1 | MODULE limvar |
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2 | !!====================================================================== |
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3 | !! *** MODULE limvar *** |
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4 | !! Different sets of ice model variables |
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5 | !! how to switch from one to another |
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6 | !! |
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7 | !! There are three sets of variables |
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8 | !! VGLO : global variables of the model |
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9 | !! - v_i (jpi,jpj,jpl) |
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10 | !! - v_s (jpi,jpj,jpl) |
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11 | !! - a_i (jpi,jpj,jpl) |
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12 | !! - t_s (jpi,jpj,jpl) |
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13 | !! - e_i (jpi,jpj,nlay_i,jpl) |
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14 | !! - smv_i(jpi,jpj,jpl) |
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15 | !! - oa_i (jpi,jpj,jpl) |
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16 | !! VEQV : equivalent variables sometimes used in the model |
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17 | !! - ht_i(jpi,jpj,jpl) |
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18 | !! - ht_s(jpi,jpj,jpl) |
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19 | !! - t_i (jpi,jpj,nlay_i,jpl) |
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20 | !! ... |
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21 | !! VAGG : aggregate variables, averaged/summed over all |
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22 | !! thickness categories |
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23 | !! - vt_i(jpi,jpj) |
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24 | !! - vt_s(jpi,jpj) |
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25 | !! - at_i(jpi,jpj) |
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26 | !! - et_s(jpi,jpj) !total snow heat content |
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27 | !! - et_i(jpi,jpj) !total ice thermal content |
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28 | !! - smt_i(jpi,jpj) !mean ice salinity |
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29 | !! - ot_i(jpi,jpj) !average ice age |
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30 | !!====================================================================== |
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31 | !! History : - ! 2006-01 (M. Vancoppenolle) Original code |
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32 | !! 3.4 ! 2011-02 (G. Madec) dynamical allocation |
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33 | !!---------------------------------------------------------------------- |
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34 | #if defined key_lim3 |
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35 | !!---------------------------------------------------------------------- |
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36 | !! 'key_lim3' LIM3 sea-ice model |
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37 | !!---------------------------------------------------------------------- |
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38 | USE par_oce ! ocean parameters |
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39 | USE phycst ! physical constants (ocean directory) |
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40 | USE sbc_oce ! Surface boundary condition: ocean fields |
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41 | USE ice ! ice variables |
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42 | USE par_ice ! ice parameters |
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43 | USE thd_ice ! ice variables (thermodynamics) |
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44 | USE dom_ice ! ice domain |
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45 | USE in_out_manager ! I/O manager |
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46 | USE lib_mpp ! MPP library |
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47 | USE wrk_nemo ! work arrays |
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48 | USE lib_fortran ! Fortran utilities (allows no signed zero when 'key_nosignedzero' defined) |
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49 | |
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50 | IMPLICIT NONE |
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51 | PRIVATE |
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52 | |
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53 | PUBLIC lim_var_agg |
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54 | PUBLIC lim_var_glo2eqv |
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55 | PUBLIC lim_var_eqv2glo |
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56 | PUBLIC lim_var_salprof |
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57 | PUBLIC lim_var_icetm |
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58 | PUBLIC lim_var_bv |
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59 | PUBLIC lim_var_salprof1d |
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60 | PUBLIC lim_var_zapsmall |
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61 | PUBLIC lim_var_itd |
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62 | |
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63 | !!---------------------------------------------------------------------- |
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64 | !! NEMO/LIM3 3.5 , UCL - NEMO Consortium (2011) |
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65 | !! $Id$ |
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66 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
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67 | !!---------------------------------------------------------------------- |
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68 | CONTAINS |
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69 | |
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70 | SUBROUTINE lim_var_agg( kn ) |
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71 | !!------------------------------------------------------------------ |
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72 | !! *** ROUTINE lim_var_agg *** |
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73 | !! |
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74 | !! ** Purpose : aggregates ice-thickness-category variables to all-ice variables |
