1 | !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! |
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2 | ! |
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3 | ! This file converts a POP grid.dat file to a remapping grid file |
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4 | ! in netCDF format. |
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5 | ! |
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6 | !----------------------------------------------------------------------- |
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7 | ! |
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8 | ! CVS:$Id: convertPOPT.f,v 1.4 2001/08/21 21:22:56 pwjones Exp $ |
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9 | ! |
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10 | ! Copyright (c) 1997, 1998 the Regents of the University of |
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11 | ! California. |
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12 | ! |
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13 | ! Unless otherwise indicated, this software has been authored |
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14 | ! by an employee or employees of the University of California, |
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15 | ! operator of the Los Alamos National Laboratory under Contract |
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16 | ! No. W-7405-ENG-36 with the U.S. Department of Energy. The U.S. |
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17 | ! Government has rights to use, reproduce, and distribute this |
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18 | ! software. The public may copy and use this software without |
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19 | ! charge, provided that this Notice and any statement of authorship |
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20 | ! are reproduced on all copies. Neither the Government nor the |
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21 | ! University makes any warranty, express or implied, or assumes |
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22 | ! any liability or responsibility for the use of this software. |
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23 | ! |
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24 | !*********************************************************************** |
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25 | |
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26 | program convertPOPT |
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27 | |
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28 | !----------------------------------------------------------------------- |
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29 | ! |
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30 | ! This file converts a POP grid.dat file to a remapping grid file. |
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31 | ! |
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32 | !----------------------------------------------------------------------- |
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33 | |
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34 | use kinds_mod |
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35 | use constants |
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36 | use iounits |
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37 | use netcdf_mod |
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38 | |
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39 | implicit none |
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40 | |
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41 | !----------------------------------------------------------------------- |
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42 | ! |
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43 | ! variables that describe the grid |
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44 | ! 4/3 nx = 192, ny = 128 |
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45 | ! 2/3 (mod) nx = 384, ny = 288 |
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46 | ! x3p Greenland DP nx = 100, ny = 116 |
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47 | ! x2p Greenland DP nx = 160, ny = 192 |
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48 | ! x1p Greenland DP nx = 320, ny = 384 |
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49 | ! |
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50 | !----------------------------------------------------------------------- |
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51 | |
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52 | integer (kind=int_kind), parameter :: |
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53 | & nx = 320, ny = 384, |
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54 | & grid_size = nx*ny, |
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55 | & grid_rank = 2, |
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56 | & grid_corners = 4 |
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57 | |
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58 | integer (kind=int_kind), dimension(2) :: |
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59 | & grid_dims ! size of each dimension |
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60 | |
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61 | character(char_len), parameter :: |
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62 | & grid_name = 'Greenland DP x1p', |
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63 | & grid_file_in = '/scratch/pwjones/grid.320x384.da', |
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64 | & grid_topo_in = '/scratch/pwjones/kmt.320x384.da', |
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65 | & grid_file_out = '/scratch/pwjones/Greenland_DP_x1p.nc' |
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66 | |
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67 | real (kind=dbl_kind), parameter :: |
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68 | & radius = 6370.0e5_dbl_kind ! radius of Earth (cm) |
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69 | &, area_norm = one/(radius*radius) |
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70 | |
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71 | !----------------------------------------------------------------------- |
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72 | ! |
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73 | ! grid coordinates and masks |
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74 | ! |
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75 | !----------------------------------------------------------------------- |
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76 | |
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77 | integer (kind=int_kind), dimension(grid_size) :: |
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78 | & grid_imask |
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79 | |
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80 | real (kind=dbl_kind), dimension(grid_size) :: |
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81 | & grid_area , ! area as computed in POP |
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82 | & grid_center_lat, ! lat/lon coordinates for |
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83 | & grid_center_lon ! each grid center in radians |
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84 | |
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85 | real (kind=dbl_kind), dimension(grid_corners,grid_size) :: |
