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Last change
on this file since 537 was
253,
checked in by emillour, 13 years ago
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Generic GCM
- Massive update to version 0.7
EM+RW
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File size:
1.1 KB
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| 1 | subroutine watersat(T,p,qsat) |
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| 2 | |
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| 3 | use watercommon_h, only: To, epsi |
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| 4 | implicit none |
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| 5 | |
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| 6 | !================================================================== |
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| 7 | ! Purpose |
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| 8 | ! ------- |
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| 9 | ! Compute the water mass mixing ratio at saturation (kg/kg) |
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| 10 | ! for a given pressure (Pa) and temperature (K) |
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| 11 | ! A replacement for the old watersat.F in the Martian GCM. |
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| 12 | ! Based on FCTTRE.h in the LMDTERRE model. |
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| 13 | ! |
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| 14 | ! Authors |
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| 15 | ! ------- |
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| 16 | ! Robin Wordsworth (2010) |
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| 17 | ! |
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| 18 | !================================================================== |
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| 19 | |
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| 20 | ! input |
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| 21 | real T, p |
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| 22 | |
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| 23 | ! output |
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| 24 | real qsat |
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| 25 | |
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| 26 | ! checked vs. NIST data 22/06/2010 by RW. |
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| 27 | ! / by p gives partial pressure |
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| 28 | ! x by epsi converts to mass mixing ratio |
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| 29 | |
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| 30 | if (T.lt.To) then ! solid / vapour |
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| 31 | qsat = 100.0 * epsi * 10**(2.07023 - 0.00320991 & |
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| 32 | * T - 2484.896 / T + 3.56654 * alog10(T)) |
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| 33 | else ! liquid / vapour |
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| 34 | qsat = 100.0 * epsi * 10**(23.8319 - 2948.964 / T - 5.028 & |
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| 35 | * alog10(T) - 29810.16 * exp( -0.0699382 * T) & |
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| 36 | + 25.21935 * exp(-2999.924/T)) |
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| 37 | endif |
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| 38 | qsat=qsat/p |
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| 39 | |
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| 40 | return |
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| 41 | end subroutine watersat |
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