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 | ; .. graphviz:: |
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10 | ; |
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11 | ; digraph d2m_to_q2m_erai { |
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12 | ; graph [ |
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13 | ; rankdir="LR", |
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14 | ; ] |
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15 | ; file_d2m [shape=ellipse,fontname=Courier,label="/Volumes/PRAVEEN/TropFlux/input_uncor/erai_d2m_19890101_20091231_oafluxgrid.nc"]; |
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16 | ; file_t2m [shape=ellipse,fontname=Courier,label="/Volumes/PRAVEEN/TropFlux/input_uncor/erai_t2m_19890101_20091231_oafluxgrid.nc"]; |
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17 | ; file_msl [shape=ellipse,fontname=Courier,label="/Volumes/PRAVEEN/TropFlux/input_uncor/erai_msl_19890101_20091231_oafluxgrid.nc"]; |
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18 | |
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19 | ; file_q2m [shape=ellipse,fontname=Courier,label="/Volumes/PRAVEEN/TropFlux/input_uncor/q2m_erai_19890101_20091231_oafluxgrid.nc"]; |
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20 | ; |
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21 | ; d2m_to_q2m_erai [shape=box, |
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22 | ; fontname=Courier, |
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23 | ; color=blue, |
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24 | ; URL="http://forge.ipsl.jussieu.fr/tropflux/browser/trunk/src/d2m_to_q2m_erai.pro", |
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25 | ; label="${PROJECT}/src/d2m_to_q2m_erai.pro"]; |
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26 | ; {file_d2m file_t2m file_msl} -> {d2m_to_q2m_erai} -> {file_q2m} |
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27 | ; } |
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28 | ; |
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29 | ; SEE ALSO |
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30 | ; ======== |
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31 | ; |
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32 | ; :func:`rh_to_spechum` |
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33 | ; :func:`initncdf <saxo:initncdf>` |
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34 | ; :func:`read_ncdf <saxo:read_ncdf>` |
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35 | ; :func:`julday <saxo:julday>` |
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36 | ; :func:`ncdf_quickwrite <saxo:ncdf_quickwrite>` |
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37 | ; |
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38 | ; EXAMPLES |
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39 | ; ======== |
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40 | ; |
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41 | ; :: |
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42 | ; |
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43 | ; IDL> d2m_to_q2m_erai |
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44 | ; |
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45 | ; TODO |
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46 | ; ==== |
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47 | ; |
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48 | ; hard coded directory - usage of ${PROJECT_ID} |
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49 | ; |
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50 | ; coding rules |
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51 | ; |
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52 | ; EVOLUTIONS |
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53 | ; ========== |
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54 | ; |
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55 | ; - fplod 20101215T162933Z aedon.locean-ipsl.upmc.fr (Darwin) |
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56 | ; |
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57 | ; * graph correction |
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58 | ; |
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59 | ; - fplod 20101215T093141Z aedon.locean-ipsl.upmc.fr (Darwin) |
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60 | ; |
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61 | ; * add graph in header |
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62 | ; |
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63 | ; - fplod 20101214T093615Z aedon.locean-ipsl.upmc.fr (Darwin) |
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64 | ; |
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65 | ; * minimal header |
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66 | ; |
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67 | ; - pbk 2008 |
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68 | ; |
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69 | ; * creation |
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70 | ; |
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71 | ;- |
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72 | pro d2m_to_q2m_erai |
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73 | @common |
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74 | ;; reading erai dew point temperature |
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75 | d1=19881001 & d2=20101231 |
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76 | |
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77 | file='/Volumes/PRAVEEN/TropFlux/input_uncor/erai_d2m_19890101_20091231_oafluxgrid.nc' |
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78 | initncdf, file |
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79 | td=read_ncdf("d2m", d1,d2, file=file,/nostr) |
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80 | |
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81 | ;; reading erai air temperature |
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82 | file='/Volumes/PRAVEEN/TropFlux/input_uncor/erai_t2m_19890101_20091231_oafluxgrid.nc' |
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83 | initncdf, file |
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84 | t=read_ncdf("t2m", d1,d2, file=file,/nostr) |
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85 | tt=time &jpt=n_elements(time) |
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86 | help, t, td |
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87 | |
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88 | ;;since the t2m and d2m are already in K, no need for conversion |
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89 | |
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90 | e=es0*exp((25.e5/461.5)*((1/273.15)-(1/td))) |
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91 | es=es0*exp((25.e5/461.5)*((1/273.15)-(1/t))) |
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92 | |
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93 | rh=(e/es)*100 |
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94 | |
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95 | ;; conversion of relative humidity to sp. humidity |
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96 | ;; Ref.1 - Gill, Appendix 4, |
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97 | ;; Ref.2 - http://efdl.cims.nyu.edu/project_aomip/forcing_data/atmosphere/humidity.html |
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98 | |
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99 | t=t-273.15 |
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100 | |
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101 | file='/Volumes/PRAVEEN/TropFlux/input_uncor/erai_msl_19890101_20091231_oafluxgrid.nc' |
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102 | initncdf, file |
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103 | P=read_ncdf("msl", d1, d2, file=file,/nostr) |
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104 | help, P |
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105 | q2m=rh_to_spechum(rh,t,P) |
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106 | |
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107 | ;;writing field |
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108 | ncfile='!/Volumes/PRAVEEN/TropFlux/input_uncor/q2m_erai_19890101_20091231_oafluxgrid.nc' |
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109 | time=timegen(7670, units='days', start=julday(1,1,1989)) & jpt=n_elements(time) |
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110 | cda0=string(jul2date(time(0)),format='(i8.8)') |
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111 | cda1=string(jul2date(time(jpt-1)),format='(i8.8)') |
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112 | |
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113 | |
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114 | tt=time-julday(1,1,1950,00,00,00) |
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115 | xlon=reform(glamt(*,0) ) & ylat=reform(gphit(0,*)) |
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116 | valmask=1.e20 |
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117 | |
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118 | lon_attr={units:'degrees_east',long_name:'Longitude'} |
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119 | lat_attr={units:'degrees_north',long_name:'Latitude'} |
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120 | q2m_attr={units:'kg/kg',missing_value:valmask,long_name:'Surface specific humidity at 2m ',short_name:'q2m',axis:'TYX'} |
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121 | 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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122 | globattr={source:'Surface specific humidity at 2m calculated from dew point temperature',timerange:cda0+' - '+cda1} |
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123 | |
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124 | ncfields = 'q2m[longitude,latitude,time]=q2m:q2m_attr; ' $ |
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125 | + 'longitude[]=xlon:lon_attr; ' $ |
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126 | + 'latitude[]=ylat:lat_attr; ' $ |
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127 | + 'tt[*time]=tt:time_attr ' $ |
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128 | + ' @ globattr' |
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129 | |
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130 | @ncdf_quickwrite |
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131 | return |
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132 | end |
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