1 | MODULE icevar |
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2 | !!====================================================================== |
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3 | !! *** MODULE icevar *** |
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4 | !! sea-ice: 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 | !! - sv_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 | !! - h_i(jpi,jpj,jpl) |
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18 | !! - h_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 | !! - sm_i(jpi,jpj) !mean ice salinity |
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29 | !! - tm_i (jpi,jpj) !mean ice temperature |
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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 | !! 3.5 ! 2012 (M. Vancoppenolle) add ice_var_itd |
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34 | !! 3.6 ! 2014-01 (C. Rousset) add ice_var_zapsmall, rewrite ice_var_itd |
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35 | !!---------------------------------------------------------------------- |
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36 | #if defined key_lim3 |
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37 | !!---------------------------------------------------------------------- |
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38 | !! 'key_lim3' ESIM sea-ice model |
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39 | !!---------------------------------------------------------------------- |
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40 | !! ice_var_agg : integrate variables over layers and categories |
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41 | !! ice_var_glo2eqv : transform from VGLO to VEQV |
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42 | !! ice_var_eqv2glo : transform from VEQV to VGLO |
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43 | !! ice_var_salprof : salinity profile in the ice |
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44 | !! ice_var_salprof1d : salinity profile in the ice 1D |
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45 | !! ice_var_zapsmall : remove very small area and volume |
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46 | !! ice_var_itd : convert 1-cat to jpl-cat |
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47 | !! ice_var_itd2 : convert N-cat to jpl-cat |
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48 | !! ice_var_bv : brine volume |
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49 | !! ice_var_enthalpy : compute ice and snow enthalpies from temperature |
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50 | !!---------------------------------------------------------------------- |
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51 | USE dom_oce ! ocean space and time domain |
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52 | USE phycst ! physical constants (ocean directory) |
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53 | USE sbc_oce , ONLY : sss_m |
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54 | USE ice ! sea-ice: variables |
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55 | USE ice1D ! sea-ice: thermodynamics variables |
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56 | ! |
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57 | USE in_out_manager ! I/O manager |
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58 | USE lib_mpp ! MPP library |
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59 | USE lib_fortran ! fortran utilities (glob_sum + no signed zero) |
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60 | |
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61 | IMPLICIT NONE |
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62 | PRIVATE |
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63 | |
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64 | PUBLIC ice_var_agg |
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65 | PUBLIC ice_var_glo2eqv |
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66 | PUBLIC ice_var_eqv2glo |
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67 | PUBLIC ice_var_salprof |
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68 | PUBLIC ice_var_salprof1d |
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69 | PUBLIC ice_var_zapsmall |
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70 | PUBLIC ice_var_itd |
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71 | PUBLIC ice_var_itd2 |
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72 | PUBLIC ice_var_bv |
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73 | PUBLIC ice_var_enthalpy |
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74 | |
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75 | !!---------------------------------------------------------------------- |
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76 | !! NEMO/ICE 4.0 , NEMO Consortium (2017) |
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77 | !! $Id: icevar.F90 8422 2017-08-08 13:58:05Z clem $ |
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78 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
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79 | !!---------------------------------------------------------------------- |
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80 | CONTAINS |
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81 | |
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82 | SUBROUTINE ice_var_agg( kn ) |
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83 | !!------------------------------------------------------------------- |
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84 | !! *** ROUTINE ice_var_agg *** |
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85 | !! |
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86 | !! ** Purpose : aggregates ice-thickness-category variables to |
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87 | !! all-ice variables, i.e. it turns VGLO into VAGG |
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88 | !!------------------------------------------------------------------- |
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89 | INTEGER, INTENT( in ) :: kn ! =1 state variables only |
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90 | ! ! >1 state variables + others |
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91 | ! |
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92 | INTEGER :: ji, jj, jk, jl ! dummy loop indices |
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93 | REAL(wp), ALLOCATABLE, DIMENSION(:,:) :: z1_at_i, z1_vt_i |
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94 | !!------------------------------------------------------------------- |
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95 | ! |
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96 | ! ! integrated values |
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97 | vt_i(:,:) = SUM( v_i(:,:,:) , dim=3 ) |
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98 | vt_s(:,:) = SUM( v_s(:,:,:) , dim=3 ) |
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99 | at_i(:,:) = SUM( a_i(:,:,:) , dim=3 ) |
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100 | et_s(:,:) = SUM( SUM( e_s(:,:,:,:), dim=4 ), dim=3 ) |
