1 | |
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2 | !! This module define variables for the grid to gathered points. |
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3 | !! |
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4 | !! @call sechiba_main |
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5 | !! @Version : $Revision$, $Date$ |
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6 | !! |
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7 | !< $HeadURL$ |
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8 | !< $Date$ |
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9 | !< $Author$ |
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10 | !< $Revision$ |
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11 | !! |
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12 | !! @author Marie-Alice Foujols, Jan Polcher and Martial Mancip |
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13 | !! |
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14 | !! |
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15 | !f90doc MODULEgrid |
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16 | MODULE grid |
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17 | |
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18 | USE defprec |
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19 | USE constantes |
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20 | USE mod_orchidee_para |
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21 | |
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22 | IMPLICIT NONE |
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23 | |
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24 | ! |
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25 | ! PARAMETERS |
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26 | ! default resolution (m) |
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27 | REAL(r_std), PARAMETER :: default_resolution = 250000. |
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28 | ! |
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29 | ! VARIABLES |
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30 | ! |
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31 | ! Global map or not. |
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32 | ! There is little change that if iim <=2 and jjm <= 2 that we have global grid. |
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33 | ! Furthermore using the second line allows to avoid pole problems for global grids |
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34 | LOGICAL, SAVE :: global = .TRUE. |
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35 | !$OMP THREADPRIVATE(global) |
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36 | ! |
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37 | !- |
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38 | !- Variable to help describe the grid |
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39 | !- once the points are gathered. |
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40 | !- |
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41 | !! Limits of the domain |
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42 | REAL(r_std), SAVE :: limit_west, limit_east, & |
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43 | & limit_north, limit_south |
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44 | !$OMP THREADPRIVATE(limit_west, limit_east, limit_north, limit_south) |
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45 | !- |
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46 | !! Geographical coordinates |
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47 | REAL(r_std), ALLOCATABLE, DIMENSION (:,:), SAVE :: lalo |
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48 | !$OMP THREADPRIVATE(lalo) |
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49 | !! index of land points |
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50 | INTEGER, ALLOCATABLE, DIMENSION (:), SAVE :: ilandindex,jlandindex |
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51 | !$OMP THREADPRIVATE(ilandindex, jlandindex) |
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52 | !- |
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53 | !! Fraction of continents. |
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54 | REAL(r_std), ALLOCATABLE, DIMENSION (:), SAVE :: contfrac |
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55 | !$OMP THREADPRIVATE(contfrac) |
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56 | ! |
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57 | ! indices of the 4 neighbours of each grid point (1=N, 2=E, 3=S, 4=W) |
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58 | ! a zero or negative index means that this neighbour is not a land point |
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59 | INTEGER(i_std), ALLOCATABLE, DIMENSION (:,:), SAVE :: neighbours |
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60 | !$OMP THREADPRIVATE(neighbours) |
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61 | ! |
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62 | ! resolution at each grid point in m (1=E-W, 2=N-S) |
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63 | ! (size in x an y of the grid) |
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64 | REAL(r_std), ALLOCATABLE, DIMENSION (:,:), SAVE :: resolution |
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65 | !$OMP THREADPRIVATE(resolution) |
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66 | REAL(r_std), DIMENSION(2), SAVE :: min_resol,max_resol |
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67 | !$OMP THREADPRIVATE(min_resol, max_resol) |
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68 | REAL(r_std), ALLOCATABLE, DIMENSION (:), SAVE :: area |
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69 | !$OMP THREADPRIVATE(area) |
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70 | ! |
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71 | ! |
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72 | ! Get the direction of the grid |
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73 | ! |
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74 | CHARACTER(LEN=2), DIMENSION(2), SAVE, PRIVATE :: grid_dir |
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75 | !$OMP THREADPRIVATE(grid_dir) |
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76 | ! |
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77 | ! Rose gives the geographical direction for the various index increments |
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78 | ! The following corespondences exist |
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79 | ! WE&NS WE&SN and so on ! |
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80 | ! rose(1) = i+0 & j-1 NN SS |
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81 | ! rose(2) = i+1 & j-1 NE SE |
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82 | ! rose(3) = i+1 & j+0 EE EE |
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83 | ! rose(4) = i+1 & j+1 SE NE |
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84 | ! rose(5) = i+0 & j+1 SS NN |
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85 | ! rose(6) = i-1 & j+1 SW NW |
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86 | ! rose(7) = i-1 & j+0 WW WW |
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87 | ! rose(8) = i-1 & j-1 NW SW |
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88 | INTEGER(i_std), DIMENSION(8), SAVE, PRIVATE :: rose |
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89 | !$OMP THREADPRIVATE(rose) |
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90 | ! |
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91 | ! The calendar |
