1 | MODULE zdfevd |
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2 | !!====================================================================== |
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3 | !! *** MODULE zdfevd *** |
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4 | !! Ocean physics: parameterization of convection through an enhancement |
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5 | !! of vertical eddy mixing coefficient |
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6 | !!====================================================================== |
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7 | |
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8 | !!---------------------------------------------------------------------- |
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9 | !! zdf_evd : update momentum and tracer Kz at the location of |
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10 | !! statically unstable portion of the water column |
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11 | !! (called if ln_zdfevd=T) |
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12 | !!---------------------------------------------------------------------- |
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13 | !! * Modules used |
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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 zdf_oce ! ocean vertical physics variables |
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17 | USE zdfkpp ! KPP vertical mixing |
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18 | USE in_out_manager ! I/O manager |
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19 | USE lbclnk ! ocean lateral boundary conditions (or mpp link) |
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20 | |
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21 | IMPLICIT NONE |
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22 | PRIVATE |
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23 | |
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24 | !! * Routine accessibility |
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25 | PUBLIC zdf_evd ! called by step.F90 |
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26 | |
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27 | !! * Substitutions |
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28 | # include "domzgr_substitute.h90" |
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29 | !!---------------------------------------------------------------------- |
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30 | !! OPA 9.0 , LOCEAN-IPSL (2005) |
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31 | !! $Header$ |
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32 | !! This software is governed by the CeCILL licence see modipsl/doc/NEMO_CeCILL.txt |
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33 | !!---------------------------------------------------------------------- |
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34 | |
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35 | CONTAINS |
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36 | |
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37 | SUBROUTINE zdf_evd( kt ) |
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38 | !!---------------------------------------------------------------------- |
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39 | !! *** ROUTINE zdf_evd *** |
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40 | !! |
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41 | !! ** Purpose : Local increased the vertical eddy viscosity and diffu- |
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42 | !! sivity coefficients when a static instability is encountered. |
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43 | !! |
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44 | !! ** Method : avt, and the 4 neighbouring avmu, avmv coefficients |
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45 | !! are set to avevd (namelist parameter) if the water column is |
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46 | !! statically unstable (i.e. if rn2 < -1.e-12 ) |
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47 | !! |
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48 | !! ** Action : Update avt, avmu, avmv in statically instable cases |
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49 | !! and avt_evd which is avt due to convection |
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50 | !! References : |
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51 | !! Lazar, A., these de l'universite Paris VI, France, 1997 |
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52 | !! History : |
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53 | !! 7.0 ! 97-06 (G. Madec, A. Lazar) Original code |
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54 | !! 8.5 ! 02-06 (G. Madec) F90: Free form and module |
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55 | !! 9.0 ! 05-06 (C. Ethe) KPP parameterization |
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56 | !!---------------------------------------------------------------------- |
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57 | !! * Arguments |
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58 | INTEGER, INTENT( in ) :: kt ! ocean time-step indexocean time step |
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59 | |
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60 | !! * Local declarations |
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61 | INTEGER :: ji, jj, jk ! dummy loop indices |
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62 | !!---------------------------------------------------------------------- |
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63 | |
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64 | IF( kt == nit000 ) THEN |
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65 | IF(lwp) WRITE(numout,*) |
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66 | IF(lwp) WRITE(numout,*) 'zdf_evd : Enhanced Vertical Diffusion (evd)' |
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67 | IF(lwp) WRITE(numout,*) '~~~~~~~ ' |
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68 | IF(lwp) WRITE(numout,*) |
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69 | ENDIF |
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70 | |
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71 | ! Initialisation of avt_evd (vertical diffusion due to convection) to avt and avmu_evd to avmu |
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72 | avt_evd (:,:,:) = avt(:,:,:) |
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73 | avmu_evd (:,:,:) = avmu(:,:,:) |
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74 | |
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75 | SELECT CASE ( n_evdm ) |
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76 | |
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77 | CASE ( 1 ) ! enhance vertical eddy viscosity and diffusivity (if rn2<-1.e-12) |
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78 | ! ! =============== |
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79 | DO jk = 1, jpkm1 ! Horizontal slab |
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80 | ! ! =============== |
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81 | # if defined key_vectopt_loop && ! defined key_mpp_omp |
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82 | !!! WHERE( rn2(:,:,jk) <= -1.e-12 ) avt(:,:,jk) = tmask(:,:,jk) * avevd ! agissant sur T SEUL! |
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83 | jj = 1 ! big loop forced |