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86 | & grid_corner_lat, ! lat/lon coordinates for |
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87 | & grid_corner_lon ! each grid corner in radians |
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88 | |
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89 | real (kind=dbl_kind), dimension(nx,ny) :: |
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90 | & HTN, HTE ! T-cell grid lengths |
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91 | |
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92 | !----------------------------------------------------------------------- |
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93 | ! |
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94 | ! other local variables |
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95 | ! |
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96 | !----------------------------------------------------------------------- |
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97 | |
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98 | integer (kind=int_kind) :: i, j, n, iunit, ocn_add, im1, jm1 |
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99 | |
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100 | integer (kind=int_kind) :: |
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101 | & ncstat, ! general netCDF status variable |
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102 | & nc_grid_id, ! netCDF grid dataset id |
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103 | & nc_gridsize_id, ! netCDF grid size dim id |
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104 | & nc_gridcorn_id, ! netCDF grid corner dim id |
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105 | & nc_gridrank_id, ! netCDF grid rank dim id |
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106 | & nc_griddims_id, ! netCDF grid dimensions id |
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107 | & nc_grdcntrlat_id, ! netCDF grid center lat id |
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108 | & nc_grdcntrlon_id, ! netCDF grid center lon id |
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109 | & nc_grdimask_id, ! netCDF grid mask id |
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110 | & nc_gridarea_id, ! netCDF grid area id |
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111 | & nc_grdcrnrlat_id, ! netCDF grid corner lat id |
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112 | & nc_grdcrnrlon_id ! netCDF grid corner lon id |
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113 | |
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114 | integer (kind=int_kind), dimension(2) :: |
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115 | & nc_dims2_id ! netCDF dim id array for 2-d arrays |
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116 | |
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117 | real (kind=dbl_kind) :: tmplon, dxt, dyt |
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118 | |
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119 | !----------------------------------------------------------------------- |
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120 | ! |
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121 | ! read in grid info |
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122 | ! lat/lon info is on velocity points which correspond |
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123 | ! to the NE corner (in logical space) of the grid cell. |
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124 | ! |
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125 | !----------------------------------------------------------------------- |
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126 | |
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127 | call get_unit(iunit) |
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128 | open(unit=iunit, file=grid_topo_in, status='old', |
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129 | & form='unformatted', access='direct', recl=grid_size*4) |
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130 | read (unit=iunit,rec=1) grid_imask |
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131 | call release_unit(iunit) |
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132 | |
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133 | call get_unit(iunit) |
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134 | open(unit=iunit, file=grid_file_in, status='old', |
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135 | & form='unformatted', access='direct', recl=grid_size*8) |
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136 | read (unit=iunit, rec=1) grid_corner_lat(3,:) |
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137 | read (unit=iunit, rec=2) grid_corner_lon(3,:) |
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138 | read (unit=iunit, rec=3) HTN |
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139 | read (unit=iunit, rec=4) HTE |
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140 | call release_unit(iunit) |
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141 | |
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142 | grid_dims(1) = nx |
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143 | grid_dims(2) = ny |
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144 | |
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145 | !----------------------------------------------------------------------- |
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146 | ! |
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147 | ! convert KMT field to integer grid mask |
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148 | ! |
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149 | !----------------------------------------------------------------------- |
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150 | |
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151 | grid_imask = min(grid_imask, 1) |
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152 | |
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153 | !----------------------------------------------------------------------- |
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154 | ! |
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155 | ! compute remaining corners |
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156 | ! |
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157 | !----------------------------------------------------------------------- |
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158 | |
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159 | do j=1,ny |
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160 | do i=1,nx |
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161 | ocn_add = (j-1)*nx + i |
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162 | if (i .ne. 1) then |
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163 | im1 = ocn_add - 1 |
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164 | else |
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165 | im1 = ocn_add + nx - 1 |
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166 | endif |
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167 | |
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168 | grid_corner_lat(4,ocn_add) = grid_corner_lat(3,im1) |
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169 | grid_corner_lon(4,ocn_add) = grid_corner_lon(3,im1) |
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170 | end do |
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171 | end do |
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172 | |
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173 | do j=2,ny |
