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_ice_lim |
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7 | !!---------------------------------------------------------------------- |
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8 | !! 'key_ice_lim' LIM 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 phycst |
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13 | USE ocfzpt |
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14 | USE ice_oce |
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15 | USE flx_oce |
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16 | USE ice |
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17 | USE flxblk |
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18 | USE lbclnk |
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19 | USE in_out_manager |
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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 lim_flx ! called by lim_step |
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26 | |
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27 | !! * Module variables |
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28 | REAL(wp) :: & ! constant values |
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29 | epsi16 = 1e-16 , & |
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30 | rzero = 0.0 , & |
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31 | rone = 1.0 |
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32 | !! * Substitutions |
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33 | # include "vectopt_loop_substitute.h90" |
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34 | !!---------------------------------------------------------------------- |
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35 | !! LIM 2.0 , UCL-LODYC-IPSL (2003) |
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36 | !!---------------------------------------------------------------------- |
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37 | CONTAINS |
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38 | |
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39 | SUBROUTINE lim_flx |
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40 | !!------------------------------------------------------------------- |
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41 | !! *** ROUTINE lim_flx *** |
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42 | !! |
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43 | !! |
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44 | !! ** Purpose : Computes the mass and heat fluxes to the ocean |
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45 | !! |
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46 | !! ** Action : - Initialisation of some variables |
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47 | !! - comput. of the fluxes at the sea ice/ocean interface |
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48 | !! |
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49 | !! ** Outputs : - fsolar : solar heat flux at sea ice/ocean interface |
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50 | !! - fnsolar : non solar heat flux |
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51 | !! - fsalt : salt flux at sea ice/ocean interface |
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52 | !! - fmass : freshwater flux at sea ice/ocean interface |
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53 | !! |
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54 | !! |
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55 | !! ** References : |
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56 | !! H. Goosse et al. 1996, Bul. Soc. Roy. Sc. Liege, 65, 87-90 |
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57 | !! original : 00-01 (LIM) |
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58 | !! addition : 02-07 (C. Ethe, G. Madec) |
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59 | !!--------------------------------------------------------------------- |
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60 | !! * Modules used |
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61 | !! * Local variables |
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62 | INTEGER :: ji, jj ! dummy loop indices |
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63 | |
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64 | INTEGER :: & |
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65 | ifvt, i1mfr, idfr , & ! some switches |
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66 | iflt, ial, iadv, ifral, ifrdv |
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67 | |
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68 | REAL(wp) :: & |
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69 | zinda , & ! switch for testing the values of ice concentration |
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70 | z1mthcm, & ! 1 - thcm |
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71 | !! zfcm1 , & ! solar heat fluxes |
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72 | !! zfcm2 , & ! non solar heat fluxes |
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73 | #if defined key_lim_fdd |
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74 | zfons, & ! salt exchanges at the ice/ocean interface |
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75 | zpme ! freshwater exchanges at the ice/ocean interface |
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76 | #else |
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77 | zprs , zfons, & ! salt exchanges at the ice/ocean interface |
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78 | zpmess ! freshwater exchanges at the ice/ocean interface |
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79 | #endif |
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80 | REAL(wp), DIMENSION(jpi,jpj) :: & |
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81 | zfcm1 , & ! solar heat fluxes |
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82 | zfcm2 ! non solar heat fluxes |
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83 | #if defined key_coupled |
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84 | REAL(wp), DIMENSION(jpi,jpj) :: & |
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85 | zalb , & ! albedo of ice under overcast sky |
