1 | MODULE zpshde |
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2 | !!============================================================================== |
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3 | !! *** MODULE zpshde *** |
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4 | !! z-coordinate - partial step : Horizontal Derivative |
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5 | !!============================================================================== |
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6 | !! History : |
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7 | !! OPA 8.5 ! 2002-04 (A. Bozec) Original code |
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8 | !! 8.5 ! 2002-08 (G. Madec E. Durand) Optimization and Free form |
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9 | !! 9.0 ! 2004-03 (C. Ethe) adapted for passive tracers |
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10 | !! NEMO 3.3 ! 2010-05 (C. Ethe, G. Madec) merge TRC-TRA |
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11 | !!============================================================================== |
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12 | |
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13 | !!---------------------------------------------------------------------- |
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14 | !! zps_hde : Horizontal DErivative of T, S and rd at the last |
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15 | !! ocean level (Z-coord. with Partial Steps) |
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16 | !! zps_hde_trc : Horizontal DErivative of passive tracers at the last |
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17 | !! ocean level (Z-coord. with Partial Steps) |
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18 | !!---------------------------------------------------------------------- |
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19 | !! * Modules used |
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20 | USE dom_oce ! ocean space domain variables |
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21 | USE oce ! ocean dynamics and tracers variables |
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22 | USE phycst ! physical constants |
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23 | USE in_out_manager ! I/O manager |
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24 | USE eosbn2 ! ocean equation of state |
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25 | USE lbclnk ! lateral boundary conditions (or mpp link) |
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26 | |
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27 | IMPLICIT NONE |
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28 | PRIVATE |
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29 | |
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30 | !! * Routine accessibility |
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31 | PUBLIC zps_hde ! routine called by step.F90 |
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32 | PUBLIC zps_hde_init ! routine called by opa.F90 |
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33 | #if defined key_top |
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34 | PUBLIC zps_hde_trc |
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35 | #endif |
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36 | |
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37 | !! * module variables |
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38 | INTEGER, DIMENSION(jpi,jpj) :: & |
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39 | mbatu, mbatv ! bottom ocean level index at U- and V-points |
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40 | |
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41 | !! * Substitutions |
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42 | # include "domzgr_substitute.h90" |
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43 | # include "vectopt_loop_substitute.h90" |
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44 | !!---------------------------------------------------------------------- |
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45 | !!---------------------------------------------------------------------- |
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46 | !! OPA 9.0 , LOCEAN-IPSL (2005) |
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47 | !! $Id$ |
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48 | !! This software is governed by the CeCILL licence see modipsl/doc/NEMO_CeCILL.txt |
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49 | !!---------------------------------------------------------------------- |
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50 | CONTAINS |
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51 | SUBROUTINE zps_hde ( kt, ptem, psal, prd , & |
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52 | pgtu, pgsu, pgru, & |
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53 | pgtv, pgsv, pgrv ) |
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54 | !!---------------------------------------------------------------------- |
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55 | !! *** ROUTINE zps_hde *** |
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56 | !! |
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57 | !! ** Purpose : Compute the horizontal derivative of T, S and rd |
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58 | !! at u- and v-points with a linear interpolation for z-coordinate |
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59 | !! with partial steps. |
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60 | !! |
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61 | !! ** Method : In z-coord with partial steps, scale factors on last |
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62 | !! levels are different for each grid point, so that T, S and rd |
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63 | !! points are not at the same depth as in z-coord. To have horizontal |
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64 | !! gradients again, we interpolate T and S at the good depth : |
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65 | !! Linear interpolation of T, S |
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66 | !! Computation of di(tb) and dj(tb) by vertical interpolation: |