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92 | CHARACTER(LEN=20), SAVE :: calendar_str |
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93 | !$OMP THREADPRIVATE(calendar_str) |
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94 | ! |
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95 | ! The date |
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96 | REAL(r_std), SAVE :: in_julian |
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97 | !$OMP THREADPRIVATE(in_julian) |
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98 | ! Diff with day 0 |
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99 | REAL(r_std), SAVE :: julian_diff |
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100 | !$OMP THREADPRIVATE(julian_diff) |
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101 | ! |
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102 | INTEGER(i_std), SAVE :: year, month, day |
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103 | !$OMP THREADPRIVATE(year, month, day) |
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104 | REAL(r_std), SAVE :: sec |
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105 | !$OMP THREADPRIVATE(sec) |
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106 | ! |
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107 | ! month_len (d) |
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108 | INTEGER(i_std), SAVE :: month_len |
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109 | !$OMP THREADPRIVATE(month_len) |
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110 | ! |
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111 | ! year length (d) |
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112 | INTEGER(i_std), SAVE :: year_length=0 |
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113 | !$OMP THREADPRIVATE(year_length) |
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114 | ! |
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115 | ! Ration between calendar year in days (ie 360d or 365d ...) to gregorian year length |
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116 | REAL(r_std), SAVE :: year_spread |
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117 | !$OMP THREADPRIVATE(year_spread) |
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118 | ! |
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119 | CONTAINS |
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120 | ! |
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121 | !f90doc CONTAINS |
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122 | ! |
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123 | ! |
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124 | SUBROUTINE init_grid ( npts ) |
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125 | ! |
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126 | ! 0 interface |
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127 | ! |
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128 | IMPLICIT NONE |
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129 | ! |
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130 | ! 0.1 input ! |
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131 | |
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132 | ! Domain size |
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133 | INTEGER(i_std), INTENT(in) :: npts !! Number of local continental points |
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134 | ! |
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135 | ! Create the internal coordinate table |
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136 | ! |
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137 | IF ( (.NOT.ALLOCATED(lalo))) THEN |
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138 | ALLOCATE(lalo(npts,2)) |
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139 | lalo(:,:) = val_exp |
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140 | ENDIF |
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141 | !- |
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142 | !- Store variable to help describe the grid |
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143 | !- once the points are gathered. |
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144 | !- |
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145 | IF ( (.NOT.ALLOCATED(neighbours))) THEN |
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146 | ALLOCATE(neighbours(npts,8)) |
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147 | neighbours(:,:) = -999999 |
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148 | ENDIF |
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149 | IF ( (.NOT.ALLOCATED(resolution))) THEN |
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150 | ALLOCATE(resolution(npts,2)) |
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151 | resolution(:,:) = val_exp |
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152 | ENDIF |
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153 | IF ( (.NOT.ALLOCATED(area))) THEN |
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154 | ALLOCATE(area(npts)) |
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155 | area(:) = val_exp |
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156 | ENDIF |
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157 | ! |
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158 | !- Store the fraction of the continents only once so that the user |
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159 | !- does not change them afterwards. |
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160 | ! |
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161 | IF ( (.NOT.ALLOCATED(contfrac))) THEN |
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162 | ALLOCATE(contfrac(npts)) |
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163 | contfrac(:) = val_exp |
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164 | ENDIF |
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165 | ! |
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166 | ! Allocation of index coordinates |
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167 | IF (.NOT. ALLOCATED(ilandindex)) THEN |
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168 | ALLOCATE(ilandindex(npts),jlandindex(npts)) |
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169 | ilandindex(:) = -10000000 |
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170 | jlandindex(:) = -10000000 |
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171 | ENDIF |
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172 | ! |
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173 | END SUBROUTINE init_grid |
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174 | |
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175 | SUBROUTINE grid_stuff (npts_glo, iim, jjm, grid_lon, grid_lat, kindex) |
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176 | ! |
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177 | ! 0 interface |
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178 | ! |
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179 | IMPLICIT NONE |
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180 | ! |
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181 | ! 0.1 input ! |
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182 | |
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183 | ! Domain size |
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184 | INTEGER(i_std), INTENT(in) :: npts_glo |
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185 | ! Size of cartesian grid |
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186 | INTEGER(i_std), INTENT(in) :: iim, jjm |
