1 | MODULE limflx |
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2 | !!====================================================================== |
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3 | !! *** MODULE limflx *** |
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4 | !! computation of the flux at the sea ice/ocean interface |
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5 | !!====================================================================== |
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6 | #if defined key_lim3 |
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7 | !!---------------------------------------------------------------------- |
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8 | !! 'key_lim3' LIM3 sea-ice model |
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9 | !!---------------------------------------------------------------------- |
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10 | !! lim_flx : flux at the ice / ocean interface |
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11 | !! * Modules used |
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12 | USE par_oce |
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13 | USE phycst |
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14 | USE ocfzpt |
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15 | USE ice_oce |
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16 | USE flx_oce |
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17 | USE dom_oce |
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18 | USE ice |
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19 | USE flxblk |
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20 | USE lbclnk |
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21 | USE in_out_manager |
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22 | USE albedo |
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23 | USE par_ice |
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24 | USE prtctl ! Print control |
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25 | |
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26 | IMPLICIT NONE |
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27 | PRIVATE |
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28 | |
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29 | !! * Routine accessibility |
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30 | PUBLIC lim_flx ! called by lim_step |
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31 | |
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32 | !! * Module variables |
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33 | REAL(wp) :: & ! constant values |
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34 | epsi16 = 1e-16 , & |
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35 | rzero = 0.0 , & |
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36 | rone = 1.0 |
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37 | !! * Substitutions |
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38 | # include "vectopt_loop_substitute.h90" |
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39 | !!---------------------------------------------------------------------- |
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40 | !! LIM 2.0, UCL-LOCEAN-IPSL (2005) |
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41 | !! $Header: /home/opalod/NEMOCVSROOT/NEMO/LIM_SRC/limflx.F90,v 1.6 2005/03/27 18:34:41 opalod Exp $ |
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42 | !! This software is governed by the CeCILL licence see modipsl/doc/NEMO_CeCILL.txt |
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43 | !!---------------------------------------------------------------------- |
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44 | CONTAINS |
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45 | |
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46 | SUBROUTINE lim_flx |
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47 | !!------------------------------------------------------------------- |
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48 | !! *** ROUTINE lim_flx *** |
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49 | !! |
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50 | !! |
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51 | !! ** Purpose : Computes the mass and heat fluxes to the ocean |
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52 | !! |
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53 | !! ** Action : - Initialisation of some variables |
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54 | !! - comput. of the fluxes at the sea ice/ocean interface |
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55 | !! |
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56 | !! ** Outputs : - fsolar : solar heat flux at sea ice/ocean interface |
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57 | !! - fnsolar : non solar heat flux |
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58 | !! - fsalt : salt flux at sea ice/ocean interface |
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59 | !! - fmass : freshwater flux at sea ice/ocean interface |
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60 | !! |
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61 | !! |
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62 | !! ** References : |
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63 | !! H. Goosse et al. 1996, Bul. Soc. Roy. Sc. Liege, 65, 87-90 |
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64 | !! original : 00-01 (LIM) |
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65 | !! addition : 02-07 (C. Ethe, G. Madec) |
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66 | !!--------------------------------------------------------------------- |
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67 | |
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68 | !! * Modules used |
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69 | !! * Local variables |
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70 | INTEGER :: ji, jj ! dummy loop indices |
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71 | |
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72 | INTEGER :: & |
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73 | ifvt, i1mfr, idfr , & ! some switches |
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74 | iflt, ial, iadv, ifral, ifrdv |
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75 | |
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76 | REAL(wp) :: & |
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77 | zinda , & ! switch for testing the values of ice concentration |