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67 | !! di(t) = t~ - t(i,j,k) or t(i+1,j,k) - t~ |
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68 | !! dj(t) = t~ - t(i,j,k) or t(i,j+1,k) - t~ |
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69 | !! This formulation computes the two cases: |
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70 | !! CASE 1 CASE 2 |
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71 | !! k-1 ___ ___________ k-1 ___ ___________ |
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72 | !! Ti T~ T~ Ti+1 |
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73 | !! _____ _____ |
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74 | !! k | |Ti+1 k Ti | | |
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75 | !! | |____ ____| | |
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76 | !! ___ | | | ___ | | | |
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77 | !! |
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78 | !! case 1-> e3w(i+1) >= e3w(i) ( and e3w(j+1) >= e3w(j) ) then |
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79 | !! t~ = t(i+1,j ,k) + (e3w(i+1) - e3w(i)) * dk(Ti+1)/e3w(i+1) |
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80 | !! ( t~ = t(i ,j+1,k) + (e3w(j+1) - e3w(j)) * dk(Tj+1)/e3w(j+1) ) |
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81 | !! or |
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82 | !! case 2-> e3w(i+1) <= e3w(i) ( and e3w(j+1) <= e3w(j) ) then |
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83 | !! t~ = t(i,j,k) + (e3w(i) - e3w(i+1)) * dk(Ti)/e3w(i ) |
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84 | !! ( t~ = t(i,j,k) + (e3w(j) - e3w(j+1)) * dk(Tj)/e3w(j ) ) |
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85 | !! Idem for di(s) and dj(s) |
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86 | !! |
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87 | !! For rho, we call eos_insitu_2d which will compute rd~(t~,s~) at |
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88 | !! the good depth zh from interpolated T and S for the different |
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89 | !! formulation of the equation of state (eos). |
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90 | !! Gradient formulation for rho : |
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91 | !! di(rho) = rd~ - rd(i,j,k) or rd (i+1,j,k) - rd~ |
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92 | !! |
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93 | !! ** Action : - pgtu, pgsu, pgru: horizontal gradient of T, S |
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94 | !! and rd at U-points |
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95 | !! - pgtv, pgsv, pgrv: horizontal gradient of T, S |
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96 | !! and rd at V-points |
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97 | !!---------------------------------------------------------------------- |
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98 | !! * Arguments |
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99 | INTEGER, INTENT( in ) :: kt ! ocean time-step index |
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100 | REAL(wp), DIMENSION(jpi,jpj,jpk), INTENT( in ) :: ptem, psal, prd ! 3D T, S and rd fields |
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101 | REAL(wp), DIMENSION(jpi,jpj) , INTENT( out ) :: pgtu, pgsu, pgru ! horizontal grad. of T, S and rd at u-point |
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102 | REAL(wp), DIMENSION(jpi,jpj) , INTENT( out ) :: pgtv, pgsv, pgrv ! horizontal grad. of T, S and rd at v-point |
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103 | !! * Local declarations |
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104 | INTEGER :: ji , jj ! Dummy loop indices |
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105 | INTEGER :: iku, ikv ! partial step level at u- and v-points |
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106 | REAL(wp), DIMENSION(jpi,jpj) :: zti, ztj, zsi, zsj ! interpolated value of T, S |
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107 | REAL(wp), DIMENSION(jpi,jpj) :: zri, zrj ! interpolated value of rd |
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108 | REAL(wp), DIMENSION(jpi,jpj) :: zhgi, zhgj ! depth of interpolation for eos2d |
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109 | REAL(wp) :: ze3wu, ze3wv, zmaxu, zmaxv ! temporary scalars |
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110 | |
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111 | |
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112 | ! Interpolation of T and S at the last ocean level |
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113 | # if defined key_vectopt_loop |
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114 | jj = 1 |
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115 | DO ji = 1, jpij-jpi ! vector opt. (forced unrolled) |
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116 | # else |
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117 | DO jj = 1, jpjm1 |
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118 | DO ji = 1, jpim1 |
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119 | # endif |
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120 | ! last level |
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121 | iku = mbatu(ji,jj) |
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122 | ikv = mbatv(ji,jj) |
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123 | ze3wu = fse3w(ji+1,jj ,iku) - fse3w(ji,jj,iku) |
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124 | ze3wv = fse3w(ji ,jj+1,ikv) - fse3w(ji,jj,ikv) |
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125 | |
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126 | ! i- direction |
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127 | IF( ze3wu >= 0. ) THEN ! case 1 |
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128 | ! interpolated values of T and S |
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129 | zmaxu = ze3wu / fse3w(ji+1,jj,iku) |
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130 | zti(ji,jj) = ptem(ji+1,jj,iku) + zmaxu * ( ptem(ji+1,jj,iku-1) - ptem(ji+1,jj,iku) ) |
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131 | zsi(ji,jj) = psal(ji+1,jj,iku) + zmaxu * ( psal(ji+1,jj,iku-1) - psal(ji+1,jj,iku) ) |
