1 | !> \file bmelt-ismip6-param.f90 |
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2 | !! bmelt computed from the non-local formulation suggested in ismip6 |
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3 | !< |
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4 | |
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5 | !> \namespace bmelt-ismip6-param |
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6 | !! Module for sub-shelf basal melting (grounded or ice shelves) |
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7 | !! \author aquiquet |
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8 | !! \date April 2019 |
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9 | !! @note from ismip6 suggested parametrisation |
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10 | !! Should be chosen in the module_choix |
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11 | !! @note Used modules |
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12 | !! @note - use module3D_phy |
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13 | !! @note - use netcdf |
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14 | !! @note - use io_netcdf_grisli |
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15 | !< |
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16 | |
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17 | !ncwa -a time TO_file_mean.nc TO_file_mean2.nc |
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18 | !cdo yearmean TO_file.nc TO_file_mean.nc |
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19 | |
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20 | module bmelt_beckmann_gcm_mod |
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21 | |
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22 | !$ USE OMP_LIB |
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23 | use module3D_phy,only: nx,ny,dx,dy,ro,rofresh,row,cl,S,H,sealevel_2d,flot,bmelt,dirnameinp,num_param,num_rep_42,time,dt,debug_3d |
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24 | ! note: the geom. (nx,ny,dx,dy) come from module_geoplace |
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25 | ! note: the densities come from param_phy_mod |
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26 | use netcdf |
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27 | use io_netcdf_grisli |
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28 | |
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29 | implicit none |
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30 | |
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31 | integer, parameter :: nbassins = 10 !< number of sectors in the ocean |
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32 | integer :: nzoc !< number of vertical levels in the ocean (read in netcdf T/S file) |
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33 | real*8 :: coef_OM !combined coefficient by DeConto et Pollard (m/yr/C2) |
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34 | real*8 :: K_t |
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35 | real*8 :: n_tour |
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36 | real*8, dimension (:,:,:), allocatable :: temp_ocean , mask_oce2, temp_ocean_2 !< thermal forcing , input |
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37 | real*8, dimension (:,:,:), allocatable :: salinity_ocean !< thermal forcing , input |
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38 | |
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39 | real :: bmelt_empty ! bmelt value for bassins without any GCM data |
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40 | |
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41 | ! integer, dimension (nx,ny) :: profondeur |
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42 | integer, dimension(nx,ny) :: bassin |
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43 | real*8, dimension (:), allocatable :: zoc !< depth of oceanic levels , input |
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44 | real*8, dimension (nx,ny) :: mesh_area !< grid cell area |
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45 | real*8, dimension (nx,ny) :: ice_draft !< ice draft (S-H) |
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46 | character(len=200) :: TO_file, SO_file, Bassin_file ! fichiers de forcage |
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47 | logical, dimension(nbassins) :: mask_bassin_vide ! mask true if bassin without any GCM data |
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48 | |
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49 | contains |
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50 | |
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51 | |
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52 | subroutine init_bmelt |
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53 | |
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54 | ! this routine is used to initialise the sub-shelf basal melting rate |
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55 | |
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56 | |
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57 | real*8, dimension(:), pointer :: tab1d => null() !< 2d array real pointer, needed for netcdf readings |
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58 | real*8, dimension(:,:,:), pointer :: tab3d => null() !< 3d array real pointer, needed for netcdf readings |
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59 | real*8, dimension(:,:), pointer :: tab2d => null() !< 3d array real pointer, needed for netcdf readings |
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60 | character(len=100) :: file_inputs !< files read |
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61 | character(len=100) :: TO_file !< files read |
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62 | character(len=100) :: SO_file !< files read |
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63 | character(len=100) :: Bassin_file !< files read |
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64 | integer :: i,j,k |
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65 | integer :: n,imin,imax,jmin,jmax |
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66 | logical :: test ! pour stoper boucle |
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67 | integer :: nbr_pts |
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68 | integer :: depth_max_grid ! max depth level were T S are defined (all grid) |
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69 | integer, dimension(nx,ny) :: depth_max ! max depth were T S are defined for every point |
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70 | integer, dimension(:,:,:), allocatable :: mask_gcm ! mask were T S are defined |
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71 | integer, dimension(:,:,:), allocatable :: mask_gcm_init ! mask were T S are defined in GCM before interpolation |