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75 | !! i.e. it turns VGLO into VAGG |
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76 | !! ** Method : |
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77 | !! |
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78 | !! ** Arguments : n = 1, at_i vt_i only |
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79 | !! n = 2 everything |
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80 | !! |
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81 | !! note : you could add an argument when you need only at_i, vt_i |
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82 | !! and when you need everything |
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83 | !!------------------------------------------------------------------ |
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84 | INTEGER, INTENT( in ) :: kn ! =1 at_i & vt only ; = what is needed |
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85 | ! |
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86 | INTEGER :: ji, jj, jk, jl ! dummy loop indices |
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87 | !!------------------------------------------------------------------ |
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88 | |
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89 | !-------------------- |
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90 | ! Compute variables |
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91 | !-------------------- |
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92 | vt_i (:,:) = 0._wp |
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93 | vt_s (:,:) = 0._wp |
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94 | at_i (:,:) = 0._wp |
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95 | ato_i(:,:) = 1._wp |
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96 | ! |
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97 | DO jl = 1, jpl |
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98 | DO jj = 1, jpj |
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99 | DO ji = 1, jpi |
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100 | ! |
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101 | vt_i(ji,jj) = vt_i(ji,jj) + v_i(ji,jj,jl) ! ice volume |
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102 | vt_s(ji,jj) = vt_s(ji,jj) + v_s(ji,jj,jl) ! snow volume |
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103 | at_i(ji,jj) = at_i(ji,jj) + a_i(ji,jj,jl) ! ice concentration |
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104 | ! |
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105 | rswitch = MAX( 0._wp , SIGN( 1._wp , at_i(ji,jj) - epsi10 ) ) |
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106 | icethi(ji,jj) = vt_i(ji,jj) / MAX( at_i(ji,jj) , epsi10 ) * rswitch ! ice thickness |
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107 | END DO |
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108 | END DO |
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109 | END DO |
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110 | |
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111 | DO jj = 1, jpj |
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112 | DO ji = 1, jpi |
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113 | ato_i(ji,jj) = MAX( 1._wp - at_i(ji,jj), 0._wp ) ! open water fraction |
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114 | END DO |
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115 | END DO |
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116 | |
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117 | IF( kn > 1 ) THEN |
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118 | et_s (:,:) = 0._wp |
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119 | ot_i (:,:) = 0._wp |
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120 | smt_i(:,:) = 0._wp |
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121 | et_i (:,:) = 0._wp |
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122 | ! |
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123 | DO jl = 1, jpl |
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124 | DO jj = 1, jpj |
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125 | DO ji = 1, jpi |
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126 | et_s(ji,jj) = et_s(ji,jj) + e_s(ji,jj,1,jl) ! snow heat content |
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127 | rswitch = MAX( 0._wp , SIGN( 1._wp , vt_i(ji,jj) - epsi10 ) ) |
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128 | smt_i(ji,jj) = smt_i(ji,jj) + smv_i(ji,jj,jl) / MAX( vt_i(ji,jj) , epsi10 ) * rswitch ! ice salinity |
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129 | rswitch = MAX( 0._wp , SIGN( 1._wp , at_i(ji,jj) - epsi10 ) ) |
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130 | ot_i(ji,jj) = ot_i(ji,jj) + oa_i(ji,jj,jl) / MAX( at_i(ji,jj) , epsi10 ) * rswitch ! ice age |
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131 | END DO |
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132 | END DO |
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133 | END DO |
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134 | ! |
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135 | DO jl = 1, jpl |
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136 | DO jk = 1, nlay_i |
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137 | et_i(:,:) = et_i(:,:) + e_i(:,:,jk,jl) ! ice heat content |
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138 | END DO |
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139 | END DO |
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140 | ! |
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141 | ENDIF |
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142 | ! |
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143 | END SUBROUTINE lim_var_agg |
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144 | |
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145 | |
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146 | SUBROUTINE lim_var_glo2eqv |
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147 | !!------------------------------------------------------------------ |
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148 | !! *** ROUTINE lim_var_glo2eqv *** |
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149 | !! |
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150 | !! ** Purpose : computes equivalent variables as function of global variables |
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151 | !! i.e. it turns VGLO into VEQV |
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152 | !!------------------------------------------------------------------ |