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86 | zalcn , & ! albedo of ocean under overcast sky |
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87 | zalbp , & ! albedo of ice under clear sky |
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88 | zaldum ! albedo of ocean under clear sky |
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89 | #endif |
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90 | !!--------------------------------------------------------------------- |
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91 | |
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92 | !---------------------------------! |
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93 | ! Sea ice/ocean interface ! |
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94 | !---------------------------------! |
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95 | |
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96 | |
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97 | ! heat flux at the ocean surface |
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98 | !------------------------------------------------------- |
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99 | |
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100 | DO jj = 1, jpj |
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101 | DO ji = 1, jpi |
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102 | zinda = 1.0 - MAX( rzero , SIGN( rone , - ( 1.0 - pfrld(ji,jj) ) ) ) |
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103 | ifvt = zinda * MAX( rzero , SIGN( rone, -phicif(ji,jj) ) ) |
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104 | i1mfr = 1.0 - MAX( rzero , SIGN( rone , - ( 1.0 - frld(ji,jj) ) ) ) |
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105 | idfr = 1.0 - MAX( rzero , SIGN( rone , frld(ji,jj) - pfrld(ji,jj) ) ) |
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106 | iflt = zinda * (1 - i1mfr) * (1 - ifvt ) |
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107 | ial = ifvt * i1mfr + ( 1 - ifvt ) * idfr |
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108 | iadv = ( 1 - i1mfr ) * zinda |
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109 | ifral = ( 1 - i1mfr * ( 1 - ial ) ) |
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110 | ifrdv = ( 1 - ifral * ( 1 - ial ) ) * iadv |
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111 | z1mthcm = 1. - thcm(ji,jj) |
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112 | ! computation the solar flux at ocean surface |
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113 | zfcm1(ji,jj) = pfrld(ji,jj) * qsr_oce(ji,jj) + ( 1. - pfrld(ji,jj) ) * fstric(ji,jj) |
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114 | ! computation the non solar heat flux at ocean surface |
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115 | zfcm2(ji,jj) = - z1mthcm * zfcm1(ji,jj) & |
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116 | & + iflt * ( fscmbq(ji,jj) + ffltbif(ji,jj) ) & |
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117 | & + ifral * ( ial * qcmif(ji,jj) + (1 - ial) * qldif(ji,jj) ) / rdt_ice & |
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118 | & + ifrdv * ( qfvbq(ji,jj) + qdtcn(ji,jj) ) / rdt_ice |
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119 | |
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120 | fsbbq(ji,jj) = ( 1.0 - ( ifvt + iflt ) ) * fscmbq(ji,jj) ! ??? |
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121 | |
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122 | fsolar (ji,jj) = zfcm1(ji,jj) ! solar heat flux |
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123 | |
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124 | fnsolar(ji,jj) = zfcm2(ji,jj) - fdtcn(ji,jj) ! non solar heat flux |
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125 | END DO |
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126 | END DO |
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127 | |
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128 | |
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129 | ! mass flux at the ocean surface |
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130 | !------------------------------------------------------- |
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131 | |
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132 | DO jj = 1, jpj |
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133 | DO ji = 1, jpi |
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134 | #if defined key_lim_fdd |
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135 | ! case of realistic freshwater flux (Tartinville et al., 2001) |
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136 | |
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137 | ! computing freshwater exchanges at the ice/ocean interface |
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138 | zpme = - evap(ji,jj) * frld(ji,jj) & ! evaporation over oceanic fraction |
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139 | & + tprecip(ji,jj) & ! total precipitation |
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140 | & - sprecip(ji,jj) * ( 1. - pfrld(ji,jj) ) & ! remov. snow precip over ice |
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141 | & - rdmsnif(ji,jj) / rdt_ice ! freshwaterflux due to snow melting |
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142 | |
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143 | ! computing salt exchanges at the ice/ocean interface |
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144 | zfons = ( soce - sice ) * ( rdmicif(ji,jj) / rdt_ice ) |
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145 | |
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146 | ! converting the salt flux from ice to a freshwater flux from ocean |
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147 | fsalt(ji,jj) = zfons / ( sss_io(ji,jj) + epsi16 ) |
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148 | |
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149 | ! freshwater masses |
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150 | fmass(ji,jj) = - zpme |
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151 | #else |
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152 | ! case of freshwater flux equivalent as salt flux |
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153 | ! dilution effect due to evaporation and precipitation |
