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 | PUBLIC ice_adv_init ! called by icestp |
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38 | |
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39 | INTEGER, PUBLIC :: nice_dyn ! choice of the type of advection scheme |
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40 | ! ! associated indices: |
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41 | INTEGER, PUBLIC, PARAMETER :: np_dynNO = 0 ! no ice dynamics and ice advection |
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42 | INTEGER, PUBLIC, PARAMETER :: np_dynFULL = 1 ! full ice dynamics (rheology + advection + ridging/rafting + correction) |
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43 | INTEGER, PUBLIC, PARAMETER :: np_dyn = 2 ! no ridging/rafting (rheology + advection + correction) |
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44 | INTEGER, PUBLIC, PARAMETER :: np_dynPURE = 3 ! pure dynamics (rheology + advection) |
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45 | |
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46 | !! * Substitution |
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47 | # include "vectopt_loop_substitute.h90" |
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48 | !!---------------------------------------------------------------------- |
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49 | !! NEMO/ICE 4.0 , NEMO Consortium (2017) |
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50 | !! $Id: iceadv.F90 8373 2017-07-25 17:44:54Z clem $ |
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51 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
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52 | !!---------------------------------------------------------------------- |
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53 | CONTAINS |
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54 | |
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55 | SUBROUTINE ice_adv( kt ) |
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56 | !!---------------------------------------------------------------------- |
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57 | !! *** ROUTINE ice_adv *** |
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58 | !! |
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59 | !! ** purpose : advection of sea ice |
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60 | !! |
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61 | !! ** method : variables included in the process are scalar, |
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62 | !! other values are considered as second order. |
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63 | !! For advection, one can choose between |
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64 | !! a) an Ultimate-Macho scheme (whose order is defined by nn_UMx) => ln_adv_UMx |
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65 | !! b) and a second order Prather scheme => ln_adv_Pra |
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66 | !! |
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67 | !! ** action : |
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68 | !!---------------------------------------------------------------------- |
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69 | INTEGER, INTENT(in) :: kt ! number of iteration |
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70 | ! |
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71 | INTEGER :: ji, jj, jk, jl, jt ! dummy loop indices |
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72 | INTEGER :: initad ! number of sub-timestep for the advection |
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73 | REAL(wp) :: zcfl , zusnit ! - - |
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74 | CHARACTER(len=80) :: cltmp |
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75 | ! |
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76 | REAL(wp) :: zvi_b, zsmv_b, zei_b, zfs_b, zfw_b, zft_b |
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77 | REAL(wp) :: zdv |
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78 | REAL(wp), DIMENSION(jpi,jpj) :: zatold, zeiold, zesold, zsmvold |
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79 | REAL(wp), DIMENSION(jpi,jpj,jpl) :: zhimax, zviold, zvsold |
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80 | !!--------------------------------------------------------------------- |
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81 | IF( nn_timing == 1 ) CALL timing_start('iceadv') |
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82 | |
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83 | IF( kt == nit000 .AND. lwp ) THEN |
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84 | WRITE(numout,*) |
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85 | WRITE(numout,*) 'ice_adv: sea-ice advection' |
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86 | WRITE(numout,*) '~~~~~~~' |
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87 | ENDIF |
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88 | |
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89 | CALL ice_var_agg( 1 ) ! integrated values + ato_i |
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90 | |
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91 | ! conservation test |
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92 | 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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93 | |
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94 | ! store old values for diag |
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95 | zviold (:,:,:) = v_i(:,:,:) |
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96 | zvsold (:,:,:) = v_s(:,:,:) |
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97 | zsmvold(:,:) = SUM( smv_i(:,:,:), dim=3 ) |
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98 | zeiold (:,:) = et_i(:,:) |
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99 | zesold (:,:) = et_s(:,:) |
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100 | |
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101 | ! Thickness correction init. |
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102 | zatold(:,:) = at_i |
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103 | WHERE( a_i(:,:,:) >= epsi20 ) |
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104 | ht_i(:,:,:) = v_i(:,:,:) / a_i(:,:,:) |
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105 | ht_s(:,:,:) = v_s(:,:,:) / a_i(:,:,:) |