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84 | DO ji = jpi+2, jpij |
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85 | # if defined key_zdfkpp |
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86 | !! no implicit mixing in the boundary layer with KPP |
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87 | IF( ( rn2(ji,jj,jk) <= -1.e-12 ) .AND. ( fsdepw(ji,jj,jk) > hkpp(ji,jj) ) ) THEN |
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88 | # else |
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89 | IF( rn2(ji,jj,jk) <= -1.e-12 ) THEN |
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90 | # endif |
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91 | avt (ji ,jj ,jk) = avevd * tmask(ji ,jj ,jk) |
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92 | avmu(ji ,jj ,jk) = avevd * umask(ji ,jj ,jk) |
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93 | avmu(ji-1,jj ,jk) = avevd * umask(ji-1,jj ,jk) |
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94 | avmv(ji ,jj ,jk) = avevd * vmask(ji ,jj ,jk) |
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95 | avmv(ji ,jj-1,jk) = avevd * vmask(ji ,jj-1,jk) |
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96 | ENDIF |
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97 | END DO |
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98 | # else |
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99 | DO jj = 2, jpj ! no vector opt. |
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100 | DO ji = 2, jpi |
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101 | # if defined key_zdfkpp |
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102 | !! no implicit mixing in the boundary layer with KPP |
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103 | IF( ( rn2(ji,jj,jk) <= -1.e-12 ) .AND. ( fsdepw(ji,jj,jk) > hkpp(ji,jj) ) ) THEN |
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104 | # else |
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105 | IF( rn2(ji,jj,jk) <= -1.e-12 ) THEN |
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106 | # endif |
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107 | avt (ji ,jj ,jk) = avevd * tmask(ji ,jj ,jk) |
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108 | avmu(ji ,jj ,jk) = avevd * umask(ji ,jj ,jk) |
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109 | avmu(ji-1,jj ,jk) = avevd * umask(ji-1,jj ,jk) |
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110 | avmv(ji ,jj ,jk) = avevd * vmask(ji ,jj ,jk) |
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111 | avmv(ji ,jj-1,jk) = avevd * vmask(ji ,jj-1,jk) |
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112 | ENDIF |
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113 | END DO |
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114 | END DO |
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115 | # endif |
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116 | ! ! =============== |
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117 | END DO ! End of slab |
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118 | ! ! =============== |
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119 | |
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120 | ! Lateral boundary conditions on ( avt, avmu, avmv ) (unchanged sign) |
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121 | ! -------------------------------=================== |
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122 | CALL lbc_lnk( avt , 'W', 1. ) |
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123 | CALL lbc_lnk( avmu, 'U', 1. ) |
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124 | CALL lbc_lnk( avmv, 'V', 1. ) |
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125 | |
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126 | CASE DEFAULT ! enhance vertical eddy diffusivity only (if rn2<-1.e-12) |
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127 | ! ! =============== |
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128 | DO jk = 1, jpkm1 ! Horizontal slab |
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129 | ! ! =============== |
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130 | !!! WHERE( rn2(:,:,jk) <= -1.e-12 ) avt(:,:,jk) = tmask(:,:,jk) * avevd ! agissant sur T SEUL! |
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131 | # if defined key_vectopt_loop && ! defined key_mpp_omp |
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132 | jj = 1 ! big loop forced |
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133 | DO ji = 1, jpij |
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134 | # if defined key_zdfkpp |
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135 | !! no implicit mixing in the boundary layer with KPP |
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136 | IF( ( rn2(ji,jj,jk) <= -1.e-12 ) .AND. ( fsdepw(ji,jj,jk) > hkpp(ji,jj) ) ) & |
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137 | avt(ji,jj,jk) = avevd * tmask(ji,jj,jk) |
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138 | # else |
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139 | IF( rn2(ji,jj,jk) <= -1.e-12 ) avt(ji,jj,jk) = avevd * tmask(ji,jj,jk) |
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140 | # endif |
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141 | END DO |
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142 | # else |
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143 | DO jj = 1, jpj ! loop over the whole domain (no lbc_lnk call) |
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144 | DO ji = 1, jpi |
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145 | # if defined key_zdfkpp |
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146 | !! no implicit mixing in the boundary layer with KPP |
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147 | IF( ( rn2(ji,jj,jk) <= -1.e-12 ) .AND. ( fsdepw(ji,jj,jk) > hkpp(ji,jj) ) ) & |
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148 | avt(ji,jj,jk) = avevd * tmask(ji,jj,jk) |
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149 | # else |
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150 | IF( rn2(ji,jj,jk) <= -1.e-12 ) avt(ji,jj,jk) = avevd * tmask(ji,jj,jk) |
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151 | # endif |
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152 | END DO |
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153 | END DO |
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154 | # endif |
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155 | ! ! =============== |
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156 | END DO ! End of slab |
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157 | ! ! =============== |
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158 | END SELECT |
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159 | |
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160 | ! update of avt_evd and avmu_evd |
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161 | avt_evd (:,:,:) = avt (:,:,:) - avt_evd (:,:,:) |
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162 | avmu_evd (:,:,:) = avmu(:,:,:) - avmu_evd (:,:,:) |
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163 | |
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164 | END SUBROUTINE zdf_evd |
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165 | |
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166 | !!====================================================================== |
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167 | END MODULE zdfevd |
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