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174 | do i=1,nx |
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175 | ocn_add = (j-1)*nx + i |
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176 | jm1 = (j-2)*nx + i |
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177 | |
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178 | grid_corner_lat(2,ocn_add) = grid_corner_lat(3,jm1) |
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179 | grid_corner_lat(1,ocn_add) = grid_corner_lat(4,jm1) |
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180 | |
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181 | grid_corner_lon(2,ocn_add) = grid_corner_lon(3,jm1) |
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182 | grid_corner_lon(1,ocn_add) = grid_corner_lon(4,jm1) |
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183 | end do |
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184 | end do |
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185 | |
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186 | !----------------------------------------------------------------------- |
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187 | ! |
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188 | ! mock up the lower row boundaries |
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189 | ! |
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190 | !----------------------------------------------------------------------- |
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191 | |
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192 | do i=1,nx |
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193 | grid_corner_lat(1,i) = -pih + tiny |
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194 | grid_corner_lat(2,i) = -pih + tiny |
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195 | |
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196 | grid_corner_lon(1,i) = grid_corner_lon(4,i) |
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197 | grid_corner_lon(2,i) = grid_corner_lon(3,i) |
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198 | end do |
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199 | |
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200 | !----------------------------------------------------------------------- |
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201 | ! |
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202 | ! correct for 0,2pi longitude crossings |
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203 | ! |
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204 | !----------------------------------------------------------------------- |
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205 | |
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206 | do ocn_add=1,grid_size |
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207 | if (grid_corner_lon(1,ocn_add) > pi2) |
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208 | & grid_corner_lon(1,ocn_add) = |
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209 | & grid_corner_lon(1,ocn_add) - pi2 |
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210 | if (grid_corner_lon(1,ocn_add) < 0.0) |
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211 | & grid_corner_lon(1,ocn_add) = |
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212 | & grid_corner_lon(1,ocn_add) + pi2 |
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213 | do n=2,grid_corners |
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214 | tmplon = grid_corner_lon(n ,ocn_add) - |
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215 | & grid_corner_lon(n-1,ocn_add) |
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216 | if (tmplon < -three*pih) grid_corner_lon(n,ocn_add) = |
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217 | & grid_corner_lon(n,ocn_add) + pi2 |
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218 | if (tmplon > three*pih) grid_corner_lon(n,ocn_add) = |
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219 | & grid_corner_lon(n,ocn_add) - pi2 |
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220 | end do |
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221 | end do |
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222 | |
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223 | !----------------------------------------------------------------------- |
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224 | ! |
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225 | ! compute ocean cell centers by averaging corner values |
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226 | ! |
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227 | !----------------------------------------------------------------------- |
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228 | |
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229 | do ocn_add=1,grid_size |
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230 | grid_center_lat(ocn_add) = grid_corner_lat(1,ocn_add) |
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231 | grid_center_lon(ocn_add) = grid_corner_lon(1,ocn_add) |
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232 | do n=2,grid_corners |
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233 | grid_center_lat(ocn_add) = grid_center_lat(ocn_add) + |
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234 | & grid_corner_lat(n,ocn_add) |
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235 | grid_center_lon(ocn_add) = grid_center_lon(ocn_add) + |
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236 | & grid_corner_lon(n,ocn_add) |
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237 | end do |
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238 | grid_center_lat(ocn_add) = grid_center_lat(ocn_add)/ |
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239 | & float(grid_corners) |
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240 | grid_center_lon(ocn_add) = grid_center_lon(ocn_add)/ |
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241 | & float(grid_corners) |
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242 | if (grid_center_lon(ocn_add) > pi2) |
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243 | & grid_center_lon(ocn_add) = grid_center_lon(ocn_add) - pi2 |
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244 | if (grid_center_lon(ocn_add) < 0.0) |
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245 | & grid_center_lon(ocn_add) = grid_center_lon(ocn_add) + pi2 |
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246 | end do |
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247 | |
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248 | !----------------------------------------------------------------------- |
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249 | ! |
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250 | ! compute cell areas in same way as POP |
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251 | ! |
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252 | !----------------------------------------------------------------------- |
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253 | |
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254 | n = 0 |
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255 | do j=1,ny |
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256 | if (j > 1) then |
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257 | jm1 = j-1 |
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258 | else |
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259 | jm1 = 1 |
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260 | endif |
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261 | do i=1,nx |