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101 | et_i(:,:) = SUM( SUM( e_i(:,:,:,:), dim=4 ), dim=3 ) |
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102 | ! |
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103 | at_ip(:,:) = SUM( a_ip(:,:,:), dim=3 ) ! melt ponds |
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104 | vt_ip(:,:) = SUM( v_ip(:,:,:), dim=3 ) |
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105 | ! |
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106 | ato_i(:,:) = 1._wp - at_i(:,:) ! open water fraction |
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107 | |
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108 | IF( kn > 1 ) THEN |
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109 | ! |
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110 | ALLOCATE( z1_at_i(jpi,jpj) , z1_vt_i(jpi,jpj) ) |
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111 | WHERE( at_i(:,:) > epsi20 ) ; z1_at_i(:,:) = 1._wp / at_i(:,:) |
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112 | ELSEWHERE ; z1_at_i(:,:) = 0._wp |
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113 | END WHERE |
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114 | WHERE( vt_i(:,:) > epsi20 ) ; z1_vt_i(:,:) = 1._wp / vt_i(:,:) |
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115 | ELSEWHERE ; z1_vt_i(:,:) = 0._wp |
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116 | END WHERE |
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117 | ! |
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118 | ! ! mean ice/snow thickness |
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119 | hm_i(:,:) = vt_i(:,:) * z1_at_i(:,:) |
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120 | hm_s(:,:) = vt_s(:,:) * z1_at_i(:,:) |
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121 | ! |
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122 | ! ! mean temperature (K), salinity and age |
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123 | tm_su(:,:) = SUM( t_su(:,:,:) * a_i(:,:,:) , dim=3 ) * z1_at_i(:,:) |
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124 | tm_si(:,:) = SUM( t_si(:,:,:) * a_i(:,:,:) , dim=3 ) * z1_at_i(:,:) |
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125 | om_i (:,:) = SUM( oa_i(:,:,:) , dim=3 ) * z1_at_i(:,:) |
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126 | ! |
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127 | tm_i(:,:) = 0._wp |
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128 | sm_i(:,:) = 0._wp |
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129 | DO jl = 1, jpl |
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130 | DO jk = 1, nlay_i |
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131 | tm_i(:,:) = tm_i(:,:) + r1_nlay_i * t_i (:,:,jk,jl) * v_i(:,:,jl) * z1_vt_i(:,:) |
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132 | sm_i(:,:) = sm_i(:,:) + r1_nlay_i * sz_i(:,:,jk,jl) * v_i(:,:,jl) * z1_vt_i(:,:) |
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133 | END DO |
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134 | END DO |
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135 | ! |
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136 | ! ! put rt0 where there is no ice |
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137 | WHERE( at_i(:,:)<=epsi20 ) |
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138 | tm_su(:,:) = rt0 |
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139 | tm_si(:,:) = rt0 |
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140 | tm_i (:,:) = rt0 |
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141 | END WHERE |
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142 | |
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143 | DEALLOCATE( z1_at_i , z1_vt_i ) |
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144 | ENDIF |
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145 | ! |
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146 | END SUBROUTINE ice_var_agg |
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147 | |
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148 | |
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149 | SUBROUTINE ice_var_glo2eqv |
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150 | !!------------------------------------------------------------------- |
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151 | !! *** ROUTINE ice_var_glo2eqv *** |
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152 | !! |
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153 | !! ** Purpose : computes equivalent variables as function of |
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154 | !! global variables, i.e. it turns VGLO into VEQV |
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155 | !!------------------------------------------------------------------- |
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156 | INTEGER :: ji, jj, jk, jl ! dummy loop indices |
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157 | REAL(wp) :: ze_i ! local scalars |
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158 | REAL(wp) :: ze_s, ztmelts, zbbb, zccc ! - - |
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159 | REAL(wp) :: zhmax, z1_zhmax ! - - |
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160 | REAL(wp) :: zlay_i, zlay_s ! - - |
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161 | REAL(wp), DIMENSION(jpi,jpj,jpl) :: z1_a_i, z1_v_i |
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162 | !!------------------------------------------------------------------- |
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163 | |
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164 | !!gm Question 2: It is possible to define existence of sea-ice in a common way between |
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165 | !! ice area and ice volume ? |
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166 | !! the idea is to be able to define one for all at the begining of this routine |
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167 | !! a criteria for icy area (i.e. a_i > epsi20 and v_i > epsi20 ) |
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168 | |
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169 | !--------------------------------------------------------------- |
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170 | ! Ice thickness, snow thickness, ice salinity, ice age and ponds |
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171 | !--------------------------------------------------------------- |
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172 | ! !--- inverse of the ice area |
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173 | WHERE( a_i(:,:,:) > epsi20 ) ; z1_a_i(:,:,:) = 1._wp / a_i(:,:,:) |
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174 | ELSEWHERE ; z1_a_i(:,:,:) = 0._wp |
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175 | END WHERE |
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176 | ! |
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177 | WHERE( v_i(:,:,:) > epsi20 ) ; z1_v_i(:,:,:) = 1._wp / v_i(:,:,:) |
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178 | ELSEWHERE ; z1_v_i(:,:,:) = 0._wp |
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179 | END WHERE |
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180 | ! !--- ice thickness |
