1 | MODULE iceitd |
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2 | !!====================================================================== |
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3 | !! *** MODULE iceitd *** |
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4 | !! sea-ice : ice thickness distribution |
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5 | !!====================================================================== |
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6 | !! History : - ! (W. H. Lipscomb and E.C. Hunke) CICE (c) original code |
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7 | !! 3.0 ! 2005-12 (M. Vancoppenolle) adaptation to LIM-3 |
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8 | !! - ! 2006-06 (M. Vancoppenolle) adaptation to include salt, age |
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9 | !! - ! 2007-04 (M. Vancoppenolle) Mass conservation checked |
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10 | !!---------------------------------------------------------------------- |
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11 | #if defined key_lim3 |
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12 | !!---------------------------------------------------------------------- |
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13 | !! 'key_lim3' ESIM sea-ice model |
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14 | !!---------------------------------------------------------------------- |
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15 | !! ice_itd_rem : redistribute ice thicknesses after thermo growth and melt |
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16 | !! itd_glinear : build g(h) satisfying area and volume constraints |
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17 | !! itd_shiftice : shift ice across category boundaries, conserving everything |
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18 | !! ice_itd_reb : rebin ice thicknesses into bounded categories |
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19 | !! ice_itd_init : read ice thicknesses mean and min from namelist |
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20 | !!---------------------------------------------------------------------- |
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21 | USE dom_oce ! ocean domain |
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22 | USE phycst ! physical constants |
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23 | USE ice1D ! sea-ice: thermodynamic variables |
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24 | USE ice ! sea-ice: variables |
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25 | USE icectl ! sea-ice: conservation tests |
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26 | USE icetab ! sea-ice: convert 1D<=>2D |
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27 | ! |
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28 | USE in_out_manager ! I/O manager |
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29 | USE lib_mpp ! MPP library |
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30 | USE lib_fortran ! fortran utilities (glob_sum + no signed zero) |
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31 | USE prtctl ! Print control |
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32 | |
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33 | IMPLICIT NONE |
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34 | PRIVATE |
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35 | |
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36 | PUBLIC ice_itd_init ! called in icestp |
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37 | PUBLIC ice_itd_rem ! called in icethd |
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38 | PUBLIC ice_itd_reb ! called in icecor |
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39 | |
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40 | INTEGER :: nice_catbnd ! choice of the type of ice category function |
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41 | ! ! associated indices: |
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42 | INTEGER, PARAMETER :: np_cathfn = 1 ! categories defined by a function |
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43 | INTEGER, PARAMETER :: np_catusr = 2 ! categories defined by the user |
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44 | ! |
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45 | ! !! ** namelist (namitd) ** |
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46 | LOGICAL :: ln_cat_hfn ! ice categories are defined by function like rn_himean**(-0.05) |
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47 | REAL(wp) :: rn_himean ! mean thickness of the domain |
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48 | LOGICAL :: ln_cat_usr ! ice categories are defined by rn_catbnd |
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49 | REAL(wp), DIMENSION(0:100) :: rn_catbnd ! ice categories bounds |
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50 | ! |
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51 | !!---------------------------------------------------------------------- |
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52 | !! NEMO/ICE 4.0 , NEMO Consortium (2017) |
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53 | !! $Id: iceitd.F90 8420 2017-08-08 12:18:46Z clem $ |
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54 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
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55 | !!---------------------------------------------------------------------- |
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56 | CONTAINS |
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57 | |
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58 | SUBROUTINE ice_itd_rem( kt ) |
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59 | !!------------------------------------------------------------------ |
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60 | !! *** ROUTINE ice_itd_rem *** |
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61 | !! |
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62 | !! ** Purpose : computes the redistribution of ice thickness |
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63 | !! after thermodynamic growth of ice thickness |
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64 | !! |
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65 | !! ** Method : Linear remapping |
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66 | !! |
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67 | !! References : W.H. Lipscomb, JGR 2001 |