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72 | integer, dimension(nbassins) :: max_depth_bassin ! max level were T S are defined for every bassins |
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73 | integer :: nmax ! to avoid inifite loop |
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74 | integer :: err |
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75 | namelist/bmelt_beckmann_gcm_mod/TO_file,SO_file,Bassin_file,bmelt_empty |
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76 | |
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77 | rewind(num_param) ! loop back at the beginning of the param_list.dat file |
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78 | read(num_param,bmelt_beckmann_gcm_mod) |
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79 | write(num_rep_42,'(A)')'!___________________________________________________________' |
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80 | write(num_rep_42,*) |
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81 | write(num_rep_42,bmelt_beckmann_gcm_mod) |
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82 | |
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83 | K_t = 15.77 |
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84 | |
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85 | file_inputs=TRIM(DIRNAMEINP)//'Snapshots-GCM/'//TRIM(TO_file) |
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86 | |
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87 | ! read the number of levels in T/S files : |
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88 | nzoc = read_nzoc(file_inputs) |
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89 | ! print*, 'nzoc = ',nzoc |
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90 | |
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91 | ! allocate tabs : |
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92 | if (.not.allocated(zoc)) then |
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93 | allocate(zoc(nzoc),stat=err) |
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94 | if (err/=0) then |
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95 | print *,"erreur a l'allocation du tableau zoc",err |
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96 | stop 4 |
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97 | end if |
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98 | end if |
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99 | if (.not.allocated(temp_ocean)) then |
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100 | allocate(temp_ocean(nx,ny,nzoc),stat=err) |
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101 | if (err/=0) then |
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102 | print *,"erreur a l'allocation du tableau temp_ocean",err |
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103 | stop 4 |
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104 | end if |
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105 | end if |
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106 | if (.not.allocated(mask_oce2)) then |
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107 | allocate(mask_oce2(nx,ny,nzoc),stat=err) |
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108 | if (err/=0) then |
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109 | print *,"erreur a l'allocation du tableau mask_oce2",err |
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110 | stop 4 |
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111 | end if |
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112 | end if |
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113 | if (.not.allocated(temp_ocean_2)) then |
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114 | allocate(temp_ocean_2(nx,ny,nzoc),stat=err) |
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115 | if (err/=0) then |
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116 | print *,"erreur a l'allocation du tableau temp_ocean_2",err |
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117 | stop 4 |
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118 | end if |
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119 | end if |
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120 | if (.not.allocated(salinity_ocean)) then |
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121 | allocate(salinity_ocean(nx,ny,nzoc),stat=err) |
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122 | if (err/=0) then |
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123 | print *,"erreur a l'allocation du tableau salinity_ocean",err |
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124 | stop 4 |
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125 | end if |
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126 | end if |
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127 | if (.not.allocated(mask_gcm)) then |
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128 | allocate(mask_gcm(nx,ny,nzoc),stat=err) |
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129 | if (err/=0) then |
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130 | print *,"erreur a l'allocation du tableau mask_gcm",err |
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131 | stop 4 |
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132 | end if |
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133 | end if |
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134 | if (.not.allocated(mask_gcm_init)) then |
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135 | allocate(mask_gcm_init(nx,ny,nzoc),stat=err) |
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136 | if (err/=0) then |
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137 | print *,"erreur a l'allocation du tableau mask_gcm_init",err |
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138 | stop 4 |
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139 | end if |
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140 | end if |
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141 | |
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142 | call Read_Ncdf_var('lev',file_inputs,tab1d) |
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143 | zoc(:) = -tab1d(:) |
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144 | call Read_Ncdf_var('thetao',file_inputs,tab3d) |
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145 | temp_ocean(:,:,:) = tab3d(:,:,:) |
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146 | |
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147 | file_inputs=TRIM(DIRNAMEINP)//'Snapshots-GCM/'//TRIM(SO_file) |
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148 | call Read_Ncdf_var('so',file_inputs,tab3d) |
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149 | salinity_ocean(:,:,:) = tab3d(:,:,:) |
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150 | |
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151 | file_inputs=TRIM(DIRNAMEINP)//'Snapshots-GCM/'//TRIM(Bassin_file) |