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153 | INTEGER :: ji, jj, jk, jl ! dummy loop indices |
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154 | REAL(wp) :: zq_i, zaaa, zbbb, zccc, zdiscrim ! local scalars |
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155 | REAL(wp) :: ztmelts, zq_s, zfac1, zfac2 ! - - |
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156 | !!------------------------------------------------------------------ |
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157 | |
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158 | !------------------------------------------------------- |
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159 | ! Ice thickness, snow thickness, ice salinity, ice age |
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160 | !------------------------------------------------------- |
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161 | DO jl = 1, jpl |
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162 | DO jj = 1, jpj |
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163 | DO ji = 1, jpi |
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164 | rswitch = 1._wp - MAX( 0._wp , SIGN( 1._wp,- a_i(ji,jj,jl) + epsi10 ) ) !0 if no ice and 1 if yes |
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165 | ht_i(ji,jj,jl) = v_i (ji,jj,jl) / MAX( a_i(ji,jj,jl) , epsi10 ) * rswitch |
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166 | ht_s(ji,jj,jl) = v_s (ji,jj,jl) / MAX( a_i(ji,jj,jl) , epsi10 ) * rswitch |
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167 | o_i(ji,jj,jl) = oa_i(ji,jj,jl) / MAX( a_i(ji,jj,jl) , epsi10 ) * rswitch |
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168 | END DO |
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169 | END DO |
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170 | END DO |
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171 | |
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172 | IF( num_sal == 2 )THEN |
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173 | DO jl = 1, jpl |
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174 | DO jj = 1, jpj |
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175 | DO ji = 1, jpi |
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176 | rswitch = 1._wp - MAX( 0._wp , SIGN( 1._wp,- a_i(ji,jj,jl) + epsi10 ) ) !0 if no ice and 1 if yes |
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177 | sm_i(ji,jj,jl) = smv_i(ji,jj,jl) / MAX( v_i(ji,jj,jl) , epsi10 ) * rswitch |
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178 | END DO |
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179 | END DO |
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180 | END DO |
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181 | ENDIF |
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182 | |
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183 | CALL lim_var_salprof ! salinity profile |
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184 | |
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185 | !------------------- |
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186 | ! Ice temperatures |
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187 | !------------------- |
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188 | DO jl = 1, jpl |
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189 | DO jk = 1, nlay_i |
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190 | DO jj = 1, jpj |
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191 | DO ji = 1, jpi |
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192 | ! ! Energy of melting q(S,T) [J.m-3] |
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193 | rswitch = 1.0 - MAX( 0.0 , SIGN( 1.0 , - v_i(ji,jj,jl) + epsi10 ) ) ! rswitch = 0 if no ice and 1 if yes |
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194 | zq_i = rswitch * e_i(ji,jj,jk,jl) / area(ji,jj) / MAX( v_i(ji,jj,jl) , epsi10 ) * REAL(nlay_i,wp) |
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195 | zq_i = zq_i * unit_fac ! convert units |
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196 | ztmelts = -tmut * s_i(ji,jj,jk,jl) + rtt ! Ice layer melt temperature |
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197 | ! |
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198 | zaaa = cpic ! Conversion q(S,T) -> T (second order equation) |
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199 | zbbb = ( rcp - cpic ) * ( ztmelts - rtt ) + zq_i / rhoic - lfus |
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200 | zccc = lfus * (ztmelts-rtt) |
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201 | zdiscrim = SQRT( MAX(zbbb*zbbb - 4._wp*zaaa*zccc , 0._wp) ) |
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202 | t_i(ji,jj,jk,jl) = rtt + rswitch *( - zbbb - zdiscrim ) / ( 2.0 *zaaa ) |
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203 | t_i(ji,jj,jk,jl) = MIN( rtt, MAX( 173.15_wp, t_i(ji,jj,jk,jl) ) ) ! 100-rtt < t_i < rtt |
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204 | END DO |
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205 | END DO |
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206 | END DO |
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207 | END DO |
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208 | |
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209 | !-------------------- |
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210 | ! Snow temperatures |
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211 | !-------------------- |
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212 | zfac1 = 1._wp / ( rhosn * cpic ) |
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213 | zfac2 = lfus / cpic |
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214 | DO jl = 1, jpl |
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215 | DO jk = 1, nlay_s |
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216 | DO jj = 1, jpj |
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217 | DO ji = 1, jpi |
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218 | !Energy of melting q(S,T) [J.m-3] |
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219 | rswitch = 1._wp - MAX( 0._wp , SIGN( 1._wp , - v_s(ji,jj,jl) + epsi10 ) ) ! rswitch = 0 if no ice and 1 if yes |
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220 | zq_s = rswitch * e_s(ji,jj,jk,jl) / ( area(ji,jj) * MAX( v_s(ji,jj,jl) , epsi10 ) ) * REAL(nlay_s,wp) |
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221 | zq_s = zq_s * unit_fac ! convert units |
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222 | ! |
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223 | t_s(ji,jj,jk,jl) = rtt + rswitch * ( - zfac1 * zq_s + zfac2 ) |
