1 | ;+ |
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2 | ; |
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3 | ; .. _d2m_to_q2m_erai.pro: |
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4 | ; |
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5 | ; =================== |
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6 | ; d2m_to_q2m_erai.pro |
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7 | ; =================== |
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8 | ; |
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9 | ; Converstion of d2m to q2m on OAFLUX grid |
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10 | ; |
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11 | ; :file:`${PROJECT_OD}/erai_d2m_19890101_20091231_oafluxgrid.nc` have been |
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12 | ; produced by :ref:`interp_erai_dewt_1989_2009.pro`. |
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13 | ; |
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14 | ; :file:`${PROJECT_OD}/erai_t2m_19890101_20091231_oafluxgrid.nc` have been |
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15 | ; produced by :ref:`interp_erai_t2m_1989_2009.pro`. |
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16 | ; |
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17 | ; :file:`${PROJECT_OD}/erai_msl_19890101_20091231_oafluxgrid.nc` have been |
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18 | ; produced by ++. |
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19 | ; |
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20 | ; q2m on OAFLUX grid is written in |
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21 | ; :file:`${PROJECT_OD}/q2m_erai_19890101_20091231_oafluxgrid.nc` |
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22 | ; if this file not already exists. |
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23 | ; |
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24 | ; This file will be used by :ref:`q2m_correction_ncdf.pro`. |
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25 | ; |
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26 | ; .. graphviz:: |
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27 | ; |
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28 | ; digraph d2m_to_q2m_erai { |
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29 | ; graph [ |
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30 | ; rankdir="LR", |
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31 | ; ] |
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32 | ; |
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33 | ; file_d2m [shape=ellipse,fontname=Courier,label="${PROJECT_OD}/erai_d2m_19890101_20091231_oafluxgrid.nc"]; |
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34 | ; file_t2m [shape=ellipse,fontname=Courier,label="${PROJECT_OD}/erai_t2m_19890101_20091231_oafluxgrid.nc"]; |
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35 | ; file_msl [shape=ellipse,fontname=Courier,label="${PROJECT_OD}/erai_msl_19890101_20091231_oafluxgrid.nc"]; |
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36 | ; file_q2m [shape=ellipse,fontname=Courier,label="${PROJECT_OD}/q2m_erai_19890101_20091231_oafluxgrid.nc"]; |
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37 | ; |
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38 | ; d2m_to_q2m_erai [shape=box, |
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39 | ; fontname=Courier, |
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40 | ; color=blue, |
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41 | ; URL="http://forge.ipsl.jussieu.fr/tropflux/browser/trunk/src/d2m_to_q2m_erai.pro", |
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42 | ; label="${PROJECT}/src/d2m_to_q2m_erai.pro"]; |
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43 | ; |
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44 | ; {file_d2m file_t2m file_msl} -> {d2m_to_q2m_erai} -> {file_q2m} |
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45 | ; } |
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46 | ; |
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47 | ; SEE ALSO |
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48 | ; ======== |
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49 | ; |
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50 | ; :ref:`project_profile.sh` |
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51 | ; |
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52 | ; :ref:`mooring_corrections` |
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53 | ; |
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54 | ; :ref:`interp_erai_dewt_1989_2009.pro` |
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55 | ; :ref:`interp_erai_t2m_1989_2009.pro` |
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56 | ; |
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57 | ; :ref:`d2m_to_q2m_erai.pro` |
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58 | ; |
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59 | ; :func:`rh_to_spechum` |
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60 | ; :func:`initncdf <saxo:initncdf>` |
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61 | ; :func:`read_ncdf <saxo:read_ncdf>` |
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62 | ; :func:`julday <saxo:julday>` |
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63 | ; :func:`ncdf_quickwrite <saxo:ncdf_quickwrite>` |
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64 | ; |
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65 | ; EXAMPLES |
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66 | ; ======== |
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67 | ; |
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68 | ; :: |
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69 | ; |
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70 | ; IDL> d2m_to_q2m_erai |
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71 | ; |
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72 | ; TODO |
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73 | ; ==== |
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74 | ; |
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75 | ; I (fp) do not know how |
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76 | ; ${PROJECT_OD}/erai_msl_19890101_20091231_oafluxgrid.nc is produced. |
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77 | ; |
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78 | ; es0 undefined |
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79 | ; |
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80 | ; coding rules |
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81 | ; |
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82 | ; EVOLUTIONS |
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83 | ; ========== |