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78 | !! zfcm1 , & ! solar heat fluxes |
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79 | !! zfcm2 , & ! non solar heat fluxes |
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80 | zfold , & |
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81 | #if defined key_lim_fdd |
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82 | zfons, & ! salt exchanges at the ice/ocean interface |
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83 | zpme ! freshwater exchanges at the ice/ocean interface |
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84 | #else |
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85 | zprs , zfons, & ! salt exchanges at the ice/ocean interface |
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86 | zpmess ! freshwater exchanges at the ice/ocean interface |
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87 | #endif |
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88 | REAL(wp), DIMENSION(jpi,jpj) :: & |
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89 | zfcm1 , & ! solar heat fluxes |
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90 | zfcm2 ! non solar heat fluxes |
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91 | #if defined key_coupled |
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92 | REAL(wp), DIMENSION(jpi,jpj) :: & |
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93 | zalb , & ! albedo of ice under overcast sky |
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94 | zalcn , & ! albedo of ocean under overcast sky |
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95 | zalbp , & ! albedo of ice under clear sky |
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96 | zaldum ! albedo of ocean under clear sky |
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97 | #endif |
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98 | !!--------------------------------------------------------------------- |
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99 | |
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100 | !---------------------------------! |
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101 | ! Sea ice/ocean interface ! |
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102 | !---------------------------------! |
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103 | |
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104 | ! heat flux at the ocean surface |
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105 | !------------------------------------------------------- |
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106 | ! pfrld is the lead fraction at the previous time step (actually between TRP and THD) |
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107 | ! changed to old_frld and old ht_i |
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108 | |
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109 | DO jj = 1, jpj |
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110 | DO ji = 1, jpi |
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111 | zinda = 1.0 - MAX( rzero , SIGN( rone , - ( 1.0 - pfrld(ji,jj) ) ) ) |
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112 | ifvt = zinda * MAX( rzero , SIGN( rone, -phicif (ji,jj) ) ) !subscripts are bad here |
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113 | i1mfr = 1.0 - MAX( rzero , SIGN( rone , - ( at_i(ji,jj) ) ) ) |
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114 | idfr = 1.0 - MAX( rzero , SIGN( rone , ( 1.0 - at_i(ji,jj) ) - pfrld(ji,jj) ) ) |
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115 | iflt = zinda * (1 - i1mfr) * (1 - ifvt ) |
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116 | ial = ifvt * i1mfr + ( 1 - ifvt ) * idfr |
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117 | iadv = ( 1 - i1mfr ) * zinda |
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118 | ifral = ( 1 - i1mfr * ( 1 - ial ) ) |
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119 | ifrdv = ( 1 - ifral * ( 1 - ial ) ) * iadv |
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120 | |
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121 | ! switch --- 1.0 ---------------- 0.0 -------------------- |
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122 | ! ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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123 | ! zinda | if pfrld = 1 | if pfrld < 1 | |
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124 | ! -> ifvt| if pfrld old_ht_i |
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125 | ! i1mfr | if frld = 1 | if frld < 1 | |
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126 | ! idfr | if frld <= pfrld | if frld > pfrld | |
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127 | ! iflt | |
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128 | ! ial | |
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129 | ! iadv | |
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130 | ! ifral |
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131 | ! ifrdv |
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132 | |
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133 | ! computation the solar flux at ocean surface |
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134 | zfcm1(ji,jj) = pfrld(ji,jj) * qsr_oce(ji,jj) + ( 1. - pfrld(ji,jj) ) * fstric(ji,jj) |
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135 | ! fstric Solar flux transmitted trough the ice |
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136 | ! qsr_oce Net short wave heat flux on free ocean |
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137 | ! new line |
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138 | fscmbq(ji,jj) = ( 1.0 - pfrld(ji,jj) ) * fstric(ji,jj) |
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139 | |
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140 | ! computation the non solar heat flux at ocean surface |
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141 | zfcm2(ji,jj) = - zfcm1(ji,jj) & |
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142 | & + iflt * ( fscmbq(ji,jj) ) & ! total abl -> fscmbq is given to the ocean |
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143 | ! fscmbq and ffltbif are obsolete |
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144 | ! & + iflt * ffltbif(ji,jj) !!! only if one category is used |
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145 | & + ifral * ( ial * qcmif(ji,jj) + (1 - ial) * qldif(ji,jj) ) / rdt_ice & |
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146 | & + ifrdv * ( qfvbq(ji,jj) + qdtcn(ji,jj) ) / rdt_ice & |
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147 | & + fhmec(ji,jj) & ! new contribution due to snow melt in ridging!! |