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106 | ELSEWHERE |
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107 | ht_i(:,:,:) = 0._wp |
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108 | ht_s(:,:,:) = 0._wp |
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109 | END WHERE |
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110 | |
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111 | ! Record max of the surrounding ice thicknesses for correction in case advection creates ice too thick |
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112 | zhimax(:,:,:) = ht_i(:,:,:) + ht_s(:,:,:) |
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113 | DO jl = 1, jpl |
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114 | DO jj = 2, jpjm1 |
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115 | DO ji = 2, jpim1 |
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116 | !!gm use of MAXVAL here is very probably less efficient than expending the 9 values |
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117 | 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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118 | END DO |
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119 | END DO |
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120 | END DO |
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121 | CALL lbc_lnk( zhimax(:,:,:), 'T', 1. ) |
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122 | |
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123 | !---------- |
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124 | ! Advection |
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125 | !---------- |
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126 | IF( ln_adv_UMx ) THEN !-- ULTIMATE-MACHO scheme |
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127 | CALL ice_adv_umx( kt, u_ice, v_ice, & |
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128 | & ato_i, v_i, v_s, smv_i, oa_i, a_i, a_ip, v_ip, e_s, e_i ) |
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129 | |
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130 | ELSEIF( ln_adv_Pra ) THEN !-- PRATHER scheme |
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131 | CALL ice_adv_prather( kt, u_ice, v_ice, & |
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132 | & ato_i, v_i, v_s, smv_i, oa_i, a_i, a_ip, v_ip, e_s, e_i ) |
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133 | |
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134 | ENDIF |
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135 | |
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136 | ! total ice fraction |
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137 | at_i(:,:) = a_i(:,:,1) |
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138 | DO jl = 2, jpl |
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139 | at_i(:,:) = at_i(:,:) + a_i(:,:,jl) |
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140 | END DO |
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141 | |
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142 | !------------ |
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143 | ! diagnostics |
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144 | !------------ |
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145 | DO jj = 1, jpj |
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146 | DO ji = 1, jpi |
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147 | diag_trp_ei (ji,jj) = ( SUM( e_i (ji,jj,1:nlay_i,:) ) - zeiold(ji,jj) ) * r1_rdtice |
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148 | diag_trp_es (ji,jj) = ( SUM( e_s (ji,jj,1:nlay_s,:) ) - zesold(ji,jj) ) * r1_rdtice |
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149 | diag_trp_smv(ji,jj) = ( SUM( smv_i(ji,jj,:) ) - zsmvold(ji,jj) ) * r1_rdtice |
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150 | diag_trp_vi (ji,jj) = SUM( v_i(ji,jj,:) - zviold(ji,jj,:) ) * r1_rdtice |
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151 | diag_trp_vs (ji,jj) = SUM( v_s(ji,jj,:) - zvsold(ji,jj,:) ) * r1_rdtice |
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152 | END DO |
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153 | END DO |
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154 | IF( iom_use('icetrp') ) CALL iom_put( "icetrp" , diag_trp_vi * rday ) ! ice volume transport |
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155 | IF( iom_use('snwtrp') ) CALL iom_put( "snwtrp" , diag_trp_vs * rday ) ! snw volume transport |
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156 | IF( iom_use('saltrp') ) CALL iom_put( "saltrp" , diag_trp_smv * rday * rhoic ) ! salt content transport |
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157 | IF( iom_use('deitrp') ) CALL iom_put( "deitrp" , diag_trp_ei ) ! advected ice enthalpy (W/m2) |
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158 | IF( iom_use('destrp') ) CALL iom_put( "destrp" , diag_trp_es ) ! advected snw enthalpy (W/m2) |
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159 | |
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160 | !-------------------------------------- |
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161 | ! Thickness correction in case too high |
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162 | !-------------------------------------- |
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163 | IF( nn_icedyn == 2 ) THEN |
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164 | ! |
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165 | CALL ice_var_zapsmall !-- zap small areas |
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166 | ! |
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167 | DO jl = 1, jpl |
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168 | DO jj = 1, jpj |
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169 | DO ji = 1, jpi |
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170 | IF ( v_i(ji,jj,jl) > 0._wp ) THEN !-- bound to zhimax |
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171 | ! |
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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 | ht_s (ji,jj,jl) = v_s (ji,jj,jl) / a_i(ji,jj,jl) |
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174 | zdv = v_i(ji,jj,jl) + v_s(ji,jj,jl) - zviold(ji,jj,jl) - zvsold(ji,jj,jl) |
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175 | ! |
