1 | MODULE iceadv |
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2 | !!====================================================================== |
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3 | !! *** MODULE iceadv *** |
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4 | !! LIM transport ice model : sea-ice advection/diffusion |
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5 | !!====================================================================== |
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6 | !! History : LIM-2 ! 2000-01 (M.A. Morales Maqueda, H. Goosse, and T. Fichefet) Original code |
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7 | !! 3.0 ! 2005-11 (M. Vancoppenolle) Multi-layer sea ice, salinity variations |
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8 | !! 4.0 ! 2011-02 (G. Madec) dynamical allocation |
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9 | !!---------------------------------------------------------------------- |
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10 | #if defined key_lim3 |
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11 | !!---------------------------------------------------------------------- |
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12 | !! 'key_lim3' LIM3 sea-ice model |
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13 | !!---------------------------------------------------------------------- |
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14 | !! ice_adv : advection/diffusion process of sea ice |
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15 | !!---------------------------------------------------------------------- |
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16 | USE phycst ! physical constant |
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17 | USE dom_oce ! ocean domain |
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18 | USE sbc_oce , ONLY : nn_fsbc ! frequency of sea-ice call |
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19 | USE ice ! sea-ice: variables |
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20 | USE icevar ! sea-ice: operations |
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21 | USE iceadv_prather ! sea-ice: advection scheme (Prather) |
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22 | USE iceadv_umx ! sea-ice: advection scheme (ultimate-macho) |
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23 | USE icectl ! sea-ice: control prints |
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24 | ! |
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25 | USE in_out_manager ! I/O manager |
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26 | USE lbclnk ! lateral boundary conditions -- MPP exchanges |
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27 | USE lib_mpp ! MPP library |
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28 | USE prtctl ! Print control |
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29 | USE lib_fortran ! Fortran utilities (allows no signed zero when 'key_nosignedzero' defined) |
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30 | USE timing ! Timing |
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31 | USE iom ! |
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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_adv ! called by icestp |
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37 | |
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38 | !! * Substitution |
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39 | # include "vectopt_loop_substitute.h90" |
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40 | !!---------------------------------------------------------------------- |
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41 | !! NEMO/ICE 4.0 , NEMO Consortium (2017) |
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42 | !! $Id: iceadv.F90 8373 2017-07-25 17:44:54Z clem $ |
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43 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
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44 | !!---------------------------------------------------------------------- |
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45 | CONTAINS |
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46 | |
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47 | SUBROUTINE ice_adv( kt ) |
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48 | !!---------------------------------------------------------------------- |
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49 | !! *** ROUTINE ice_adv *** |
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50 | !! |
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51 | !! ** purpose : advection of sea ice |
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52 | !! |
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53 | !! ** method : variables included in the process are scalar, |
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54 | !! other values are considered as second order. |
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55 | !! For advection, one can choose between |
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56 | !! a) an Ultimate-Macho scheme (whose order is defined by nn_limadv_ord) => nn_limadv=0 |
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57 | !! b) and a second order Prather scheme => nn_limadv=-1 |
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58 | !! |
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59 | !! ** action : |
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60 | !!---------------------------------------------------------------------- |
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61 | INTEGER, INTENT(in) :: kt ! number of iteration |
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62 | ! |
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63 | INTEGER :: ji, jj, jk, jl, jt ! dummy loop indices |
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64 | INTEGER :: initad ! number of sub-timestep for the advection |
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65 | REAL(wp) :: zcfl , zusnit ! - - |
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66 | CHARACTER(len=80) :: cltmp |
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67 | ! |
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68 | REAL(wp) :: zvi_b, zsmv_b, zei_b, zfs_b, zfw_b, zft_b |
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69 | REAL(wp) :: zdv |
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70 | REAL(wp), DIMENSION(jpi,jpj) :: zatold, zeiold, zesold, zsmvold |
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71 | REAL(wp), DIMENSION(jpi,jpj,jpl) :: zhimax, zviold, zvsold |
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72 | !!--------------------------------------------------------------------- |
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73 | IF( nn_timing == 1 ) CALL timing_start('iceadv') |
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74 | |
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75 | IF( kt == nit000 .AND. lwp ) THEN |
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76 | WRITE(numout,*) |
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77 | WRITE(numout,*) 'iceadv: sea-ice advection' |