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148 | & + fheat_rpo(ji,jj) & ! contribution from ridge formation |
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149 | & + fheat_res(ji,jj) |
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150 | ! fscmbq Part of the solar radiation transmitted through the ice and going to the ocean |
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151 | ! computed in limthd_zdf.F90 |
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152 | ! ffltbif Total heat content of the ice (brine pockets+ice) / delta_t |
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153 | ! qcmif Energy needed to bring the ocean surface layer until its freezing (ok) |
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154 | ! qldif heat balance of the lead (or of the open ocean) |
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155 | ! qfvbq i think this is wrong! |
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156 | ! ---> Array used to store energy in case of total lateral ablation |
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157 | ! qfvbq latent heat uptake/release after accretion/ablation |
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158 | ! qdtcn Energy from the turbulent oceanic heat flux heat flux coming in the lead |
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159 | |
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160 | IF ( num_sal .EQ. 2 ) zfcm2(ji,jj) = zfcm2(ji,jj) + & |
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161 | fhbri(ji,jj) ! new contribution due to brine drainage |
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162 | |
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163 | ! bottom radiative component is sent to the computation of the |
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164 | ! oceanic heat flux |
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165 | fsbbq(ji,jj) = ( 1.0 - ( ifvt + iflt ) ) * fscmbq(ji,jj) |
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166 | |
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167 | ! used to compute the oceanic heat flux at the next time step |
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168 | fsolar (ji,jj) = zfcm1(ji,jj) ! solar heat flux |
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169 | fnsolar(ji,jj) = zfcm2(ji,jj) - fdtcn(ji,jj) ! non solar heat flux |
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170 | ! ! fdtcn : turbulent oceanic heat flux |
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171 | |
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172 | |
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173 | IF ( ( ji .EQ. jiindex ) .AND. ( jj .EQ. jjindex) ) THEN |
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174 | WRITE(numout,*) ' lim_flx : heat fluxes ' |
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175 | WRITE(numout,*) ' fsolar : ', fsolar(jiindex,jjindex) |
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176 | WRITE(numout,*) ' zfcm1 : ', zfcm1(jiindex,jjindex) |
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177 | WRITE(numout,*) ' pfrld : ', pfrld(jiindex,jjindex) |
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178 | WRITE(numout,*) ' qsr_oce : ', qsr_oce(jiindex,jjindex) |
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179 | WRITE(numout,*) ' fstric : ', fstric (jiindex,jjindex) |
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180 | WRITE(numout,*) |
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181 | WRITE(numout,*) ' fnsolar : ', fnsolar(jiindex,jjindex) |
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182 | WRITE(numout,*) ' zfcm2 : ', zfcm2(jiindex,jjindex) |
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183 | WRITE(numout,*) ' zfcm1 : ', zfcm1(jiindex,jjindex) |
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184 | WRITE(numout,*) ' ifral : ', ifral |
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185 | WRITE(numout,*) ' ial : ', ial |
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186 | WRITE(numout,*) ' qcmif : ', qcmif(jiindex,jjindex) |
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187 | WRITE(numout,*) ' qldif : ', qldif(jiindex,jjindex) |
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188 | WRITE(numout,*) ' qcmif / dt: ', qcmif(jiindex,jjindex) / rdt_ice |
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189 | WRITE(numout,*) ' qldif / dt: ', qldif(jiindex,jjindex) / rdt_ice |
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190 | WRITE(numout,*) ' ifrdv : ', ifrdv |
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191 | WRITE(numout,*) ' qfvbq : ', qfvbq(jiindex,jjindex) |
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192 | WRITE(numout,*) ' qdtcn : ', qdtcn(jiindex,jjindex) |
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193 | WRITE(numout,*) ' qfvbq / dt: ', qfvbq(jiindex,jjindex) / rdt_ice |
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194 | WRITE(numout,*) ' qdtcn / dt: ', qdtcn(jiindex,jjindex) / rdt_ice |
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195 | WRITE(numout,*) ' ' |
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196 | WRITE(numout,*) ' fdtcn : ', fdtcn(jiindex,jjindex) |
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197 | WRITE(numout,*) ' fhmec : ', fhmec(jiindex,jjindex) |
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198 | WRITE(numout,*) ' fheat_rpo : ', fheat_rpo(jiindex,jjindex) |
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199 | WRITE(numout,*) ' fhbri : ', fhbri(jiindex,jjindex) |
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200 | WRITE(numout,*) ' fheat_res : ', fheat_res(jiindex,jjindex) |
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201 | ENDIF |
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202 | END DO |
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203 | END DO |
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204 | |
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205 | ! mass flux at the ocean surface |
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206 | !------------------------------------------------------- |
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207 | ! DO jl = 1, jpl |
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208 | ! DO jj = 1, jpj |
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209 | ! DO ji = 1, jpi |
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210 | ! ! this is probably wrong since rdmicif has already been computed |
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211 | ! rdmicif(ji,jj) = rdmicif(ji,jj) + rhoic*d_v_i_thd(ji,jj,jl) |
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212 | ! END DO |
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213 | ! END DO |