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224 | t_s(ji,jj,jk,jl) = MIN( rtt, MAX( 173.15, t_s(ji,jj,jk,jl) ) ) ! 100-rtt < t_i < rtt |
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225 | END DO |
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226 | END DO |
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227 | END DO |
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228 | END DO |
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229 | |
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230 | !------------------- |
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231 | ! Mean temperature |
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232 | !------------------- |
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233 | tm_i(:,:) = 0._wp |
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234 | DO jl = 1, jpl |
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235 | DO jk = 1, nlay_i |
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236 | DO jj = 1, jpj |
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237 | DO ji = 1, jpi |
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238 | rswitch = ( 1._wp - MAX( 0._wp , SIGN( 1._wp , - vt_i(ji,jj) + epsi10 ) ) ) |
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239 | tm_i(ji,jj) = tm_i(ji,jj) + rswitch * t_i(ji,jj,jk,jl) * v_i(ji,jj,jl) & |
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240 | & / ( REAL(nlay_i,wp) * MAX( vt_i(ji,jj) , epsi10 ) ) |
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241 | END DO |
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242 | END DO |
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243 | END DO |
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244 | END DO |
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245 | ! |
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246 | END SUBROUTINE lim_var_glo2eqv |
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247 | |
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248 | |
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249 | SUBROUTINE lim_var_eqv2glo |
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250 | !!------------------------------------------------------------------ |
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251 | !! *** ROUTINE lim_var_eqv2glo *** |
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252 | !! |
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253 | !! ** Purpose : computes global variables as function of equivalent variables |
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254 | !! i.e. it turns VEQV into VGLO |
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255 | !! ** Method : |
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256 | !! |
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257 | !! ** History : (01-2006) Martin Vancoppenolle, UCL-ASTR |
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258 | !!------------------------------------------------------------------ |
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259 | ! |
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260 | v_i(:,:,:) = ht_i(:,:,:) * a_i(:,:,:) |
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261 | v_s(:,:,:) = ht_s(:,:,:) * a_i(:,:,:) |
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262 | smv_i(:,:,:) = sm_i(:,:,:) * v_i(:,:,:) |
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263 | oa_i (:,:,:) = o_i (:,:,:) * a_i(:,:,:) |
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264 | ! |
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265 | END SUBROUTINE lim_var_eqv2glo |
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266 | |
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267 | |
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268 | SUBROUTINE lim_var_salprof |
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269 | !!------------------------------------------------------------------ |
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270 | !! *** ROUTINE lim_var_salprof *** |
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271 | !! |
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272 | !! ** Purpose : computes salinity profile in function of bulk salinity |
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273 | !! |
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274 | !! ** Method : If bulk salinity greater than zsi1, |
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275 | !! the profile is assumed to be constant (S_inf) |
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276 | !! If bulk salinity lower than zsi0, |
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277 | !! the profile is linear with 0 at the surface (S_zero) |
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278 | !! If it is between zsi0 and zsi1, it is a |
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279 | !! alpha-weighted linear combination of s_inf and s_zero |
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280 | !! |
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281 | !! ** References : Vancoppenolle et al., 2007 |
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282 | !!------------------------------------------------------------------ |
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283 | INTEGER :: ji, jj, jk, jl ! dummy loop index |
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284 | REAL(wp) :: dummy_fac0, dummy_fac1, dummy_fac, zsal |
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285 | REAL(wp) :: zswi0, zswi01, zswibal, zargtemp , zs_zero |
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286 | REAL(wp), POINTER, DIMENSION(:,:,:) :: z_slope_s, zalpha |
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287 | REAL(wp), PARAMETER :: zsi0 = 3.5_wp |
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288 | REAL(wp), PARAMETER :: zsi1 = 4.5_wp |
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289 | !!------------------------------------------------------------------ |
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290 | |
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291 | CALL wrk_alloc( jpi, jpj, jpl, z_slope_s, zalpha ) |
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292 | |
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293 | !--------------------------------------- |
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294 | ! Vertically constant, constant in time |
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295 | !--------------------------------------- |
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296 | IF( num_sal == 1 ) s_i(:,:,:,:) = bulk_sal |
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297 | |
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298 | !----------------------------------- |