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152 | call Read_Ncdf_var('mask',file_inputs,tab2d) |
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153 | bassin(:,:) = tab2d(:,:) |
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154 | |
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155 | ! calcul de la profondeur max pour chaque point : |
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156 | |
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157 | !$OMP PARALLEL |
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158 | !$OMP WORKSHARE |
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159 | depth_max(:,:) = 0 |
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160 | !$OMP END WORKSHARE |
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161 | !$OMP END PARALLEL |
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162 | |
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163 | !$OMP PARALLEL PRIVATE(k) |
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164 | !$OMP DO |
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165 | do j=1,ny |
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166 | do i=1,nx |
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167 | if (temp_ocean(i,j,1).lt.1.e10) then |
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168 | k=2 |
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169 | do while (temp_ocean(i,j,k).lt.1.e10 .and. (k.le.nzoc)) |
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170 | k=k+1 |
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171 | enddo |
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172 | depth_max(i,j) = k-1 ! max level were T and S are defined for this point |
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173 | endif |
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174 | enddo |
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175 | enddo |
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176 | !$OMP END DO |
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177 | !$OMP END PARALLEL |
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178 | |
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179 | depth_max_grid=maxval(depth_max(:,:)) ! max depth were T and S are defined in the grid |
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180 | |
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181 | !$OMP PARALLEL |
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182 | if (depth_max_grid.lt.nzoc) then |
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183 | !$OMP DO |
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184 | do j=1,ny |
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185 | do i=1,nx |
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186 | if (temp_ocean(i,j,1).lt.1.e10 .and. depth_max(i,j).eq.depth_max_grid) then ! T and S are defined up to depth_max_grid |
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187 | ! extension of the values downwards |
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188 | do k=depth_max(i,j)+1,nzoc |
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189 | temp_ocean(i,j,k)=temp_ocean(i,j,depth_max_grid) |
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190 | salinity_ocean(i,j,k) = salinity_ocean(i,j,depth_max_grid) |
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191 | enddo |
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192 | endif |
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193 | enddo |
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194 | enddo |
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195 | !$OMP END DO |
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196 | endif |
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197 | |
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198 | |
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199 | !$OMP DO |
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200 | do n=1,nbassins |
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201 | max_depth_bassin(n)=maxval(depth_max(:,:),mask=bassin(:,:).eq.n) |
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202 | enddo |
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203 | !$OMP END DO |
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204 | |
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205 | ! print*,'max_depth_bassin bassin ', max_depth_bassin |
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206 | |
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207 | |
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208 | ! mask_gcm_init = 1 si valeur dans gcm, 0 si pas de valeur => tableau avec uniquement les valeurs initiales du GCM |
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209 | !$OMP WORKSHARE |
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210 | mask_gcm_init(:,:,:) = 1 |
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211 | where (temp_ocean(:,:,:).gt.1.e10) |
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212 | mask_gcm_init(:,:,:) = 0 |
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213 | endwhere |
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214 | |
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215 | ! mask_gcm = 1 si valeur dans gcm, 0 si pas de valeur => tableau update lorsqu'on rempli la grille |
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216 | mask_gcm(:,:,:) = 1 |
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217 | where (temp_ocean(:,:,:).gt.1.e10) |
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218 | mask_gcm(:,:,:) = 0 |
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219 | endwhere |
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220 | !$OMP END WORKSHARE |
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221 | |
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222 | |
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223 | ! mask_bassin_vide : identifie les bassins oceaniques sans aucune valeur du GCM en surface |
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224 | !$OMP BARRIER |
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225 | !$OMP DO |
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226 | do n=1,nbassins |
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227 | if (sum(mask_gcm(:,:,1),mask=bassin(:,:).eq.n).eq.0) then |
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228 | mask_bassin_vide(n)=.true. |
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229 | else |
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230 | mask_bassin_vide(n)=.false. |
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231 | endif |
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232 | enddo |
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233 | !$OMP END DO |
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234 | !$OMP END PARALLEL |
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235 | nmax = max(nx,ny) |
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236 | |
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237 | |
