1 | MODULE dynspg |
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2 | !!====================================================================== |
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3 | !! *** MODULE dynspg *** |
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4 | !! Ocean dynamics: surface pressure gradient control |
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5 | !!====================================================================== |
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6 | !! History : 1.0 ! 2005-12 (C. Talandier, G. Madec, V. Garnier) Original code |
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7 | !! 3.2 ! 2009-07 (R. Benshila) Suppression of rigid-lid option |
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8 | !!---------------------------------------------------------------------- |
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9 | |
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10 | !!---------------------------------------------------------------------- |
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11 | !! dyn_spg : update the dynamics trend with surface pressure gradient |
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12 | !! dyn_spg_init: initialization, namelist read, and parameters control |
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13 | !!---------------------------------------------------------------------- |
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14 | USE oce ! ocean dynamics and tracers variables |
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15 | USE dom_oce ! ocean space and time domain variables |
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16 | USE c1d ! 1D vertical configuration |
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17 | USE phycst ! physical constants |
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18 | USE sbc_oce ! surface boundary condition: ocean |
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19 | USE sbcapr ! surface boundary condition: atmospheric pressure |
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20 | USE dynspg_exp ! surface pressure gradient (dyn_spg_exp routine) |
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21 | USE dynspg_ts ! surface pressure gradient (dyn_spg_ts routine) |
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22 | USE sbctide ! |
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23 | USE updtide ! |
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24 | USE trd_oce ! trends: ocean variables |
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25 | USE trddyn ! trend manager: dynamics |
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26 | ! |
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27 | USE prtctl ! Print control (prt_ctl routine) |
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28 | USE in_out_manager ! I/O manager |
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29 | USE lib_mpp ! MPP library |
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30 | USE wrk_nemo ! Memory Allocation |
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31 | USE timing ! Timing |
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32 | |
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33 | IMPLICIT NONE |
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34 | PRIVATE |
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35 | |
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36 | PUBLIC dyn_spg ! routine called by step module |
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37 | PUBLIC dyn_spg_init ! routine called by opa module |
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38 | |
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39 | INTEGER :: nspg = 0 ! type of surface pressure gradient scheme defined from lk_dynspg_... |
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40 | |
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41 | LOGICAL, PUBLIC :: ln_ulimit |
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42 | REAL(wp), PUBLIC :: cn_ulimit,cnn_ulimit |
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43 | |
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44 | ! ! Parameter to control the surface pressure gradient scheme |
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45 | INTEGER, PARAMETER :: np_TS = 1 ! split-explicit time stepping (Time-Splitting) |
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46 | INTEGER, PARAMETER :: np_EXP = 0 ! explicit time stepping |
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47 | INTEGER, PARAMETER :: np_NO =-1 ! no surface pressure gradient, no scheme |
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48 | |
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49 | !! * Substitutions |
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50 | # include "vectopt_loop_substitute.h90" |
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51 | !!---------------------------------------------------------------------- |
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52 | !! NEMO/OPA 3.2 , LODYC-IPSL (2009) |
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53 | !! $Id$ |
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54 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
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55 | !!---------------------------------------------------------------------- |
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56 | CONTAINS |
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57 | |
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58 | SUBROUTINE dyn_spg( kt ) |
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59 | !!---------------------------------------------------------------------- |
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60 | !! *** ROUTINE dyn_spg *** |
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61 | !! |