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299 | ! Salinity profile, varying in time |
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300 | !----------------------------------- |
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301 | IF( num_sal == 2 ) THEN |
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302 | ! |
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303 | DO jk = 1, nlay_i |
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304 | s_i(:,:,jk,:) = sm_i(:,:,:) |
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305 | END DO |
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306 | ! |
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307 | DO jl = 1, jpl ! Slope of the linear profile |
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308 | DO jj = 1, jpj |
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309 | DO ji = 1, jpi |
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310 | z_slope_s(ji,jj,jl) = 2._wp * sm_i(ji,jj,jl) / MAX( epsi10 , ht_i(ji,jj,jl) ) |
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311 | END DO |
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312 | END DO |
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313 | END DO |
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314 | ! |
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315 | dummy_fac0 = 1._wp / ( zsi0 - zsi1 ) ! Weighting factor between zs_zero and zs_inf |
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316 | dummy_fac1 = zsi1 / ( zsi1 - zsi0 ) |
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317 | ! |
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318 | zalpha(:,:,:) = 0._wp |
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319 | DO jl = 1, jpl |
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320 | DO jj = 1, jpj |
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321 | DO ji = 1, jpi |
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322 | ! zswi0 = 1 if sm_i le zsi0 and 0 otherwise |
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323 | zswi0 = MAX( 0._wp , SIGN( 1._wp , zsi0 - sm_i(ji,jj,jl) ) ) |
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324 | ! zswi01 = 1 if sm_i is between zsi0 and zsi1 and 0 othws |
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325 | zswi01 = ( 1._wp - zswi0 ) * MAX( 0._wp , SIGN( 1._wp , zsi1 - sm_i(ji,jj,jl) ) ) |
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326 | ! If 2.sm_i GE sss_m then zswibal = 1 |
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327 | ! this is to force a constant salinity profile in the Baltic Sea |
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328 | zswibal = MAX( 0._wp , SIGN( 1._wp , 2._wp * sm_i(ji,jj,jl) - sss_m(ji,jj) ) ) |
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329 | zalpha(ji,jj,jl) = zswi0 + zswi01 * ( sm_i(ji,jj,jl) * dummy_fac0 + dummy_fac1 ) |
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330 | zalpha(ji,jj,jl) = zalpha(ji,jj,jl) * ( 1._wp - zswibal ) |
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331 | END DO |
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332 | END DO |
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333 | END DO |
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334 | |
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335 | dummy_fac = 1._wp / REAL( nlay_i ) ! Computation of the profile |
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336 | DO jl = 1, jpl |
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337 | DO jk = 1, nlay_i |
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338 | DO jj = 1, jpj |
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339 | DO ji = 1, jpi |
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340 | ! ! linear profile with 0 at the surface |
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341 | zs_zero = z_slope_s(ji,jj,jl) * ( REAL(jk,wp) - 0.5_wp ) * ht_i(ji,jj,jl) * dummy_fac |
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342 | ! ! weighting the profile |
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343 | s_i(ji,jj,jk,jl) = zalpha(ji,jj,jl) * zs_zero + ( 1._wp - zalpha(ji,jj,jl) ) * sm_i(ji,jj,jl) |
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344 | END DO ! ji |
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345 | END DO ! jj |
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346 | END DO ! jk |
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347 | END DO ! jl |
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348 | ! |
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349 | ENDIF ! num_sal |
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350 | |
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351 | !------------------------------------------------------- |
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352 | ! Vertically varying salinity profile, constant in time |
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353 | !------------------------------------------------------- |
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354 | |
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355 | IF( num_sal == 3 ) THEN ! Schwarzacher (1959) multiyear salinity profile (mean = 2.30) |
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356 | ! |
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357 | sm_i(:,:,:) = 2.30_wp |
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358 | ! |
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359 | DO jl = 1, jpl |
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360 | DO jk = 1, nlay_i |
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361 | zargtemp = ( REAL(jk,wp) - 0.5_wp ) / REAL(nlay_i,wp) |
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362 | zsal = 1.6_wp * ( 1._wp - COS( rpi * zargtemp**(0.407_wp/(0.573_wp+zargtemp)) ) ) |
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363 | s_i(:,:,jk,jl) = zsal |
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364 | END DO |
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365 | END DO |
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366 | ! |
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367 | ENDIF ! num_sal |
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368 | ! |
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369 | CALL wrk_dealloc( jpi, jpj, jpl, z_slope_s, zalpha ) |
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370 | ! |
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371 | END SUBROUTINE lim_var_salprof |
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372 | |
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373 | |
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374 | SUBROUTINE lim_var_icetm |