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176 | 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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177 | & ( zdv <= 0.0 .AND. (ht_i(ji,jj,jl)+ht_s(ji,jj,jl)) > zhimax(ji,jj,jl) ) ) THEN |
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178 | a_i (ji,jj,jl) = ( v_i(ji,jj,jl) + v_s(ji,jj,jl) ) / zhimax(ji,jj,jl) |
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179 | ht_i(ji,jj,jl) = v_i(ji,jj,jl) / a_i(ji,jj,jl) |
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180 | ENDIF |
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181 | ! |
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182 | ENDIF |
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183 | END DO |
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184 | END DO |
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185 | END DO |
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186 | |
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187 | WHERE( ht_i(:,:,jpl) > hi_max(jpl) ) !-- bound ht_i to hi_max (99 m) |
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188 | ht_i(:,:,jpl) = hi_max(jpl) |
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189 | a_i (:,:,jpl) = v_i(:,:,jpl) / hi_max(jpl) |
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190 | END WHERE |
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191 | |
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192 | IF ( nn_pnd_scheme > 0 ) THEN !-- correct pond fraction to avoid a_ip > a_i |
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193 | WHERE( a_ip(:,:,:) > a_i(:,:,:) ) a_ip(:,:,:) = a_i(:,:,:) |
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194 | ENDIF |
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195 | ! |
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196 | ENDIF |
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197 | |
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198 | !------------------------------------------------------------ |
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199 | ! Impose a_i < amax if no ridging/rafting or in mono-category |
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200 | !------------------------------------------------------------ |
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201 | IF( l_piling ) THEN !-- simple conservative piling, comparable with 1-cat models |
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202 | at_i(:,:) = SUM( a_i(:,:,:), dim=3 ) |
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203 | DO jl = 1, jpl |
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204 | WHERE( at_i(:,:) > epsi20 ) |
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205 | a_i(:,:,jl) = a_i(:,:,jl) * ( 1._wp + MIN( rn_amax_2d(:,:) - at_i(:,:) , 0._wp ) / at_i(:,:) ) |
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206 | END WHERE |
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207 | END DO |
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208 | ENDIF |
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209 | |
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210 | ! agglomerate variables |
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211 | vt_i(:,:) = SUM( v_i(:,:,:), dim=3 ) |
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212 | vt_s(:,:) = SUM( v_s(:,:,:), dim=3 ) |
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213 | at_i(:,:) = SUM( a_i(:,:,:), dim=3 ) |
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214 | |
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215 | ! MV MP 2016 (remove once we get rid of a_i_frac and ht_i) |
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216 | IF ( nn_pnd_scheme > 0 ) THEN |
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217 | at_ip(:,:) = SUM( a_ip(:,:,:), dim = 3 ) |
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218 | vt_ip(:,:) = SUM( v_ip(:,:,:), dim = 3 ) |
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219 | ENDIF |
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220 | ! END MP 2016 |
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221 | |
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222 | ! open water = 1 if at_i=0 |
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223 | WHERE( at_i == 0._wp ) ato_i = 1._wp |
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224 | |
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225 | ! conservation test |
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226 | 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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227 | |
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228 | ! -------------- |
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229 | ! control prints |
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230 | ! -------------- |
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231 | IF( ln_limctl ) CALL ice_prt( kt, iiceprt, jiceprt,-1, ' - ice dyn & trp - ' ) |
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232 | ! |
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233 | IF( nn_timing == 1 ) CALL timing_stop('iceadv') |
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234 | ! |
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235 | END SUBROUTINE ice_adv |
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236 | |
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237 | |
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238 | SUBROUTINE ice_adv_init |
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239 | !!------------------------------------------------------------------- |
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240 | !! *** ROUTINE ice_adv_init *** |
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241 | !! |
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242 | !! ** Purpose : Physical constants and parameters linked to the ice |
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243 | !! dynamics |
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244 | !! |
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245 | !! ** Method : Read the namice_adv namelist and check the ice-dynamic |
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246 | !! parameter values called at the first timestep (nit000) |
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247 | !! |
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248 | !! ** input : Namelist namice_adv |
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249 | !!------------------------------------------------------------------- |
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250 | INTEGER :: ios ! Local integer output status for namelist read |