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68 | !!------------------------------------------------------------------ |
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69 | INTEGER , INTENT (in) :: kt ! Ocean time step |
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70 | ! |
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71 | INTEGER :: ji, jj, jl, jcat ! dummy loop index |
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72 | INTEGER :: ipti ! local integer |
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73 | REAL(wp) :: zx1, zwk1, zdh0, zetamin, zdamax ! local scalars |
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74 | REAL(wp) :: zx2, zwk2, zda0, zetamax ! - - |
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75 | REAL(wp) :: zx3 |
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76 | REAL(wp) :: zslope ! used to compute local thermodynamic "speeds" |
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77 | ! |
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78 | INTEGER , DIMENSION(jpij) :: iptidx ! compute remapping or not |
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79 | INTEGER , DIMENSION(jpij,jpl-1) :: jdonor ! donor category index |
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80 | REAL(wp), DIMENSION(jpij,jpl) :: zdhice ! ice thickness increment |
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81 | REAL(wp), DIMENSION(jpij,jpl) :: g0, g1 ! coefficients for fitting the line of the ITD |
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82 | REAL(wp), DIMENSION(jpij,jpl) :: hL, hR ! left and right boundary for the ITD for each thickness |
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83 | REAL(wp), DIMENSION(jpij,jpl-1) :: zdaice, zdvice ! local increment of ice area and volume |
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84 | REAL(wp), DIMENSION(jpij) :: zhb0, zhb1 ! category boundaries for thinnes categories |
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85 | REAL(wp), DIMENSION(jpij,0:jpl) :: zhbnew ! new boundaries of ice categories |
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86 | !!------------------------------------------------------------------ |
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87 | |
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88 | IF( kt == nit000 .AND. lwp ) WRITE(numout,*) '-- ice_itd_rem: remapping ice thickness distribution' |
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89 | |
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90 | IF( ln_icediachk ) CALL ice_cons_hsm(0, 'iceitd_rem', rdiag_v, rdiag_s, rdiag_t, rdiag_fv, rdiag_fs, rdiag_ft) |
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91 | |
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92 | !----------------------------------------------------------------------------------------------- |
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93 | ! 1) Identify grid cells with ice |
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94 | !----------------------------------------------------------------------------------------------- |
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95 | npti = 0 ; nptidx(:) = 0 |
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96 | DO jj = 1, jpj |
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97 | DO ji = 1, jpi |
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98 | IF ( at_i(ji,jj) > epsi10 ) THEN |
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99 | npti = npti + 1 |
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100 | nptidx( npti ) = (jj - 1) * jpi + ji |
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101 | ENDIF |
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102 | END DO |
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103 | END DO |
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104 | |
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105 | !----------------------------------------------------------------------------------------------- |
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106 | ! 2) Compute new category boundaries |
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107 | !----------------------------------------------------------------------------------------------- |
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108 | IF( npti > 0 ) THEN |
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109 | ! |
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110 | zdhice(:,:) = 0._wp |
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111 | zhbnew(:,:) = 0._wp |
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112 | ! |
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113 | CALL tab_3d_2d( npti, nptidx(1:npti), h_i_2d (1:npti,1:jpl), h_i ) |
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114 | CALL tab_3d_2d( npti, nptidx(1:npti), h_ib_2d(1:npti,1:jpl), h_i_b ) |
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115 | CALL tab_3d_2d( npti, nptidx(1:npti), a_i_2d (1:npti,1:jpl), a_i ) |
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116 | CALL tab_3d_2d( npti, nptidx(1:npti), a_ib_2d (1:npti,1:jpl), a_i_b ) |
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117 | ! |
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118 | DO jl = 1, jpl |
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119 | ! Compute thickness change in each ice category |
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120 | DO ji = 1, npti |
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121 | zdhice(ji,jl) = h_i_2d(ji,jl) - h_ib_2d(ji,jl) |
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122 | END DO |
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123 | END DO |
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124 | ! |
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125 | ! --- New boundaries for category 1:jpl-1 --- ! |
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126 | DO jl = 1, jpl - 1 |
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127 | ! |
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128 | DO ji = 1, npti |
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129 | ! |
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130 | ! --- New boundary: Hn* = Hn + Fn*dt --- ! |
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131 | ! Fn*dt = ( fn + (fn+1 - fn)/(hn+1 - hn) * (Hn - hn) ) * dt = zdhice + zslope * (Hmax - h_i_b) |
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132 | ! |
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133 | IF ( a_ib_2d(ji,jl) > epsi10 .AND. a_ib_2d(ji,jl+1) > epsi10 ) THEN ! a(jl+1) & a(jl) /= 0 |
