1 | MODULE tranpc |
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2 | !!============================================================================== |
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3 | !! *** MODULE tranpc *** |
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4 | !! Ocean active tracers: non penetrative convection scheme |
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5 | !!============================================================================== |
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6 | !! History : 1.0 ! 1990-09 (G. Madec) Original code |
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7 | !! ! 1996-01 (G. Madec) statement function for e3 |
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8 | !! NEMO 1.0 ! 2002-06 (G. Madec) free form F90 |
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9 | !! 3.0 ! 2008-06 (G. Madec) applied on ta, sa and called before tranxt in step.F90 |
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10 | !!---------------------------------------------------------------------- |
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11 | |
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12 | !!---------------------------------------------------------------------- |
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13 | !! tra_npc : apply the non penetrative convection scheme |
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14 | !!---------------------------------------------------------------------- |
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15 | USE oce ! ocean dynamics and active tracers |
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16 | USE dom_oce ! ocean space and time domain |
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17 | USE zdf_oce ! ocean vertical physics |
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18 | USE trdmod ! ocean active tracer trends |
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19 | USE trdmod_oce ! ocean variables trends |
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20 | USE eosbn2 ! equation of state (eos routine) |
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21 | USE lbclnk ! lateral boundary conditions (or mpp link) |
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22 | USE in_out_manager ! I/O manager |
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23 | |
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24 | IMPLICIT NONE |
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25 | PRIVATE |
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26 | |
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27 | PUBLIC tra_npc ! routine called by step.F90 |
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28 | |
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29 | !! * Substitutions |
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30 | # include "domzgr_substitute.h90" |
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31 | !!---------------------------------------------------------------------- |
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32 | !! NEMO/OPA 3.2 , LOCEAN-IPSL (2009) |
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33 | !! $Id$ |
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34 | !! Software governed by the CeCILL licence (modipsl/doc/NEMO_CeCILL.txt) |
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35 | !!---------------------------------------------------------------------- |
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36 | |
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37 | CONTAINS |
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38 | |
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39 | SUBROUTINE tra_npc( kt ) |
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40 | !!---------------------------------------------------------------------- |
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41 | !! *** ROUTINE tranpc *** |
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42 | !! |
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43 | !! ** Purpose : Non penetrative convective adjustment scheme. solve |
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44 | !! the static instability of the water column on after fields |
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45 | !! while conserving heat and salt contents. |
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46 | !! |
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47 | !! ** Method : The algorithm used converges in a maximium of jpk |
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48 | !! iterations. instabilities are treated when the vertical density |
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49 | !! gradient is less than 1.e-5. |
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50 | !! l_trdtra=T: the trend associated with this algorithm is saved. |
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51 | !! |
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52 | !! ** Action : - (ta,sa) after the application od the npc scheme |
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53 | !! - save the associated trends (ttrd,strd) ('key_trdtra') |
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54 | !! |
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55 | !! References : Madec, et al., 1991, JPO, 21, 9, 1349-1371. |
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56 | !!---------------------------------------------------------------------- |
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57 | USE oce, ONLY : ztrdt => ua ! use ua as 3D workspace |
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58 | USE oce, ONLY : ztrds => va ! use va as 3D workspace |
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59 | !! |
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60 | INTEGER, INTENT(in) :: kt ! ocean time-step index |
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61 | !! |
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62 | INTEGER :: ji, jj, jk ! dummy loop indices |
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63 | INTEGER :: inpcc ! number of statically instable water column |
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64 | INTEGER :: inpci ! number of iteration for npc scheme |
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65 | INTEGER :: jiter, jkdown, jkp ! ??? |
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66 | INTEGER :: ikbot, ik, ikup, ikdown ! ??? |
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67 | REAL(wp) :: ze3tot, zta, zsa, zraua, ze3dwn |
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68 | REAL(wp), DIMENSION(jpi,jpk) :: zwx, zwy, zwz ! 2D arrays |
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69 | REAL(wp), DIMENSION(jpi,jpj,jpk) :: zrhop ! 3D arrays |
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70 | !!---------------------------------------------------------------------- |
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71 | |
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72 | IF( MOD( kt, nn_npc ) == 0 ) THEN |
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73 | |
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74 | inpcc = 0 |
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75 | inpci = 0 |
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76 | |
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77 | CALL eos( ta, sa, rhd, zrhop ) ! Potential density |
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78 | |
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79 | |
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80 | IF( l_trdtra ) THEN ! Save ta and sa trends |
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81 | ztrdt(:,:,:) = ta(:,:,:) |
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82 | ztrds(:,:,:) = sa(:,:,:) |
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83 | ENDIF |
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84 | |
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85 | ! ! =============== |
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86 | DO jj = 1, jpj ! Vertical slab |
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87 | ! ! =============== |
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88 | ! Static instability pointer |
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89 | ! ---------------------------- |
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90 | DO jk = 1, jpkm1 |
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91 | DO ji = 1, jpi |
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92 | zwx(ji,jk) = ( zrhop(ji,jj,jk) - zrhop(ji,jj,jk+1) ) * tmask(ji,jj,jk+1) |
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93 | END DO |
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94 | END DO |
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95 | |
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96 | ! 1.1 do not consider the boundary points |
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97 | |
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98 | ! even if east-west cyclic b. c. do not considere ji=1 or jpi |
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99 | DO jk = 1, jpkm1 |
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100 | zwx( 1 ,jk) = 0.e0 |
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101 | zwx(jpi,jk) = 0.e0 |
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102 | END DO |
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103 | ! even if south-symmetric b. c. used, do not considere jj=1 |