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78 | WRITE(numout,*) '~~~~~~' |
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79 | ENDIF |
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80 | |
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81 | CALL ice_var_agg( 1 ) ! integrated values + ato_i |
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82 | |
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83 | ! conservation test |
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84 | IF( ln_limdiachk ) CALL ice_cons_hsm(0, 'iceadv', zvi_b, zsmv_b, zei_b, zfw_b, zfs_b, zft_b) |
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85 | |
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86 | ! store old values for diag |
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87 | zviold (:,:,:) = v_i(:,:,:) |
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88 | zvsold (:,:,:) = v_s(:,:,:) |
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89 | zsmvold(:,:) = SUM( smv_i(:,:,:), dim=3 ) |
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90 | zeiold (:,:) = et_i(:,:) |
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91 | zesold (:,:) = et_s(:,:) |
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92 | |
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93 | ! Thickness correction init. |
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94 | zatold(:,:) = at_i |
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95 | WHERE( a_i(:,:,:) >= epsi20 ) |
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96 | ht_i(:,:,:) = v_i(:,:,:) / a_i(:,:,:) |
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97 | ht_s(:,:,:) = v_s(:,:,:) / a_i(:,:,:) |
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98 | ELSEWHERE |
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99 | ht_i(:,:,:) = 0._wp |
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100 | ht_s(:,:,:) = 0._wp |
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101 | END WHERE |
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102 | |
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103 | ! Record max of the surrounding ice thicknesses for correction in case advection creates ice too thick |
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104 | zhimax(:,:,:) = ht_i(:,:,:) + ht_s(:,:,:) |
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105 | DO jl = 1, jpl |
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106 | DO jj = 2, jpjm1 |
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107 | DO ji = 2, jpim1 |
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108 | !!gm use of MAXVAL here is very probably less efficient than expending the 9 values |
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109 | zhimax(ji,jj,jl) = MAX( epsi20, MAXVAL( ht_i(ji-1:ji+1,jj-1:jj+1,jl) + ht_s(ji-1:ji+1,jj-1:jj+1,jl) ) ) |
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110 | END DO |
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111 | END DO |
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112 | END DO |
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113 | CALL lbc_lnk( zhimax(:,:,:), 'T', 1. ) |
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114 | |
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115 | !---------- |
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116 | ! Advection |
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117 | !---------- |
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118 | SELECT CASE ( nn_limadv ) |
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119 | CASE ( 0 ) !-- ULTIMATE-MACHO scheme |
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120 | CALL ice_adv_umx( kt, u_ice, v_ice, & |
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121 | & ato_i, v_i, v_s, smv_i, oa_i, a_i, a_ip, v_ip, e_s, e_i ) |
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122 | |
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123 | CASE ( -1 ) !-- PRATHER scheme |
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124 | CALL ice_adv_prather( kt, u_ice, v_ice, & |
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125 | & ato_i, v_i, v_s, smv_i, oa_i, a_i, a_ip, v_ip, e_s, e_i ) |
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126 | |
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127 | END SELECT |
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128 | |
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129 | ! total ice fraction |
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130 | at_i(:,:) = a_i(:,:,1) |
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131 | DO jl = 2, jpl |
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132 | at_i(:,:) = at_i(:,:) + a_i(:,:,jl) |
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133 | END DO |
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134 | |
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135 | !------------ |
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136 | ! diagnostics |
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137 | !------------ |
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138 | DO jj = 1, jpj |
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139 | DO ji = 1, jpi |
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140 | diag_trp_ei (ji,jj) = ( SUM( e_i (ji,jj,1:nlay_i,:) ) - zeiold(ji,jj) ) * r1_rdtice |
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141 | diag_trp_es (ji,jj) = ( SUM( e_s (ji,jj,1:nlay_s,:) ) - zesold(ji,jj) ) * r1_rdtice |
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142 | diag_trp_smv(ji,jj) = ( SUM( smv_i(ji,jj,:) ) - zsmvold(ji,jj) ) * r1_rdtice |
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143 | diag_trp_vi (ji,jj) = SUM( v_i(ji,jj,:) - zviold(ji,jj,:) ) * r1_rdtice |
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144 | diag_trp_vs (ji,jj) = SUM( v_s(ji,jj,:) - zvsold(ji,jj,:) ) * r1_rdtice |
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145 | END DO |
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146 | END DO |
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147 | IF( iom_use('icetrp') ) CALL iom_put( "icetrp" , diag_trp_vi * rday ) ! ice volume transport |
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148 | IF( iom_use('snwtrp') ) CALL iom_put( "snwtrp" , diag_trp_vs * rday ) ! snw volume transport |
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149 | IF( iom_use('saltrp') ) CALL iom_put( "saltrp" , diag_trp_smv * rday * rhoic ) ! salt content transport |
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150 | IF( iom_use('deitrp') ) CALL iom_put( "deitrp" , diag_trp_ei ) ! advected ice enthalpy (W/m2) |
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151 | IF( iom_use('destrp') ) CALL iom_put( "destrp" , diag_trp_es ) ! advected snw enthalpy (W/m2) |
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152 | |
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153 | !-------------------------------------- |
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154 | ! Thickness correction in case too high |
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155 | !-------------------------------------- |
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156 | IF( nn_limdyn == 2 ) THEN |
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157 | ! |