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134 | zslope = ( zdhice(ji,jl+1) - zdhice(ji,jl) ) / ( h_ib_2d(ji,jl+1) - h_ib_2d(ji,jl) ) |
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135 | zhbnew(ji,jl) = hi_max(jl) + zdhice(ji,jl) + zslope * ( hi_max(jl) - h_ib_2d(ji,jl) ) |
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136 | ELSEIF( a_ib_2d(ji,jl) > epsi10 .AND. a_ib_2d(ji,jl+1) <= epsi10 ) THEN ! a(jl+1)=0 => Hn* = Hn + fn*dt |
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137 | zhbnew(ji,jl) = hi_max(jl) + zdhice(ji,jl) |
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138 | ELSEIF( a_ib_2d(ji,jl) <= epsi10 .AND. a_ib_2d(ji,jl+1) > epsi10 ) THEN ! a(jl)=0 => Hn* = Hn + fn+1*dt |
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139 | zhbnew(ji,jl) = hi_max(jl) + zdhice(ji,jl+1) |
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140 | ELSE ! a(jl+1) & a(jl) = 0 |
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141 | zhbnew(ji,jl) = hi_max(jl) |
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142 | ENDIF |
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143 | ! |
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144 | ! --- 2 conditions for remapping --- ! |
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145 | ! 1) hn(t+1)+espi < Hn* < hn+1(t+1)-epsi |
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146 | ! Note: hn(t+1) must not be too close to either HR or HL otherwise a division by nearly 0 is possible |
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147 | ! in itd_glinear in the case (HR-HL) = 3(Hice - HL) or = 3(HR - Hice) |
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148 | IF( a_i_2d(ji,jl ) > epsi10 .AND. h_i_2d(ji,jl ) > ( zhbnew(ji,jl) - epsi10 ) ) nptidx(ji) = 0 |
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149 | IF( a_i_2d(ji,jl+1) > epsi10 .AND. h_i_2d(ji,jl+1) < ( zhbnew(ji,jl) + epsi10 ) ) nptidx(ji) = 0 |
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150 | ! |
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151 | ! 2) Hn-1 < Hn* < Hn+1 |
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152 | IF( zhbnew(ji,jl) < hi_max(jl-1) ) nptidx(ji) = 0 |
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153 | IF( zhbnew(ji,jl) > hi_max(jl+1) ) nptidx(ji) = 0 |
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154 | ! |
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155 | END DO |
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156 | END DO |
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157 | ! |
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158 | ! --- New boundaries for category jpl --- ! |
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159 | DO ji = 1, npti |
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160 | IF( a_i_2d(ji,jpl) > epsi10 ) THEN |
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161 | zhbnew(ji,jpl) = MAX( hi_max(jpl-1), 3._wp * h_i_2d(ji,jpl) - 2._wp * zhbnew(ji,jpl-1) ) |
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162 | ELSE |
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163 | zhbnew(ji,jpl) = hi_max(jpl) |
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164 | ENDIF |
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165 | ! |
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166 | ! --- 1 additional condition for remapping (1st category) --- ! |
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167 | ! H0+epsi < h1(t) < H1-epsi |
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168 | ! h1(t) must not be too close to either HR or HL otherwise a division by nearly 0 is possible |
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169 | ! in itd_glinear in the case (HR-HL) = 3(Hice - HL) or = 3(HR - Hice) |
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170 | IF( h_ib_2d(ji,1) < ( hi_max(0) + epsi10 ) ) nptidx(ji) = 0 |
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171 | IF( h_ib_2d(ji,1) > ( hi_max(1) - epsi10 ) ) nptidx(ji) = 0 |
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172 | END DO |
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173 | ! |
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174 | !----------------------------------------------------------------------------------------------- |
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175 | ! 3) Identify cells where remapping |
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176 | !----------------------------------------------------------------------------------------------- |
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177 | ipti = 0 ; iptidx(:) = 0 |
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178 | DO ji = 1, npti |
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179 | IF( nptidx(ji) /= 0 ) THEN |
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180 | ipti = ipti + 1 |
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181 | iptidx(ipti) = nptidx(ji) |
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182 | zhbnew(ipti,:) = zhbnew(ji,:) ! adjust zhbnew to new indices |
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183 | ENDIF |
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184 | END DO |
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185 | nptidx(:) = iptidx(:) |
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186 | npti = ipti |
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187 | ! |
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188 | ENDIF |
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189 | |
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190 | !----------------------------------------------------------------------------------------------- |
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191 | ! 4) Compute g(h) |
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192 | !----------------------------------------------------------------------------------------------- |
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193 | IF( npti > 0 ) THEN |
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194 | ! |
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195 | zhb0(:) = hi_max(0) ; zhb1(:) = hi_max(1) |
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196 | g0(:,:) = 0._wp ; g1(:,:) = 0._wp |
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197 | hL(:,:) = 0._wp ; hR(:,:) = 0._wp |
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198 | ! |
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199 | DO jl = 1, jpl |
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200 | ! |
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201 | CALL tab_2d_1d( npti, nptidx(1:npti), h_ib_1d(1:npti), h_i_b(:,:,jl) ) |