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84 | ; |
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85 | ; - fplod 20110808T120234Z cratos (Linux) |
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86 | ; |
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87 | ; * usage of ${PROJECT_OD} |
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88 | ; * complete description |
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89 | ; * remove return statement |
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90 | ; |
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91 | ; - fplod 20101215T162933Z aedon.locean-ipsl.upmc.fr (Darwin) |
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92 | ; |
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93 | ; * graph correction |
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94 | ; |
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95 | ; - fplod 20101215T093141Z aedon.locean-ipsl.upmc.fr (Darwin) |
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96 | ; |
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97 | ; * add graph in header |
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98 | ; |
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99 | ; - fplod 20101214T093615Z aedon.locean-ipsl.upmc.fr (Darwin) |
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100 | ; |
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101 | ; * minimal header |
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102 | ; |
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103 | ; - pbk 2008 |
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104 | ; |
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105 | ; * creation |
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106 | ; |
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107 | ;- |
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108 | pro d2m_to_q2m_erai |
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109 | ; |
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110 | @cm_4cal |
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111 | @cm_4data |
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112 | @cm_4mesh |
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113 | @cm_4data |
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114 | @cm_project |
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115 | ; |
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116 | ; test if ${PROJECT_OD} defined |
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117 | CASE project_od_env OF |
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118 | '' : BEGIN |
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119 | msg = 'eee : ${PROJECT_OD} is not defined' |
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120 | ras = report(msg) |
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121 | STOP |
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122 | END |
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123 | ELSE: BEGIN |
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124 | msg = 'iii : ${PROJECT_OD} is ' + project_od_env |
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125 | ras = report(msg) |
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126 | END |
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127 | ENDCASE |
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128 | ; |
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129 | ; check if output data will be possible |
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130 | iodirout = isadirectory(project_od_env) |
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131 | ; |
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132 | ; existence and protection for reading |
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133 | IF (FILE_TEST(iodirout, /DIRECTORY, /EXECUTABLE, /READ) EQ 0) THEN BEGIN |
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134 | msg = 'eee : the directory' + iodirout + ' is not accessible.' |
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135 | ras = report(msg) |
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136 | STOP |
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137 | ENDIF |
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138 | ; |
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139 | ; existence and protection for writing |
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140 | IF (FILE_TEST(iodirout, /DIRECTORY, /WRITE) EQ 0) THEN BEGIN |
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141 | msg = 'eee : the directory' + iodirout + ' was not found.' |
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142 | ras = report(msg) |
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143 | STOP |
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144 | ENDIF |
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145 | ; |
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146 | d1=19881001 & d2=20101231 |
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147 | ; |
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148 | ; build d2m filename |
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149 | filename_d2m='erai_d2m_19890101_20091231_oafluxgrid.nc' |
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150 | ; |
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151 | ; check if this file exists |
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152 | fullfilename_d2m = isafile(iodirout + filename_d2m, NEW=0, /MUST_EXIST) |
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153 | IF fullfilename_d2m[0] EQ '' THEN BEGIN |
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154 | msg = 'eee : the file ' + fullfilename_d2m + ' was not found.' |
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155 | ras = report(msg) |
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156 | STOP |
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157 | ENDIF |
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158 | ; |
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159 | ; build t2m filename |
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160 | filename_t2m='erai_t2m_19890101_20091231_oafluxgrid.nc' |
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161 | ; |
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162 | ; check if this file exists |
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163 | fullfilename_t2m = isafile(iodirout + filename_t2m, NEW=0, /MUST_EXIST) |
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164 | IF fullfilename_t2m[0] EQ '' THEN BEGIN |
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165 | msg = 'eee : the file ' + fullfilename_t2m + ' was not found.' |
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166 | ras = report(msg) |
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167 | STOP |
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168 | ENDIF |