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181 | h_i(:,:,:) = v_i (:,:,:) * z1_a_i(:,:,:) |
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182 | |
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183 | zhmax = hi_max(jpl) |
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184 | z1_zhmax = 1._wp / hi_max(jpl) |
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185 | WHERE( h_i(:,:,jpl) > zhmax ) ! bound h_i by hi_max (i.e. 99 m) with associated update of ice area |
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186 | h_i (:,:,jpl) = zhmax |
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187 | a_i (:,:,jpl) = v_i(:,:,jpl) * z1_zhmax |
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188 | z1_a_i(:,:,jpl) = zhmax * z1_v_i(:,:,jpl) |
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189 | END WHERE |
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190 | ! !--- snow thickness |
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191 | h_s(:,:,:) = v_s (:,:,:) * z1_a_i(:,:,:) |
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192 | ! !--- ice age |
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193 | o_i(:,:,:) = oa_i(:,:,:) * z1_a_i(:,:,:) |
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194 | ! !--- pond fraction and thickness |
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195 | a_ip_frac(:,:,:) = a_ip(:,:,:) * z1_a_i(:,:,:) |
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196 | WHERE( a_ip_frac(:,:,:) > epsi20 ) ; h_ip(:,:,:) = v_ip(:,:,:) * z1_a_i(:,:,:) / a_ip_frac(:,:,:) |
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197 | ELSEWHERE ; h_ip(:,:,:) = 0._wp |
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198 | END WHERE |
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199 | ! |
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200 | ! !--- salinity (with a minimum value imposed everywhere) |
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201 | IF( nn_icesal == 2 ) THEN |
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202 | WHERE( v_i(:,:,:) > epsi20 ) ; s_i(:,:,:) = MAX( rn_simin , MIN( rn_simax, sv_i(:,:,:) * z1_v_i(:,:,:) ) ) |
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203 | ELSEWHERE ; s_i(:,:,:) = rn_simin |
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204 | END WHERE |
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205 | ENDIF |
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206 | CALL ice_var_salprof ! salinity profile |
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207 | |
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208 | !------------------- |
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209 | ! Ice temperature [K] (with a minimum value (rt0 - 100.)) |
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210 | !------------------- |
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211 | zlay_i = REAL( nlay_i , wp ) ! number of layers |
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212 | DO jl = 1, jpl |
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213 | DO jk = 1, nlay_i |
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214 | DO jj = 1, jpj |
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215 | DO ji = 1, jpi |
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216 | IF ( v_i(ji,jj,jl) > epsi20 ) THEN !--- icy area |
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217 | ! |
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218 | ze_i = e_i (ji,jj,jk,jl) * z1_v_i(ji,jj,jl) * zlay_i ! Energy of melting e(S,T) [J.m-3] |
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219 | ztmelts = - sz_i(ji,jj,jk,jl) * tmut ! Ice layer melt temperature [C] |
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220 | ! Conversion q(S,T) -> T (second order equation) |
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221 | zbbb = ( rcp - cpic ) * ztmelts + ze_i * r1_rhoic - lfus |
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222 | zccc = SQRT( MAX( zbbb * zbbb - 4._wp * cpic * lfus * ztmelts , 0._wp) ) |
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223 | t_i(ji,jj,jk,jl) = MAX( -100._wp , MIN( -( zbbb + zccc ) * 0.5_wp * r1_cpic , ztmelts ) ) + rt0 ! [K] with bounds: -100 < t_i < ztmelts |
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224 | ! |
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225 | ELSE !--- no ice |
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226 | t_i(ji,jj,jk,jl) = rt0 |
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227 | ENDIF |
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228 | END DO |
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229 | END DO |
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230 | END DO |
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231 | END DO |
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232 | |
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233 | !-------------------- |
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234 | ! Snow temperature [K] (with a minimum value (rt0 - 100.)) |
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235 | !-------------------- |
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236 | zlay_s = REAL( nlay_s , wp ) |
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237 | DO jk = 1, nlay_s |
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238 | WHERE( v_s(:,:,:) > epsi20 ) !--- icy area |
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239 | t_s(:,:,jk,:) = MAX( -100._wp , MIN( r1_cpic * ( -r1_rhosn * (e_s(:,:,jk,:)/v_s(:,:,:)*zlay_s) + lfus ) , 0._wp ) ) + rt0 |
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240 | ELSEWHERE !--- no ice |
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241 | t_s(:,:,jk,:) = rt0 |
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242 | END WHERE |
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243 | END DO |
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244 | ! |
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245 | ! integrated values |
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246 | vt_i (:,:) = SUM( v_i, dim=3 ) |
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247 | vt_s (:,:) = SUM( v_s, dim=3 ) |
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248 | at_i (:,:) = SUM( a_i, dim=3 ) |
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249 | ! |
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250 | END SUBROUTINE ice_var_glo2eqv |
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251 | |
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252 | |
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253 | SUBROUTINE ice_var_eqv2glo |
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254 | !!------------------------------------------------------------------- |
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255 | !! *** ROUTINE ice_var_eqv2glo *** |
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256 | !! |
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257 | !! ** Purpose : computes global variables as function of |
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258 | !! equivalent variables, i.e. it turns VEQV into VGLO |
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259 | !!------------------------------------------------------------------- |
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260 | ! |