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202 | CALL tab_2d_1d( npti, nptidx(1:npti), h_i_1d (1:npti), h_i(:,:,jl) ) |
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203 | CALL tab_2d_1d( npti, nptidx(1:npti), a_i_1d (1:npti), a_i(:,:,jl) ) |
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204 | CALL tab_2d_1d( npti, nptidx(1:npti), v_i_1d (1:npti), v_i(:,:,jl) ) |
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205 | ! |
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206 | IF( jl == 1 ) THEN |
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207 | ! |
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208 | ! --- g(h) for category 1 --- ! |
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209 | CALL itd_glinear( zhb0(1:npti) , zhb1(1:npti) , h_ib_1d(1:npti) , a_i_1d(1:npti) , & ! in |
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210 | & g0 (1:npti,1), g1 (1:npti,1), hL (1:npti,1), hR (1:npti,1) ) ! out |
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211 | ! |
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212 | ! Area lost due to melting of thin ice |
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213 | DO ji = 1, npti |
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214 | ! |
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215 | IF( a_i_1d(ji) > epsi10 ) THEN |
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216 | ! |
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217 | zdh0 = h_i_1d(ji) - h_ib_1d(ji) |
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218 | IF( zdh0 < 0.0 ) THEN !remove area from category 1 |
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219 | zdh0 = MIN( -zdh0, hi_max(1) ) |
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220 | !Integrate g(1) from 0 to dh0 to estimate area melted |
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221 | zetamax = MIN( zdh0, hR(ji,1) ) - hL(ji,1) |
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222 | ! |
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223 | IF( zetamax > 0.0 ) THEN |
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224 | zx1 = zetamax |
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225 | zx2 = 0.5 * zetamax * zetamax |
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226 | zda0 = g1(ji,1) * zx2 + g0(ji,1) * zx1 ! ice area removed |
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227 | zdamax = a_i_1d(ji) * (1.0 - h_i_1d(ji) / h_ib_1d(ji) ) ! Constrain new thickness <= h_i |
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228 | zda0 = MIN( zda0, zdamax ) ! ice area lost due to melting |
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229 | ! of thin ice (zdamax > 0) |
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230 | ! Remove area, conserving volume |
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231 | h_i_1d(ji) = h_i_1d(ji) * a_i_1d(ji) / ( a_i_1d(ji) - zda0 ) |
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232 | a_i_1d(ji) = a_i_1d(ji) - zda0 |
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233 | v_i_1d(ji) = a_i_1d(ji) * h_i_1d(ji) ! useless ? |
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234 | ENDIF |
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235 | ! |
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236 | ELSE ! if ice accretion zdh0 > 0 |
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237 | ! zhbnew was 0, and is shifted to the right to account for thin ice growth in openwater (F0 = f1) |
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238 | zhbnew(ji,0) = MIN( zdh0, hi_max(1) ) |
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239 | ENDIF |
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240 | ! |
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241 | ENDIF |
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242 | ! |
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243 | END DO |
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244 | ! |
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245 | CALL tab_1d_2d( npti, nptidx(1:npti), h_i_1d (1:npti), h_i(:,:,jl) ) |
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246 | CALL tab_1d_2d( npti, nptidx(1:npti), a_i_1d (1:npti), a_i(:,:,jl) ) |
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247 | CALL tab_1d_2d( npti, nptidx(1:npti), v_i_1d (1:npti), v_i(:,:,jl) ) |
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248 | ! |
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249 | ENDIF ! jl=1 |
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250 | ! |
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251 | ! --- g(h) for each thickness category --- ! |
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252 | CALL itd_glinear( zhbnew(1:npti,jl-1), zhbnew(1:npti,jl), h_i_1d(1:npti) , a_i_1d(1:npti) , & ! in |
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253 | & g0 (1:npti,jl ), g1 (1:npti,jl), hL (1:npti,jl), hR (1:npti,jl) ) ! out |
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254 | ! |
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255 | END DO |
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256 | |
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257 | !----------------------------------------------------------------------------------------------- |
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258 | ! 5) Compute area and volume to be shifted across each boundary (Eq. 18) |
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259 | !----------------------------------------------------------------------------------------------- |
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260 | DO jl = 1, jpl - 1 |
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261 | ! |
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262 | DO ji = 1, npti |
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263 | ! |
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264 | ! left and right integration limits in eta space |
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265 | IF (zhbnew(ji,jl) > hi_max(jl)) THEN ! Hn* > Hn => transfer from jl to jl+1 |
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266 | zetamin = MAX( hi_max(jl) , hL(ji,jl) ) - hL(ji,jl) ! hi_max(jl) - hL |
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267 | zetamax = MIN( zhbnew(ji,jl), hR(ji,jl) ) - hL(ji,jl) ! hR - hL |
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268 | jdonor(ji,jl) = jl |
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269 | ELSE ! Hn* <= Hn => transfer from jl+1 to jl |
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270 | zetamin = 0.0 |