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187 | ! Longitudes on cartesian grid |
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188 | REAL(r_std), DIMENSION(iim,jjm), INTENT(in) :: grid_lon |
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189 | ! Latitudes on cartesian grid |
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190 | REAL(r_std), DIMENSION(iim,jjm), INTENT(in) :: grid_lat |
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191 | ! Index of land point on 2D map (in local position) |
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192 | INTEGER(i_std), DIMENSION(:), INTENT(in) :: kindex |
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193 | ! |
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194 | ! 0.3 local |
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195 | ! |
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196 | ! Index of land point on 2D map (in global position) |
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197 | INTEGER, ALLOCATABLE, DIMENSION (:) :: index_p |
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198 | ! |
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199 | ! which STOMATE point corresponds to the given point on the cartesian grid |
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200 | INTEGER(i_std), DIMENSION(iim,jjm) :: correspondance |
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201 | ! cosine of the latitude |
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202 | REAL(r_std) :: coslat |
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203 | ! number of points where default resolution is used |
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204 | INTEGER(i_std) :: ndefault_lon, ndefault_lat |
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205 | ! Indices |
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206 | INTEGER(i_std) :: i,ip,jp, imm1, imp1, imm1l, imp1l, ii |
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207 | ! |
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208 | INTEGER(i_std), SAVE :: bavard=2 |
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209 | !$OMP THREADPRIVATE(bavard) |
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210 | |
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211 | ! ========================================================================= |
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212 | |
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213 | IF ( bavard .GE. 4 ) WRITE(numout,*) 'Entering grid_stuff' |
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214 | |
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215 | ! default resolution |
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216 | IF ( bavard .GT. 1 ) WRITE(numout,*) 'grid stuff: default resolution (m): ',default_resolution |
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217 | ! |
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218 | !- |
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219 | IF (is_root_prc) THEN |
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220 | ! Check if we have a global map or not. |
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221 | ! There is little change that if iim <=2 and jjm <= 2 that we have global grid. |
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222 | ! Furthermore using the second line allows to avoid pole problems for global grids |
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223 | IF (iim <= 2 .OR. jjm <= 2) THEN |
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224 | global = .FALSE. |
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225 | ELSE |
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226 | ! We assume here that the longitude is in increasing order and in degrees. |
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227 | IF ( grid_lon(iim,2)-grid_lon(1,2) >= 360. - (grid_lon(2,2)-grid_lon(1,2)) ) THEN |
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228 | global = .TRUE. |
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229 | ELSE |
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230 | global = .FALSE. |
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231 | ENDIF |
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232 | ENDIF |
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233 | ! |
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234 | ! Get the direction of the grid |
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235 | ! |
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236 | IF ( iim > 1 ) THEN |
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237 | IF ( grid_lon(1,1) <= grid_lon(2,1) ) THEN |
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238 | grid_dir(1) = 'WE' |
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239 | ELSE |
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240 | grid_dir(1) = 'EW' |
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241 | ENDIF |
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242 | ELSE |
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243 | grid_dir(1) = 'WE' |
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244 | ENDIF |
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245 | ! |
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246 | IF ( jjm > 1 ) THEN |
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247 | IF ( grid_lat(1,1) >= grid_lat(1,2) ) THEN |
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248 | grid_dir(2) = 'NS' |
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249 | ELSE |
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250 | grid_dir(2) = 'SN' |
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251 | ENDIF |
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252 | ELSE |
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253 | grid_dir(2) = 'NS' |
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254 | ENDIF |
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255 | ! |
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256 | !! WRITE(numout,*) 'Longitude direction :', grid_dir(1) |
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257 | !! WRITE(numout,*) 'Latitude direction :', grid_dir(2) |
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258 | ! |
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259 | ndefault_lon = 0 |
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260 | ndefault_lat = 0 |
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261 | ! initialize output |
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262 | neighbours_g(:,:) = -1 |
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263 | resolution_g(:,:) = zero |
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264 | min_resol(:) = 1.e6 |
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265 | max_resol(:) = moins_un |
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266 | |
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267 | correspondance(:,:) = -1 |
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268 | DO i = 1, npts_glo |
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269 | ! |
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270 | ! 1 find numbers of the latitude and longitude of each point |
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271 | ! |
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272 | |
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273 | ! index of latitude |
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274 | jp = INT( (index_g(i)-1) /iim ) + 1 |
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275 | |
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276 | ! index of longitude |
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277 | ip = index_g(i) - ( jp-1 ) * iim |