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375 | !!------------------------------------------------------------------ |
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376 | !! *** ROUTINE lim_var_icetm *** |
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377 | !! |
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378 | !! ** Purpose : computes mean sea ice temperature |
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379 | !!------------------------------------------------------------------ |
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380 | INTEGER :: ji, jj, jk, jl ! dummy loop indices |
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381 | !!------------------------------------------------------------------ |
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382 | |
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383 | ! Mean sea ice temperature |
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384 | tm_i(:,:) = 0._wp |
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385 | DO jl = 1, jpl |
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386 | DO jk = 1, nlay_i |
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387 | DO jj = 1, jpj |
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388 | DO ji = 1, jpi |
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389 | rswitch = ( 1._wp - MAX( 0._wp , SIGN( 1._wp , - vt_i(ji,jj) + epsi10 ) ) ) |
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390 | tm_i(ji,jj) = tm_i(ji,jj) + rswitch * t_i(ji,jj,jk,jl) * v_i(ji,jj,jl) & |
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391 | & / ( REAL(nlay_i,wp) * MAX( vt_i(ji,jj) , epsi10 ) ) |
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392 | END DO |
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393 | END DO |
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394 | END DO |
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395 | END DO |
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396 | |
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397 | END SUBROUTINE lim_var_icetm |
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398 | |
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399 | |
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400 | SUBROUTINE lim_var_bv |
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401 | !!------------------------------------------------------------------ |
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402 | !! *** ROUTINE lim_var_bv *** |
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403 | !! |
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404 | !! ** Purpose : computes mean brine volume (%) in sea ice |
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405 | !! |
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406 | !! ** Method : e = - 0.054 * S (ppt) / T (C) |
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407 | !! |
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408 | !! References : Vancoppenolle et al., JGR, 2007 |
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409 | !!------------------------------------------------------------------ |
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410 | INTEGER :: ji, jj, jk, jl ! dummy loop indices |
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411 | REAL(wp) :: zbvi ! local scalars |
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412 | !!------------------------------------------------------------------ |
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413 | ! |
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414 | bv_i(:,:) = 0._wp |
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415 | DO jl = 1, jpl |
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416 | DO jk = 1, nlay_i |
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417 | DO jj = 1, jpj |
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418 | DO ji = 1, jpi |
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419 | rswitch = ( 1._wp - MAX( 0._wp , SIGN( 1._wp , (t_i(ji,jj,jk,jl) - rtt) + epsi10 ) ) ) |
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420 | zbvi = - rswitch * tmut * s_i(ji,jj,jk,jl) / MIN( t_i(ji,jj,jk,jl) - rtt, - epsi10 ) & |
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421 | & * v_i(ji,jj,jl) / REAL(nlay_i,wp) |
---|
422 | rswitch = ( 1._wp - MAX( 0._wp , SIGN( 1._wp , - vt_i(ji,jj) + epsi10 ) ) ) |
---|
423 | bv_i(ji,jj) = bv_i(ji,jj) + rswitch * zbvi / MAX( vt_i(ji,jj) , epsi10 ) |
---|
424 | END DO |
---|
425 | END DO |
---|
426 | END DO |
---|
427 | END DO |
---|
428 | ! |
---|
429 | END SUBROUTINE lim_var_bv |
---|
430 | |
---|
431 | |
---|
432 | SUBROUTINE lim_var_salprof1d( kideb, kiut ) |
---|
433 | !!------------------------------------------------------------------- |
---|
434 | !! *** ROUTINE lim_thd_salprof1d *** |
---|
435 | !! |
---|
436 | !! ** Purpose : 1d computation of the sea ice salinity profile |
---|
437 | !! Works with 1d vectors and is used by thermodynamic modules |
---|
438 | !!------------------------------------------------------------------- |
---|
439 | INTEGER, INTENT(in) :: kideb, kiut ! thickness category index |
---|
440 | ! |
---|
441 | INTEGER :: ji, jk ! dummy loop indices |
---|
442 | INTEGER :: ii, ij ! local integers |
---|
443 | REAL(wp) :: dummy_fac0, dummy_fac1, dummy_fac2, zargtemp, zsal ! local scalars |
---|
444 | REAL(wp) :: zalpha, zswi0, zswi01, zswibal, zs_zero ! - - |
---|
445 | ! |
---|
446 | REAL(wp), POINTER, DIMENSION(:) :: z_slope_s |
---|
447 | REAL(wp), PARAMETER :: zsi0 = 3.5_wp |
---|
448 | REAL(wp), PARAMETER :: zsi1 = 4.5_wp |
---|
449 | !!--------------------------------------------------------------------- |
---|
450 | |
---|
451 | CALL wrk_alloc( jpij, z_slope_s ) |
---|
452 | |
---|
453 | !--------------------------------------- |
---|
454 | ! Vertically constant, constant in time |
---|
455 | !--------------------------------------- |
---|
456 | IF( num_sal == 1 ) s_i_1d(:,:) = bulk_sal |
---|
457 | |
---|
458 | !------------------------------------------------------ |
---|
459 | ! Vertically varying salinity profile, varying in time |
---|
460 | !------------------------------------------------------ |
---|
461 | |
---|
462 | IF( num_sal == 2 ) THEN |
---|
463 | ! |
---|
464 | DO ji = kideb, kiut ! Slope of the linear profile zs_zero |
---|
465 | z_slope_s(ji) = 2._wp * sm_i_1d(ji) / MAX( epsi10 , ht_i_1d(ji) ) |
---|
466 | END DO |
---|
467 | |
---|
468 | ! Weighting factor between zs_zero and zs_inf |
---|
469 | !--------------------------------------------- |
---|
470 | dummy_fac0 = 1._wp / ( zsi0 - zsi1 ) |
---|
471 | dummy_fac1 = zsi1 / ( zsi1 - zsi0 ) |
---|
472 | dummy_fac2 = 1._wp / REAL(nlay_i,wp) |
---|
473 | |
---|
474 | DO jk = 1, nlay_i |
---|
475 | DO ji = kideb, kiut |
---|