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154 | zprs = ( tprecip(ji,jj) - sprecip(ji,jj) * ( 1. - pfrld(ji,jj) ) ) * soce |
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155 | ! freshwater flux |
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156 | zfons = rdmicif(ji,jj) * ( soce - sice ) & ! fwf : ice formation and melting |
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157 | & - dmgwi(ji,jj) * sice & ! fwf : salt flx needed to bring the fresh snow to sea/ice salinity |
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158 | & + rdmsnif(ji,jj) * soce ! fwf to ocean due to snow melting |
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159 | ! salt exchanges at the ice/ocean interface |
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160 | zpmess = zprs - zfons / rdt_ice - evap(ji,jj) * soce * frld(ji,jj) |
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161 | fsalt(ji,jj) = - zpmess |
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162 | #endif |
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163 | END DO |
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164 | END DO |
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165 | |
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166 | |
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167 | !-------------------------------------------------------------------! |
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168 | ! computation of others transmitting variables from ice to ocean ! |
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169 | !------------------------------------------ ------------------------! |
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170 | |
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171 | !-----------------------------------------------! |
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172 | ! Storing the transmitted variables ! |
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173 | !-----------------------------------------------! |
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174 | |
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175 | DO jj = 1, jpj |
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176 | DO ji = 1, jpi |
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177 | ftaux (ji,jj) = - tio_u(ji,jj) * rau0 ! taux ( ice: N/m2/rau0, ocean: N/m2 ) |
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178 | ftauy (ji,jj) = - tio_v(ji,jj) * rau0 ! tauy ( ice: N/m2/rau0, ocean: N/m2 ) |
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179 | freeze(ji,jj) = 1.0 - frld(ji,jj) ! Sea ice cover |
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180 | tn_ice(ji,jj) = sist(ji,jj) ! Ice surface temperature |
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181 | END DO |
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182 | END DO |
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183 | |
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184 | #if defined key_coupled |
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185 | zalb (:,:) = 0.e0 |
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186 | zalcn (:,:) = 0.e0 |
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187 | zalbp (:,:) = 0.e0 |
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188 | zaldum(:,:) = 0.e0 |
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189 | |
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190 | !------------------------------------------------! |
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191 | ! 2) Computation of snow/ice and ocean albedo ! |
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192 | !------------------------------------------------! |
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193 | CALL flx_blk_albedo( zalb, zalcn, zalbp, zaldum ) |
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194 | |
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195 | DO jj = 1, jpj |
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196 | DO ji = 1, jpi |
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197 | alb_ice(ji,jj) = 0.5 * zalbp(ji,jj) + 0.5 * zalb (ji,jj) ! Ice albedo |
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198 | END DO |
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199 | END DO |
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200 | #endif |
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201 | |
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202 | IF( l_ctl .AND. lwp ) THEN |
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203 | WRITE(numout,*) ' lim_flx ' |
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204 | WRITE(numout,*) ' fsolar ', SUM(fsolar), ' fnsolar', SUM( fnsolar ) |
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205 | WRITE(numout,*) ' fmass ', SUM(fmass ), ' fsalt ', SUM(fsalt) |
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206 | WRITE(numout,*) ' ftaux ', SUM(ftaux ), ' ftauy ', SUM(ftauy) |
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207 | WRITE(numout,*) ' freeze ', SUM(freeze), ' tn_ice ', SUM(tn_ice) |
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208 | ENDIF |
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209 | |
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210 | |
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211 | END SUBROUTINE lim_flx |
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212 | |
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213 | #else |
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214 | !!---------------------------------------------------------------------- |
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215 | !! Default option : Empty module NO LIM sea-ice model |
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216 | !!---------------------------------------------------------------------- |
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217 | CONTAINS |
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218 | SUBROUTINE lim_flx ! Empty routine |
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219 | END SUBROUTINE lim_flx |
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220 | #endif |
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221 | |
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222 | END MODULE limflx |
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