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Last change
on this file since 2429 was
2,
checked in by lmdz, 25 years ago
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Initial revision
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Property svn:eol-style set to
native
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Property svn:keywords set to
Author Date Id Revision
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File size:
1.5 KB
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| [2] | 1 | FUNCTION q_sat(kelvin, millibar) |
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| 2 | c |
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| 3 | IMPLICIT none |
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| 4 | c====================================================================== |
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| 5 | c Autheur(s): Z.X. Li (LMD/CNRS) |
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| 6 | c Objet: calculer la vapeur d'eau saturante (formule Centre Euro.) |
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| 7 | c====================================================================== |
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| 8 | c Arguments: |
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| 9 | c kelvin---input-R: temperature en Kelvin |
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| 10 | c millibar--input-R: pression en mb |
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| 11 | c |
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| 12 | c q_sat----output-R: vapeur d'eau saturante en kg/kg |
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| 13 | c====================================================================== |
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| 14 | c |
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| 15 | REAL q_sat, kelvin, millibar |
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| 16 | c |
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| 17 | REAL r2es |
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| 18 | PARAMETER (r2es=611.14 *18.0153/28.9644) |
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| 19 | c |
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| 20 | REAL r3les, r3ies, r3es |
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| 21 | PARAMETER (R3LES=17.269) |
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| 22 | PARAMETER (R3IES=21.875) |
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| 23 | c |
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| 24 | REAL r4les, r4ies, r4es |
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| 25 | PARAMETER (R4LES=35.86) |
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| 26 | PARAMETER (R4IES=7.66) |
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| 27 | c |
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| 28 | REAL rtt |
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| 29 | PARAMETER (rtt=273.16) |
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| 30 | c |
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| 31 | REAL retv |
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| 32 | PARAMETER (retv=28.9644/18.0153 - 1.0) |
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| 33 | c |
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| 34 | REAL zqsat |
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| 35 | REAL temp, pres |
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| 36 | C ------------------------------------------------------------------ |
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| 37 | c |
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| 38 | c |
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| 39 | temp = kelvin |
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| 40 | pres = millibar * 100.0 |
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| 41 | c write(*,*)'kelvin,millibar=',kelvin,millibar |
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| 42 | c write(*,*)'temp,pres=',temp,pres |
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| 43 | c |
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| 44 | IF (temp .LE. rtt) THEN |
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| 45 | r3es = r3ies |
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| 46 | r4es = r4ies |
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| 47 | ELSE |
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| 48 | r3es = r3les |
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| 49 | r4es = r4les |
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| 50 | ENDIF |
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| 51 | c |
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| 52 | zqsat=r2es/pres * EXP ( r3es*(temp-rtt) / (temp-r4es) ) |
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| 53 | zqsat=MIN(0.5,ZQSAT) |
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| 54 | zqsat=zqsat/(1.-retv *zqsat) |
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| 55 | c |
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| 56 | q_sat = zqsat |
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| 57 | c |
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| 58 | RETURN |
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| 59 | END |
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