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278 | ! |
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279 | !correspondance(ip,jp) = kindex(i) |
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280 | ! |
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281 | correspondance(ip,jp) = i |
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282 | |
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283 | ENDDO |
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284 | |
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285 | ! |
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286 | ! Get the "wind rose" for the various orientation of the grid |
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287 | ! |
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288 | IF ( grid_dir(1) .EQ. 'WE' .AND. grid_dir(2) .EQ. 'NS' ) THEN |
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289 | rose(1) = 1 |
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290 | rose(2) = 2 |
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291 | rose(3) = 3 |
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292 | rose(4) = 4 |
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293 | rose(5) = 5 |
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294 | rose(6) = 6 |
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295 | rose(7) = 7 |
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296 | rose(8) = 8 |
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297 | ELSE IF ( grid_dir(1) .EQ. 'EW' .AND. grid_dir(2) .EQ. 'NS' ) THEN |
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298 | rose(1) = 1 |
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299 | rose(2) = 8 |
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300 | rose(3) = 7 |
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301 | rose(4) = 6 |
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302 | rose(5) = 5 |
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303 | rose(6) = 4 |
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304 | rose(7) = 3 |
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305 | rose(8) = 2 |
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306 | ELSE IF ( grid_dir(1) .EQ. 'WE' .AND. grid_dir(2) .EQ. 'SN' ) THEN |
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307 | rose(1) = 5 |
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308 | rose(2) = 4 |
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309 | rose(3) = 3 |
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310 | rose(4) = 2 |
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311 | rose(5) = 1 |
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312 | rose(6) = 8 |
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313 | rose(7) = 7 |
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314 | rose(8) = 6 |
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315 | ELSE IF ( grid_dir(1) .EQ. 'EW' .AND. grid_dir(2) .EQ. 'SN' ) THEN |
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316 | rose(1) = 5 |
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317 | rose(2) = 6 |
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318 | rose(3) = 7 |
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319 | rose(4) = 8 |
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320 | rose(5) = 1 |
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321 | rose(6) = 2 |
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322 | rose(7) = 3 |
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323 | rose(8) = 4 |
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324 | ELSE |
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325 | WRITE(numout,*) 'We can not be here' |
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326 | STOP 'grid_stuff' |
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327 | ENDIF |
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328 | |
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329 | DO i = 1, npts_glo |
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330 | |
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331 | ! index of latitude |
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332 | jp = INT( (index_g(i)-1) /iim ) + 1 |
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333 | |
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334 | ! index of longitude |
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335 | ip = index_g(i) - ( jp-1 ) * iim |
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336 | |
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337 | ! |
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338 | ! 2 resolution |
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339 | ! |
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340 | |
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341 | ! |
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342 | ! 2.1 longitude |
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343 | ! |
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344 | |
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345 | ! prevent infinite resolution at the pole |
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346 | coslat = MAX( COS( grid_lat(ip,jp) * pi/180. ), mincos ) |
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347 | IF ( iim .GT. 1 ) THEN |
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348 | |
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349 | IF ( ip .EQ. 1 ) THEN |
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350 | resolution_g(i,1) = & |
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351 | ABS( grid_lon(ip+1,jp) - grid_lon(ip,jp) ) * & |
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352 | pi/180. * R_Earth * coslat |
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353 | ELSEIF ( ip .EQ. iim ) THEN |
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354 | resolution_g(i,1) = & |
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355 | ABS( grid_lon(ip,jp) - grid_lon(ip-1,jp) ) * & |
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356 | pi/180. * R_Earth * coslat |
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357 | ELSE |
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358 | resolution_g(i,1) = & |
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359 | ABS( grid_lon(ip+1,jp) - grid_lon(ip-1,jp) )/2. *& |
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360 | pi/180. * R_Earth * coslat |
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361 | ENDIF |
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362 | |
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363 | ELSE |
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364 | |
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365 | resolution_g(i,1) = default_resolution |
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366 | |
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367 | ndefault_lon = ndefault_lon + 1 |
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368 | |
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369 | ENDIF |
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370 | |
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371 | ! |
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372 | ! 2.2 latitude |
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373 | ! |
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374 | |
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375 | IF ( jjm .GT. 1 ) THEN |
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376 | |
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377 | IF ( jp .EQ. 1 ) THEN |
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378 | resolution_g(i,2) = & |