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261 | v_i (:,:,:) = h_i (:,:,:) * a_i (:,:,:) |
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262 | v_s (:,:,:) = h_s (:,:,:) * a_i (:,:,:) |
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263 | sv_i(:,:,:) = s_i (:,:,:) * v_i (:,:,:) |
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264 | v_ip(:,:,:) = h_ip(:,:,:) * a_ip(:,:,:) |
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265 | ! |
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266 | END SUBROUTINE ice_var_eqv2glo |
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267 | |
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268 | |
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269 | SUBROUTINE ice_var_salprof |
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270 | !!------------------------------------------------------------------- |
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271 | !! *** ROUTINE ice_var_salprof *** |
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272 | !! |
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273 | !! ** Purpose : computes salinity profile in function of bulk salinity |
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274 | !! |
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275 | !! ** Method : If bulk salinity greater than zsi1, |
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276 | !! the profile is assumed to be constant (S_inf) |
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277 | !! If bulk salinity lower than zsi0, |
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278 | !! the profile is linear with 0 at the surface (S_zero) |
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279 | !! If it is between zsi0 and zsi1, it is a |
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280 | !! alpha-weighted linear combination of s_inf and s_zero |
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281 | !! |
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282 | !! ** References : Vancoppenolle et al., 2007 |
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283 | !!------------------------------------------------------------------- |
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284 | INTEGER :: ji, jj, jk, jl ! dummy loop index |
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285 | REAL(wp) :: zsal, z1_dS |
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286 | REAL(wp) :: zargtemp , zs0, zs |
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287 | REAL(wp), ALLOCATABLE, DIMENSION(:,:,:) :: z_slope_s, zalpha ! case 2 only |
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288 | REAL(wp), PARAMETER :: zsi0 = 3.5_wp |
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289 | REAL(wp), PARAMETER :: zsi1 = 4.5_wp |
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290 | !!------------------------------------------------------------------- |
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291 | |
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292 | !!gm Question: Remove the option 3 ? How many years since it last use ? |
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293 | |
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294 | SELECT CASE ( nn_icesal ) |
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295 | ! |
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296 | ! !---------------------------------------! |
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297 | CASE( 1 ) ! constant salinity in time and space ! |
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298 | ! !---------------------------------------! |
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299 | sz_i(:,:,:,:) = rn_icesal |
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300 | s_i(:,:,:) = rn_icesal |
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301 | ! |
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302 | ! !---------------------------------------------! |
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303 | CASE( 2 ) ! time varying salinity with linear profile ! |
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304 | ! !---------------------------------------------! |
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305 | ! |
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306 | ALLOCATE( z_slope_s(jpi,jpj,jpl) , zalpha(jpi,jpj,jpl) ) |
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307 | ! |
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308 | DO jl = 1, jpl |
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309 | DO jk = 1, nlay_i |
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310 | sz_i(:,:,jk,jl) = s_i(:,:,jl) |
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311 | END DO |
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312 | END DO |
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313 | ! ! Slope of the linear profile |
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314 | WHERE( h_i(:,:,:) > epsi20 ) ; z_slope_s(:,:,:) = 2._wp * s_i(:,:,:) / h_i(:,:,:) |
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315 | ELSEWHERE ; z_slope_s(:,:,:) = 0._wp |
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316 | END WHERE |
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317 | ! |
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318 | z1_dS = 1._wp / ( zsi1 - zsi0 ) |
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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 | zalpha(ji,jj,jl) = MAX( 0._wp , MIN( ( zsi1 - s_i(ji,jj,jl) ) * z1_dS , 1._wp ) ) |
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323 | ! ! force a constant profile when SSS too low (Baltic Sea) |
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324 | IF( 2._wp * s_i(ji,jj,jl) >= sss_m(ji,jj) ) zalpha(ji,jj,jl) = 0._wp |
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325 | END DO |
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326 | END DO |
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327 | END DO |
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328 | ! |
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329 | ! Computation of the profile |
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330 | DO jl = 1, jpl |
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331 | DO jk = 1, nlay_i |
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332 | DO jj = 1, jpj |
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333 | DO ji = 1, jpi |
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334 | ! ! linear profile with 0 surface value |
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335 | zs0 = z_slope_s(ji,jj,jl) * ( REAL(jk,wp) - 0.5_wp ) * h_i(ji,jj,jl) * r1_nlay_i |
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336 | zs = zalpha(ji,jj,jl) * zs0 + ( 1._wp - zalpha(ji,jj,jl) ) * s_i(ji,jj,jl) ! weighting the profile |
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337 | sz_i(ji,jj,jk,jl) = MIN( rn_simax, MAX( zs, rn_simin ) ) |
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338 | END DO |
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339 | END DO |
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340 | END DO |
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341 | END DO |
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342 | ! |
