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 | !! 3.7 ! 2015-11 (J. Chanut) Suppression of filtered free surface |
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9 | !!---------------------------------------------------------------------- |
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10 | |
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11 | !!---------------------------------------------------------------------- |
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12 | !! dyn_spg : update the dynamics trend with surface pressure gradient |
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13 | !! dyn_spg_init: initialization, namelist read, and parameters control |
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14 | !!---------------------------------------------------------------------- |
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15 | USE oce ! ocean dynamics and tracers variables |
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16 | USE dom_oce ! ocean space and time domain variables |
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17 | USE c1d ! 1D vertical configuration |
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18 | USE phycst ! physical constants |
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19 | USE sbc_oce ! surface boundary condition: ocean |
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20 | USE sbcapr ! surface boundary condition: atmospheric pressure |
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21 | USE dynspg_exp ! surface pressure gradient (dyn_spg_exp routine) |
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22 | USE dynspg_ts ! surface pressure gradient (dyn_spg_ts routine) |
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23 | USE sbctide |
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24 | USE updtide |
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25 | USE trd_oce ! trends: ocean variables |
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26 | USE trddyn ! trend manager: dynamics |
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27 | ! |
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28 | USE prtctl ! Print control (prt_ctl routine) |
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29 | USE in_out_manager ! I/O manager |
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30 | USE lib_mpp ! MPP library |
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31 | USE wrk_nemo ! Memory Allocation |
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32 | USE timing ! Timing |
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33 | |
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34 | |
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35 | IMPLICIT NONE |
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36 | PRIVATE |
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37 | |
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38 | PUBLIC dyn_spg ! routine called by step module |
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39 | PUBLIC dyn_spg_init ! routine called by opa module |
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40 | |
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41 | INTEGER :: nspg = 0 ! type of surface pressure gradient scheme defined from ln_dynspg_... |
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42 | |
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43 | !! * Substitutions |
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44 | # include "domzgr_substitute.h90" |
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45 | # include "vectopt_loop_substitute.h90" |
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46 | !!---------------------------------------------------------------------- |
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47 | !! NEMO/OPA 3.2 , LODYC-IPSL (2009) |
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48 | !! $Id$ |
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49 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
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50 | !!---------------------------------------------------------------------- |
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51 | CONTAINS |
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52 | |
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53 | SUBROUTINE dyn_spg( kt ) |
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54 | !!---------------------------------------------------------------------- |
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55 | !! *** ROUTINE dyn_spg *** |
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56 | !! |
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57 | !! ** Purpose : achieve the momentum time stepping by computing the |
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58 | !! last trend, the surface pressure gradient including the |
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59 | !! atmospheric pressure forcing (ln_apr_dyn=T), and performing |
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60 | !! the Leap-Frog integration. |
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61 | !!gm In the current version only the filtered solution provide |
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62 | !!gm the after velocity, in the 2 other (ua,va) are still the trends |
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63 | !! |
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64 | !! ** Method : Two schemes: |
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65 | !! - explicit computation : the spg is evaluated at now |
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66 | !! - split-explicit computation: a time splitting technique is used |
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67 | !! |
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68 | !! ln_apr_dyn=T : the atmospheric pressure forcing is applied |
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69 | !! as the gradient of the inverse barometer ssh: |
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70 | !! apgu = - 1/rau0 di[apr] = 0.5*grav di[ssh_ib+ssh_ibb] |
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71 | !! apgv = - 1/rau0 dj[apr] = 0.5*grav dj[ssh_ib+ssh_ibb] |
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72 | !! Note that as all external forcing a time averaging over a two rdt |
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73 | !! period is used to prevent the divergence of odd and even time step. |
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74 | !!---------------------------------------------------------------------- |
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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 | |
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87 | !!gm NOTA BENE : the dynspg_exp and dynspg_ts should be modified so that |
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88 | !!gm they return the after velocity, not the trends (as in trazdf_imp...) |
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89 | !!gm In this case, change/simplify dynnxt |
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90 | |
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91 | |
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92 | IF( l_trddyn ) THEN ! temporary save of ta and sa trends |
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93 | CALL wrk_alloc( jpi, jpj, jpk, ztrdu, ztrdv ) |