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62 | !! ** Purpose : compute surface pressure gradient including the |
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63 | !! atmospheric pressure forcing (ln_apr_dyn=T). |
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64 | !! |
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65 | !! ** Method : Two schemes: |
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66 | !! - explicit : the spg is evaluated at now |
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67 | !! - split-explicit : a time splitting technique is used |
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68 | !! |
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69 | !! ln_apr_dyn=T : the atmospheric pressure forcing is applied |
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70 | !! as the gradient of the inverse barometer ssh: |
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71 | !! apgu = - 1/rau0 di[apr] = 0.5*grav di[ssh_ib+ssh_ibb] |
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72 | !! apgv = - 1/rau0 dj[apr] = 0.5*grav dj[ssh_ib+ssh_ibb] |
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73 | !! Note that as all external forcing a time averaging over a two rdt |
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74 | !! period is used to prevent the divergence of odd and even time step. |
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75 | !!---------------------------------------------------------------------- |
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76 | INTEGER, INTENT(in ) :: kt ! ocean time-step index |
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77 | ! |
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78 | INTEGER :: ji, jj, jk ! dummy loop indices |
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79 | REAL(wp) :: z2dt, zg_2, zintp, zgrau0r ! temporary scalar |
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80 | REAL(wp), POINTER, DIMENSION(:,:,:) :: ztrdu, ztrdv |
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81 | REAL(wp), POINTER, DIMENSION(:,:) :: zpice |
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82 | !!---------------------------------------------------------------------- |
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83 | ! |
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84 | IF( nn_timing == 1 ) CALL timing_start('dyn_spg') |
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85 | ! |
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86 | IF( l_trddyn ) THEN ! temporary save of ta and sa trends |
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87 | CALL wrk_alloc( jpi,jpj,jpk, ztrdu, ztrdv ) |
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88 | ztrdu(:,:,:) = ua(:,:,:) |
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89 | ztrdv(:,:,:) = va(:,:,:) |
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90 | ENDIF |
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91 | ! |
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92 | IF( ln_apr_dyn & ! atmos. pressure |
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93 | .OR. ( .NOT.ln_dynspg_ts .AND. (ln_tide_pot .AND. ln_tide) ) & ! tide potential (no time slitting) |
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94 | .OR. nn_ice_embd == 2 ) THEN ! embedded sea-ice |
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95 | ! |
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96 | DO jj = 2, jpjm1 |
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97 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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98 | spgu(ji,jj) = 0._wp |
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99 | spgv(ji,jj) = 0._wp |
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100 | END DO |
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101 | END DO |
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102 | ! |
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103 | IF( ln_apr_dyn .AND. .NOT.ln_dynspg_ts ) THEN !== Atmospheric pressure gradient (added later in time-split case) ==! |
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104 | zg_2 = grav * 0.5 |
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105 | DO jj = 2, jpjm1 ! gradient of Patm using inverse barometer ssh |
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106 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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107 | spgu(ji,jj) = spgu(ji,jj) + zg_2 * ( ssh_ib (ji+1,jj) - ssh_ib (ji,jj) & |
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108 | & + ssh_ibb(ji+1,jj) - ssh_ibb(ji,jj) ) * r1_e1u(ji,jj) |
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109 | spgv(ji,jj) = spgv(ji,jj) + zg_2 * ( ssh_ib (ji,jj+1) - ssh_ib (ji,jj) & |
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110 | & + ssh_ibb(ji,jj+1) - ssh_ibb(ji,jj) ) * r1_e2v(ji,jj) |
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111 | END DO |
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112 | END DO |
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113 | ENDIF |
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114 | ! |
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115 | ! !== tide potential forcing term ==! |
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116 | IF( .NOT.ln_dynspg_ts .AND. ( ln_tide_pot .AND. ln_tide ) ) THEN ! N.B. added directly at sub-time-step in ts-case |
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117 | ! |
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118 | CALL upd_tide( kt ) ! update tide potential |
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119 | ! |
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120 | DO jj = 2, jpjm1 ! add tide potential forcing |
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121 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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122 | spgu(ji,jj) = spgu(ji,jj) + grav * ( pot_astro(ji+1,jj) - pot_astro(ji,jj) ) * r1_e1u(ji,jj) |