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251 | !! |
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252 | NAMELIST/namice_adv/ ln_icedyn, nn_icedyn, rn_uice, rn_vice, ln_adv_Pra, ln_adv_UMx, nn_UMx |
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253 | !!------------------------------------------------------------------- |
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254 | ! |
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255 | REWIND( numnam_ice_ref ) ! Namelist namice_adv in reference namelist : Ice dynamics |
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256 | READ ( numnam_ice_ref, namice_adv, IOSTAT = ios, ERR = 901) |
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257 | 901 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namice_adv in reference namelist', lwp ) |
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258 | ! |
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259 | REWIND( numnam_ice_cfg ) ! Namelist namice_adv in configuration namelist : Ice dynamics |
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260 | READ ( numnam_ice_cfg, namice_adv, IOSTAT = ios, ERR = 902 ) |
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261 | 902 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namice_adv in configuration namelist', lwp ) |
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262 | IF(lwm) WRITE ( numoni, namice_adv ) |
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263 | ! |
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264 | IF(lwp) THEN ! control print |
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265 | WRITE(numout,*) |
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266 | WRITE(numout,*) 'ice_adv_init : ice parameters for ice dynamics ' |
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267 | WRITE(numout,*) '~~~~~~~~~~~~' |
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268 | WRITE(numout,*) ' Namelist namice_adv' |
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269 | WRITE(numout,*) ' Ice dynamics (T) or not (F) ln_icedyn = ', ln_icedyn |
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270 | WRITE(numout,*) ' associated switch nn_icedyn = ', nn_icedyn |
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271 | WRITE(numout,*) ' =2 all processes (default option)' |
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272 | WRITE(numout,*) ' =1 advection only (no ridging/rafting)' |
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273 | WRITE(numout,*) ' =0 advection only with prescribed velocity given by ' |
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274 | WRITE(numout,*) ' a uniform field (u,v)_ice = (rn_uice,rn_vice) = (', rn_uice,',', rn_vice,')' |
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275 | WRITE(numout,*) ' advection scheme for ice transport (limtrp)' |
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276 | WRITE(numout,*) ' type of advection scheme (Prather) ln_adv_Pra = ', ln_adv_Pra |
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277 | WRITE(numout,*) ' type of advection scheme (Ulimate-Macho) ln_adv_UMx = ', ln_adv_UMx |
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278 | WRITE(numout,*) ' order of the Ultimate-Macho scheme nn_UMx = ', nn_UMx |
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279 | ENDIF |
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280 | ! |
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281 | ! ! set the choice of ice dynamics |
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282 | IF( lk_c1d .OR. .NOT. ln_icedyn ) THEN |
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283 | nice_dyn = np_dynNO !--- no dynamics |
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284 | ELSE |
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285 | SELECT CASE( nn_icedyn ) |
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286 | CASE( 2 ) |
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287 | IF( nn_monocat /= 2 ) THEN !--- full dynamics (rheology + advection + ridging/rafting + correction) |
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288 | nice_dyn = np_dynFULL |
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289 | ELSE |
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290 | nice_dyn = np_dyn !--- dynamics without ridging/rafting |
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291 | ENDIF |
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292 | CASE( 0 , 1 ) !--- dynamics without ridging/rafting and correction |
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293 | nice_dyn = np_dynPURE |
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294 | END SELECT |
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295 | ENDIF |
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296 | ! !--- simple conservative piling, comparable with LIM2 |
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297 | l_piling = nn_icedyn == 1 .OR. ( nn_monocat == 2 .AND. jpl == 1 ) |
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298 | ! |
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299 | IF ( ( ln_adv_Pra .AND. ln_adv_UMx ) .OR. ( .NOT.ln_adv_Pra .AND. .NOT.ln_adv_UMx ) ) THEN |
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300 | CALL ctl_stop( 'ice_adv_init: choose one and only one ice advection scheme (ln_adv_Pra or ln_adv_UMx)' ) |
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301 | ENDIF |
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302 | ! |
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303 | END SUBROUTINE ice_adv_init |
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304 | |
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305 | #else |
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306 | !!---------------------------------------------------------------------- |
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307 | !! Default option Empty Module No sea-ice model |
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308 | !!---------------------------------------------------------------------- |
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309 | #endif |
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310 | |
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311 | !!====================================================================== |
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312 | END MODULE iceadv |
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313 | |
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