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214 | ! END DO |
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215 | |
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216 | DO jj = 1, jpj |
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217 | DO ji = 1, jpi |
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218 | #if defined key_lim_fdd |
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219 | ! case of realistic freshwater flux (Tartinville et al., 2001) (presently ACTIVATED) |
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220 | ! ------------------------------------------------------------------------------------- |
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221 | ! The idea of this approach is that the system that we consider is the ICE-OCEAN system |
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222 | ! Thus FW flux = External ( E-P+snow melt) |
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223 | ! Salt flux = Exchanges in the ice-ocean system then converted into FW |
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224 | ! Associated to Ice formation AND Ice melting |
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225 | ! Even if i see Ice melting as a FW and SALT flux |
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226 | ! |
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227 | |
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228 | ! computing freshwater exchanges at the ice/ocean interface |
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229 | zpme = - evap(ji,jj) * ( 1.0 - at_i(ji,jj) ) & ! evaporation over oceanic fraction |
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230 | & + tprecip(ji,jj) & ! total precipitation |
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231 | ! old fashioned way |
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232 | ! & - sprecip(ji,jj) * ( 1. - pfrld(ji,jj) ) & ! remov. snow precip over ice |
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233 | & - sprecip(ji,jj) * ( 1. - (pfrld(ji,jj)**betas) ) & ! remov. snow precip over ice |
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234 | & - rdmsnif(ji,jj) / rdt_ice & ! freshwaterflux due to snow melting |
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235 | ! new contribution from snow falling when ridging |
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236 | & + fmmec(ji,jj) |
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237 | |
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238 | ! computing salt exchanges at the ice/ocean interface |
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239 | ! sice should be the same as computed with the ice model |
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240 | zfons = ( soce - sice ) * ( rdmicif(ji,jj) / rdt_ice ) |
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241 | ! SOCE |
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242 | zfons = ( sss_io(ji,jj) - sice ) * ( rdmicif(ji,jj) / rdt_ice ) |
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243 | |
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244 | ! salt flux for constant salinity |
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245 | fsalt(ji,jj) = zfons / ( sss_io(ji,jj) + epsi16 ) + fsalt_res(ji,jj) |
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246 | zfold = fsalt(ji,jj) |
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247 | |
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248 | ! salt flux for variable salinity |
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249 | zinda = 1.0 - MAX( rzero , SIGN( rone , - ( 1.0 - pfrld(ji,jj) ) ) ) |
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250 | !correcting brine and salt fluxes |
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251 | fsbri(ji,jj) = zinda*fsbri(ji,jj) |
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252 | ! converting the salt fluxes from ice to a freshwater flux from ocean |
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253 | fsalt_res(ji,jj) = fsalt_res(ji,jj) / ( sss_io(ji,jj) + epsi16 ) |
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254 | fseqv(ji,jj) = fseqv(ji,jj) / ( sss_io(ji,jj) + epsi16 ) |
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255 | fsbri(ji,jj) = fsbri(ji,jj) / ( sss_io(ji,jj) + epsi16 ) |
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256 | fsalt_rpo(ji,jj) = fsalt_rpo(ji,jj) / ( sss_io(ji,jj) + epsi16 ) |
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257 | |
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258 | ! freshwater mass exchange (positive to the ice, negative for the ocean ?) |
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259 | ! actually it's a salt flux (so it's minus freshwater flux) |
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260 | ! if sea ice grows, zfons is positive, fsalt also |
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261 | ! POSITIVE SALT FLUX FROM THE ICE TO THE OCEAN |
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262 | ! POSITIVE FRESHWATER FLUX FROM THE OCEAN TO THE ICE [kg.m-2.s-1] |
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263 | |
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264 | fmass(ji,jj) = - zpme |
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265 | |
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266 | #else |
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267 | !+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
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268 | ! ON S'EN TAPE hhhhhhaaaaaaaaaaaaaaaaaahahahahahahahahahahahaha |
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269 | !+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
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270 | ! case of freshwater flux equivalent as salt flux |
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271 | ! dilution effect due to evaporation and precipitation |
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272 | zprs = ( tprecip(ji,jj) - sprecip(ji,jj) * ( 1. - pfrld(ji,jj) ) ) * soce |
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273 | !SOCE |
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274 | zprs = ( tprecip(ji,jj) - sprecip(ji,jj) * ( 1. - pfrld(ji,jj) ) ) * sss_io(ji,jj) |
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275 | ! freshwater flux |
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276 | zfons = rdmicif(ji,jj) * ( soce - sice ) & ! fwf : ice formation and melting |
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277 | & - dmgwi(ji,jj) * sice & ! fwf : salt flx needed to bring the fresh snow to sea/ice salinity |
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278 | & + rdmsnif(ji,jj) * soce ! fwf to ocean due to snow melting |