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379 | ABS( grid_lat(ip,jp) - grid_lat(ip,jp+1) ) * & |
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380 | pi/180. * R_Earth |
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381 | ELSEIF ( jp .EQ. jjm ) THEN |
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382 | resolution_g(i,2) = & |
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383 | ABS( grid_lat(ip,jp-1) - grid_lat(ip,jp) ) * & |
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384 | pi/180. * R_Earth |
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385 | ELSE |
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386 | resolution_g(i,2) = & |
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387 | ABS( grid_lat(ip,jp-1) - grid_lat(ip,jp+1) )/2. *& |
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388 | pi/180. * R_Earth |
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389 | ENDIF |
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390 | |
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391 | ELSE |
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392 | |
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393 | resolution_g(i,2) = default_resolution |
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394 | |
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395 | ndefault_lat = ndefault_lat + 1 |
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396 | |
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397 | ENDIF |
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398 | min_resol(1) = MIN(resolution_g(i,1),min_resol(1)) |
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399 | min_resol(2) = MIN(resolution_g(i,2),min_resol(2)) |
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400 | max_resol(1) = MAX(resolution_g(i,1),max_resol(1)) |
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401 | max_resol(2) = MAX(resolution_g(i,2),max_resol(2)) |
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402 | |
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403 | area_g(i) = resolution_g(i,1)*resolution_g(i,2) |
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404 | |
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405 | ! |
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406 | ! 3 find neighbours |
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407 | ! |
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408 | imm1 = 0 |
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409 | IF ( ip .GT. 1 ) THEN |
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410 | imm1 = ip - 1 |
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411 | ELSEIF ( global ) THEN |
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412 | imm1 = iim |
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413 | ENDIF |
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414 | |
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415 | imp1 = 0 |
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416 | IF ( ip .LT. iim ) THEN |
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417 | imp1 = ip + 1 |
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418 | ELSEIF ( global ) THEN |
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419 | imp1 = 1 |
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420 | ENDIF |
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421 | ! |
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422 | ! East and West |
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423 | ! |
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424 | IF ( imp1 > 0 ) THEN |
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425 | neighbours_g(i,rose(3)) = correspondance(imp1,jp) |
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426 | ELSE |
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427 | neighbours_g(i,rose(3)) = -1 |
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428 | ENDIF |
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429 | IF ( imm1 > 0 ) THEN |
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430 | neighbours_g(i,rose(7)) = correspondance(imm1,jp) |
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431 | ELSE |
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432 | neighbours_g(i,rose(7)) = -1 |
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433 | ENDIF |
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434 | ! |
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435 | ! North |
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436 | ! |
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437 | IF ( jp .GT. 1 ) THEN |
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438 | |
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439 | neighbours_g(i,rose(1)) = correspondance(ip,jp-1) |
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440 | IF ( imp1 > 0 ) THEN |
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441 | neighbours_g(i,rose(2)) = correspondance(imp1,jp-1) |
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442 | ELSE |
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443 | neighbours_g(i,rose(2)) = -1 |
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444 | ENDIF |
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445 | IF ( imm1 > 0 ) THEN |
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446 | neighbours_g(i,rose(8)) = correspondance(imm1,jp-1) |
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447 | ELSE |
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448 | neighbours_g(i,rose(8)) = -1 |
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449 | ENDIF |
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450 | |
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451 | ELSE |
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452 | IF ( global ) THEN |
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453 | |
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454 | ! special treatment for the pole if we are really in a 2d grid |
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455 | |
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456 | IF ( ( iim .GT. 1 ) .AND. ( jjm .GT. 1 ) ) THEN |
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457 | ! |
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458 | ii = MOD(ip+iim/2-1,iim)+1 |
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459 | imm1l = ii - 1 |
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460 | IF ( imm1l .LT. 1 ) imm1l = iim |
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461 | imp1l = ii + 1 |
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462 | IF ( imp1l .GT. iim ) imp1l = 1 |
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463 | ! |
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464 | IF ( ABS( ( grid_lat(ip,jp) ) - 90. ) .LT. min_sechiba ) THEN |
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465 | ! the grid point sits exactly on the pole. The neighbour is situated |
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466 | ! at a lower latitude. |
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467 | neighbours_g(i,rose(1)) = correspondance( ii, jp+1 ) |
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468 | neighbours_g(i,rose(2)) = correspondance( imm1l, jp+1 ) |
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469 | neighbours_g(i,rose(8)) = correspondance( imp1l, jp+1 ) |
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470 | ELSE |
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471 | ! look across the North Pole |
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472 | neighbours_g(i,rose(1)) = correspondance( ii, jp ) |
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473 | neighbours_g(i,rose(2)) = correspondance( imm1l, jp ) |