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238 | !$OMP PARALLEL PRIVATE(n,test) |
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239 | !$OMP DO |
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240 | do k=1,nzoc |
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241 | do j=1,ny |
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242 | do i=1,nx |
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243 | if ((mask_gcm(i,j,k).eq.0) .and. (.not.mask_bassin_vide(bassin(i,j))) .and. (k.le.max_depth_bassin(bassin(i,j)))) then ! point sans valeur dans bassin avec des points GCM |
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244 | test=.true. |
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245 | n=1 |
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246 | do while (test.and.(n.lt.nmax)) |
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247 | imin=max(1,i-n) |
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248 | imax=min(NX,i+n) |
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249 | jmin=max(1,j-n) |
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250 | jmax=min(NY,j+n) |
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251 | nbr_pts = count((bassin(imin:imax,jmin:jmax).eq.bassin(i,j)) .and. (mask_gcm_init(imin:imax,jmin:jmax,k).eq.1)) |
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252 | if (nbr_pts.ge.1) then |
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253 | temp_ocean(i,j,k)=sum(temp_ocean(imin:imax,jmin:jmax,k),mask = (bassin(imin:imax,jmin:jmax).eq.bassin(i,j)) & |
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254 | .and. (mask_gcm_init(imin:imax,jmin:jmax,k).eq.1)) / nbr_pts ! calcul la moyenne de temp_ocean sur les pts non masques |
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255 | salinity_ocean(i,j,k)=sum(salinity_ocean(imin:imax,jmin:jmax,k),mask = (bassin(imin:imax,jmin:jmax).eq.bassin(i,j)) & |
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256 | .and. (mask_gcm_init(imin:imax,jmin:jmax,k).eq.1)) / nbr_pts ! calcul la moyenne de salinity_ocean sur les pts non masques |
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257 | mask_gcm(i,j,k)=1 |
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258 | test=.false. |
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259 | endif |
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260 | n=n+1 |
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261 | enddo |
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262 | if (n.eq.nmax) print*,'bug boucle infinie',n,i,j,k, mask_gcm(i,j,k), mask_bassin_vide(bassin(i,j)),max_depth_bassin(bassin(i,j)), bassin(i,j) |
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263 | endif |
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264 | enddo |
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265 | enddo |
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266 | enddo |
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267 | !$OMP END DO |
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268 | |
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269 | ! extension des valeurs de temp salinité sur les points des secteurs vides |
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270 | !$OMP DO |
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271 | do k=1,nzoc |
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272 | do j=1,ny |
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273 | do i=1,nx |
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274 | !if ((mask_gcm(i,j,k).eq.0) .and. (mask_bassin_vide(bassin(i,j)))) then ! point sans valeur dans bassin sans aucun points GCM |
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275 | if (mask_gcm(i,j,k).eq.0) then ! point sans valeur dans bassin sans aucun points GCM |
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276 | test=.true. |
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277 | n=1 |
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278 | do while (test.and.(n.lt.nmax)) |
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279 | imin=max(1,i-n) |
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280 | imax=min(NX,i+n) |
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281 | jmin=max(1,j-n) |
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282 | jmax=min(NY,j+n) |
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283 | nbr_pts = count(mask_gcm_init(imin:imax,jmin:jmax,k).eq.1) |
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284 | if (nbr_pts.ge.1) then |
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285 | temp_ocean(i,j,k)=sum(temp_ocean(imin:imax,jmin:jmax,k),mask = mask_gcm_init(imin:imax,jmin:jmax,k).eq.1) / nbr_pts ! calcul la moyenne de temp_ocean sur les pts non masques |
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286 | salinity_ocean(i,j,k)=sum(salinity_ocean(imin:imax,jmin:jmax,k),mask = mask_gcm_init(imin:imax,jmin:jmax,k).eq.1) / nbr_pts! calcul la moyenne de salinity_ocean sur les pts non masques |
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287 | mask_gcm(i,j,k)=1 |
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288 | test=.false. |
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289 | endif |
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290 | n=n+1 |
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291 | enddo |
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292 | endif |
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293 | enddo |
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294 | enddo |
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295 | enddo |
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296 | !$OMP END DO |
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297 | |
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298 | !$OMP WORKSHARE |
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299 | debug_3d(:,:,129) = temp_ocean(:,:,19) |
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300 | debug_3d(:,:,130) = salinity_ocean(:,:,19) |
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301 | mesh_area(:,:) = dx*dy ! this could be corrected to account for projection deformation |
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302 | !$OMP END WORKSHARE |
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303 | !$OMP END PARALLEL |
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304 | |
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305 | ! print*,'zoc profondeur : ',zoc |
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306 | |
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307 | ! print*, 'temp_ocean', temp_ocean(1,1,:) |
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308 | ! print*, 'salinity_ocean', salinity_ocean(1,1,:) |
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309 | |
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310 | !temp_ocean(:,:,:) = temp_ocean(:,:,:) - 273.15 |
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311 | |