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343 | DEALLOCATE( z_slope_s , zalpha ) |
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344 | ! |
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345 | ! !-------------------------------------------! |
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346 | CASE( 3 ) ! constant salinity with a fix profile ! (Schwarzacher (1959) multiyear salinity profile |
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347 | ! !-------------------------------------------! (mean = 2.30) |
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348 | ! |
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349 | s_i(:,:,:) = 2.30_wp |
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350 | !!gm Remark: if we keep the case 3, then compute an store one for all time-step |
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351 | !! a array S_prof(1:nlay_i) containing the calculation and just do: |
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352 | ! DO jk = 1, nlay_i |
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353 | ! sz_i(:,:,jk,:) = S_prof(jk) |
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354 | ! END DO |
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355 | !!gm end |
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356 | ! |
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357 | DO jl = 1, jpl |
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358 | DO jk = 1, nlay_i |
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359 | zargtemp = ( REAL(jk,wp) - 0.5_wp ) * r1_nlay_i |
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360 | sz_i(:,:,jk,jl) = 1.6_wp * ( 1._wp - COS( rpi * zargtemp**(0.407_wp/(0.573_wp+zargtemp)) ) ) |
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361 | END DO |
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362 | END DO |
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363 | ! |
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364 | END SELECT |
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365 | ! |
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366 | END SUBROUTINE ice_var_salprof |
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367 | |
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368 | |
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369 | SUBROUTINE ice_var_salprof1d |
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370 | !!------------------------------------------------------------------- |
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371 | !! *** ROUTINE ice_var_salprof1d *** |
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372 | !! |
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373 | !! ** Purpose : 1d computation of the sea ice salinity profile |
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374 | !! Works with 1d vectors and is used by thermodynamic modules |
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375 | !!------------------------------------------------------------------- |
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376 | INTEGER :: ji, jk ! dummy loop indices |
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377 | REAL(wp) :: zargtemp, zsal, z1_dS ! local scalars |
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378 | REAL(wp) :: zs, zs0 ! - - |
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379 | ! |
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380 | REAL(wp), ALLOCATABLE, DIMENSION(:) :: z_slope_s, zalpha ! |
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381 | REAL(wp), PARAMETER :: zsi0 = 3.5_wp |
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382 | REAL(wp), PARAMETER :: zsi1 = 4.5_wp |
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383 | !!------------------------------------------------------------------- |
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384 | ! |
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385 | SELECT CASE ( nn_icesal ) |
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386 | ! |
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387 | ! !---------------------------------------! |
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388 | CASE( 1 ) ! constant salinity in time and space ! |
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389 | ! !---------------------------------------! |
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390 | sz_i_1d(1:npti,:) = rn_icesal |
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391 | ! |
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392 | ! !---------------------------------------------! |
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393 | CASE( 2 ) ! time varying salinity with linear profile ! |
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394 | ! !---------------------------------------------! |
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395 | ! |
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396 | ALLOCATE( z_slope_s(jpij), zalpha(jpij) ) |
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397 | ! |
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398 | ! ! Slope of the linear profile |
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399 | WHERE( h_i_1d(1:npti) > epsi20 ) ; z_slope_s(1:npti) = 2._wp * s_i_1d(1:npti) / h_i_1d(1:npti) |
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400 | ELSEWHERE ; z_slope_s(1:npti) = 0._wp |
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401 | END WHERE |
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402 | |
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403 | z1_dS = 1._wp / ( zsi1 - zsi0 ) |
---|
404 | DO ji = 1, npti |
---|
405 | zalpha(ji) = MAX( 0._wp , MIN( ( zsi1 - s_i_1d(ji) ) * z1_dS , 1._wp ) ) |
---|
406 | ! ! force a constant profile when SSS too low (Baltic Sea) |
---|
407 | IF( 2._wp * s_i_1d(ji) >= sss_1d(ji) ) zalpha(ji) = 0._wp |
---|
408 | END DO |
---|
409 | ! |
---|
410 | ! Computation of the profile |
---|
411 | DO jk = 1, nlay_i |
---|
412 | DO ji = 1, npti |
---|
413 | ! ! linear profile with 0 surface value |
---|
414 | zs0 = z_slope_s(ji) * ( REAL(jk,wp) - 0.5_wp ) * h_i_1d(ji) * r1_nlay_i |
---|
415 | zs = zalpha(ji) * zs0 + ( 1._wp - zalpha(ji) ) * s_i_1d(ji) |
---|
416 | sz_i_1d(ji,jk) = MIN( rn_simax , MAX( zs , rn_simin ) ) |
---|
417 | END DO |
---|
418 | END DO |
---|
419 | ! |
---|
420 | DEALLOCATE( z_slope_s, zalpha ) |
---|
421 | |
---|
422 | ! !-------------------------------------------! |
---|
423 | CASE( 3 ) ! constant salinity with a fix profile ! (Schwarzacher (1959) multiyear salinity profile |
---|
424 | ! !-------------------------------------------! (mean = 2.30) |
---|
425 | ! |
---|
426 | s_i_1d(1:npti) = 2.30_wp |
---|
427 | ! |
---|
428 | !!gm cf remark in ice_var_salprof routine, CASE( 3 ) |
---|
429 | DO jk = 1, nlay_i |
---|
430 | zargtemp = ( REAL(jk,wp) - 0.5_wp ) * r1_nlay_i |
---|
431 | zsal = 1.6_wp * ( 1._wp - COS( rpi * zargtemp**( 0.407_wp / ( 0.573_wp + zargtemp ) ) ) ) |
---|
432 | DO ji = 1, npti |
---|
433 | sz_i_1d(ji,jk) = zsal |
---|
434 | END DO |
---|
435 | END DO |
---|
436 | ! |
---|
437 | END SELECT |
---|
438 | ! |
---|
439 | END SUBROUTINE ice_var_salprof1d |
---|
440 | |
---|
441 | |
---|
442 | SUBROUTINE ice_var_zapsmall |
---|
443 | !!------------------------------------------------------------------- |
---|
444 | !! *** ROUTINE ice_var_zapsmall *** |