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132 | ! depth of the partial step level |
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133 | zhgi(ji,jj) = fsdept(ji,jj,iku) |
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134 | ! gradient of T and S |
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135 | pgtu(ji,jj) = umask(ji,jj,1) * ( zti(ji,jj) - ptem(ji,jj,iku) ) |
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136 | pgsu(ji,jj) = umask(ji,jj,1) * ( zsi(ji,jj) - psal(ji,jj,iku) ) |
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137 | |
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138 | ELSE ! case 2 |
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139 | ! interpolated values of T and S |
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140 | zmaxu = -ze3wu / fse3w(ji,jj,iku) |
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141 | zti(ji,jj) = ptem(ji,jj,iku) + zmaxu * ( ptem(ji,jj,iku-1) - ptem(ji,jj,iku) ) |
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142 | zsi(ji,jj) = psal(ji,jj,iku) + zmaxu * ( psal(ji,jj,iku-1) - psal(ji,jj,iku) ) |
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143 | ! depth of the partial step level |
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144 | zhgi(ji,jj) = fsdept(ji+1,jj,iku) |
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145 | ! gradient of T and S |
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146 | pgtu(ji,jj) = umask(ji,jj,1) * ( ptem(ji+1,jj,iku) - zti (ji,jj) ) |
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147 | pgsu(ji,jj) = umask(ji,jj,1) * ( psal(ji+1,jj,iku) - zsi (ji,jj) ) |
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148 | ENDIF |
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149 | |
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150 | ! j- direction |
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151 | IF( ze3wv >= 0. ) THEN ! case 1 |
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152 | ! interpolated values of T and S |
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153 | zmaxv = ze3wv / fse3w(ji,jj+1,ikv) |
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154 | ztj(ji,jj) = ptem(ji,jj+1,ikv) + zmaxv * ( ptem(ji,jj+1,ikv-1) - ptem(ji,jj+1,ikv) ) |
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155 | zsj(ji,jj) = psal(ji,jj+1,ikv) + zmaxv * ( psal(ji,jj+1,ikv-1) - psal(ji,jj+1,ikv) ) |
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156 | ! depth of the partial step level |
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157 | zhgj(ji,jj) = fsdept(ji,jj,ikv) |
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158 | ! gradient of T and S |
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159 | pgtv(ji,jj) = vmask(ji,jj,1) * ( ztj(ji,jj) - ptem(ji,jj,ikv) ) |
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160 | pgsv(ji,jj) = vmask(ji,jj,1) * ( zsj(ji,jj) - psal(ji,jj,ikv) ) |
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161 | |
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162 | ELSE ! case 2 |
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163 | ! interpolated values of T and S |
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164 | zmaxv = -ze3wv / fse3w(ji,jj,ikv) |
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165 | ztj(ji,jj) = ptem(ji,jj,ikv) + zmaxv * ( ptem(ji,jj,ikv-1) - ptem(ji,jj,ikv) ) |
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166 | zsj(ji,jj) = psal(ji,jj,ikv) + zmaxv * ( psal(ji,jj,ikv-1) - psal(ji,jj,ikv) ) |
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167 | ! depth of the partial step level |
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168 | zhgj(ji,jj) = fsdept(ji,jj+1,ikv) |
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169 | ! gradient of T and S |
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170 | pgtv(ji,jj) = vmask(ji,jj,1) * ( ptem(ji,jj+1,ikv) - ztj(ji,jj) ) |
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171 | pgsv(ji,jj) = vmask(ji,jj,1) * ( psal(ji,jj+1,ikv) - zsj(ji,jj) ) |
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172 | ENDIF |
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173 | # if ! defined key_vectopt_loop |
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174 | END DO |
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175 | # endif |
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176 | END DO |
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177 | |
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178 | ! Compute interpolated rd from zti, zsi, ztj, zsj for the 2 cases at the depth of the partial |
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179 | ! step and store it in zri, zrj for each case |
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180 | CALL eos( zti, zsi, zhgi, zri ) |
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181 | CALL eos( ztj, zsj, zhgj, zrj ) |
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182 | |
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183 | |
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184 | ! Gradient of density at the last level |
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185 | # if defined key_vectopt_loop |
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186 | jj = 1 |
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187 | DO ji = 1, jpij-jpi ! vector opt. (forced unrolled) |
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188 | # else |
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189 | DO jj = 1, jpjm1 |
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190 | DO ji = 1, jpim1 |
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191 | # endif |
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192 | iku = mbatu(ji,jj) |
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193 | ikv = mbatv(ji,jj) |
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194 | ze3wu = fse3w(ji+1,jj ,iku) - fse3w(ji,jj,iku) |
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195 | ze3wv = fse3w(ji ,jj+1,ikv) - fse3w(ji,jj,ikv) |
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196 | IF( ze3wu >= 0. ) THEN ! i-direction: case 1 |
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197 | pgru(ji,jj) = umask(ji,jj,1) * ( zri(ji,jj) - prd(ji,jj,iku) ) |
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198 | ELSE ! i-direction: case 2 |