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169 | ; |
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170 | ; build msl filename |
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171 | filename_msl='erai_msl_19890101_20091231_oafluxgrid.nc' |
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172 | ; |
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173 | ; check if this file exists |
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174 | fullfilename_msl = isafile(iodirout + filename_msl, NEW=0, /MUST_EXIST) |
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175 | IF fullfilename_msl[0] EQ '' THEN BEGIN |
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176 | msg = 'eee : the file ' + fullfilename_msl + ' was not found.' |
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177 | ras = report(msg) |
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178 | STOP |
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179 | ENDIF |
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180 | ; |
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181 | ; build output filename |
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182 | filename_out = 'q2m_erai_19890101_20091231_oafluxgrid.nc' |
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183 | fullfilename_out = iodirout + filename_out |
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184 | ; in order to avoid unexpected overwritten |
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185 | IF (FILE_TEST(fullfilename_out) EQ 1) THEN BEGIN |
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186 | msg = 'eee : the file ' + fullfilename_out + ' already exists.' |
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187 | ras = report(msg) |
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188 | STOP |
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189 | ENDIF |
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190 | ; |
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191 | ; reading erai dew point temperature |
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192 | initncdf, fullfilename_d2m |
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193 | td=read_ncdf("d2m", d1,d2, file=fullfilename_d2m,/nostr) |
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194 | |
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195 | ; reading erai air temperature |
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196 | initncdf, fullfilename_t2m |
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197 | t=read_ncdf("t2m", d1,d2, file=fullfilename_t2m,/nostr) |
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198 | tt=time &jpt=n_elements(time) |
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199 | help, t, td |
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200 | |
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201 | ;;since the t2m and d2m are already in K, no need for conversion |
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202 | |
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203 | e=es0*exp((25.e5/461.5)*((1/273.15)-(1/td))) |
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204 | es=es0*exp((25.e5/461.5)*((1/273.15)-(1/t))) |
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205 | |
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206 | rh=(e/es)*100 |
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207 | |
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208 | ;; conversion of relative humidity to sp. humidity |
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209 | ;; Ref.1 - Gill, Appendix 4, |
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210 | ;; Ref.2 - http://efdl.cims.nyu.edu/project_aomip/forcing_data/atmosphere/humidity.html |
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211 | |
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212 | t=t-273.15 |
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213 | |
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214 | initncdf, fullfilename_msl |
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215 | P=read_ncdf("msl", d1, d2, file=fullfilename_msl,/nostr) |
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216 | help, P |
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217 | q2m=rh_to_spechum(rh,t,P) |
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218 | |
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219 | ;writing field |
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220 | ncfile='!' + fullfilename_out |
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221 | time=timegen(7670, units='days', start=julday(1,1,1989)) & jpt=n_elements(time) |
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222 | cda0=string(jul2date(time(0)),format='(i8.8)') |
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223 | cda1=string(jul2date(time(jpt-1)),format='(i8.8)') |
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224 | |
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225 | |
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226 | tt=time-julday(1,1,1950,00,00,00) |
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227 | xlon=reform(glamt(*,0) ) & ylat=reform(gphit(0,*)) |
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228 | valmask=1.e20 |
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229 | |
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230 | lon_attr={units:'degrees_east',long_name:'Longitude'} |
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231 | lat_attr={units:'degrees_north',long_name:'Latitude'} |
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232 | q2m_attr={units:'kg/kg',missing_value:valmask,long_name:'Surface specific humidity at 2m ',short_name:'q2m',axis:'TYX'} |
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233 | time_attr={units:'days since 1950-01-01 00:00:00',long_name:'Time axis',time_origin:' 1950-JAN-01 00:00:00'} |
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234 | globattr={source:'Surface specific humidity at 2m calculated from dew point temperature',timerange:cda0+' - '+cda1} |
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235 | |
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236 | ncfields = 'q2m[longitude,latitude,time]=q2m:q2m_attr; ' $ |
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237 | + 'longitude[]=xlon:lon_attr; ' $ |
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238 | + 'latitude[]=ylat:lat_attr; ' $ |
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239 | + 'tt[*time]=tt:time_attr ' $ |
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240 | + ' @ globattr' |
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241 | |
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242 | @ncdf_quickwrite |
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243 | end |
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