Last change
on this file since 169 was
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checked in by pinsard, 13 years ago
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suppress successive semi-column lines
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Property svn:executable set to
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File size:
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1 | ;+ |
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2 | ; |
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3 | ; ============================= |
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4 | ; dew_temp_airt_rel_humidity_jv |
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5 | ; ============================= |
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6 | ; |
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7 | ; .. function:: dew_temp_airt_rel_humidity_jv(t, td) |
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8 | ; |
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9 | ; :param t: air temperature in degC |
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10 | ; :param td: dew point temperature in degC |
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11 | ; |
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12 | ; SEE ALSO |
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13 | ; ======== |
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14 | ; |
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15 | ; EXAMPLES |
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16 | ; ======== |
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17 | ; |
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18 | ; :: |
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19 | ; |
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20 | ; IDL> t=+todo+ |
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21 | ; IDL> td=+todo+ |
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22 | ; IDL> result=dew_temp_airt_rel_humidity_jv(t, td) |
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23 | ; |
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24 | ; TODO |
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25 | ; ==== |
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26 | ; |
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27 | ; hard coded directory - usage of ${PROJECT_ID} |
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28 | ; |
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29 | ; coding rules |
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30 | ; |
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31 | ; EVOLUTIONS |
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32 | ; ========== |
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33 | ; |
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34 | ; $Id$ |
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35 | ; |
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36 | ; $URL$ |
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37 | ; |
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38 | ; - fplod 20101214T093615Z aedon.locean-ipsl.upmc.fr (Darwin) |
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39 | ; |
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40 | ; * minimal header |
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41 | ; |
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42 | ; - pbk 2008 |
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43 | ; |
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44 | ; * creation |
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45 | ; |
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46 | ;- |
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47 | function dew_temp_airt_rel_humidity_jv, t,td |
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48 | ; |
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49 | if (not keyword_set(t)) then t=28 ; air temperature in degC |
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50 | if (not keyword_set(td)) then td=23 ; dew point temperature in degC |
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51 | es0=6.11 ; reference saturation vapor pressure (hPa) |
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52 | ; |
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53 | ; calculating fields. First saturation vapor pressure (Es) and |
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54 | ; actual vapor pressure are calculated. The ratio (E/Es)*100 |
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55 | ; gives the relative humidity |
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56 | ; |
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57 | e=es0*10^(7.5*td/(237.7+td)) |
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58 | es=es0*10^(7.5*t/(237.7+T)) |
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59 | ; |
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60 | rh=(e/es)*100 |
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61 | ;print, 'RH = ',rh |
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62 | ; |
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63 | return, rh |
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64 | ; |
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65 | end |
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