476 | ii = MOD( npb(ji) - 1 , jpi ) + 1 |
---|
477 | ij = ( npb(ji) - 1 ) / jpi + 1 |
---|
478 | ! zswi0 = 1 if sm_i le zsi0 and 0 otherwise |
---|
479 | zswi0 = MAX( 0._wp , SIGN( 1._wp , zsi0 - sm_i_1d(ji) ) ) |
---|
480 | ! zswi01 = 1 if sm_i is between zsi0 and zsi1 and 0 othws |
---|
481 | zswi01 = ( 1._wp - zswi0 ) * MAX( 0._wp , SIGN( 1._wp , zsi1 - sm_i_1d(ji) ) ) |
---|
482 | ! if 2.sm_i GE sss_m then zswibal = 1 |
---|
483 | ! this is to force a constant salinity profile in the Baltic Sea |
---|
484 | zswibal = MAX( 0._wp , SIGN( 1._wp , 2._wp * sm_i_1d(ji) - sss_m(ii,ij) ) ) |
---|
485 | ! |
---|
486 | zalpha = ( zswi0 + zswi01 * ( sm_i_1d(ji) * dummy_fac0 + dummy_fac1 ) ) * ( 1.0 - zswibal ) |
---|
487 | ! |
---|
488 | zs_zero = z_slope_s(ji) * ( REAL(jk,wp) - 0.5_wp ) * ht_i_1d(ji) * dummy_fac2 |
---|
489 | ! weighting the profile |
---|
490 | s_i_1d(ji,jk) = zalpha * zs_zero + ( 1._wp - zalpha ) * sm_i_1d(ji) |
---|
491 | END DO |
---|
492 | END DO |
---|
493 | |
---|
494 | ENDIF |
---|
495 | |
---|
496 | !------------------------------------------------------- |
---|
497 | ! Vertically varying salinity profile, constant in time |
---|
498 | !------------------------------------------------------- |
---|
499 | |
---|
500 | IF( num_sal == 3 ) THEN ! Schwarzacher (1959) multiyear salinity profile (mean = 2.30) |
---|
501 | ! |
---|
502 | sm_i_1d(:) = 2.30_wp |
---|
503 | ! |
---|
504 | DO jk = 1, nlay_i |
---|
505 | zargtemp = ( REAL(jk,wp) - 0.5_wp ) / REAL(nlay_i,wp) |
---|
506 | zsal = 1.6_wp * ( 1._wp - COS( rpi * zargtemp**(0.407_wp/(0.573_wp+zargtemp)) ) ) |
---|
507 | DO ji = kideb, kiut |
---|
508 | s_i_1d(ji,jk) = zsal |
---|
509 | END DO |
---|
510 | END DO |
---|
511 | ! |
---|
512 | ENDIF |
---|
513 | ! |
---|
514 | CALL wrk_dealloc( jpij, z_slope_s ) |
---|
515 | ! |
---|
516 | END SUBROUTINE lim_var_salprof1d |
---|
517 | |
---|
518 | SUBROUTINE lim_var_zapsmall |
---|
519 | !!------------------------------------------------------------------- |
---|
520 | !! *** ROUTINE lim_var_zapsmall *** |
---|
521 | !! |
---|
522 | !! ** Purpose : Remove too small sea ice areas and correct salt fluxes |
---|
523 | !! |
---|
524 | !! history : LIM3.5 - 01-2014 (C. Rousset) original code |
---|
525 | !!------------------------------------------------------------------- |
---|
526 | INTEGER :: ji, jj, jl, jk ! dummy loop indices |
---|
527 | |
---|
528 | REAL(wp) :: zsal, zvi, zvs, zei, zes |
---|
529 | !!------------------------------------------------------------------- |
---|
530 | |
---|
531 | DO jl = 1, jpl |
---|
532 | |
---|
533 | !----------------------------------------------------------------- |
---|
534 | ! Zap ice energy and use ocean heat to melt ice |
---|
535 | !----------------------------------------------------------------- |
---|
536 | DO jk = 1, nlay_i |
---|
537 | DO jj = 1 , jpj |
---|
538 | DO ji = 1 , jpi |
---|
539 | rswitch = MAX( 0._wp , SIGN( 1._wp, a_i(ji,jj,jl) - epsi10 ) ) |
---|
540 | zei = e_i(ji,jj,jk,jl) |
---|
541 | e_i(ji,jj,jk,jl) = e_i(ji,jj,jk,jl) * rswitch |
---|
542 | t_i(ji,jj,jk,jl) = t_i(ji,jj,jk,jl) * rswitch + rtt * ( 1._wp - rswitch ) |
---|
543 | ! update exchanges with ocean |
---|
544 | hfx_res(ji,jj) = hfx_res(ji,jj) + ( e_i(ji,jj,jk,jl) - zei ) * unit_fac / area(ji,jj) * r1_rdtice ! W.m-2 <0 |
---|
545 | END DO |
---|
546 | END DO |
---|
547 | END DO |
---|
548 | |
---|
549 | DO jj = 1 , jpj |
---|
550 | DO ji = 1 , jpi |
---|
551 | rswitch = MAX( 0._wp , SIGN( 1._wp, a_i(ji,jj,jl) - epsi10 ) ) |
---|
552 | |
---|
553 | zsal = smv_i(ji,jj, jl) |
---|
554 | zvi = v_i (ji,jj, jl) |
---|
555 | zvs = v_s (ji,jj, jl) |
---|
556 | zes = e_s (ji,jj,1,jl) |
---|
557 | !----------------------------------------------------------------- |
---|
558 | ! Zap snow energy |
---|
559 | !----------------------------------------------------------------- |
---|
560 | t_s(ji,jj,1,jl) = t_s(ji,jj,1,jl) * rswitch + rtt * ( 1._wp - rswitch ) |
---|
561 | e_s(ji,jj,1,jl) = e_s(ji,jj,1,jl) * rswitch |
---|
562 | |
---|
563 | !----------------------------------------------------------------- |
---|
564 | ! zap ice and snow volume, add water and salt to ocean |
---|
565 | !----------------------------------------------------------------- |
---|
566 | ato_i(ji,jj) = a_i (ji,jj,jl) * ( 1._wp - rswitch ) + ato_i(ji,jj) |
---|
567 | a_i (ji,jj,jl) = a_i (ji,jj,jl) * rswitch |
---|
568 | v_i (ji,jj,jl) = v_i (ji,jj,jl) * rswitch |
---|
569 | v_s (ji,jj,jl) = v_s (ji,jj,jl) * rswitch |
---|
570 | t_su (ji,jj,jl) = t_su (ji,jj,jl) * rswitch + t_bo(ji,jj) * ( 1._wp - rswitch ) |
---|
571 | oa_i (ji,jj,jl) = oa_i (ji,jj,jl) * rswitch |
---|
572 | smv_i(ji,jj,jl) = smv_i(ji,jj,jl) * rswitch |
---|
573 | |
---|
574 | ! ice salinity must stay in bounds |
---|
575 | IF( num_sal == 2 ) THEN |
---|
576 | smv_i(ji,jj,jl) = MAX( MIN( s_i_max * v_i(ji,jj,jl), smv_i(ji,jj,jl) ), s_i_min * v_i(ji,jj,jl) ) |
---|
577 | ENDIF |
---|
578 | ! update exchanges with ocean |
---|
579 | sfx_res(ji,jj) = sfx_res(ji,jj) - ( smv_i(ji,jj,jl) - zsal ) * rhoic * r1_rdtice |
---|
580 | wfx_res(ji,jj) = wfx_res(ji,jj) - ( v_i(ji,jj,jl) - zvi ) * rhoic * r1_rdtice |
---|
581 | wfx_snw(ji,jj) = wfx_snw(ji,jj) - ( v_s(ji,jj,jl) - zvs ) * rhosn * r1_rdtice |
---|
582 | hfx_res(ji,jj) = hfx_res(ji,jj) + ( e_s(ji,jj,1,jl) - zes ) * unit_fac / area(ji,jj) * r1_rdtice ! W.m-2 <0 |
---|
583 | END DO |
---|
584 | END DO |
---|
585 | END DO ! jl |
---|
586 | |
---|
587 | ! to be sure that at_i is the sum of a_i(jl) |
---|
588 | at_i(:,:) = SUM( a_i(:,:,:), dim=3 ) |
---|
589 | ! |
---|
590 | END SUBROUTINE lim_var_zapsmall |
---|
591 | |
---|
592 | SUBROUTINE lim_var_itd( zhti, zhts, zai, zht_i, zht_s, za_i ) |
---|
593 | !!------------------------------------------------------------------ |
---|
594 | !! *** ROUTINE lim_var_itd *** |
---|
595 | !! |
---|
596 | !! ** Purpose : converting 1-cat ice to multiple ice categories |
---|
597 | !! |
---|
598 | !! ice thickness distribution follows a gaussian law |
---|
599 | !! around the concentration of the most likely ice thickness |
---|
600 | !! (similar as limistate.F90) |
---|
601 | !! |
---|
602 | !! ** Method: Iterative procedure |
---|
603 | !! |
---|
604 | !! 1) Try to fill the jpl ice categories (bounds hi_max(0:jpl)) with a gaussian |
---|
605 | !! |
---|
606 | !! 2) Check whether the distribution conserves area and volume, positivity and |
---|
607 | !! category boundaries |
---|
608 | !! |
---|
609 | !! 3) If not (input ice is too thin), the last category is empty and |
---|
610 | !! the number of categories is reduced (jpl-1) |
---|
611 | !! |
---|
612 | !! 4) Iterate until ok (SUM(itest(:) = 4) |
---|
613 | !! |
---|
614 | !! ** Arguments : zhti: 1-cat ice thickness |
---|
615 | !! zhts: 1-cat snow depth |
---|
616 | !! zai : 1-cat ice concentration |
---|
617 | !! |
---|