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271 | zetamax = MIN( hi_max(jl), hR(ji,jl+1) ) - hL(ji,jl+1) ! hi_max(jl) - hL |
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272 | jdonor(ji,jl) = jl + 1 |
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273 | ENDIF |
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274 | zetamax = MAX( zetamax, zetamin ) ! no transfer if etamax < etamin |
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275 | ! |
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276 | zx1 = zetamax - zetamin |
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277 | zwk1 = zetamin * zetamin |
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278 | zwk2 = zetamax * zetamax |
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279 | zx2 = 0.5 * ( zwk2 - zwk1 ) |
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280 | zwk1 = zwk1 * zetamin |
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281 | zwk2 = zwk2 * zetamax |
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282 | zx3 = 1.0 / 3.0 * ( zwk2 - zwk1 ) |
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283 | jcat = jdonor(ji,jl) |
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284 | zdaice(ji,jl) = g1(ji,jcat)*zx2 + g0(ji,jcat)*zx1 |
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285 | zdvice(ji,jl) = g1(ji,jcat)*zx3 + g0(ji,jcat)*zx2 + zdaice(ji,jl)*hL(ji,jcat) |
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286 | ! |
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287 | END DO |
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288 | END DO |
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289 | |
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290 | !---------------------------------------------------------------------------------------------- |
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291 | ! 6) Shift ice between categories |
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292 | !---------------------------------------------------------------------------------------------- |
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293 | CALL itd_shiftice ( jdonor(1:npti,:), zdaice(1:npti,:), zdvice(1:npti,:) ) |
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294 | |
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295 | !---------------------------------------------------------------------------------------------- |
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296 | ! 7) Make sure h_i >= minimum ice thickness hi_min |
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297 | !---------------------------------------------------------------------------------------------- |
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298 | CALL tab_2d_1d( npti, nptidx(1:npti), h_i_1d (1:npti), h_i (:,:,1) ) |
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299 | CALL tab_2d_1d( npti, nptidx(1:npti), a_i_1d (1:npti), a_i (:,:,1) ) |
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300 | CALL tab_2d_1d( npti, nptidx(1:npti), a_ip_1d(1:npti), a_ip(:,:,1) ) |
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301 | ! |
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302 | DO ji = 1, npti |
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303 | IF ( a_i_1d(ji) > epsi10 .AND. h_i_1d(ji) < rn_himin ) THEN |
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304 | a_i_1d (ji) = a_i_1d(ji) * h_i_1d(ji) / rn_himin |
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305 | IF( ln_pnd_H12 ) a_ip_1d(ji) = a_ip_1d(ji) * h_i_1d(ji) / rn_himin |
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306 | h_i_1d(ji) = rn_himin |
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307 | ENDIF |
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308 | END DO |
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309 | ! |
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310 | CALL tab_1d_2d( npti, nptidx(1:npti), h_i_1d (1:npti), h_i (:,:,1) ) |
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311 | CALL tab_1d_2d( npti, nptidx(1:npti), a_i_1d (1:npti), a_i (:,:,1) ) |
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312 | CALL tab_1d_2d( npti, nptidx(1:npti), a_ip_1d(1:npti), a_ip(:,:,1) ) |
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313 | ! |
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314 | ENDIF |
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315 | ! |
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316 | IF( ln_icediachk ) CALL ice_cons_hsm(1, 'iceitd_rem', rdiag_v, rdiag_s, rdiag_t, rdiag_fv, rdiag_fs, rdiag_ft) |
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317 | ! |
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318 | END SUBROUTINE ice_itd_rem |
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319 | |
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320 | |
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321 | SUBROUTINE itd_glinear( HbL, Hbr, phice, paice, pg0, pg1, phL, phR ) |
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322 | !!------------------------------------------------------------------ |
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323 | !! *** ROUTINE itd_glinear *** |
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324 | !! |
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325 | !! ** Purpose : build g(h) satisfying area and volume constraints (Eq. 6 and 9) |
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326 | !! |
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327 | !! ** Method : g(h) is linear and written as: g(eta) = g1(eta) + g0 |
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328 | !! with eta = h - HL |
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329 | !!------------------------------------------------------------------ |
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330 | REAL(wp), DIMENSION(:), INTENT(in ) :: HbL, HbR ! left and right category boundaries |
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331 | REAL(wp), DIMENSION(:), INTENT(in ) :: phice, paice ! ice thickness and concentration |
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332 | REAL(wp), DIMENSION(:), INTENT(inout) :: pg0, pg1 ! coefficients in linear equation for g(eta) |
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333 | REAL(wp), DIMENSION(:), INTENT(inout) :: phL, phR ! min and max value of range over which g(h) > 0 |
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334 | ! |
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335 | INTEGER :: ji ! horizontal indices |
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336 | REAL(wp) :: z1_3 , z2_3 ! 1/3 , 2/3 |
