1 | !!---------------------------------------------------------------------- |
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2 | !! NEMO/OPA 3.3 , NEMO Consortium (2010) |
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3 | !! $Id: obssst_io.h90 2287 2010-10-18 07:53:52Z smasson $ |
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4 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
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5 | !!---------------------------------------------------------------------- |
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6 | |
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7 | SUBROUTINE read_ghrsst( cdfilename, inpfile, kunit, ldwp, ldgrid ) |
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8 | !!--------------------------------------------------------------------- |
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9 | !! |
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10 | !! ** ROUTINE read_ghrsst ** |
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11 | !! |
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12 | !! ** Purpose : Read from file the GHRSST observations. |
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13 | !! |
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14 | !! ** Method : The data file is a NetCDF file. |
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15 | !! |
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16 | !! ** Action : |
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17 | !! |
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18 | !! References : |
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19 | !! |
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20 | !! History : |
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21 | !! ! 09-01 (K. Mogensen) Original based on old versions |
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22 | !!---------------------------------------------------------------------- |
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23 | !! * Arguments |
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24 | CHARACTER(LEN=*) :: cdfilename ! Input filename |
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25 | TYPE(obfbdata) :: inpfile ! Output obfbdata structure |
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26 | INTEGER :: kunit ! Unit for output |
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27 | LOGICAL :: ldwp ! Print info |
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28 | LOGICAL :: ldgrid ! Save grid info in data structure |
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29 | !! * Local declarations |
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30 | CHARACTER(LEN=12),PARAMETER :: cpname = 'read_ghrsst' |
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31 | INTEGER :: i_file_id ! netcdf IDS |
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32 | INTEGER :: i_time_id |
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33 | INTEGER :: i_ni_id |
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34 | INTEGER :: i_data_id |
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35 | INTEGER :: i_var_id |
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36 | INTEGER :: i_data ! Number of data per parameter in current file |
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37 | INTEGER :: i_time ! Number of reference times in file |
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38 | INTEGER, DIMENSION(:), POINTER :: & |
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39 | & i_reftime ! Reference time in file in seconds since 1/1/1981. |
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40 | INTEGER, DIMENSION(:,:), POINTER :: & |
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41 | & i_dtime, & ! Offset in seconds since reference time |
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42 | & i_qc, & ! Quality control flag. |
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43 | & i_type ! Type of SST measurement. |
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44 | REAL(wp), DIMENSION(:), POINTER :: & |
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45 | & z_phi, & ! Latitudes |
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46 | & z_lam ! Longitudes |
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47 | REAL(wp), DIMENSION(:,:), POINTER :: & |
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48 | & z_sst ! SST data |
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49 | INTEGER, PARAMETER :: imaxdim = 2 ! Assumed maximum for no. dims. in file |
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50 | INTEGER, DIMENSION(2) :: idims ! Dimensions in file |
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51 | INTEGER :: iilen ! Length of netCDF attributes |
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52 | INTEGER :: itype ! Typeof netCDF attributes |
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53 | REAL(KIND=wp) :: zsca ! Scale factor |
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54 | REAL(KIND=wp) :: zoff ! Offset for data in netcdf file |
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55 | REAL(KIND=wp) :: z_offset ! Offset for time conversion |
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56 | REAL(KIND=wp) :: zfill ! Fill value in netcdf file |
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57 | CHARACTER (len=33) :: creftime ! Reference time of file |
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58 | INTEGER :: i_refyear ! Integer version of reference time |
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59 | INTEGER :: i_refmonth |
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60 | INTEGER :: i_refday |
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61 | INTEGER :: i_refhour |
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62 | INTEGER :: i_refmin |
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63 | INTEGER :: i_refsec |
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64 | INTEGER :: ichunk |
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65 | INTEGER :: jtim |
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66 | INTEGER :: jobs |
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67 | INTEGER :: iobs |
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68 | |