618 | !! ** Output : jpl-cat |
---|
619 | !! |
---|
620 | !! (Example of application: BDY forcings when input are cell averaged) |
---|
621 | !! |
---|
622 | !!------------------------------------------------------------------- |
---|
623 | !! History : LIM3.5 - 2012 (M. Vancoppenolle) Original code |
---|
624 | !! 2014 (C. Rousset) Rewriting |
---|
625 | !!------------------------------------------------------------------- |
---|
626 | !! Local variables |
---|
627 | INTEGER :: ji, jk, jl ! dummy loop indices |
---|
628 | INTEGER :: ijpij, i_fill, jl0 |
---|
629 | REAL(wp) :: zarg, zV, zconv, zdh |
---|
630 | REAL(wp), DIMENSION(:), INTENT(in) :: zhti, zhts, zai ! input ice/snow variables |
---|
631 | REAL(wp), DIMENSION(:,:), INTENT(inout) :: zht_i, zht_s, za_i ! output ice/snow variables |
---|
632 | INTEGER , POINTER, DIMENSION(:) :: itest |
---|
633 | |
---|
634 | CALL wrk_alloc( 4, itest ) |
---|
635 | !-------------------------------------------------------------------- |
---|
636 | ! initialisation of variables |
---|
637 | !-------------------------------------------------------------------- |
---|
638 | ijpij = SIZE(zhti,1) |
---|
639 | zht_i(1:ijpij,1:jpl) = 0._wp |
---|
640 | zht_s(1:ijpij,1:jpl) = 0._wp |
---|
641 | za_i (1:ijpij,1:jpl) = 0._wp |
---|
642 | |
---|
643 | ! ---------------------------------------- |
---|
644 | ! distribution over the jpl ice categories |
---|
645 | ! ---------------------------------------- |
---|
646 | DO ji = 1, ijpij |
---|
647 | |
---|
648 | IF( zhti(ji) > 0._wp ) THEN |
---|
649 | |
---|
650 | ! initialisation of tests |
---|
651 | itest(:) = 0 |
---|
652 | |
---|
653 | i_fill = jpl + 1 !==================================== |
---|
654 | DO WHILE ( ( SUM( itest(:) ) /= 4 ) .AND. ( i_fill >= 2 ) ) ! iterative loop on i_fill categories |
---|
655 | ! iteration !==================================== |
---|
656 | i_fill = i_fill - 1 |
---|
657 | |
---|
658 | ! initialisation of ice variables for each try |
---|
659 | zht_i(ji,1:jpl) = 0._wp |
---|
660 | za_i (ji,1:jpl) = 0._wp |
---|
661 | |
---|
662 | ! *** case very thin ice: fill only category 1 |
---|
663 | IF ( i_fill == 1 ) THEN |
---|
664 | zht_i(ji,1) = zhti(ji) |
---|
665 | za_i (ji,1) = zai (ji) |
---|
666 | |
---|
667 | ! *** case ice is thicker: fill categories >1 |
---|
668 | ELSE |
---|
669 | |
---|
670 | ! Fill ice thicknesses except the last one (i_fill) by hmean |
---|
671 | DO jl = 1, i_fill - 1 |
---|
672 | zht_i(ji,jl) = hi_mean(jl) |
---|
673 | END DO |
---|
674 | |
---|
675 | ! find which category (jl0) the input ice thickness falls into |
---|
676 | jl0 = i_fill |
---|
677 | DO jl = 1, i_fill |
---|
678 | IF ( ( zhti(ji) >= hi_max(jl-1) ) .AND. ( zhti(ji) < hi_max(jl) ) ) THEN |
---|
679 | jl0 = jl |
---|
680 | CYCLE |
---|
681 | ENDIF |
---|
682 | END DO |
---|
683 | |
---|
684 | ! Concentrations in the (i_fill-1) categories |
---|
685 | za_i(ji,jl0) = zai(ji) / SQRT(REAL(jpl)) |
---|
686 | DO jl = 1, i_fill - 1 |
---|
687 | IF ( jl == jl0 ) CYCLE |
---|
688 | zarg = ( zht_i(ji,jl) - zhti(ji) ) / ( zhti(ji) * 0.5_wp ) |
---|
689 | za_i(ji,jl) = za_i (ji,jl0) * EXP(-zarg**2) |
---|
690 | END DO |
---|
691 | |
---|
692 | ! Concentration in the last (i_fill) category |
---|
693 | za_i(ji,i_fill) = zai(ji) - SUM( za_i(ji,1:i_fill-1) ) |
---|
694 | |
---|
695 | ! Ice thickness in the last (i_fill) category |
---|
696 | zV = SUM( za_i(ji,1:i_fill-1) * zht_i(ji,1:i_fill-1) ) |
---|
697 | zht_i(ji,i_fill) = ( zhti(ji) * zai(ji) - zV ) / za_i(ji,i_fill) |
---|
698 | |
---|
699 | ENDIF ! case ice is thick or thin |
---|
700 | |
---|
701 | !--------------------- |
---|
702 | ! Compatibility tests |
---|
703 | !--------------------- |
---|
704 | ! Test 1: area conservation |
---|
705 | zconv = ABS( zai(ji) - SUM( za_i(ji,1:jpl) ) ) |
---|
706 | IF ( zconv < epsi06 ) itest(1) = 1 |
---|
707 | |
---|
708 | ! Test 2: volume conservation |
---|
709 | zconv = ABS( zhti(ji)*zai(ji) - SUM( za_i(ji,1:jpl)*zht_i(ji,1:jpl) ) ) |
---|
710 | IF ( zconv < epsi06 ) itest(2) = 1 |
---|
711 | |
---|
712 | ! Test 3: thickness of the last category is in-bounds ? |
---|
713 | IF ( zht_i(ji,i_fill) >= hi_max(i_fill-1) ) itest(3) = 1 |
---|
714 | |
---|
715 | ! Test 4: positivity of ice concentrations |
---|
716 | itest(4) = 1 |
---|
717 | DO jl = 1, i_fill |
---|
718 | IF ( za_i(ji,jl) < 0._wp ) itest(4) = 0 |
---|
719 | END DO |
---|
720 | !============================ |
---|
721 | END DO ! end iteration on categories |
---|
722 | !============================ |
---|
723 | ENDIF ! if zhti > 0 |
---|
724 | END DO ! i loop |
---|
725 | |
---|
726 | ! ------------------------------------------------ |
---|
727 | ! Adding Snow in each category where za_i is not 0 |
---|
728 | ! ------------------------------------------------ |
---|
729 | DO jl = 1, jpl |
---|
730 | DO ji = 1, ijpij |
---|
731 | IF( za_i(ji,jl) > 0._wp ) THEN |
---|
732 | zht_s(ji,jl) = zht_i(ji,jl) * ( zhts(ji) / zhti(ji) ) |
---|
733 | ! In case snow load is in excess that would lead to transformation from snow to ice |
---|
734 | ! Then, transfer the snow excess into the ice (different from limthd_dh) |
---|
735 | zdh = MAX( 0._wp, ( rhosn * zht_s(ji,jl) + ( rhoic - rau0 ) * zht_i(ji,jl) ) * r1_rau0 ) |
---|
736 | ! recompute ht_i, ht_s avoiding out of bounds values |
---|
737 | zht_i(ji,jl) = MIN( hi_max(jl), zht_i(ji,jl) + zdh ) |
---|
738 | zht_s(ji,jl) = MAX( 0._wp, zht_s(ji,jl) - zdh * rhoic / rhosn ) |
---|
739 | ENDIF |
---|
740 | ENDDO |
---|
741 | ENDDO |
---|
742 | |
---|
743 | CALL wrk_dealloc( 4, itest ) |
---|
744 | ! |
---|
745 | END SUBROUTINE lim_var_itd |
---|
746 | |
---|
747 | |
---|
748 | #else |
---|
749 | !!---------------------------------------------------------------------- |
---|
750 | !! Default option Dummy module NO LIM3 sea-ice model |
---|
751 | !!---------------------------------------------------------------------- |
---|
752 | CONTAINS |
---|
753 | SUBROUTINE lim_var_agg ! Empty routines |
---|
754 | END SUBROUTINE lim_var_agg |
---|
755 | SUBROUTINE lim_var_glo2eqv ! Empty routines |
---|
756 | END SUBROUTINE lim_var_glo2eqv |
---|
757 | SUBROUTINE lim_var_eqv2glo ! Empty routines |
---|
758 | END SUBROUTINE lim_var_eqv2glo |
---|
759 | SUBROUTINE lim_var_salprof ! Empty routines |
---|
760 | END SUBROUTINE lim_var_salprof |
---|
761 | SUBROUTINE lim_var_bv ! Emtpy routines |
---|
762 | END SUBROUTINE lim_var_bv |
---|
763 | SUBROUTINE lim_var_salprof1d ! Emtpy routines |
---|
764 | END SUBROUTINE lim_var_salprof1d |
---|
765 | SUBROUTINE lim_var_zapsmall |
---|
766 | END SUBROUTINE lim_var_zapsmall |
---|
767 | SUBROUTINE lim_var_itd |
---|
768 | END SUBROUTINE lim_var_itd |
---|
769 | #endif |
---|
770 | |
---|
771 | !!====================================================================== |
---|
772 | END MODULE limvar |
---|