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262 | if (i > 1) then |
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263 | im1 = i-1 |
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264 | else |
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265 | im1 = nx |
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266 | endif |
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267 | |
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268 | n = n+1 |
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269 | |
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270 | dxt = half*(HTN(i,j) + HTN(i,jm1)) |
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271 | dyt = half*(HTE(i,j) + HTE(im1,j)) |
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272 | if (dxt == zero) dxt=one |
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273 | if (dyt == zero) dyt=one |
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274 | |
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275 | grid_area(n) = dxt*dyt*area_norm |
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276 | end do |
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277 | end do |
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278 | |
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279 | !----------------------------------------------------------------------- |
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280 | ! |
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281 | ! set up attributes for netCDF file |
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282 | ! |
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283 | !----------------------------------------------------------------------- |
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284 | |
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285 | !*** |
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286 | !*** create netCDF dataset for this grid |
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287 | !*** |
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288 | |
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289 | ncstat = nf_create (grid_file_out, NF_CLOBBER, |
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290 | & nc_grid_id) |
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291 | call netcdf_error_handler(ncstat) |
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292 | |
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293 | ncstat = nf_put_att_text (nc_grid_id, NF_GLOBAL, 'title', |
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294 | & len_trim(grid_name), grid_name) |
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295 | call netcdf_error_handler(ncstat) |
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296 | |
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297 | !*** |
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298 | !*** define grid size dimension |
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299 | !*** |
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300 | |
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301 | ncstat = nf_def_dim (nc_grid_id, 'grid_size', grid_size, |
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302 | & nc_gridsize_id) |
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303 | call netcdf_error_handler(ncstat) |
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304 | |
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305 | !*** |
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306 | !*** define grid rank dimension |
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307 | !*** |
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308 | |
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309 | ncstat = nf_def_dim (nc_grid_id, 'grid_rank', grid_rank, |
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310 | & nc_gridrank_id) |
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311 | call netcdf_error_handler(ncstat) |
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312 | |
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313 | !*** |
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314 | !*** define grid corner dimension |
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315 | !*** |
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316 | |
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317 | ncstat = nf_def_dim (nc_grid_id, 'grid_corners', grid_corners, |
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318 | & nc_gridcorn_id) |
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319 | call netcdf_error_handler(ncstat) |
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320 | |
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321 | !*** |
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322 | !*** define grid dim size array |
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323 | !*** |
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324 | |
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325 | ncstat = nf_def_var (nc_grid_id, 'grid_dims', NF_INT, |
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326 | & 1, nc_gridrank_id, nc_griddims_id) |
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327 | call netcdf_error_handler(ncstat) |
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328 | |
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329 | !*** |
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330 | !*** define grid center latitude array |
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331 | !*** |
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332 | |
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333 | ncstat = nf_def_var (nc_grid_id, 'grid_center_lat', NF_DOUBLE, |
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334 | & 1, nc_gridsize_id, nc_grdcntrlat_id) |
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335 | call netcdf_error_handler(ncstat) |
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336 | |
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337 | ncstat = nf_put_att_text (nc_grid_id, nc_grdcntrlat_id, 'units', |
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338 | & 7, 'radians') |
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339 | call netcdf_error_handler(ncstat) |
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340 | |
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341 | !*** |
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342 | !*** define grid center longitude array |
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343 | !*** |
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344 | |
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345 | ncstat = nf_def_var (nc_grid_id, 'grid_center_lon', NF_DOUBLE, |
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346 | & 1, nc_gridsize_id, nc_grdcntrlon_id) |
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347 | call netcdf_error_handler(ncstat) |
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348 | |
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349 | ncstat = nf_put_att_text (nc_grid_id, nc_grdcntrlon_id, 'units', |
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350 | & 7, 'radians') |
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351 | call netcdf_error_handler(ncstat) |
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352 | |
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353 | !*** |
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354 | !*** define grid area array |
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355 | !*** |
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356 | |
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357 | ncstat = nf_def_var (nc_grid_id, 'grid_area', NF_DOUBLE, |