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94 | ztrdu(:,:,:) = ua(:,:,:) |
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95 | ztrdv(:,:,:) = va(:,:,:) |
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96 | ENDIF |
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97 | |
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98 | IF( ln_apr_dyn & ! atmos. pressure |
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99 | .OR. ( .NOT.ln_dynspg_ts .AND. (ln_tide_pot .AND. lk_tide) ) & ! tide potential (no time slitting) |
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100 | .OR. nn_ice_embd == 2 ) THEN ! embedded sea-ice |
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101 | ! |
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102 | DO jj = 2, jpjm1 |
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103 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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104 | spgu(ji,jj) = 0._wp |
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105 | spgv(ji,jj) = 0._wp |
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106 | END DO |
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107 | END DO |
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108 | ! |
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109 | IF( ln_apr_dyn .AND. (.NOT. ln_dynspg_ts) ) THEN !== Atmospheric pressure gradient (added later in time-split case) ==! |
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110 | zg_2 = grav * 0.5 |
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111 | DO jj = 2, jpjm1 ! gradient of Patm using inverse barometer ssh |
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112 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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113 | spgu(ji,jj) = spgu(ji,jj) + zg_2 * ( ssh_ib (ji+1,jj) - ssh_ib (ji,jj) & |
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114 | & + ssh_ibb(ji+1,jj) - ssh_ibb(ji,jj) ) * r1_e1u(ji,jj) |
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115 | spgv(ji,jj) = spgv(ji,jj) + zg_2 * ( ssh_ib (ji,jj+1) - ssh_ib (ji,jj) & |
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116 | & + ssh_ibb(ji,jj+1) - ssh_ibb(ji,jj) ) * r1_e2v(ji,jj) |
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117 | END DO |
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118 | END DO |
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119 | ENDIF |
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120 | ! |
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121 | ! !== tide potential forcing term ==! |
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122 | IF( .NOT.ln_dynspg_ts .AND. ( ln_tide_pot .AND. lk_tide ) ) THEN ! N.B. added directly at sub-time-step in ts-case |
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123 | ! |
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124 | CALL upd_tide( kt ) ! update tide potential |
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125 | ! |
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126 | DO jj = 2, jpjm1 ! add tide potential forcing |
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127 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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128 | spgu(ji,jj) = spgu(ji,jj) + grav * ( pot_astro(ji+1,jj) - pot_astro(ji,jj) ) * r1_e1u(ji,jj) |
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129 | spgv(ji,jj) = spgv(ji,jj) + grav * ( pot_astro(ji,jj+1) - pot_astro(ji,jj) ) * r1_e2v(ji,jj) |
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130 | END DO |
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131 | END DO |
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132 | ENDIF |
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133 | ! |
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134 | IF( nn_ice_embd == 2 ) THEN !== embedded sea ice: Pressure gradient due to snow-ice mass ==! |
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135 | CALL wrk_alloc( jpi, jpj, zpice ) |
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136 | ! |
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137 | zintp = REAL( MOD( kt-1, nn_fsbc ) ) / REAL( nn_fsbc ) |
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138 | zgrau0r = - grav * r1_rau0 |
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139 | zpice(:,:) = ( zintp * snwice_mass(:,:) + ( 1.- zintp ) * snwice_mass_b(:,:) ) * zgrau0r |
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140 | DO jj = 2, jpjm1 |
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141 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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142 | spgu(ji,jj) = spgu(ji,jj) + ( zpice(ji+1,jj) - zpice(ji,jj) ) * r1_e1u(ji,jj) |
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143 | spgv(ji,jj) = spgv(ji,jj) + ( zpice(ji,jj+1) - zpice(ji,jj) ) * r1_e2v(ji,jj) |
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144 | END DO |
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145 | END DO |
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146 | ! |
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147 | CALL wrk_dealloc( jpi, jpj, zpice ) |
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148 | ENDIF |
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149 | ! |
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150 | DO jk = 1, jpkm1 !== Add all terms to the general trend |
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151 | DO jj = 2, jpjm1 |
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152 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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153 | ua(ji,jj,jk) = ua(ji,jj,jk) + spgu(ji,jj) |
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154 | va(ji,jj,jk) = va(ji,jj,jk) + spgv(ji,jj) |
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155 | END DO |
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156 | END DO |
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157 | END DO |
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158 | |
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159 | !!gm add here a call to dyn_trd for ice pressure gradient, the surf pressure trends ???? |
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160 | |
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161 | ENDIF |
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162 | |
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163 | SELECT CASE ( nspg ) ! compute surf. pressure gradient trend and add it to the general trend |
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164 | ! |
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165 | CASE ( 0 ) ; CALL dyn_spg_exp( kt ) ! explicit |
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166 | CASE ( 1 ) ; CALL dyn_spg_ts ( kt ) ! time-splitting |
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167 | ! |
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168 | END SELECT |
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169 | ! |
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170 | IF( l_trddyn ) THEN ! save the surface pressure gradient trends for further diagnostics |
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171 | ztrdu(:,:,:) = ua(:,:,:) - ztrdu(:,:,:) |
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172 | ztrdv(:,:,:) = va(:,:,:) - ztrdv(:,:,:) |
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173 | CALL trd_dyn( ztrdu, ztrdv, jpdyn_spg, kt ) |