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69 | CALL chkerr( nf90_open( TRIM( cdfilename ), nf90_nowrite, & |
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70 | & i_file_id, chunksize=ichunk), cpname, __LINE__ ) |
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71 | |
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72 | ! Get the netCDF dimensions |
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73 | |
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74 | CALL chkerr( nf90_inq_dimid( i_file_id, 'time', i_time_id ), & |
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75 | & cpname, __LINE__ ) |
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76 | CALL chkerr( nf90_inquire_dimension( i_file_id, i_time_id, & |
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77 | & len = i_time ), & |
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78 | & cpname, __LINE__ ) |
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79 | |
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80 | CALL chkerr( nf90_inq_dimid( i_file_id, 'ni', i_ni_id ), & |
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81 | & cpname, __LINE__ ) |
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82 | CALL chkerr( nf90_inquire_dimension( i_file_id, i_ni_id, & |
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83 | & len = i_data ), & |
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84 | & cpname, __LINE__ ) |
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85 | |
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86 | |
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87 | ! Allocate NetCDF variables |
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88 | |
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89 | ALLOCATE( & |
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90 | & i_reftime ( i_time ), & |
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91 | & i_dtime ( i_data,i_time ), & |
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92 | & i_qc ( i_data,i_time ), & |
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93 | & i_type ( i_data,i_time ), & |
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94 | & z_phi ( i_data ), & |
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95 | & z_lam ( i_data ), & |
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96 | & z_sst ( i_data,i_time ) & |
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97 | & ) |
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98 | |
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99 | ! Get reference time of file which is in seconds since 1981/1/1 00:00. |
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100 | |
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101 | CALL chkerr( nf90_inq_varid( i_file_id, 'time', i_var_id ), & |
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102 | & cpname, __LINE__ ) |
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103 | idims(1) = i_time |
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104 | CALL chkdim( i_file_id, i_var_id, 1, idims, cpname, __LINE__ ) |
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105 | CALL chkerr( nf90_get_var ( i_file_id, i_var_id, i_reftime),& |
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106 | & cpname, __LINE__ ) |
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107 | IF (nf90_inquire_attribute( i_file_id, i_var_id, "units") & |
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108 | & == nf90_noerr) THEN |
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109 | CALL chkerr( nf90_get_att( i_file_id, i_var_id, & |
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110 | & "units",creftime), cpname, __LINE__ ) |
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111 | ELSE |
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112 | creftime = "seconds since 1981-01-01 00:00:00" |
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113 | ENDIF |
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114 | READ(creftime(15:18),*)i_refyear |
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115 | READ(creftime(20:21),*)i_refmonth |
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116 | READ(creftime(23:24),*)i_refday |
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117 | READ(creftime(26:27),*)i_refhour |
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118 | READ(creftime(29:30),*)i_refmin |
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119 | READ(creftime(32:33),*)i_refsec |
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120 | !Work out offset in days between reference time and 1/1/1950. |
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121 | CALL greg2jul( i_refsec, i_refmin, i_refhour, i_refday, & |
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122 | & i_refmonth, i_refyear, z_offset) |
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123 | |
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124 | ! Get list of times for each ob in seconds relative to reference time |
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125 | |
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126 | CALL chkerr( nf90_inq_varid( i_file_id, 'sst_dtime', i_var_id ), & |
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127 | & cpname, __LINE__ ) |
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128 | idims(1) = i_data |
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129 | idims(2) = i_time |
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130 | CALL chkdim( i_file_id, i_var_id, 2, idims, cpname, __LINE__ ) |
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131 | CALL chkerr( nf90_get_var ( i_file_id, i_var_id, i_dtime),& |
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132 | & cpname, __LINE__ ) |
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133 | zsca = 1.0 |
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134 | IF (nf90_inquire_attribute( i_file_id, i_var_id, "scale_factor") & |
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135 | & == nf90_noerr) THEN |
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136 | CALL chkerr( nf90_get_att( i_file_id, i_var_id, & |
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137 | & "scale_factor",zsca), cpname, __LINE__ ) |
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138 | ENDIF |