---|
445 | !! |
---|
446 | !! ** Purpose : Remove too small sea ice areas and correct fluxes |
---|
447 | !!------------------------------------------------------------------- |
---|
448 | INTEGER :: ji, jj, jl, jk ! dummy loop indices |
---|
449 | REAL(wp), DIMENSION(jpi,jpj) :: zswitch |
---|
450 | !!------------------------------------------------------------------- |
---|
451 | ! |
---|
452 | DO jl = 1, jpl !== loop over the categories ==! |
---|
453 | ! |
---|
454 | !----------------------------------------------------------------- |
---|
455 | ! Zap ice energy and use ocean heat to melt ice |
---|
456 | !----------------------------------------------------------------- |
---|
457 | WHERE( a_i(:,:,jl) > epsi20 ) ; h_i(:,:,jl) = v_i(:,:,jl) / a_i(:,:,jl) |
---|
458 | ELSEWHERE ; h_i(:,:,jl) = 0._wp |
---|
459 | END WHERE |
---|
460 | ! |
---|
461 | WHERE( a_i(:,:,jl) < epsi10 .OR. v_i(:,:,jl) < epsi10 .OR. h_i(:,:,jl) < epsi10 ) ; zswitch(:,:) = 0._wp |
---|
462 | ELSEWHERE ; zswitch(:,:) = 1._wp |
---|
463 | END WHERE |
---|
464 | ! |
---|
465 | DO jk = 1, nlay_i |
---|
466 | DO jj = 1 , jpj |
---|
467 | DO ji = 1 , jpi |
---|
468 | ! update exchanges with ocean |
---|
469 | hfx_res(ji,jj) = hfx_res(ji,jj) - (1._wp - zswitch(ji,jj) ) * e_i(ji,jj,jk,jl) * r1_rdtice ! W.m-2 <0 |
---|
470 | e_i(ji,jj,jk,jl) = e_i(ji,jj,jk,jl) * zswitch(ji,jj) |
---|
471 | t_i(ji,jj,jk,jl) = t_i(ji,jj,jk,jl) * zswitch(ji,jj) + rt0 * ( 1._wp - zswitch(ji,jj) ) |
---|
472 | END DO |
---|
473 | END DO |
---|
474 | END DO |
---|
475 | ! |
---|
476 | DO jj = 1 , jpj |
---|
477 | DO ji = 1 , jpi |
---|
478 | ! update exchanges with ocean |
---|
479 | sfx_res(ji,jj) = sfx_res(ji,jj) + (1._wp - zswitch(ji,jj) ) * sv_i(ji,jj,jl) * rhoic * r1_rdtice |
---|
480 | wfx_res(ji,jj) = wfx_res(ji,jj) + (1._wp - zswitch(ji,jj) ) * v_i (ji,jj,jl) * rhoic * r1_rdtice |
---|
481 | wfx_res(ji,jj) = wfx_res(ji,jj) + (1._wp - zswitch(ji,jj) ) * v_s (ji,jj,jl) * rhosn * r1_rdtice |
---|
482 | hfx_res(ji,jj) = hfx_res(ji,jj) - (1._wp - zswitch(ji,jj) ) * e_s (ji,jj,1,jl) * r1_rdtice ! W.m-2 <0 |
---|
483 | !----------------------------------------------------------------- |
---|
484 | ! Zap snow energy |
---|
485 | !----------------------------------------------------------------- |
---|
486 | t_s(ji,jj,1,jl) = t_s(ji,jj,1,jl) * zswitch(ji,jj) + rt0 * ( 1._wp - zswitch(ji,jj) ) |
---|
487 | e_s(ji,jj,1,jl) = e_s(ji,jj,1,jl) * zswitch(ji,jj) |
---|
488 | ! |
---|
489 | !----------------------------------------------------------------- |
---|
490 | ! zap ice and snow volume, add water and salt to ocean |
---|
491 | !----------------------------------------------------------------- |
---|
492 | ato_i(ji,jj) = a_i (ji,jj,jl) * ( 1._wp - zswitch(ji,jj) ) + ato_i(ji,jj) |
---|
493 | a_i (ji,jj,jl) = a_i (ji,jj,jl) * zswitch(ji,jj) |
---|
494 | v_i (ji,jj,jl) = v_i (ji,jj,jl) * zswitch(ji,jj) |
---|
495 | v_s (ji,jj,jl) = v_s (ji,jj,jl) * zswitch(ji,jj) |
---|
496 | t_su (ji,jj,jl) = t_su(ji,jj,jl) * zswitch(ji,jj) + t_bo(ji,jj) * ( 1._wp - zswitch(ji,jj) ) |
---|
497 | oa_i (ji,jj,jl) = oa_i(ji,jj,jl) * zswitch(ji,jj) |
---|
498 | sv_i (ji,jj,jl) = sv_i(ji,jj,jl) * zswitch(ji,jj) |
---|
499 | ! |
---|
500 | h_i (ji,jj,jl) = h_i (ji,jj,jl) * zswitch(ji,jj) |
---|
501 | h_s (ji,jj,jl) = h_s (ji,jj,jl) * zswitch(ji,jj) |
---|
502 | ! |
---|
503 | a_ip (ji,jj,jl) = a_ip (ji,jj,jl) * zswitch(ji,jj) |
---|
504 | v_ip (ji,jj,jl) = v_ip (ji,jj,jl) * zswitch(ji,jj) |
---|
505 | ! |
---|
506 | END DO |
---|
507 | END DO |
---|
508 | ! |
---|
509 | END DO |
---|
510 | |
---|
511 | ! to be sure that at_i is the sum of a_i(jl) |
---|
512 | at_i (:,:) = SUM( a_i(:,:,:), dim=3 ) |
---|
513 | vt_i (:,:) = SUM( v_i(:,:,:), dim=3 ) |
---|
514 | |
---|
515 | ! open water = 1 if at_i=0 |
---|
516 | WHERE( at_i(:,:) == 0._wp ) ato_i(:,:) = 1._wp |
---|
517 | ! |
---|
518 | END SUBROUTINE ice_var_zapsmall |
---|
519 | |
---|
520 | |
---|
521 | SUBROUTINE ice_var_itd( zhti, zhts, zati, zh_i, zh_s, za_i ) |
---|
522 | !!------------------------------------------------------------------- |
---|
523 | !! *** ROUTINE ice_var_itd *** |
---|
524 | !! |
---|
525 | !! ** Purpose : converting 1-cat ice to multiple ice categories |
---|
526 | !! |
---|
527 | !! ice thickness distribution follows a gaussian law |
---|
528 | !! around the concentration of the most likely ice thickness |
---|
529 | !! (similar as iceistate.F90) |
---|
530 | !! |
---|
531 | !! ** Method: Iterative procedure |
---|
532 | !! |
---|
533 | !! 1) Try to fill the jpl ice categories (bounds hi_max(0:jpl)) with a gaussian |
---|
534 | !! |
---|
535 | !! 2) Check whether the distribution conserves area and volume, positivity and |
---|
536 | !! category boundaries |
---|
537 | !! |
---|
538 | !! 3) If not (input ice is too thin), the last category is empty and |
---|
539 | !! the number of categories is reduced (jpl-1) |
---|
540 | !! |
---|
541 | !! 4) Iterate until ok (SUM(itest(:) = 4) |
---|
542 | !! |
---|
543 | !! ** Arguments : zhti: 1-cat ice thickness |
---|
544 | !! zhts: 1-cat snow depth |
---|
545 | !! zati: 1-cat ice concentration |
---|
546 | !! |
---|
547 | !! ** Output : jpl-cat |
---|
548 | !! |
---|
549 | !! (Example of application: BDY forcings when input are cell averaged) |
---|
550 | !!------------------------------------------------------------------- |
---|
551 | INTEGER :: ji, jk, jl ! dummy loop indices |
---|
552 | INTEGER :: idim, i_fill, jl0 |
---|
553 | REAL(wp) :: zarg, zV, zconv, zdh, zdv |
---|
554 | REAL(wp), DIMENSION(:), INTENT(in) :: zhti, zhts, zati ! input ice/snow variables |
---|
555 | REAL(wp), DIMENSION(:,:), INTENT(inout) :: zh_i, zh_s, za_i ! output ice/snow variables |
---|
556 | INTEGER , DIMENSION(4) :: itest |
---|
557 | !!------------------------------------------------------------------- |
---|
558 | ! |
---|
559 | ! ---------------------------------------- |
---|
560 | ! distribution over the jpl ice categories |
---|
561 | ! ---------------------------------------- |
---|
562 | ! a gaussian distribution for ice concentration is used |
---|
563 | ! then we check whether the distribution fullfills |
---|
564 | ! volume and area conservation, positivity and ice categories bounds |
---|
565 | idim = SIZE( zhti , 1 ) |
---|
566 | zh_i(1:idim,1:jpl) = 0._wp |
---|
567 | zh_s(1:idim,1:jpl) = 0._wp |
---|
568 | za_i(1:idim,1:jpl) = 0._wp |
---|
569 | ! |
---|
570 | DO ji = 1, idim |
---|
571 | ! |
---|
572 | IF( zhti(ji) > 0._wp ) THEN |
---|
573 | ! |
---|
574 | ! find which category (jl0) the input ice thickness falls into |
---|
575 | jl0 = jpl |
---|
576 | DO jl = 1, jpl |
---|
577 | IF ( ( zhti(ji) >= hi_max(jl-1) ) .AND. ( zhti(ji) < hi_max(jl) ) ) THEN |
---|
578 | jl0 = jl |
---|
579 | CYCLE |
---|
580 | ENDIF |
---|
581 | END DO |
---|
582 | ! |
---|
583 | itest(:) = 0 |
---|
584 | i_fill = jpl + 1 !------------------------------------ |
---|
585 | DO WHILE ( ( SUM( itest(:) ) /= 4 ) .AND. ( i_fill >= 2 ) ) ! iterative loop on i_fill categories |
---|
586 | ! !------------------------------------ |
---|
587 | i_fill = i_fill - 1 |
---|
588 | ! |
---|
589 | zh_i(ji,1:jpl) = 0._wp |
---|
590 | za_i(ji,1:jpl) = 0._wp |
---|
591 | itest(:) = 0 |
---|
592 | ! |
---|
593 | IF ( i_fill == 1 ) THEN !-- case very thin ice: fill only category 1 |
---|
594 | zh_i(ji,1) = zhti(ji) |
---|
595 | za_i (ji,1) = zati (ji) |
---|
596 | ELSE !-- case ice is thicker: fill categories >1 |
---|