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174 | ! |
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175 | CALL wrk_dealloc( jpi, jpj, jpk, ztrdu, ztrdv ) |
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176 | ENDIF |
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177 | ! ! print mean trends (used for debugging) |
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178 | IF(ln_ctl) CALL prt_ctl( tab3d_1=ua, clinfo1=' spg - Ua: ', mask1=umask, & |
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179 | & tab3d_2=va, clinfo2= ' Va: ', mask2=vmask, clinfo3='dyn' ) |
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180 | ! |
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181 | IF( nn_timing == 1 ) CALL timing_stop('dyn_spg') |
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182 | ! |
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183 | END SUBROUTINE dyn_spg |
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184 | |
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185 | |
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186 | SUBROUTINE dyn_spg_init |
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187 | !!--------------------------------------------------------------------- |
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188 | !! *** ROUTINE dyn_spg_init *** |
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189 | !! |
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190 | !! ** Purpose : Control the consistency between namelist options for |
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191 | !! surface pressure gradient schemes |
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192 | !!---------------------------------------------------------------------- |
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193 | INTEGER :: ioptio, ios |
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194 | ! |
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195 | NAMELIST/namdyn_spg/ ln_dynspg_exp, ln_dynspg_ts, & |
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196 | & ln_bt_fw, ln_bt_av, ln_bt_auto, & |
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197 | & nn_baro, rn_bt_cmax, nn_bt_flt |
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198 | !!---------------------------------------------------------------------- |
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199 | ! |
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200 | IF( nn_timing == 1 ) CALL timing_start('dyn_spg_init') |
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201 | ! |
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202 | REWIND( numnam_ref ) ! Namelist namdyn_spg in reference namelist : Free surface |
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203 | READ ( numnam_ref, namdyn_spg, IOSTAT = ios, ERR = 901) |
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204 | 901 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namdyn_spg in reference namelist', lwp ) |
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205 | |
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206 | REWIND( numnam_cfg ) ! Namelist namdyn_spg in configuration namelist : Free surface |
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207 | READ ( numnam_cfg, namdyn_spg, IOSTAT = ios, ERR = 902 ) |
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208 | 902 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namdyn_spg in configuration namelist', lwp ) |
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209 | IF(lwm) WRITE ( numond, namdyn_spg ) |
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210 | ! |
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211 | IF(lwp) THEN ! Namelist print |
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212 | WRITE(numout,*) |
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213 | WRITE(numout,*) 'dyn_spg_init : choice of the surface pressure gradient scheme' |
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214 | WRITE(numout,*) '~~~~~~~~~~~' |
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215 | WRITE(numout,*) ' Explicit free surface ln_dynspg_exp = ', ln_dynspg_exp |
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216 | WRITE(numout,*) ' Free surface with time splitting ln_dynspg_ts = ', ln_dynspg_ts |
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217 | ENDIF |
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218 | |
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219 | IF( ln_dynspg_ts ) THEN |
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220 | CALL dyn_spg_ts_init( nit000 ) ! do it first, to set nn_baro, used to allocate some arrays later on |
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221 | ! ! allocate dyn_spg arrays |
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222 | IF( dyn_spg_ts_alloc() /= 0 ) CALL ctl_stop('STOP', 'dyn_spg_init: failed to allocate dynspg_ts arrays') |
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223 | IF ((neuler/=0).AND.(ln_bt_fw)) CALL ts_rst( nit000, 'READ' ) |
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224 | ENDIF |
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225 | |
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226 | ! ! Control of surface pressure gradient scheme options |
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227 | ioptio = 0 |
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228 | IF(ln_dynspg_exp) ioptio = ioptio + 1 |
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229 | IF(ln_dynspg_ts ) ioptio = ioptio + 1 |
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230 | ! |
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231 | IF( ioptio > 1 .OR. ( ioptio == 0 .AND. .NOT. lk_c1d ) ) & |
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232 | & CALL ctl_stop( ' Choose only one surface pressure gradient scheme' ) |
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233 | IF( ln_dynspg_ts .AND. ln_isfcav ) & |
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234 | & CALL ctl_stop( ' dynspg_ts not tested with ice shelf cavity ' ) |
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235 | ! |
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236 | IF( ln_dynspg_exp) nspg = 0 |
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237 | IF( ln_dynspg_ts ) nspg = 1 |
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238 | ! |
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239 | IF(lwp) THEN |
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240 | WRITE(numout,*) |
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241 | IF( nspg == 0 ) WRITE(numout,*) ' explicit free surface' |
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242 | IF( nspg == 1 ) WRITE(numout,*) ' free surface with time splitting scheme' |
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243 | ENDIF |
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244 | ! |
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245 | IF( nn_timing == 1 ) CALL timing_stop('dyn_spg_init') |
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246 | ! |
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247 | END SUBROUTINE dyn_spg_init |
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248 | |
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249 | !!====================================================================== |
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250 | END MODULE dynspg |
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