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337 | REAL(wp) :: zh13 ! HbL + 1/3 * (HbR - HbL) |
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338 | REAL(wp) :: zh23 ! HbL + 2/3 * (HbR - HbL) |
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339 | REAL(wp) :: zdhr ! 1 / (hR - hL) |
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340 | REAL(wp) :: zwk1, zwk2 ! temporary variables |
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341 | !!------------------------------------------------------------------ |
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342 | ! |
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343 | z1_3 = 1._wp / 3._wp |
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344 | z2_3 = 2._wp / 3._wp |
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345 | ! |
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346 | DO ji = 1, npti |
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347 | ! |
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348 | IF( paice(ji) > epsi10 .AND. phice(ji) > 0._wp ) THEN |
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349 | ! |
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350 | ! Initialize hL and hR |
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351 | phL(ji) = HbL(ji) |
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352 | phR(ji) = HbR(ji) |
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353 | ! |
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354 | ! Change hL or hR if hice falls outside central third of range, |
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355 | ! so that hice is in the central third of the range [HL HR] |
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356 | zh13 = z1_3 * ( 2._wp * phL(ji) + phR(ji) ) |
---|
357 | zh23 = z1_3 * ( phL(ji) + 2._wp * phR(ji) ) |
---|
358 | ! |
---|
359 | IF ( phice(ji) < zh13 ) THEN ; phR(ji) = 3._wp * phice(ji) - 2._wp * phL(ji) ! move HR to the left |
---|
360 | ELSEIF( phice(ji) > zh23 ) THEN ; phL(ji) = 3._wp * phice(ji) - 2._wp * phR(ji) ! move HL to the right |
---|
361 | ENDIF |
---|
362 | ! |
---|
363 | ! Compute coefficients of g(eta) = g0 + g1*eta |
---|
364 | zdhr = 1._wp / (phR(ji) - phL(ji)) |
---|
365 | zwk1 = 6._wp * paice(ji) * zdhr |
---|
366 | zwk2 = ( phice(ji) - phL(ji) ) * zdhr |
---|
367 | pg0(ji) = zwk1 * ( z2_3 - zwk2 ) ! Eq. 14 |
---|
368 | pg1(ji) = 2._wp * zdhr * zwk1 * ( zwk2 - 0.5_wp ) ! Eq. 14 |
---|
369 | ! |
---|
370 | ELSE ! remap_flag = .false. or a_i < epsi10 |
---|
371 | phL(ji) = 0._wp |
---|
372 | phR(ji) = 0._wp |
---|
373 | pg0(ji) = 0._wp |
---|
374 | pg1(ji) = 0._wp |
---|
375 | ENDIF |
---|
376 | ! |
---|
377 | END DO |
---|
378 | ! |
---|
379 | END SUBROUTINE itd_glinear |
---|
380 | |
---|
381 | |
---|
382 | SUBROUTINE itd_shiftice( kdonor, pdaice, pdvice ) |
---|
383 | !!------------------------------------------------------------------ |
---|
384 | !! *** ROUTINE itd_shiftice *** |
---|
385 | !! |
---|
386 | !! ** Purpose : shift ice across category boundaries, conserving everything |
---|
387 | !! ( area, volume, energy, age*vol, and mass of salt ) |
---|
388 | !!------------------------------------------------------------------ |
---|
389 | INTEGER , DIMENSION(:,:), INTENT(in) :: kdonor ! donor category index |
---|
390 | REAL(wp), DIMENSION(:,:), INTENT(in) :: pdaice ! ice area transferred across boundary |
---|
391 | REAL(wp), DIMENSION(:,:), INTENT(in) :: pdvice ! ice volume transferred across boundary |
---|
392 | ! |
---|
393 | INTEGER :: ji, jj, jl, jk ! dummy loop indices |
---|
394 | INTEGER :: ii, ij, jl2, jl1 ! local integers |
---|
395 | REAL(wp) :: ztrans ! ice/snow transferred |
---|
396 | REAL(wp), DIMENSION(jpij) :: zworka, zworkv ! workspace |
---|
397 | REAL(wp), DIMENSION(jpij,jpl) :: zaTsfn ! - - |
---|
398 | !!------------------------------------------------------------------ |
---|
399 | |
---|
400 | CALL tab_3d_2d( npti, nptidx(1:npti), h_i_2d (1:npti,1:jpl), h_i ) |
---|
401 | CALL tab_3d_2d( npti, nptidx(1:npti), a_i_2d (1:npti,1:jpl), a_i ) |
---|
402 | CALL tab_3d_2d( npti, nptidx(1:npti), v_i_2d (1:npti,1:jpl), v_i ) |
---|
403 | CALL tab_3d_2d( npti, nptidx(1:npti), v_s_2d (1:npti,1:jpl), v_s ) |
---|
404 | CALL tab_3d_2d( npti, nptidx(1:npti), oa_i_2d(1:npti,1:jpl), oa_i ) |
---|
405 | CALL tab_3d_2d( npti, nptidx(1:npti), sv_i_2d(1:npti,1:jpl), sv_i ) |
---|
406 | CALL tab_3d_2d( npti, nptidx(1:npti), a_ip_2d(1:npti,1:jpl), a_ip ) |
---|
407 | CALL tab_3d_2d( npti, nptidx(1:npti), v_ip_2d(1:npti,1:jpl), v_ip ) |
---|
408 | CALL tab_3d_2d( npti, nptidx(1:npti), t_su_2d(1:npti,1:jpl), t_su ) |
---|
409 | |
---|
410 | !---------------------------------------------------------------------------------------------- |
---|
411 | ! 1) Define a variable equal to a_i*T_su |
---|
412 | !---------------------------------------------------------------------------------------------- |
---|
413 | DO jl = 1, jpl |
---|
414 | DO ji = 1, npti |
---|
415 | zaTsfn(ji,jl) = a_i_2d(ji,jl) * t_su_2d(ji,jl) |
---|
416 | END DO |
---|
417 | END DO |
---|
418 | |
---|
419 | !------------------------------------------------------------------------------- |
---|
420 | ! 2) Transfer volume and energy between categories |
---|
421 | !------------------------------------------------------------------------------- |
---|
422 | DO jl = 1, jpl - 1 |
---|
423 | DO ji = 1, npti |
---|
424 | ! |
---|
425 | jl1 = kdonor(ji,jl) |
---|
426 | ! |
---|
427 | IF( jl1 > 0 ) THEN |
---|
428 | ! |
---|
429 | IF ( jl1 == jl ) THEN ; jl2 = jl1+1 |
---|
430 | ELSE ; jl2 = jl |
---|
431 | ENDIF |
---|
432 | ! |
---|
433 | IF( v_i_2d(ji,jl1) >= epsi10 ) THEN ; zworkv(ji) = pdvice(ji,jl) / v_i_2d(ji,jl1) |
---|
434 | ELSE ; zworkv(ji) = 0._wp |
---|
435 | ENDIF |
---|
436 | IF( a_i_2d(ji,jl1) >= epsi10 ) THEN ; zworka(ji) = pdaice(ji,jl) / a_i_2d(ji,jl1) |
---|
437 | ELSE ; zworka(ji) = 0._wp |
---|
438 | ENDIF |
---|
439 | ! |
---|
440 | a_i_2d(ji,jl1) = a_i_2d(ji,jl1) - pdaice(ji,jl) ! Ice areas |
---|
441 | a_i_2d(ji,jl2) = a_i_2d(ji,jl2) + pdaice(ji,jl) |
---|
442 | ! |
---|
443 | v_i_2d(ji,jl1) = v_i_2d(ji,jl1) - pdvice(ji,jl) ! Ice volumes |
---|
444 | v_i_2d(ji,jl2) = v_i_2d(ji,jl2) + pdvice(ji,jl) |
---|
445 | ! |
---|
446 | ztrans = v_s_2d(ji,jl1) * zworkv(ji) ! Snow volumes |
---|
447 | v_s_2d(ji,jl1) = v_s_2d(ji,jl1) - ztrans |
---|
448 | v_s_2d(ji,jl2) = v_s_2d(ji,jl2) + ztrans |
---|
449 | ! |
---|
450 | ! ! Ice age |
---|
451 | ztrans = oa_i_2d(ji,jl1) * pdaice(ji,jl) !!clem: should be * zworka(ji) but it does not work ???? |
---|
452 | oa_i_2d(ji,jl1) = oa_i_2d(ji,jl1) - ztrans |
---|
453 | oa_i_2d(ji,jl2) = oa_i_2d(ji,jl2) + ztrans |
---|
454 | ! |
---|