597 | ! thickness |
---|
598 | DO jl = 1, i_fill - 1 |
---|
599 | zh_i(ji,jl) = hi_mean(jl) |
---|
600 | END DO |
---|
601 | ! |
---|
602 | ! concentration |
---|
603 | za_i(ji,jl0) = zati(ji) / SQRT(REAL(jpl)) |
---|
604 | DO jl = 1, i_fill - 1 |
---|
605 | IF ( jl /= jl0 ) THEN |
---|
606 | zarg = ( zh_i(ji,jl) - zhti(ji) ) / ( zhti(ji) * 0.5_wp ) |
---|
607 | za_i(ji,jl) = za_i (ji,jl0) * EXP(-zarg**2) |
---|
608 | ENDIF |
---|
609 | END DO |
---|
610 | ! |
---|
611 | ! last category |
---|
612 | za_i(ji,i_fill) = zati(ji) - SUM( za_i(ji,1:i_fill-1) ) |
---|
613 | zV = SUM( za_i(ji,1:i_fill-1) * zh_i(ji,1:i_fill-1) ) |
---|
614 | zh_i(ji,i_fill) = ( zhti(ji) * zati(ji) - zV ) / MAX( za_i(ji,i_fill), epsi10 ) |
---|
615 | ! |
---|
616 | ! correction if concentration of upper cat is greater than lower cat |
---|
617 | ! (it should be a gaussian around jl0 but sometimes it is not) |
---|
618 | IF ( jl0 /= jpl ) THEN |
---|
619 | DO jl = jpl, jl0+1, -1 |
---|
620 | IF ( za_i(ji,jl) > za_i(ji,jl-1) ) THEN |
---|
621 | zdv = zh_i(ji,jl) * za_i(ji,jl) |
---|
622 | zh_i(ji,jl ) = 0._wp |
---|
623 | za_i (ji,jl ) = 0._wp |
---|
624 | za_i (ji,1:jl-1) = za_i(ji,1:jl-1) + zdv / MAX( REAL(jl-1) * zhti(ji), epsi10 ) |
---|
625 | END IF |
---|
626 | END DO |
---|
627 | ENDIF |
---|
628 | ! |
---|
629 | ENDIF |
---|
630 | ! |
---|
631 | ! Compatibility tests |
---|
632 | zconv = ABS( zati(ji) - SUM( za_i(ji,1:jpl) ) ) |
---|
633 | IF ( zconv < epsi06 ) itest(1) = 1 ! Test 1: area conservation |
---|
634 | ! |
---|
635 | zconv = ABS( zhti(ji)*zati(ji) - SUM( za_i(ji,1:jpl)*zh_i(ji,1:jpl) ) ) |
---|
636 | IF ( zconv < epsi06 ) itest(2) = 1 ! Test 2: volume conservation |
---|
637 | ! |
---|
638 | IF ( zh_i(ji,i_fill) >= hi_max(i_fill-1) ) itest(3) = 1 ! Test 3: thickness of the last category is in-bounds ? |
---|
639 | ! |
---|
640 | itest(4) = 1 |
---|
641 | DO jl = 1, i_fill |
---|
642 | IF ( za_i(ji,jl) < 0._wp ) itest(4) = 0 ! Test 4: positivity of ice concentrations |
---|
643 | END DO |
---|
644 | ! !---------------------------- |
---|
645 | END DO ! end iteration on categories |
---|
646 | ! !---------------------------- |
---|
647 | ENDIF |
---|
648 | END DO |
---|
649 | |
---|
650 | ! Add Snow in each category where za_i is not 0 |
---|
651 | DO jl = 1, jpl |
---|
652 | DO ji = 1, idim |
---|
653 | IF( za_i(ji,jl) > 0._wp ) THEN |
---|
654 | zh_s(ji,jl) = zh_i(ji,jl) * ( zhts(ji) / zhti(ji) ) |
---|
655 | ! In case snow load is in excess that would lead to transformation from snow to ice |
---|
656 | ! Then, transfer the snow excess into the ice (different from icethd_dh) |
---|
657 | zdh = MAX( 0._wp, ( rhosn * zh_s(ji,jl) + ( rhoic - rau0 ) * zh_i(ji,jl) ) * r1_rau0 ) |
---|
658 | ! recompute h_i, h_s avoiding out of bounds values |
---|
659 | zh_i(ji,jl) = MIN( hi_max(jl), zh_i(ji,jl) + zdh ) |
---|
660 | zh_s(ji,jl) = MAX( 0._wp, zh_s(ji,jl) - zdh * rhoic * r1_rhosn ) |
---|
661 | ENDIF |
---|
662 | END DO |
---|
663 | END DO |
---|
664 | ! |
---|
665 | END SUBROUTINE ice_var_itd |
---|
666 | |
---|
667 | |
---|
668 | SUBROUTINE ice_var_itd2( zhti, zhts, zati, zh_i, zh_s, za_i ) |
---|
669 | !!------------------------------------------------------------------- |
---|
670 | !! *** ROUTINE ice_var_itd2 *** |
---|
671 | !! |
---|
672 | !! ** Purpose : converting N-cat ice to jpl ice categories |
---|
673 | !! |
---|
674 | !! ice thickness distribution follows a gaussian law |
---|
675 | !! around the concentration of the most likely ice thickness |
---|
676 | !! (similar as iceistate.F90) |
---|
677 | !! |
---|
678 | !! ** Method: Iterative procedure |
---|
679 | !! |
---|
680 | !! 1) Fill ice cat that correspond to input thicknesses |
---|
681 | !! Find the lowest(jlmin) and highest(jlmax) cat that are filled |
---|
682 | !! |
---|
683 | !! 2) Expand the filling to the cat jlmin-1 and jlmax+1 |
---|
684 | !! by removing 25% ice area from jlmin and jlmax (resp.) |
---|
685 | !! |
---|
686 | !! 3) Expand the filling to the empty cat between jlmin and jlmax |
---|
687 | !! by a) removing 25% ice area from the lower cat (ascendant loop jlmin=>jlmax) |
---|
688 | !! b) removing 25% ice area from the higher cat (descendant loop jlmax=>jlmin) |
---|
689 | !! |
---|
690 | !! ** Arguments : zhti: N-cat ice thickness |
---|
691 | !! zhts: N-cat snow depth |
---|
692 | !! zati: N-cat ice concentration |
---|
693 | !! |
---|
694 | !! ** Output : jpl-cat |
---|
695 | !! |
---|
696 | !! (Example of application: BDY forcings when inputs have N-cat /= jpl) |
---|
697 | !!------------------------------------------------------------------- |
---|
698 | INTEGER :: ji, jl, jl1, jl2 ! dummy loop indices |
---|
699 | INTEGER :: idim, icat |
---|
700 | INTEGER, PARAMETER :: ztrans = 0.25_wp |
---|
701 | REAL(wp), DIMENSION(:,:), INTENT(in) :: zhti, zhts, zati ! input ice/snow variables |
---|
702 | REAL(wp), DIMENSION(:,:), INTENT(inout) :: zh_i, zh_s, za_i ! output ice/snow variables |
---|
703 | INTEGER , DIMENSION(:,:), ALLOCATABLE :: jlfil, jlfil2 |
---|
704 | INTEGER , DIMENSION(:) , ALLOCATABLE :: jlmax, jlmin |
---|
705 | !!------------------------------------------------------------------- |
---|
706 | ! |
---|
707 | idim = SIZE( zhti, 1 ) |
---|
708 | icat = SIZE( zhti, 2 ) |
---|
709 | ! |
---|
710 | ALLOCATE( jlfil(idim,jpl), jlfil2(idim,jpl) ) ! allocate arrays |
---|
711 | ALLOCATE( jlmin(idim), jlmax(idim) ) |
---|
712 | |
---|
713 | ! --- initialize output fields to 0 --- ! |
---|
714 | zh_i(1:idim,1:jpl) = 0._wp |
---|
715 | zh_s(1:idim,1:jpl) = 0._wp |
---|
716 | za_i(1:idim,1:jpl) = 0._wp |
---|
717 | ! |
---|
718 | ! --- fill the categories --- ! |
---|
719 | ! find where cat-input = cat-output and fill cat-output fields |
---|
720 | jlmax(:) = 0 |
---|
721 | jlmin(:) = 999 |
---|
722 | jlfil(:,:) = 0 |
---|
723 | DO jl1 = 1, jpl |
---|
724 | DO jl2 = 1, icat |
---|
725 | DO ji = 1, idim |
---|
726 | IF( hi_max(jl1-1) <= zhti(ji,jl2) .AND. hi_max(jl1) > zhti(ji,jl2) ) THEN |
---|
727 | ! fill the right category |
---|
728 | zh_i(ji,jl1) = zhti(ji,jl2) |
---|
729 | zh_s(ji,jl1) = zhts(ji,jl2) |
---|
730 | za_i(ji,jl1) = zati(ji,jl2) |
---|
731 | ! record categories that are filled |
---|
732 | jlmax(ji) = MAX( jlmax(ji), jl1 ) |
---|
733 | jlmin(ji) = MIN( jlmin(ji), jl1 ) |
---|
734 | jlfil(ji,jl1) = jl1 |
---|
735 | ENDIF |
---|
736 | END DO |
---|
737 | END DO |
---|
738 | END DO |
---|
739 | ! |
---|
740 | ! --- fill the gaps between categories --- ! |
---|
741 | ! transfer from categories filled at the previous step to the empty ones in between |
---|
742 | DO ji = 1, idim |
---|
743 | jl1 = jlmin(ji) |
---|
744 | jl2 = jlmax(ji) |
---|
745 | IF( jl1 > 1 ) THEN |
---|
746 | ! fill the lower cat (jl1-1) |
---|
747 | za_i(ji,jl1-1) = ztrans * za_i(ji,jl1) |
---|
748 | zh_i(ji,jl1-1) = hi_mean(jl1-1) |
---|
749 | ! remove from cat jl1 |
---|
750 | za_i(ji,jl1 ) = ( 1._wp - ztrans ) * za_i(ji,jl1) |
---|
751 | ENDIF |
---|
752 | IF( jl2 < jpl ) THEN |
---|
753 | ! fill the upper cat (jl2+1) |
---|
754 | za_i(ji,jl2+1) = ztrans * za_i(ji,jl2) |
---|
755 | zh_i(ji,jl2+1) = hi_mean(jl2+1) |
---|
756 | ! remove from cat jl2 |
---|
757 | za_i(ji,jl2 ) = ( 1._wp - ztrans ) * za_i(ji,jl2) |
---|
758 | ENDIF |
---|
759 | END DO |
---|
760 | ! |
---|
761 | jlfil2(:,:) = jlfil(:,:) |
---|
762 | ! fill categories from low to high |
---|
763 | DO jl = 2, jpl-1 |
---|
764 | DO ji = 1, idim |
---|
765 | IF( jlfil(ji,jl-1) /= 0 .AND. jlfil(ji,jl) == 0 ) THEN |
