e.g. passive tracers/tke/barotropic arrays) are done at the same |
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283 | !! place. |
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284 | !! |
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285 | !!jc2: dynnxt must be the latest call. e3t_b are indeed updated in that routine |
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286 | CALL tra_nxt ( kstp ) ! finalize (bcs) tracer fields at next time step and swap |
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287 | CALL dyn_nxt ( kstp ) ! finalize (bcs) velocities at next time step and swap (always called after tra_nxt) |
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288 | CALL ssh_swp ( kstp ) ! swap of sea surface height |
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289 | IF(.NOT.ln_linssh) CALL dom_vvl_sf_swp( kstp ) ! swap of vertical scale factors |
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290 | ! |
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291 | |
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292 | |
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293 | |
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294 | |
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295 | !!!==========================!!! |
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296 | !!! end Loop over stages !!! |
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297 | !!!==========================!!! |
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298 | |
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299 | END DO |
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300 | |
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301 | |
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302 | IF( ln_diahsb ) CALL dia_hsb ( kstp ) ! - ML - global conservation diagnostics |
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303 | |
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304 | !!gm : This does not only concern the dynamics ==>>> add a new title |
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305 | !!gm2: why ouput restart before AGRIF update? |
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306 | !! |
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307 | !!jc: That would be better, but see comment above |
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308 | !! |
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309 | IF( lrst_oce ) CALL rst_write ( kstp ) ! write output ocean restart file |
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310 | IF( ln_sto_eos ) CALL sto_rst_write( kstp ) ! write restart file for stochastic parameters |
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311 | |
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312 | #if defined key_agrif |
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313 | !>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> |
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314 | ! AGRIF |
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315 | !<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< |
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316 | CALL Agrif_Integrate_ChildGrids( stp_RK3 ) ! allows to finish all the Child Grids before updating |
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317 | |
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318 | IF( Agrif_NbStepint() == 0 ) CALL Agrif_update_all( ) ! Update all components |
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319 | #endif |
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320 | |
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321 | !>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> |
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322 | ! diagnostics and outputs |
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323 | !<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< |
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324 | IF( ln_diaobs ) CALL dia_obs ( kstp ) ! obs-minus-model (assimilation) diagnostics (call after dynamics update) |
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325 | IF( lk_floats ) CALL flo_stp ( kstp ) ! drifting Floats |
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326 | IF( ln_diacfl ) CALL dia_cfl ( kstp ) ! Courant number diagnostics |
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327 | IF( lk_diahth ) CALL dia_hth ( kstp ) ! Thermocline depth (20 degres isotherm depth) |
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328 | IF( lk_diadct ) CALL dia_dct ( kstp ) ! Transports |
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329 | CALL dia_ar5 ( kstp ) ! ar5 diag |
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330 | IF( lk_diaharm ) CALL dia_harm( kstp ) ! Tidal harmonic analysis |
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331 | CALL dia_wri ( kstp ) ! ocean model: outputs |
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332 | |
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333 | !>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> |
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334 | ! Control |
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335 | !<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< |
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336 | CALL stp_ctl ( kstp, indic ) |
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337 | |
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338 | IF( kstp == nit000 ) THEN ! 1st time step only |
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339 | CALL iom_close( numror ) ! close input ocean restart file |
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340 | IF(lwm) CALL FLUSH ( numond ) ! flush output namelist oce |
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341 | IF(lwm .AND. numoni /= -1 ) CALL FLUSH ( numoni ) ! flush output namelist ice (if exist) |
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342 | ENDIF |
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343 | |
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344 | !>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> |
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345 | ! Coupled mode |
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346 | !<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< |
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347 | !!gm why lk_oasis and not lk_cpl ???? |
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348 | IF( lk_oasis ) CALL sbc_cpl_snd( kstp ) ! coupled mode : field exchanges |
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349 | ! |
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350 | #if defined key_iomput |
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351 | IF( kstp == nitend .OR. indic < 0 ) THEN |
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352 | CALL iom_context_finalize( cxios_context ) ! needed for XIOS+AGRIF |
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353 | IF(lrxios) CALL iom_context_finalize( crxios_context ) |
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354 | IF( ln_crs ) CALL iom_context_finalize( trim(cxios_context)//"_crs" ) ! |
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355 | ENDIF |
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356 | #endif |
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357 | ! |
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358 | IF( ln_timing ) CALL timing_stop('stp') |
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359 | ! |
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360 | END SUBROUTINE stp_RK3 |
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361 | |
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362 | |
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363 | SUBROUTINE stp_RK3_init |
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364 | !!---------------------------------------------------------------------- |
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365 | !! *** ROUTINE stp_RK3_init *** |
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366 | !! |
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367 | !! ** Purpose : RK3 time stepping initialization |
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368 | !! |
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369 | !! ** Method : |
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370 | !!---------------------------------------------------------------------- |
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371 | |
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372 | |
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373 | END SUBROUTINE stp_RK3_init |
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374 | |
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375 | !!====================================================================== |
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376 | END MODULE stpRK3 |
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