455 | ztrans = sv_i_2d(ji,jl1) * zworkv(ji) ! Ice salinity |
---|
456 | ! |
---|
457 | sv_i_2d(ji,jl1) = sv_i_2d(ji,jl1) - ztrans |
---|
458 | sv_i_2d(ji,jl2) = sv_i_2d(ji,jl2) + ztrans |
---|
459 | ! |
---|
460 | ! ! Surface temperature |
---|
461 | ztrans = t_su_2d(ji,jl1) * pdaice(ji,jl) !!clem: should be * zworka(ji) but it does not work ???? |
---|
462 | zaTsfn(ji,jl1) = zaTsfn(ji,jl1) - ztrans |
---|
463 | zaTsfn(ji,jl2) = zaTsfn(ji,jl2) + ztrans |
---|
464 | ! |
---|
465 | IF ( ln_pnd_H12 ) THEN |
---|
466 | ! ! Pond fraction |
---|
467 | ztrans = a_ip_2d(ji,jl1) * pdaice(ji,jl) !!clem: should be * zworka(ji) but it does not work |
---|
468 | a_ip_2d(ji,jl1) = a_ip_2d(ji,jl1) - ztrans |
---|
469 | a_ip_2d(ji,jl2) = a_ip_2d(ji,jl2) + ztrans |
---|
470 | ! ! Pond volume (also proportional to da/a) |
---|
471 | ztrans = v_ip_2d(ji,jl1) * pdaice(ji,jl) !!clem: should be * zworka(ji) but it does not work |
---|
472 | v_ip_2d(ji,jl1) = v_ip_2d(ji,jl1) - ztrans |
---|
473 | v_ip_2d(ji,jl2) = v_ip_2d(ji,jl2) + ztrans |
---|
474 | ENDIF |
---|
475 | ! |
---|
476 | ENDIF ! jl1 >0 |
---|
477 | END DO |
---|
478 | ! |
---|
479 | DO jk = 1, nlay_s !--- Snow heat content |
---|
480 | ! |
---|
481 | DO ji = 1, npti |
---|
482 | ii = MOD( nptidx(ji) - 1, jpi ) + 1 |
---|
483 | ij = ( nptidx(ji) - 1 ) / jpi + 1 |
---|
484 | ! |
---|
485 | jl1 = kdonor(ji,jl) |
---|
486 | ! |
---|
487 | IF( jl1 > 0 ) THEN |
---|
488 | IF(jl1 == jl) THEN ; jl2 = jl+1 |
---|
489 | ELSE ; jl2 = jl |
---|
490 | ENDIF |
---|
491 | ! |
---|
492 | ztrans = e_s(ii,ij,jk,jl1) * zworkv(ji) |
---|
493 | e_s(ii,ij,jk,jl1) = e_s(ii,ij,jk,jl1) - ztrans |
---|
494 | e_s(ii,ij,jk,jl2) = e_s(ii,ij,jk,jl2) + ztrans |
---|
495 | ENDIF |
---|
496 | END DO |
---|
497 | END DO |
---|
498 | ! |
---|
499 | DO jk = 1, nlay_i !--- Ice heat content |
---|
500 | DO ji = 1, npti |
---|
501 | ii = MOD( nptidx(ji) - 1, jpi ) + 1 |
---|
502 | ij = ( nptidx(ji) - 1 ) / jpi + 1 |
---|
503 | ! |
---|
504 | jl1 = kdonor(ji,jl) |
---|
505 | ! |
---|
506 | IF( jl1 > 0 ) THEN |
---|
507 | IF(jl1 == jl) THEN ; jl2 = jl+1 |
---|
508 | ELSE ; jl2 = jl |
---|
509 | ENDIF |
---|
510 | ! |
---|
511 | ztrans = e_i(ii,ij,jk,jl1) * zworkv(ji) |
---|
512 | e_i(ii,ij,jk,jl1) = e_i(ii,ij,jk,jl1) - ztrans |
---|
513 | e_i(ii,ij,jk,jl2) = e_i(ii,ij,jk,jl2) + ztrans |
---|
514 | ENDIF |
---|
515 | END DO |
---|
516 | END DO |
---|
517 | ! |
---|
518 | END DO ! boundaries, 1 to jpl-1 |
---|
519 | |
---|
520 | !------------------------------------------------------------------------------- |
---|
521 | ! 3) Update ice thickness and temperature |
---|
522 | !------------------------------------------------------------------------------- |
---|
523 | WHERE( a_i_2d(1:npti,:) >= epsi20 ) |
---|
524 | h_i_2d(1:npti,:) = v_i_2d(1:npti,:) / a_i_2d(1:npti,:) |
---|
525 | t_su_2d(1:npti,:) = zaTsfn(1:npti,:) / a_i_2d(1:npti,:) |
---|
526 | ELSEWHERE |
---|
527 | h_i_2d(1:npti,:) = 0._wp |
---|
528 | t_su_2d(1:npti,:) = rt0 |
---|
529 | END WHERE |
---|
530 | ! |
---|
531 | CALL tab_2d_3d( npti, nptidx(1:npti), h_i_2d (1:npti,1:jpl), h_i ) |
---|
532 | CALL tab_2d_3d( npti, nptidx(1:npti), a_i_2d (1:npti,1:jpl), a_i ) |
---|
533 | CALL tab_2d_3d( npti, nptidx(1:npti), v_i_2d (1:npti,1:jpl), v_i ) |
---|
534 | CALL tab_2d_3d( npti, nptidx(1:npti), v_s_2d (1:npti,1:jpl), v_s ) |
---|
535 | CALL tab_2d_3d( npti, nptidx(1:npti), oa_i_2d(1:npti,1:jpl), oa_i ) |
---|
536 | CALL tab_2d_3d( npti, nptidx(1:npti), sv_i_2d(1:npti,1:jpl), sv_i ) |
---|
537 | CALL tab_2d_3d( npti, nptidx(1:npti), a_ip_2d(1:npti,1:jpl), a_ip ) |
---|
538 | CALL tab_2d_3d( npti, nptidx(1:npti), v_ip_2d(1:npti,1:jpl), v_ip ) |
---|
539 | CALL tab_2d_3d( npti, nptidx(1:npti), t_su_2d(1:npti,1:jpl), t_su ) |
---|
540 | ! |
---|
541 | END SUBROUTINE itd_shiftice |
---|
542 | |
---|
543 | |
---|
544 | SUBROUTINE ice_itd_reb( kt ) |
---|
545 | !!------------------------------------------------------------------ |
---|
546 | !! *** ROUTINE ice_itd_reb *** |
---|
547 | !! |
---|
548 | !! ** Purpose : rebin - rebins thicknesses into defined categories |
---|
549 | !! |
---|
550 | !! ** Method : If a category thickness is out of bounds, shift part (for down to top) |
---|
551 | !! or entire (for top to down) area, volume, and energy |
---|
552 | !! to the neighboring category |
---|
553 | !!------------------------------------------------------------------ |
---|
554 | INTEGER , INTENT (in) :: kt ! Ocean time step |
---|
555 | INTEGER :: ji, jj, jl ! dummy loop indices |
---|
556 | ! |
---|
557 | INTEGER , DIMENSION(jpij,jpl-1) :: jdonor ! donor category index |
---|
558 | REAL(wp), DIMENSION(jpij,jpl-1) :: zdaice, zdvice ! ice area and volume transferred |
---|
559 | !!------------------------------------------------------------------ |
---|
560 | ! |
---|
561 | IF( kt == nit000 .AND. lwp ) WRITE(numout,*) '-- ice_itd_reb: rebining ice thickness distribution' |
---|
562 | ! |
---|
563 | jdonor(:,:) = 0 |
---|
564 | zdaice(:,:) = 0._wp |
---|
565 | zdvice(:,:) = 0._wp |
---|
566 | ! |
---|
567 | ! !--------------------------------------- |
---|
568 | DO jl = 1, jpl-1 ! identify thicknesses that are too big |
---|
569 | ! !--------------------------------------- |
---|
570 | npti = 0 ; nptidx(:) = 0 |
---|
571 | DO jj = 1, jpj |
---|
572 | DO ji = 1, jpi |
---|
573 | IF( a_i(ji,jj,jl) > epsi10 .AND. v_i(ji,jj,jl) > (a_i(ji,jj,jl) * hi_max(jl)) ) THEN |
---|
574 | npti = npti + 1 |
---|
575 | nptidx( npti ) = (jj - 1) * jpi + ji |
---|
576 | ENDIF |
---|
577 | END DO |
---|
578 | END DO |
---|
579 | ! |
---|
580 | !!clem CALL tab_2d_1d( npti, nptidx(1:npti), h_i_1d (1:npti), h_i(:,:,jl) ) |
---|
581 | CALL tab_2d_1d( npti, nptidx(1:npti), a_i_1d (1:npti), a_i(:,:,jl) ) |
---|
582 | CALL tab_2d_1d( npti, nptidx(1:npti), v_i_1d (1:npti), v_i(:,:,jl) ) |
---|
583 | ! |
---|
584 | DO ji = 1, npti |
---|
585 | jdonor(ji,jl) = jl |
---|
586 | ! how much of a_i you send in cat sup is somewhat arbitrary |
---|
587 | !!clem: these do not work properly after a restart (I do not know why) |
---|
588 | !! zdaice(ji,jl) = a_i_1d(ji) * ( h_i_1d(ji) - hi_max(jl) + epsi10 ) / h_i_1d(ji) |
---|
589 | !! zdvice(ji,jl) = v_i_1d(ji) - ( a_i_1d(ji) - zdaice(ji,jl) ) * ( hi_max(jl) - epsi10 ) |
---|
590 | !!clem: these do not work properly after a restart (I do not know why) |
---|
591 | !! zdaice(ji,jl) = a_i_1d(ji) |
---|
592 | !! zdvice(ji,jl) = v_i_1d(ji) |
---|
593 | !!clem: these are from UCL and work ok |
---|
594 | zdaice(ji,jl) = a_i_1d(ji) * 0.5_wp |
---|
595 | zdvice(ji,jl) = v_i_1d(ji) - zdaice(ji,jl) * ( hi_max(jl) + hi_max(jl-1) ) * 0.5_wp |
---|
596 | END DO |
---|
597 | ! |
---|
598 | IF( npti > 0 ) THEN |
---|
599 | CALL itd_shiftice( jdonor(1:npti,:), zdaice(1:npti,:), zdvice(1:npti,:) ) ! Shift jl=>jl+1 |