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123 | spgv(ji,jj) = spgv(ji,jj) + grav * ( pot_astro(ji,jj+1) - pot_astro(ji,jj) ) * r1_e2v(ji,jj) |
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124 | END DO |
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125 | END DO |
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126 | ENDIF |
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127 | ! |
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128 | IF( nn_ice_embd == 2 ) THEN !== embedded sea ice: Pressure gradient due to snow-ice mass ==! |
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129 | CALL wrk_alloc( jpi,jpj, zpice ) |
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130 | ! |
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131 | zintp = REAL( MOD( kt-1, nn_fsbc ) ) / REAL( nn_fsbc ) |
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132 | zgrau0r = - grav * r1_rau0 |
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133 | zpice(:,:) = ( zintp * snwice_mass(:,:) + ( 1.- zintp ) * snwice_mass_b(:,:) ) * zgrau0r |
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134 | DO jj = 2, jpjm1 |
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135 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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136 | spgu(ji,jj) = spgu(ji,jj) + ( zpice(ji+1,jj) - zpice(ji,jj) ) * r1_e1u(ji,jj) |
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137 | spgv(ji,jj) = spgv(ji,jj) + ( zpice(ji,jj+1) - zpice(ji,jj) ) * r1_e2v(ji,jj) |
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138 | END DO |
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139 | END DO |
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140 | ! |
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141 | CALL wrk_dealloc( jpi,jpj, zpice ) |
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142 | ENDIF |
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143 | ! |
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144 | DO jk = 1, jpkm1 !== Add all terms to the general trend |
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145 | DO jj = 2, jpjm1 |
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146 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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147 | ua(ji,jj,jk) = ua(ji,jj,jk) + spgu(ji,jj) |
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148 | va(ji,jj,jk) = va(ji,jj,jk) + spgv(ji,jj) |
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149 | END DO |
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150 | END DO |
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151 | END DO |
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152 | ! |
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153 | !!gm add here a call to dyn_trd for ice pressure gradient, the surf pressure trends ???? |
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154 | ! |
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155 | ENDIF |
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156 | ! |
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157 | SELECT CASE ( nspg ) !== surface pressure gradient computed and add to the general trend ==! |
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158 | CASE ( np_EXP ) ; CALL dyn_spg_exp( kt ) ! explicit |
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159 | CASE ( np_TS ) ; CALL dyn_spg_ts ( kt ) ! time-splitting |
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160 | END SELECT |
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161 | ! |
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162 | IF( l_trddyn ) THEN ! save the surface pressure gradient trends for further diagnostics |
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163 | ztrdu(:,:,:) = ua(:,:,:) - ztrdu(:,:,:) |
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164 | ztrdv(:,:,:) = va(:,:,:) - ztrdv(:,:,:) |
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165 | CALL trd_dyn( ztrdu, ztrdv, jpdyn_spg, kt ) |
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166 | CALL wrk_dealloc( jpi,jpj,jpk, ztrdu, ztrdv ) |
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167 | ENDIF |
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168 | ! ! print mean trends (used for debugging) |
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169 | IF(ln_ctl) CALL prt_ctl( tab3d_1=ua, clinfo1=' spg - Ua: ', mask1=umask, & |
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170 | & tab3d_2=va, clinfo2= ' Va: ', mask2=vmask, clinfo3='dyn' ) |
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171 | ! |
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172 | IF( nn_timing == 1 ) CALL timing_stop('dyn_spg') |
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173 | ! |
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174 | END SUBROUTINE dyn_spg |
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175 | |
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176 | |
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177 | SUBROUTINE dyn_spg_init |
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178 | !!--------------------------------------------------------------------- |
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179 | !! *** ROUTINE dyn_spg_init *** |
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180 | !! |
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181 | !! ** Purpose : Control the consistency between namelist options for |
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182 | !! surface pressure gradient schemes |
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183 | !!---------------------------------------------------------------------- |
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184 | INTEGER :: ioptio, ios ! local integers |
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185 | ! |
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186 | NAMELIST/namdyn_spg/ ln_dynspg_exp , ln_dynspg_ts, & |