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199 | pgru(ji,jj) = umask(ji,jj,1) * ( prd(ji+1,jj,iku) - zri(ji,jj) ) |
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200 | ENDIF |
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201 | IF( ze3wv >= 0. ) THEN ! j-direction: case 1 |
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202 | pgrv(ji,jj) = vmask(ji,jj,1) * ( zrj(ji,jj) - prd(ji,jj,ikv) ) |
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203 | ELSE ! j-direction: case 2 |
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204 | pgrv(ji,jj) = vmask(ji,jj,1) * ( prd(ji,jj+1,ikv) - zrj(ji,jj) ) |
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205 | ENDIF |
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206 | # if ! defined key_vectopt_loop |
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207 | END DO |
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208 | # endif |
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209 | END DO |
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210 | |
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211 | ! Lateral boundary conditions on each gradient |
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212 | CALL lbc_lnk( pgtu , 'U', -1. ) ; CALL lbc_lnk( pgtv , 'V', -1. ) |
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213 | CALL lbc_lnk( pgsu , 'U', -1. ) ; CALL lbc_lnk( pgsv , 'V', -1. ) |
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214 | CALL lbc_lnk( pgru , 'U', -1. ) ; CALL lbc_lnk( pgrv , 'V', -1. ) |
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215 | |
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216 | END SUBROUTINE zps_hde |
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217 | |
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218 | #if defined key_top |
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219 | !!---------------------------------------------------------------------- |
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220 | !! 'key_top' TOP models |
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221 | !!---------------------------------------------------------------------- |
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222 | SUBROUTINE zps_hde_trc ( kt, kjpt, ptra, pgtru, pgtrv ) |
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223 | !!---------------------------------------------------------------------- |
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224 | !! *** ROUTINE zps_hde_trc *** |
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225 | !! |
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226 | !! ** Purpose : Compute the horizontal derivative of passive tracers |
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227 | !! TRA at u- and v-points with a linear interpolation for z-coordinate |
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228 | !! with partial steps. |
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229 | !! |
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230 | !! ** Method : the same for T & S |
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231 | !! |
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232 | !! ** Action : - pgtru : horizontal gradient of TRA at U-points |
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233 | !! - pgtrv : horizontal gradient of TRA at V-points |
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234 | !!---------------------------------------------------------------------- |
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235 | !! * Arguments |
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236 | INTEGER , INTENT( in ) :: kt ! ocean time-step index |
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237 | INTEGER , INTENT( in ) :: kjpt ! number of tracers |
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238 | REAL(wp), DIMENSION(jpi,jpj,jpk,kjpt), INTENT( in ) :: ptra ! 4D tracers fields |
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239 | REAL(wp), DIMENSION(jpi,jpj, kjpt), INTENT( out ) :: pgtru, pgtrv ! horizontal grad. of TRA u- and v-points |
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240 | !! * Local declarations |
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241 | INTEGER :: ji, jj, jn ! Dummy loop indices |
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242 | INTEGER :: iku, ikv ! partial step level at u- and v-points |
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243 | REAL(wp) :: ztrai, ztraj, ze3wu, ze3wv, zmaxu, zmaxv ! temporary scalars |
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244 | !!---------------------------------------------------------------------- |
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245 | |
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246 | DO jn = 1, kjpt |
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247 | ! Interpolation of passive tracers at the last ocean level |
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248 | # if defined key_vectopt_loop |
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249 | jj = 1 |
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250 | DO ji = 1, jpij-jpi ! vector opt. (forced unrolled) |
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251 | # else |
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252 | DO jj = 1, jpjm1 |
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253 | DO ji = 1, jpim1 |
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254 | # endif |
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255 | ! last level |
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256 | iku = mbatu(ji,jj) |
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257 | ikv = mbatv(ji,jj) |
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258 | ze3wu = fse3w(ji+1,jj ,iku) - fse3w(ji,jj,iku) |
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259 | ze3wv = fse3w(ji ,jj+1,ikv) - fse3w(ji,jj,ikv) |
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260 | |
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261 | ! i- direction |
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262 | IF( ze3wu >= 0. ) THEN ! case 1 |
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263 | zmaxu = ze3wu / fse3w(ji+1,jj,iku) |
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264 | ! interpolated values of passive tracers |
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265 | ztrai = ptra(ji+1,jj,iku,jn) + zmaxu * ( ptra(ji+1,jj,iku-1,jn) - ptra(ji+1,jj,iku,jn) ) |