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312 | coef_OM = K_t * 0.01420418516 |
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313 | |
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314 | if ( ubound(zoc,dim=1).ne.nzoc) then |
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315 | write (*,*) "bmelt_beckmann_gcm: pb with the number of oceanic layers! abort..." |
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316 | STOP |
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317 | endif |
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318 | |
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319 | end subroutine init_bmelt |
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320 | |
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321 | |
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322 | |
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323 | subroutine bmeltshelf |
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324 | |
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325 | ! this routine is used to compute the sub-shelf basal melting rate |
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326 | |
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327 | real*8, dimension(nx,ny) :: TO_draft |
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328 | real*8, dimension(nx,ny) :: SO_draft |
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329 | real*8, dimension(nx,ny) :: T_freez |
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330 | |
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331 | integer :: i,j,k,kinf,ksup,ngr |
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332 | real*8 :: bmloc |
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333 | |
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334 | |
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335 | !$OMP PARALLEL PRIVATE(ksup,kinf,ngr,bmloc) |
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336 | !$OMP WORKSHARE |
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337 | ice_draft(:,:) = S(:,:)-H(:,:)-sealevel_2d(:,:) |
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338 | !$OMP END WORKSHARE |
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339 | |
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340 | !$OMP DO |
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341 | do j=1,ny |
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342 | do i=1,nx |
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343 | |
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344 | if (flot(i,j).and.(temp_ocean(i,j,1).lt.1.e10)) then |
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345 | |
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346 | if (H(i,j).gt.0.d0) then !limit on the critical thickness of ice to define the ice shelf mask |
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347 | ! we should use Hcalv |
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348 | |
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349 | ! 1 - Linear interpolation of the thermal forcing on the ice draft depth : |
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350 | ksup=nzoc |
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351 | do k=nzoc-1,2,-1 |
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352 | if ( zoc(k) .le. ice_draft(i,j) ) ksup = k |
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353 | enddo |
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354 | kinf = ksup - 1 |
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355 | if ( ice_draft(i,j) .gt. zoc(1) ) then |
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356 | TO_draft(i,j) = temp_ocean(i,j,1) |
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357 | SO_draft(i,j) = salinity_ocean(i,j,1) |
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358 | T_freez(i,j) = 0.0939 - 0.057 * salinity_ocean(i,j,1) + 0.000764 * zoc(1) |
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359 | elseif ( ice_draft(i,j) .lt. zoc(nzoc) ) then |
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360 | TO_draft(i,j) = temp_ocean(i,j,nzoc) |
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361 | SO_draft(i,j) = salinity_ocean(i,j,nzoc) |
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362 | T_freez(i,j) = 0.0939 - 0.057 * salinity_ocean(i,j,nzoc) + 0.000764 * zoc(nzoc) |
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363 | else |
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364 | !TO_draft(i,j) = ( (zoc(ksup)-ice_draft(i,j)) * temp_ocean(i,j,kinf) & |
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365 | ! & + (ice_draft(i,j)-zoc(kinf)) * temp_ocean(i,j,ksup) ) / (zoc(ksup)-zoc(kinf)) |
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366 | !SO_draft(i,j) = ( (zoc(ksup)-ice_draft(i,j)) * salinity_ocean(i,j,kinf) & |
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367 | ! & + (ice_draft(i,j)-zoc(kinf)) * salinity_ocean(i,j,ksup) ) / (zoc(ksup)-zoc(kinf)) |
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368 | TO_draft(i,j) = temp_ocean(i,j,ksup) + ((ice_draft(i,j)-zoc(ksup))*(temp_ocean(i,j,kinf)-temp_ocean(i,j,ksup))/(zoc(kinf)-zoc(ksup))) |
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369 | SO_draft(i,j) = salinity_ocean(i,j,ksup) + ((ice_draft(i,j)-zoc(ksup))*(salinity_ocean(i,j,kinf)-salinity_ocean(i,j,ksup))/(zoc(kinf)-zoc(ksup))) |
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370 | T_freez(i,j) = 0.0939 - 0.057 * SO_draft(i,j) + 0.000764 * ice_draft(i,j) |
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371 | endif |
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372 | |
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373 | else |
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374 | TO_draft(i,j) = temp_ocean(i,j,1) |
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375 | SO_draft(i,j) = salinity_ocean(i,j,1) |
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376 | T_freez(i,j) = 0.0939 - 0.057 * salinity_ocean(i,j,1) + 0.000764 * zoc(1) |
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377 | endif |
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378 | |
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379 | else |
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380 | TO_draft(i,j) = -9999.9d0 |
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381 | SO_draft(i,j) = -9999.9d0 |
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382 | T_freez(i,j) = -9999.9d0 |
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383 | endif |
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384 | enddo |
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385 | enddo |
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386 | !$OMP END DO |
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387 | |
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388 | ! 3 - Calculation of melting rate : |
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389 | |