---|
766 | ! fill high |
---|
767 | za_i(ji,jl) = ztrans * za_i(ji,jl-1) |
---|
768 | zh_i(ji,jl) = hi_mean(jl) |
---|
769 | jlfil(ji,jl) = jl |
---|
770 | ! remove low |
---|
771 | za_i(ji,jl-1) = ( 1._wp - ztrans ) * za_i(ji,jl-1) |
---|
772 | ENDIF |
---|
773 | END DO |
---|
774 | END DO |
---|
775 | ! |
---|
776 | ! fill categories from high to low |
---|
777 | DO jl = jpl-1, 2, -1 |
---|
778 | DO ji = 1, idim |
---|
779 | IF( jlfil2(ji,jl+1) /= 0 .AND. jlfil2(ji,jl) == 0 ) THEN |
---|
780 | ! fill low |
---|
781 | za_i(ji,jl) = za_i(ji,jl) + ztrans * za_i(ji,jl+1) |
---|
782 | zh_i(ji,jl) = hi_mean(jl) |
---|
783 | jlfil2(ji,jl) = jl |
---|
784 | ! remove high |
---|
785 | za_i(ji,jl+1) = ( 1._wp - ztrans ) * za_i(ji,jl+1) |
---|
786 | ENDIF |
---|
787 | END DO |
---|
788 | END DO |
---|
789 | ! |
---|
790 | DEALLOCATE( jlfil, jlfil2 ) ! deallocate arrays |
---|
791 | DEALLOCATE( jlmin, jlmax ) |
---|
792 | ! |
---|
793 | END SUBROUTINE ice_var_itd2 |
---|
794 | |
---|
795 | |
---|
796 | SUBROUTINE ice_var_bv |
---|
797 | !!------------------------------------------------------------------- |
---|
798 | !! *** ROUTINE ice_var_bv *** |
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799 | !! |
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800 | !! ** Purpose : computes mean brine volume (%) in sea ice |
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801 | !! |
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802 | !! ** Method : e = - 0.054 * S (ppt) / T (C) |
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803 | !! |
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804 | !! References : Vancoppenolle et al., JGR, 2007 |
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805 | !!------------------------------------------------------------------- |
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806 | INTEGER :: ji, jj, jk, jl ! dummy loop indices |
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807 | !!------------------------------------------------------------------- |
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808 | ! |
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809 | !!gm I prefere to use WHERE / ELSEWHERE to set it to zero only where needed <<<=== to be done |
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810 | !! instead of setting everything to zero as just below |
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811 | bv_i (:,:,:) = 0._wp |
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812 | DO jl = 1, jpl |
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813 | DO jk = 1, nlay_i |
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814 | WHERE( t_i(:,:,jk,jl) < rt0 - epsi10 ) |
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815 | bv_i(:,:,jl) = bv_i(:,:,jl) - tmut * sz_i(:,:,jk,jl) * r1_nlay_i / ( t_i(:,:,jk,jl) - rt0 ) |
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816 | END WHERE |
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817 | END DO |
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818 | END DO |
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819 | WHERE( vt_i(:,:) > epsi20 ) ; bvm_i(:,:) = SUM( bv_i(:,:,:) * v_i(:,:,:) , dim=3 ) / vt_i(:,:) |
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820 | ELSEWHERE ; bvm_i(:,:) = 0._wp |
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821 | END WHERE |
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822 | ! |
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823 | END SUBROUTINE ice_var_bv |
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824 | |
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825 | |
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826 | SUBROUTINE ice_var_enthalpy |
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827 | !!------------------------------------------------------------------- |
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828 | !! *** ROUTINE ice_var_enthalpy *** |
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829 | !! |
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830 | !! ** Purpose : Computes sea ice energy of melting q_i (J.m-3) from temperature |
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831 | !! |
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832 | !! ** Method : Formula (Bitz and Lipscomb, 1999) |
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833 | !!------------------------------------------------------------------- |
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834 | INTEGER :: ji, jk ! dummy loop indices |
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835 | REAL(wp) :: ztmelts ! local scalar |
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836 | !!------------------------------------------------------------------- |
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837 | ! |
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838 | DO jk = 1, nlay_i ! Sea ice energy of melting |
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839 | DO ji = 1, npti |
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840 | ztmelts = - tmut * sz_i_1d(ji,jk) |
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841 | t_i_1d(ji,jk) = MIN( t_i_1d(ji,jk), ztmelts + rt0 ) ! Force t_i_1d to be lower than melting point |
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842 | ! (sometimes zdf scheme produces abnormally high temperatures) |
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843 | e_i_1d(ji,jk) = rhoic * ( cpic * ( ztmelts - ( t_i_1d(ji,jk) - rt0 ) ) & |
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844 | & + lfus * ( 1._wp - ztmelts / ( t_i_1d(ji,jk) - rt0 ) ) & |
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845 | & - rcp * ztmelts ) |
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846 | END DO |
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847 | END DO |
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848 | DO jk = 1, nlay_s ! Snow energy of melting |
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849 | DO ji = 1, npti |
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850 | e_s_1d(ji,jk) = rhosn * ( cpic * ( rt0 - t_s_1d(ji,jk) ) + lfus ) |
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851 | END DO |
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852 | END DO |
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853 | ! |
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854 | END SUBROUTINE ice_var_enthalpy |
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855 | |
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856 | #else |
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857 | !!---------------------------------------------------------------------- |
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858 | !! Default option Dummy module NO ESIM sea-ice model |
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859 | !!---------------------------------------------------------------------- |
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860 | #endif |
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861 | |
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862 | !!====================================================================== |
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863 | END MODULE icevar |
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