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266 | ! gradient of passive tracers |
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267 | pgtru(ji,jj,jn) = umask(ji,jj,1) * ( ztrai - ptra(ji,jj,iku,jn) ) |
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268 | ELSE ! case 2 |
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269 | zmaxu = -ze3wu / fse3w(ji,jj,iku) |
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270 | ! interpolated values of passive tracers |
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271 | ztrai = ptra(ji,jj,iku,jn) + zmaxu * ( ptra(ji,jj,iku-1,jn) - ptra(ji,jj,iku,jn) ) |
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272 | ! gradient of passive tracers |
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273 | pgtru(ji,jj,jn) = umask(ji,jj,1) * ( ptra(ji+1,jj,iku,jn) - ztrai ) |
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274 | ENDIF |
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275 | |
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276 | ! j- direction |
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277 | IF( ze3wv >= 0. ) THEN ! case 1 |
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278 | zmaxv = ze3wv / fse3w(ji,jj+1,ikv) |
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279 | ! interpolated values of passive tracers |
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280 | ztraj = ptra(ji,jj+1,ikv,jn) + zmaxv * ( ptra(ji,jj+1,ikv-1,jn) - ptra(ji,jj+1,ikv,jn) ) |
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281 | ! gradient of passive tracers |
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282 | pgtrv(ji,jj,jn) = vmask(ji,jj,1) * ( ztraj - ptra(ji,jj,ikv,jn) ) |
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283 | ELSE ! case 2 |
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284 | zmaxv = -ze3wv / fse3w(ji,jj,ikv) |
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285 | ! interpolated values of passive tracers |
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286 | ztraj = ptra(ji,jj,ikv,jn) + zmaxv * ( ptra(ji,jj,ikv-1,jn) - ptra(ji,jj,ikv,jn) ) |
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287 | ! gradient of passive tracers |
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288 | pgtrv(ji,jj,jn) = vmask(ji,jj,1) * ( ptra(ji,jj+1,ikv,jn) - ztraj ) |
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289 | ENDIF |
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290 | # if ! defined key_vectopt_loop |
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291 | END DO |
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292 | # endif |
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293 | END DO |
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294 | |
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295 | ! Lateral boundary conditions on each gradient |
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296 | CALL lbc_lnk( pgtru(:,:,jn) , 'U', -1. ) |
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297 | CALL lbc_lnk( pgtrv(:,:,jn) , 'V', -1. ) |
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298 | |
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299 | END DO |
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300 | |
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301 | END SUBROUTINE zps_hde_trc |
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302 | #endif |
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303 | |
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304 | SUBROUTINE zps_hde_init |
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305 | !!---------------------------------------------------------------------- |
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306 | !! *** ROUTINE zps_hde_init *** |
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307 | !! |
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308 | !! ** Purpose : Computation of bottom ocean level index at U- and V-points |
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309 | !! |
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310 | !!---------------------------------------------------------------------- |
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311 | !! * Local declarations |
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312 | INTEGER :: ji, jj ! Dummy loop indices |
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313 | REAL(wp), DIMENSION(jpi,jpj) :: zti, ztj ! temporary arrays |
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314 | !!---------------------------------------------------------------------- |
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315 | |
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316 | mbatu(:,:) = 0 |
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317 | mbatv(:,:) = 0 |
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318 | DO jj = 1, jpjm1 |
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319 | DO ji = 1, fs_jpim1 ! vector opt. |
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320 | mbatu(ji,jj) = MAX( MIN( mbathy(ji,jj), mbathy(ji+1,jj ) ) - 1, 2 ) |
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321 | mbatv(ji,jj) = MAX( MIN( mbathy(ji,jj), mbathy(ji ,jj+1) ) - 1, 2 ) |
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322 | END DO |
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323 | END DO |
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324 | zti(:,:) = FLOAT( mbatu(:,:) ) |
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325 | ztj(:,:) = FLOAT( mbatv(:,:) ) |
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326 | ! lateral boundary conditions: T-point, sign unchanged |
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327 | CALL lbc_lnk( zti , 'U', 1. ) |
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328 | CALL lbc_lnk( ztj , 'V', 1. ) |
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329 | mbatu(:,:) = MAX( INT( zti(:,:) ), 2 ) |
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330 | mbatv(:,:) = MAX( INT( ztj(:,:) ), 2 ) |
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331 | |
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332 | END SUBROUTINE zps_hde_init |
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333 | !!====================================================================== |
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334 | END MODULE zpshde |
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