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139 | zoff = 0.0 |
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140 | IF (nf90_inquire_attribute( i_file_id, i_var_id, "add_offset") & |
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141 | & == nf90_noerr) THEN |
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142 | CALL chkerr( nf90_get_att( i_file_id, i_var_id, & |
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143 | & "add_offset",zoff), cpname, __LINE__ ) |
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144 | ENDIF |
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145 | i_dtime(:,:) = NINT((zsca * FLOAT(i_dtime(:,:))) & |
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146 | & + zoff) |
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147 | |
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148 | ! Get longitudes |
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149 | |
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150 | CALL chkerr( nf90_inq_varid( i_file_id, 'lon', i_var_id ), & |
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151 | & cpname, __LINE__ ) |
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152 | idims(1) = i_data |
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153 | CALL chkdim( i_file_id, i_var_id, 1, idims, cpname, __LINE__ ) |
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154 | CALL chkerr( nf90_get_var ( i_file_id, i_var_id, z_lam), & |
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155 | & cpname, __LINE__ ) |
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156 | |
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157 | ! Get latitudes |
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158 | |
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159 | CALL chkerr( nf90_inq_varid( i_file_id, 'lat', i_var_id ), & |
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160 | & cpname, __LINE__ ) |
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161 | idims(1) = i_data |
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162 | CALL chkdim( i_file_id, i_var_id, 1, idims, cpname, __LINE__ ) |
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163 | CALL chkerr( nf90_get_var ( i_file_id, i_var_id, z_phi), & |
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164 | & cpname, __LINE__ ) |
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165 | |
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166 | ! Get SST data |
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167 | |
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168 | CALL chkerr( nf90_inq_varid( i_file_id, 'sea_surface_temperature', & |
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169 | & i_var_id ), & |
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170 | & cpname, __LINE__ ) |
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171 | idims(1) = i_data |
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172 | idims(2) = i_time |
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173 | CALL chkdim( i_file_id, i_var_id, 2, idims, cpname, __LINE__ ) |
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174 | CALL chkerr( nf90_get_var ( i_file_id, i_var_id, z_sst), & |
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175 | & cpname, __LINE__ ) |
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176 | zoff = 0. |
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177 | IF (nf90_inquire_attribute( i_file_id, i_var_id, "scale_factor") & |
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178 | & == nf90_noerr) THEN |
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179 | CALL chkerr( nf90_get_att( i_file_id, i_var_id, & |
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180 | & "scale_factor",zsca), cpname, __LINE__ ) |
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181 | ENDIF |
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182 | zsca = 1.0 |
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183 | IF (nf90_inquire_attribute( i_file_id, i_var_id, "scale_factor") & |
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184 | & == nf90_noerr) THEN |
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185 | CALL chkerr( nf90_get_att( i_file_id, i_var_id, & |
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186 | & "scale_factor",zsca), cpname, __LINE__ ) |
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187 | ENDIF |
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188 | zfill = 0.0 |
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189 | IF (nf90_inquire_attribute( i_file_id, i_var_id, "_FillValue") & |
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190 | & == nf90_noerr) THEN |
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191 | CALL chkerr( nf90_get_att( i_file_id, i_var_id, & |
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192 | & "_FillValue",zfill), cpname, __LINE__ ) |
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193 | ENDIF |
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194 | WHERE(z_sst(:,:) /= zfill) |
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195 | z_sst(:,:) = (zsca * z_sst(:,:)) + zoff |
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196 | ELSEWHERE |
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197 | z_sst(:,:) = fbrmdi |
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198 | END WHERE |
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199 | |
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200 | ! Get QC flag |
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201 | |
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202 | CALL chkerr( nf90_inq_varid( i_file_id, 'confidence_flag', i_var_id ), & |
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203 | & cpname, __LINE__ ) |
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204 | idims(1) = i_data |
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205 | idims(2) = i_time |
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206 | CALL chkdim( i_file_id, i_var_id, 2, idims, cpname, __LINE__ ) |
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207 | CALL chkerr( nf90_get_var ( i_file_id, i_var_id, i_qc), & |
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208 | & cpname, __LINE__ ) |
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209 | |
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210 | ! Get SST obs type |