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187 | & ln_bt_fw, ln_bt_av , ln_bt_auto , & |
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188 | & nn_baro , rn_bt_cmax, nn_bt_flt , & |
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189 | ln_ulimit, cn_ulimit, cnn_ulimit |
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190 | !!---------------------------------------------------------------------- |
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191 | ! |
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192 | IF( nn_timing == 1 ) CALL timing_start('dyn_spg_init') |
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193 | ! |
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194 | REWIND( numnam_ref ) ! Namelist namdyn_spg in reference namelist : Free surface |
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195 | READ ( numnam_ref, namdyn_spg, IOSTAT = ios, ERR = 901) |
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196 | 901 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namdyn_spg in reference namelist', lwp ) |
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197 | ! |
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198 | REWIND( numnam_cfg ) ! Namelist namdyn_spg in configuration namelist : Free surface |
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199 | READ ( numnam_cfg, namdyn_spg, IOSTAT = ios, ERR = 902 ) |
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200 | 902 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namdyn_spg in configuration namelist', lwp ) |
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201 | IF(lwm) WRITE ( numond, namdyn_spg ) |
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202 | ! |
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203 | IF(lwp) THEN ! Namelist print |
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204 | WRITE(numout,*) |
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205 | WRITE(numout,*) 'dyn_spg_init : choice of the surface pressure gradient scheme' |
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206 | WRITE(numout,*) '~~~~~~~~~~~' |
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207 | WRITE(numout,*) ' Explicit free surface ln_dynspg_exp = ', ln_dynspg_exp |
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208 | WRITE(numout,*) ' Free surface with time splitting ln_dynspg_ts = ', ln_dynspg_ts |
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209 | WRITE(numout,*) ' Limit velocities ln_ulimit = ', ln_ulimit |
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210 | WRITE(numout,*) ' Limit velocities max inverse Courant number = ', cn_ulimit |
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211 | WRITE(numout,*) ' Limit velocities multiplier for divergant flow = ', cnn_ulimit |
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212 | ENDIF |
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213 | ! ! Control of surface pressure gradient scheme options |
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214 | nspg = np_NO ; ioptio = 0 |
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215 | IF( ln_dynspg_exp ) THEN ; nspg = np_EXP ; ioptio = ioptio + 1 ; ENDIF |
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216 | IF( ln_dynspg_ts ) THEN ; nspg = np_TS ; ioptio = ioptio + 1 ; ENDIF |
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217 | ! |
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218 | IF( ioptio > 1 ) CALL ctl_stop( 'Choose only one surface pressure gradient scheme' ) |
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219 | IF( ioptio == 0 ) CALL ctl_warn( 'NO surface pressure gradient trend in momentum Eqs.' ) |
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220 | IF( ln_dynspg_exp .AND. ln_isfcav ) & |
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221 | & CALL ctl_stop( ' dynspg_exp not tested with ice shelf cavity ' ) |
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222 | ! |
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223 | IF(lwp) THEN |
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224 | WRITE(numout,*) |
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225 | IF( nspg == np_EXP ) WRITE(numout,*) ' ===>> explicit free surface' |
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226 | IF( nspg == np_TS ) WRITE(numout,*) ' ===>> free surface with time splitting scheme' |
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227 | IF( nspg == np_NO ) WRITE(numout,*) ' ===>> No surface surface pressure gradient trend in momentum Eqs.' |
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228 | ENDIF |
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229 | ! |
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230 | IF( nspg == np_TS ) THEN ! split-explicit scheme initialisation |
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231 | CALL dyn_spg_ts_init ! do it first: set nn_baro used to allocate some arrays later on |
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232 | IF( dyn_spg_ts_alloc() /= 0 ) CALL ctl_stop('STOP', 'dyn_spg_init: failed to allocate dynspg_ts arrays' ) |
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233 | IF( neuler/=0 .AND. ln_bt_fw ) CALL ts_rst( nit000, 'READ' ) |
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234 | ENDIF |
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235 | ! |
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236 | IF( nn_timing == 1 ) CALL timing_stop('dyn_spg_init') |
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237 | ! |
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238 | END SUBROUTINE dyn_spg_init |
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239 | |
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240 | !!====================================================================== |
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241 | END MODULE dynspg |
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