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158 | CALL ice_var_zapsmall !-- zap small areas |
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159 | ! |
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160 | DO jl = 1, jpl |
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161 | DO jj = 1, jpj |
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162 | DO ji = 1, jpi |
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163 | IF ( v_i(ji,jj,jl) > 0._wp ) THEN !-- bound to zhimax |
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164 | ! |
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165 | ht_i (ji,jj,jl) = v_i (ji,jj,jl) / a_i(ji,jj,jl) |
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166 | ht_s (ji,jj,jl) = v_s (ji,jj,jl) / a_i(ji,jj,jl) |
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167 | zdv = v_i(ji,jj,jl) + v_s(ji,jj,jl) - zviold(ji,jj,jl) - zvsold(ji,jj,jl) |
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168 | ! |
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169 | IF ( ( zdv > 0.0 .AND. (ht_i(ji,jj,jl)+ht_s(ji,jj,jl)) > zhimax(ji,jj,jl) .AND. zatold(ji,jj) < 0.80 ) .OR. & |
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170 | & ( zdv <= 0.0 .AND. (ht_i(ji,jj,jl)+ht_s(ji,jj,jl)) > zhimax(ji,jj,jl) ) ) THEN |
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171 | a_i (ji,jj,jl) = ( v_i(ji,jj,jl) + v_s(ji,jj,jl) ) / zhimax(ji,jj,jl) |
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172 | ht_i(ji,jj,jl) = v_i(ji,jj,jl) / a_i(ji,jj,jl) |
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173 | ENDIF |
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174 | ! |
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175 | ENDIF |
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176 | END DO |
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177 | END DO |
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178 | END DO |
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179 | |
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180 | WHERE( ht_i(:,:,jpl) > hi_max(jpl) ) !-- bound ht_i to hi_max (99 m) |
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181 | ht_i(:,:,jpl) = hi_max(jpl) |
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182 | a_i (:,:,jpl) = v_i(:,:,jpl) / hi_max(jpl) |
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183 | END WHERE |
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184 | |
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185 | IF ( nn_pnd_scheme > 0 ) THEN !-- correct pond fraction to avoid a_ip > a_i |
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186 | WHERE( a_ip(:,:,:) > a_i(:,:,:) ) a_ip(:,:,:) = a_i(:,:,:) |
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187 | ENDIF |
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188 | ! |
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189 | ENDIF |
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190 | |
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191 | !------------------------------------------------------------ |
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192 | ! Impose a_i < amax if no ridging/rafting or in mono-category |
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193 | !------------------------------------------------------------ |
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194 | IF( l_piling ) THEN !-- simple conservative piling, comparable with 1-cat models |
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195 | at_i(:,:) = SUM( a_i(:,:,:), dim=3 ) |
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196 | DO jl = 1, jpl |
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197 | WHERE( at_i(:,:) > epsi20 ) |
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198 | a_i(:,:,jl) = a_i(:,:,jl) * ( 1._wp + MIN( rn_amax_2d(:,:) - at_i(:,:) , 0._wp ) / at_i(:,:) ) |
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199 | END WHERE |
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200 | END DO |
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201 | ENDIF |
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202 | |
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203 | ! agglomerate variables |
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204 | vt_i(:,:) = SUM( v_i(:,:,:), dim=3 ) |
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205 | vt_s(:,:) = SUM( v_s(:,:,:), dim=3 ) |
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206 | at_i(:,:) = SUM( a_i(:,:,:), dim=3 ) |
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207 | |
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208 | ! MV MP 2016 (remove once we get rid of a_i_frac and ht_i) |
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209 | IF ( nn_pnd_scheme > 0 ) THEN |
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210 | at_ip(:,:) = SUM( a_ip(:,:,:), dim = 3 ) |
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211 | vt_ip(:,:) = SUM( v_ip(:,:,:), dim = 3 ) |
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212 | ENDIF |
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213 | ! END MP 2016 |
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214 | |
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215 | ! open water = 1 if at_i=0 |
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216 | WHERE( at_i == 0._wp ) ato_i = 1._wp |
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217 | |
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218 | ! conservation test |
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219 | IF( ln_limdiachk ) CALL ice_cons_hsm(1, 'iceadv', zvi_b, zsmv_b, zei_b, zfw_b, zfs_b, zft_b) |
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220 | |
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221 | ! -------------- |
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222 | ! control prints |
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223 | ! -------------- |
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224 | IF( ln_limctl ) CALL ice_prt( kt, iiceprt, jiceprt,-1, ' - ice dyn & trp - ' ) |
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225 | ! |
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226 | IF( nn_timing == 1 ) CALL timing_stop('iceadv') |
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227 | ! |
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228 | END SUBROUTINE ice_adv |
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229 | |
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230 | #else |
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231 | !!---------------------------------------------------------------------- |
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232 | !! Default option Empty Module No sea-ice model |
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233 | !!---------------------------------------------------------------------- |
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234 | #endif |
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235 | |
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236 | !!====================================================================== |
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237 | END MODULE iceadv |
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238 | |
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