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211 | |
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212 | CALL chkerr( nf90_inq_varid( i_file_id, 'data_source', i_var_id ), & |
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213 | & cpname, __LINE__ ) |
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214 | idims(1) = i_data |
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215 | idims(2) = i_time |
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216 | CALL chkdim( i_file_id, i_var_id, 2, idims, cpname, __LINE__ ) |
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217 | CALL chkerr( nf90_get_var ( i_file_id, i_var_id, i_type), & |
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218 | & cpname, __LINE__ ) |
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219 | |
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220 | ! Close the file |
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221 | |
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222 | CALL chkerr( nf90_close( i_file_id ), cpname, __LINE__ ) |
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223 | |
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224 | ! Fill the obfbdata structure |
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225 | |
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226 | ! Allocate obfbdata |
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227 | |
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228 | iobs = i_data * i_time |
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229 | CALL init_obfbdata( inpfile ) |
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230 | CALL alloc_obfbdata( inpfile, 1, iobs, 1, 0, 0, ldgrid ) |
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231 | inpfile%cname(1) = 'SST' |
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232 | |
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233 | ! Fill the obfbdata structure from input data |
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234 | |
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235 | inpfile%cdjuldref = "19500101000000" |
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236 | iobs = 0 |
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237 | DO jtim = 1, i_time |
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238 | DO jobs = 1, i_data |
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239 | iobs = iobs + 1 |
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240 | ! Characters |
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241 | WRITE(inpfile%cdwmo(iobs),'(A6,A2)') 'ghrsst',' ' |
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242 | WRITE(inpfile%cdtyp(iobs),'(I4)') i_type(jobs,jtim) |
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243 | ! Real values |
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244 | inpfile%plam(iobs) = z_lam(jobs) |
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245 | inpfile%pphi(iobs) = z_phi(jobs) |
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246 | inpfile%pob(1,iobs,1) = z_sst(jobs,jtim) |
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247 | inpfile%ptim(iobs) = & |
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248 | & REAL(i_reftime(jtim))/(60.*60.*24.) + & |
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249 | & z_offset + REAL(i_dtime(jobs,jtim))/(60.*60.*24.) |
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250 | inpfile%pdep(1,iobs) = 0.0 |
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251 | ! Integers |
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252 | inpfile%kindex(iobs) = iobs |
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253 | IF ( z_sst(jobs,jtim) == fbrmdi ) THEN |
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254 | inpfile%ioqc(iobs) = 4 |
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255 | inpfile%ivqc(iobs,1) = 4 |
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256 | inpfile%ivlqc(1,iobs,1) = 4 |
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257 | ELSE |
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258 | inpfile%ioqc(iobs) = i_qc(jobs,jtim) |
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259 | inpfile%ivqc(iobs,1) = i_qc(jobs,jtim) |
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260 | inpfile%ivlqc(1,iobs,1) = 1 |
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261 | ENDIF |
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262 | inpfile%ipqc(iobs) = 0 |
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263 | inpfile%ipqcf(:,iobs) = 0 |
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264 | inpfile%itqc(iobs) = 0 |
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265 | inpfile%itqcf(:,iobs) = 0 |
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266 | inpfile%ivqcf(:,iobs,1) = 0 |
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267 | inpfile%ioqcf(:,iobs) = 0 |
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268 | inpfile%idqc(1,iobs) = 0 |
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269 | inpfile%idqcf(1,1,iobs) = 0 |
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270 | inpfile%ivlqcf(:,1,iobs,1) = 0 |
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271 | END DO |
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272 | END DO |
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273 | |
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274 | DEALLOCATE( & |
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275 | & i_reftime, & |
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276 | & i_dtime, & |
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277 | & i_qc, & |
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278 | & i_type, & |
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279 | & z_phi, & |
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280 | & z_lam, & |
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281 | & z_sst & |
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282 | & ) |
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283 | |
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284 | END SUBROUTINE read_ghrsst |
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285 | |
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286 | |
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