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104 | IF( jj == 1 ) zwx(:,:) = 0.e0 |
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105 | |
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106 | DO jk = 1, jpkm1 |
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107 | DO ji = 1, jpi |
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108 | zwx(ji,jk) = 1. |
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109 | IF( zwx(ji,jk) < 1.e-5 ) zwx(ji,jk) = 0.e0 |
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110 | END DO |
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111 | END DO |
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112 | |
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113 | zwy(:,1) = 0.e0 |
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114 | DO ji = 1, jpi |
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115 | DO jk = 1, jpkm1 |
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116 | zwy(ji,1) = zwy(ji,1) + zwx(ji,jk) |
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117 | END DO |
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118 | END DO |
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119 | |
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120 | zwz(1,1) = 0.e0 |
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121 | DO ji = 1, jpi |
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122 | zwz(1,1) = zwz(1,1) + zwy(ji,1) |
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123 | END DO |
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124 | |
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125 | inpcc = inpcc + NINT( zwz(1,1) ) |
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126 | |
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127 | |
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128 | ! 2. Vertical mixing for each instable portion of the density profil |
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129 | ! ------------------------------------------------------------------ |
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130 | |
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131 | IF( zwz(1,1) /= 0.e0 ) THEN ! -->> the density profil is statically instable : |
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132 | DO ji = 1, jpi |
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133 | IF( zwy(ji,1) /= 0.e0 ) THEN |
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134 | ! |
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135 | ikbot = mbathy(ji,jj) ! ikbot: ocean bottom level |
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136 | ! |
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137 | DO jiter = 1, jpk ! vertical iteration |
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138 | ! |
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139 | ! search of ikup : the first static instability from the sea surface |
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140 | ! |
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141 | ik = 0 |
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142 | 220 CONTINUE |
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143 | ik = ik + 1 |
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144 | IF( ik >= ikbot-1 ) GO TO 200 |
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145 | zwx(ji,ik) = zrhop(ji,jj,ik) - zrhop(ji,jj,ik+1) |
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146 | IF( zwx(ji,ik) <= 0.e0 ) GO TO 220 |
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147 | ikup = ik |
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148 | ! the density profil is instable below ikup |
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149 | ! ikdown : bottom of the instable portion of the density profil |
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150 | ! search of ikdown and vertical mixing from ikup to ikdown |
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151 | ! |
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152 | ze3tot= fse3t(ji,jj,ikup) |
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153 | zta = ta (ji,jj,ikup) |
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154 | zsa = sa (ji,jj,ikup) |
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155 | zraua = zrhop(ji,jj,ikup) |
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156 | ! |
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157 | DO jkdown = ikup+1, ikbot-1 |
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158 | IF( zraua <= zrhop(ji,jj,jkdown) ) THEN |
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159 | ikdown = jkdown |
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160 | GO TO 240 |
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161 | ENDIF |
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162 | ze3dwn = fse3t(ji,jj,jkdown) |
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163 | ze3tot = ze3tot + ze3dwn |
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164 | zta = ( zta*(ze3tot-ze3dwn) + ta(ji,jj,jkdown)*ze3dwn )/ze3tot |
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165 | zsa = ( zsa*(ze3tot-ze3dwn) + sa(ji,jj,jkdown)*ze3dwn )/ze3tot |
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166 | zraua = ( zraua*(ze3tot-ze3dwn) + zrhop(ji,jj,jkdown)*ze3dwn )/ze3tot |
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167 | inpci = inpci+1 |
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168 | END DO |
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169 | ikdown = ikbot-1 |
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170 | 240 CONTINUE |
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171 | ! |
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172 | DO jkp = ikup, ikdown-1 |
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173 | ta(ji,jj,jkp) = zta |
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174 | sa(ji,jj,jkp) = zsa |
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175 | zrhop(ji,jj,jkp) = zraua |
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176 | END DO |
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177 | IF (ikdown == ikbot-1 .AND. zraua >= zrhop(ji,jj,ikdown) ) THEN |
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178 | ta(ji,jj,ikdown) = zta |
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179 | sa(ji,jj,ikdown) = zsa |
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180 | zrhop(ji,jj,ikdown) = zraua |
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181 | ENDIF |
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182 | END DO |
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183 | ENDIF |
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184 | 200 CONTINUE |
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185 | END DO |
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186 | ! <<-- no more static instability on slab jj |
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187 | ENDIF |
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188 | ! ! =============== |
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189 | END DO ! End of slab |
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190 | ! ! =============== |
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191 | ! |
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192 | IF( l_trdtra ) THEN ! save the Non penetrative mixing trends for diagnostic |
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193 | ztrdt(:,:,:) = ta(:,:,:) - ztrdt(:,:,:) |
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194 | ztrds(:,:,:) = sa(:,:,:) - ztrds(:,:,:) |
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195 | CALL trd_mod(ztrdt, ztrds, jptra_trd_npc, 'TRA', kt) |
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196 | ENDIF |
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197 | |
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198 | ! Lateral boundary conditions on ( ta, sa ) ( Unchanged sign) |
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199 | ! ------------------------------============ |
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200 | CALL lbc_lnk( ta, 'T', 1. ) |
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201 | CALL lbc_lnk( sa, 'T', 1. ) |
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202 | |
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203 | |
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204 | ! 2. non penetrative convective scheme statistics |
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205 | ! ----------------------------------------------- |
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206 | IF( nn_npcp /= 0 .AND. MOD( kt, nn_npcp ) == 0 ) THEN |
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207 | IF(lwp) WRITE(numout,*)' kt=',kt, ' number of statically instable', & |
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208 | & ' water column : ',inpcc, ' number of iteration : ',inpci |
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209 | ENDIF |
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210 | ! |
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211 | ENDIF |
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212 | ! |
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213 | END SUBROUTINE tra_npc |
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214 | |
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215 | !!====================================================================== |
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216 | END MODULE tranpc |
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