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474 | neighbours_g(i,rose(8)) = correspondance( imp1l, jp ) |
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475 | ENDIF |
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476 | ENDIF |
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477 | |
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478 | ELSE |
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479 | |
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480 | neighbours_g(i,rose(1)) = -1 |
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481 | neighbours_g(i,rose(2)) = -1 |
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482 | neighbours_g(i,rose(8)) = -1 |
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483 | |
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484 | ENDIF |
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485 | |
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486 | ENDIF |
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487 | |
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488 | ! South |
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489 | IF ( jp .LT. jjm ) THEN |
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490 | |
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491 | neighbours_g(i,rose(5)) = correspondance(ip,jp+1) |
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492 | IF ( imp1 > 0 ) THEN |
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493 | neighbours_g(i,rose(4)) = correspondance(imp1,jp+1) |
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494 | ELSE |
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495 | neighbours_g(i,rose(4)) = -1 |
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496 | ENDIF |
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497 | IF ( imm1 > 0 ) THEN |
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498 | neighbours_g(i,rose(6)) = correspondance(imm1,jp+1) |
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499 | ELSE |
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500 | neighbours_g(i,rose(6)) = -1 |
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501 | ENDIF |
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502 | |
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503 | ELSE |
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504 | |
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505 | IF ( global ) THEN |
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506 | |
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507 | ! special treatment for the pole if we are really in a 2d grid |
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508 | |
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509 | IF ( ( iim .GT. 1 ) .AND. ( jjm .GT. 1 ) ) THEN |
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510 | ! |
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511 | ii = MOD(ip+iim/2-1,iim)+1 |
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512 | imm1l = ii - 1 |
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513 | IF ( imm1l .LT. 1 ) imm1l = iim |
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514 | imp1l = ii + 1 |
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515 | IF ( imp1l .GT. iim ) imp1l = 1 |
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516 | ! |
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517 | IF ( ( ABS( grid_lat(ip,jp) ) - 90. ) .LT. min_sechiba ) THEN |
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518 | ! the grid point sits exactly on the pole. The neighbour is situated |
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519 | ! at a lower latitude. |
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520 | neighbours_g(i,rose(5)) = correspondance( ii, jp-1 ) |
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521 | neighbours_g(i,rose(4)) = correspondance( imm1l, jp-1 ) |
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522 | neighbours_g(i,rose(6)) = correspondance( imp1l, jp-1 ) |
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523 | ELSE |
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524 | ! look across the South Pole |
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525 | neighbours_g(i,rose(5)) = correspondance( ii, jp ) |
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526 | neighbours_g(i,rose(4)) = correspondance( imm1l, jp ) |
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527 | neighbours_g(i,rose(6)) = correspondance( imp1l, jp ) |
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528 | ENDIF |
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529 | ENDIF |
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530 | |
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531 | ELSE |
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532 | |
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533 | neighbours_g(i,rose(5)) = -1 |
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534 | neighbours_g(i,rose(4)) = -1 |
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535 | neighbours_g(i,rose(6)) = -1 |
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536 | |
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537 | ENDIF |
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538 | ENDIF |
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539 | |
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540 | ENDDO |
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541 | |
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542 | IF ( bavard .GT. 1 ) THEN |
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543 | WRITE(numout,*) ' > Total number of points: ',npts_glo |
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544 | WRITE(numout,*) ' > Using default zonal resolution at',ndefault_lon,' points.' |
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545 | WRITE(numout,*) ' > Using default meridional resolution at',ndefault_lat,' points.' |
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546 | ENDIF |
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547 | ! |
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548 | ENDIF ! (root_prc) |
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549 | |
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550 | CALL scatter(neighbours_g,neighbours) |
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551 | CALL scatter(resolution_g,resolution) |
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552 | CALL scatter(area_g,area) |
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553 | CALL bcast(min_resol) |
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554 | CALL bcast(max_resol) |
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555 | IF ( bavard .EQ. 5 ) THEN |
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556 | WRITE(numout,*) ' > resolution = ',resolution |
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557 | WRITE(numout,*) ' > rose = ',rose |
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558 | WRITE(numout,*) ' > neighbours = ',neighbours |
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559 | ENDIF |
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560 | IF ( bavard .GT. 1 ) WRITE(numout,*) 'Leaving grid_stuff' |
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561 | |
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562 | END SUBROUTINE grid_stuff |
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563 | ! |
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564 | !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! |
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565 | |
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566 | END MODULE grid |
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