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358 | & 1, nc_gridsize_id, nc_gridarea_id) |
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359 | call netcdf_error_handler(ncstat) |
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360 | |
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361 | !*** |
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362 | !*** define grid mask |
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363 | !*** |
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364 | |
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365 | ncstat = nf_def_var (nc_grid_id, 'grid_imask', NF_INT, |
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366 | & 1, nc_gridsize_id, nc_grdimask_id) |
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367 | call netcdf_error_handler(ncstat) |
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368 | |
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369 | ncstat = nf_put_att_text (nc_grid_id, nc_grdimask_id, 'units', |
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370 | & 8, 'unitless') |
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371 | call netcdf_error_handler(ncstat) |
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372 | |
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373 | !*** |
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374 | !*** define grid corner latitude array |
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375 | !*** |
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376 | |
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377 | nc_dims2_id(1) = nc_gridcorn_id |
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378 | nc_dims2_id(2) = nc_gridsize_id |
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379 | |
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380 | ncstat = nf_def_var (nc_grid_id, 'grid_corner_lat', NF_DOUBLE, |
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381 | & 2, nc_dims2_id, nc_grdcrnrlat_id) |
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382 | call netcdf_error_handler(ncstat) |
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383 | |
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384 | ncstat = nf_put_att_text (nc_grid_id, nc_grdcrnrlat_id, 'units', |
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385 | & 7, 'radians') |
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386 | call netcdf_error_handler(ncstat) |
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387 | |
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388 | !*** |
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389 | !*** define grid corner longitude array |
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390 | !*** |
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391 | |
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392 | ncstat = nf_def_var (nc_grid_id, 'grid_corner_lon', NF_DOUBLE, |
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393 | & 2, nc_dims2_id, nc_grdcrnrlon_id) |
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394 | call netcdf_error_handler(ncstat) |
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395 | |
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396 | ncstat = nf_put_att_text (nc_grid_id, nc_grdcrnrlon_id, 'units', |
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397 | & 7, 'radians') |
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398 | call netcdf_error_handler(ncstat) |
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399 | |
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400 | !*** |
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401 | !*** end definition stage |
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402 | !*** |
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403 | |
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404 | ncstat = nf_enddef(nc_grid_id) |
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405 | call netcdf_error_handler(ncstat) |
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406 | |
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407 | !----------------------------------------------------------------------- |
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408 | ! |
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409 | ! write grid data |
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410 | ! |
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411 | !----------------------------------------------------------------------- |
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412 | |
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413 | ncstat = nf_put_var_int(nc_grid_id, nc_griddims_id, grid_dims) |
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414 | call netcdf_error_handler(ncstat) |
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415 | |
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416 | ncstat = nf_put_var_double(nc_grid_id, nc_grdcntrlat_id, |
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417 | & grid_center_lat) |
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418 | ncstat = nf_put_var_int(nc_grid_id, nc_grdimask_id, grid_imask) |
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419 | call netcdf_error_handler(ncstat) |
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420 | |
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421 | ncstat = nf_put_var_double(nc_grid_id, nc_gridarea_id, |
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422 | & grid_area) |
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423 | call netcdf_error_handler(ncstat) |
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424 | |
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425 | ncstat = nf_put_var_double(nc_grid_id, nc_grdcntrlat_id, |
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426 | & grid_center_lat) |
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427 | call netcdf_error_handler(ncstat) |
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428 | |
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429 | ncstat = nf_put_var_double(nc_grid_id, nc_grdcntrlon_id, |
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430 | & grid_center_lon) |
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431 | call netcdf_error_handler(ncstat) |
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432 | |
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433 | ncstat = nf_put_var_double(nc_grid_id, nc_grdcrnrlat_id, |
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434 | & grid_corner_lat) |
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435 | call netcdf_error_handler(ncstat) |
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436 | |
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437 | ncstat = nf_put_var_double(nc_grid_id, nc_grdcrnrlon_id, |
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438 | & grid_corner_lon) |
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439 | call netcdf_error_handler(ncstat) |
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440 | |
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441 | ncstat = nf_close(nc_grid_id) |
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442 | |
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443 | !*********************************************************************** |
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444 | |
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445 | end program convertPOPT |
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446 | |
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447 | !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! |
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