---|
600 | ! Reset shift parameters |
---|
601 | jdonor(1:npti,jl) = 0 |
---|
602 | zdaice(1:npti,jl) = 0._wp |
---|
603 | zdvice(1:npti,jl) = 0._wp |
---|
604 | ENDIF |
---|
605 | ! |
---|
606 | END DO |
---|
607 | |
---|
608 | ! !----------------------------------------- |
---|
609 | DO jl = jpl-1, 1, -1 ! Identify thicknesses that are too small |
---|
610 | ! !----------------------------------------- |
---|
611 | npti = 0 ; nptidx(:) = 0 |
---|
612 | DO jj = 1, jpj |
---|
613 | DO ji = 1, jpi |
---|
614 | IF( a_i(ji,jj,jl+1) > epsi10 .AND. v_i(ji,jj,jl+1) <= (a_i(ji,jj,jl+1) * hi_max(jl)) ) THEN |
---|
615 | npti = npti + 1 |
---|
616 | nptidx( npti ) = (jj - 1) * jpi + ji |
---|
617 | ENDIF |
---|
618 | END DO |
---|
619 | END DO |
---|
620 | ! |
---|
621 | CALL tab_2d_1d( npti, nptidx(1:npti), a_i_1d (1:npti), a_i(:,:,jl+1) ) ! jl+1 is ok |
---|
622 | CALL tab_2d_1d( npti, nptidx(1:npti), v_i_1d (1:npti), v_i(:,:,jl+1) ) ! jl+1 is ok |
---|
623 | DO ji = 1, npti |
---|
624 | jdonor(ji,jl) = jl + 1 |
---|
625 | zdaice(ji,jl) = a_i_1d(ji) |
---|
626 | zdvice(ji,jl) = v_i_1d(ji) |
---|
627 | END DO |
---|
628 | ! |
---|
629 | IF( npti > 0 ) THEN |
---|
630 | CALL itd_shiftice( jdonor(1:npti,:), zdaice(1:npti,:), zdvice(1:npti,:) ) ! Shift jl+1=>jl |
---|
631 | ! Reset shift parameters |
---|
632 | jdonor(1:npti,jl) = 0 |
---|
633 | zdaice(1:npti,jl) = 0._wp |
---|
634 | zdvice(1:npti,jl) = 0._wp |
---|
635 | ENDIF |
---|
636 | ! |
---|
637 | END DO |
---|
638 | ! |
---|
639 | END SUBROUTINE ice_itd_reb |
---|
640 | |
---|
641 | |
---|
642 | SUBROUTINE ice_itd_init |
---|
643 | !!------------------------------------------------------------------ |
---|
644 | !! *** ROUTINE ice_itd_init *** |
---|
645 | !! |
---|
646 | !! ** Purpose : Initializes the ice thickness distribution |
---|
647 | !! ** Method : ... |
---|
648 | !! ** input : Namelist namitd |
---|
649 | !!------------------------------------------------------------------- |
---|
650 | INTEGER :: jl ! dummy loop index |
---|
651 | INTEGER :: ios, ioptio ! Local integer output status for namelist read |
---|
652 | REAL(wp) :: zhmax, znum, zden, zalpha ! - - |
---|
653 | ! |
---|
654 | NAMELIST/namitd/ ln_cat_hfn, rn_himean, ln_cat_usr, rn_catbnd, rn_himin |
---|
655 | !!------------------------------------------------------------------ |
---|
656 | ! |
---|
657 | REWIND( numnam_ice_ref ) ! Namelist namitd in reference namelist : Parameters for ice |
---|
658 | READ ( numnam_ice_ref, namitd, IOSTAT = ios, ERR = 901) |
---|
659 | 901 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namitd in reference namelist', lwp ) |
---|
660 | ! |
---|
661 | REWIND( numnam_ice_cfg ) ! Namelist namitd in configuration namelist : Parameters for ice |
---|
662 | READ ( numnam_ice_cfg, namitd, IOSTAT = ios, ERR = 902 ) |
---|
663 | 902 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namitd in configuration namelist', lwp ) |
---|
664 | IF(lwm) WRITE ( numoni, namitd ) |
---|
665 | ! |
---|
666 | IF(lwp) THEN ! control print |
---|
667 | WRITE(numout,*) |
---|
668 | WRITE(numout,*) 'ice_itd_init: Initialization of ice cat distribution ' |
---|
669 | WRITE(numout,*) '~~~~~~~~~~~~' |
---|
670 | WRITE(numout,*) ' Namelist namitd: ' |
---|
671 | WRITE(numout,*) ' Ice categories are defined by a function of rn_himean**(-0.05) ln_cat_hfn = ', ln_cat_hfn |
---|
672 | WRITE(numout,*) ' mean ice thickness in the domain rn_himean = ', rn_himean |
---|
673 | WRITE(numout,*) ' Ice categories are defined by rn_catbnd ln_cat_usr = ', ln_cat_usr |
---|
674 | WRITE(numout,*) ' minimum ice thickness rn_himin = ', rn_himin |
---|
675 | ENDIF |
---|
676 | ! |
---|
677 | !-----------------------------------! |
---|
678 | ! Thickness categories boundaries ! |
---|
679 | !-----------------------------------! |
---|
680 | ! !== set the choice of ice categories ==! |
---|
681 | ioptio = 0 |
---|
682 | IF( ln_cat_hfn ) THEN ; ioptio = ioptio + 1 ; nice_catbnd = np_cathfn ; ENDIF |
---|
683 | IF( ln_cat_usr ) THEN ; ioptio = ioptio + 1 ; nice_catbnd = np_catusr ; ENDIF |
---|
684 | IF( ioptio /= 1 ) CALL ctl_stop( 'ice_itd_init: choose one and only one ice categories boundaries' ) |
---|
685 | ! |
---|
686 | SELECT CASE( nice_catbnd ) |
---|
687 | ! !------------------------! |
---|
688 | CASE( np_cathfn ) ! h^(-alpha) function |
---|
689 | ! !------------------------! |
---|
690 | zalpha = 0.05_wp |
---|
691 | zhmax = 3._wp * rn_himean |
---|
692 | hi_max(0) = 0._wp |
---|
693 | DO jl = 1, jpl |
---|
694 | znum = jpl * ( zhmax+1 )**zalpha |
---|
695 | zden = REAL( jpl-jl , wp ) * ( zhmax + 1._wp )**zalpha + REAL( jl , wp ) |
---|
696 | hi_max(jl) = ( znum / zden )**(1./zalpha) - 1 |
---|
697 | END DO |
---|
698 | ! !------------------------! |
---|
699 | CASE( np_catusr ) ! user defined |
---|
700 | ! !------------------------! |
---|
701 | DO jl = 0, jpl |
---|
702 | hi_max(jl) = rn_catbnd(jl) |
---|
703 | END DO |
---|
704 | ! |
---|
705 | END SELECT |
---|
706 | ! |
---|
707 | DO jl = 1, jpl ! mean thickness by category |
---|
708 | hi_mean(jl) = ( hi_max(jl) + hi_max(jl-1) ) * 0.5_wp |
---|
709 | END DO |
---|
710 | ! |
---|
711 | hi_max(jpl) = 99._wp ! set to a big value to ensure that all ice is thinner than hi_max(jpl) |
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712 | ! |
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713 | IF(lwp) WRITE(numout,*) |
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714 | IF(lwp) WRITE(numout,*) ' ===>>> resulting thickness category boundaries :' |
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715 | IF(lwp) WRITE(numout,*) ' hi_max(:)= ', hi_max(0:jpl) |
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716 | ! |
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717 | END SUBROUTINE ice_itd_init |
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718 | |
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719 | #else |
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720 | !!---------------------------------------------------------------------- |
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721 | !! Default option : Empty module NO ESIM sea-ice model |
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722 | !!---------------------------------------------------------------------- |
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723 | #endif |
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724 | |
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725 | !!====================================================================== |
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726 | END MODULE iceitd |
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