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279 | !SOCE |
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280 | zfons = rdmicif(ji,jj) * ( sss_io(ji,jj) - sice ) & ! fwf : ice formation and melting |
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281 | & - dmgwi(ji,jj) * sice & ! fwf : salt flx needed to bring the fresh snow to sea/ice salinity |
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282 | & + rdmsnif(ji,jj) * sss_io(ji,jj) ! fwf to ocean due to snow melting |
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283 | ! salt exchanges at the ice/ocean interface |
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284 | zpmess = zprs - zfons / rdt_ice - evap(ji,jj) * soce * ( 1.0 - at_i(ji,jj) ) |
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285 | !SOCE |
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286 | zpmess = zprs - zfons / rdt_ice - evap(ji,jj) * sss_io(ji,jj) * ( 1.0 - at_i(ji,jj) ) |
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287 | |
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288 | fsalt(ji,jj) = - zpmess |
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289 | #endif |
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290 | !+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
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291 | |
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292 | END DO |
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293 | END DO |
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294 | |
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295 | fsalt(:,:) = fseqv(:,:) + fsalt_res(:,:) + fsalt_rpo(:,:) |
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296 | IF (num_sal.eq.2) THEN |
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297 | !In case of variable salinity the salt flux has to be accounted for differently |
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298 | ! Brine drainage has to be added |
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299 | fsalt(:,:) = fsbri(:,:) + fseqv(:,:) + fsalt_res(:,:) + fsalt_rpo(:,:) |
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300 | ENDIF |
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301 | |
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302 | !-------------------------------------------------------------------! |
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303 | ! computation of others transmitting variables from ice to ocean ! |
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304 | !------------------------------------------ ------------------------! |
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305 | |
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306 | !-----------------------------------------------! |
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307 | ! Storing the transmitted variables ! |
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308 | !-----------------------------------------------! |
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309 | |
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310 | ftaux (:,:) = - tio_u(:,:) * rau0 ! taux ( ice: N/m2/rau0, ocean: N/m2 ) |
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311 | ftauy (:,:) = - tio_v(:,:) * rau0 ! tauy ( ice: N/m2/rau0, ocean: N/m2 ) |
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312 | freeze(:,:) = at_i(:,:) ! Sea ice cover |
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313 | tn_ice(:,:,:) = t_su(:,:,:) |
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314 | |
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315 | #if defined key_coupled |
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316 | zalb (:,:) = 0.e0 |
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317 | zalcn (:,:) = 0.e0 |
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318 | zalbp (:,:) = 0.e0 |
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319 | zaldum(:,:) = 0.e0 |
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320 | |
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321 | !------------------------------------------------! |
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322 | ! 2) Computation of snow/ice and ocean albedo ! |
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323 | !------------------------------------------------! |
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324 | CALL flx_blk_albedo( zalb, zalcn, zalbp, zaldum ) |
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325 | |
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326 | alb_ice(:,:) = 0.5 * zalbp(:,:) + 0.5 * zalb (:,:) ! Ice albedo |
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327 | #endif |
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328 | |
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329 | IF(ln_ctl) THEN |
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330 | CALL prt_ctl(tab2d_1=fsolar, clinfo1=' lim_flx: fsolar : ', tab2d_2=fnsolar, clinfo2=' fnsolar : ') |
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331 | CALL prt_ctl(tab2d_1=fmass , clinfo1=' lim_flx: fmass : ', tab2d_2=fsalt , clinfo2=' fsalt : ') |
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332 | CALL prt_ctl(tab2d_1=ftaux , clinfo1=' lim_flx: ftaux : ', tab2d_2=ftauy , clinfo2=' ftauy : ') |
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333 | CALL prt_ctl(tab2d_1=freeze, clinfo1=' lim_flx: freeze : ') |
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334 | CALL prt_ctl(tab3d_1=tn_ice, clinfo1=' lim_flx: tn_ice : ', kdim=jpl) |
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335 | ENDIF |
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336 | |
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337 | END SUBROUTINE lim_flx |
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338 | |
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339 | #else |
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340 | !!---------------------------------------------------------------------- |
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341 | !! Default option : Empty module NO LIM sea-ice model |
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342 | !!---------------------------------------------------------------------- |
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343 | CONTAINS |
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344 | SUBROUTINE lim_flx ! Empty routine |
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345 | END SUBROUTINE lim_flx |
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346 | #endif |
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347 | |
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348 | END MODULE limflx |
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