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390 | ! melt rate in m/yr (meters of pure water per year) : |
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391 | ! [ * rhofw_SI / rhoi_SI to get it in meters of ice per year ] |
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392 | !$OMP DO |
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393 | do j=1,ny |
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394 | do i=1,nx |
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395 | if ( TO_draft(i,j) .gt. -9000.d0 ) then ! floating points |
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396 | if (mask_bassin_vide(bassin(i,j)) .or. (bassin(i,j).eq.1)) then ! bassins without any GCM data or bassin 1 |
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397 | bmelt(i,j) = bmelt_empty |
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398 | else ! Bassins with GCM data |
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399 | bmelt(i,j) = coef_OM * ( TO_draft(i,j) - T_freez(i,j) )* abs( TO_draft(i,j) - T_freez(i,j) ) |
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400 | endif |
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401 | else |
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402 | bmelt(i,j)=0. |
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403 | endif |
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404 | enddo |
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405 | enddo |
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406 | !$OMP END DO |
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407 | |
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408 | !$OMP DO |
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409 | do j=2,ny-1 |
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410 | do i=2,nx-1 |
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411 | if ( TO_draft(i,j) .le. -9000.d0 ) then !grounded points |
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412 | ngr=0 |
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413 | bmloc=0.d0 |
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414 | if (TO_draft(i+1,j) .le. -9000.d0 ) then |
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415 | ngr=ngr+1 |
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416 | bmloc=bmloc+bmelt(i+1,j) |
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417 | endif |
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418 | if (TO_draft(i-1,j) .le. -9000.d0 ) then |
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419 | ngr=ngr+1 |
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420 | bmloc=bmloc+bmelt(i-1,j) |
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421 | endif |
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422 | if (TO_draft(i,j+1) .le. -9000.d0 ) then |
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423 | ngr=ngr+1 |
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424 | bmloc=bmloc+bmelt(i,j+1) |
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425 | endif |
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426 | if (TO_draft(i,j-1) .le. -9000.d0 ) then |
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427 | ngr=ngr+1 |
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428 | bmloc=bmloc+bmelt(i,j-1) |
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429 | endif |
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430 | bmelt(i,j)=(ngr/4.)*bmloc+(1-ngr/4.)*bmelt(i,j) |
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431 | endif |
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432 | enddo |
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433 | enddo |
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434 | !$OMP END DO |
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435 | !$OMP END PARALLEL |
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436 | |
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437 | end subroutine bmeltshelf |
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438 | |
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439 | function read_nzoc(filename) |
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440 | ! Reads number of vertical levels in ocean forcing NetCDF File. |
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441 | ! Returns the levels number |
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442 | |
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443 | ! Reads |
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444 | use netcdf |
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445 | |
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446 | implicit none |
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447 | ! input |
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448 | character (len = *), intent(in) :: filename |
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449 | integer :: read_nzoc |
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450 | |
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451 | ! This will be the netCDF ID for the file and data variable. |
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452 | integer :: ncid, varid, status |
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453 | integer, dimension(3) :: count |
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454 | integer, dimension(3) :: start |
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455 | |
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456 | ! Open the file. |
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457 | status = nf90_open(filename, nf90_nowrite, ncid) |
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458 | if (status/=nf90_noerr) then |
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459 | write(*,*)"unable to open netcdf file : ",filename |
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460 | stop |
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461 | endif |
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462 | |
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463 | ! Get the varids of the netCDF variable. |
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464 | status = nf90_inq_dimid(ncid, "lev", varid) |
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465 | status = nf90_inquire_dimension(ncid, varid, len = read_nzoc) |
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466 | |
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467 | ! Close the file. This frees up any internal netCDF resources |
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468 | ! associated with the file. |
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469 | status = nf90_close(ncid) |
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470 | |
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471 | end function read_nzoc |
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472 | |
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473 | end module bmelt_beckmann_gcm_mod |
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