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Last change
on this file since 1242 was
689,
checked in by flefevre, 13 years ago
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Minor change. Better handling of very small water mixing ratio at saturation
(for very low temperatures).
|
|
File size:
1.2 KB
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| Rev | Line | |
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| [38] | 1 | SUBROUTINE watersat(naersize,t,p,qsat) |
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| 2 | IMPLICIT NONE |
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| 3 | |
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| 4 | c======================================================================= |
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| 5 | c |
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| 6 | c Water mass mixing ratio at saturation (kg/kg) for a given pressure (Pa) |
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| 7 | c and Temperature (K) array |
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| 8 | c |
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| 9 | c======================================================================= |
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| 10 | |
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| 11 | c declarations: |
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| 12 | c ------------- |
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| 13 | c arguments: |
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| 14 | c ---------- |
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| 15 | |
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| 16 | c INPUT |
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| 17 | integer naersize |
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| 18 | real t(naersize) , p(naersize) |
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| 19 | c OUTPUT |
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| 20 | real qsat(naersize) |
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| 21 | |
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| 22 | c local: |
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| 23 | c ------ |
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| 24 | INTEGER i |
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| 25 | REAL r2,r3,r4 , To, es |
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| 26 | SAVE r2,r3,r4 |
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| 27 | DATA r2,r3,r4/611.14,21.875,7.66/ |
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| 28 | SAVE To |
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| 29 | DATA To/273.16/ |
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| 30 | |
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| 31 | do i=1,naersize |
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| 32 | c pression de vapeur saturante : |
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| 33 | c es =r2*exp(r3*(t(i)-To)/(t(i)-r4)) |
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| 34 | c qsat(i)=es/p(i)*0.41 !rapport de melange |
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| 35 | es=2.07023-0.00320991*t(i)-2484.896/t(i)+3.56654*alog10(t(i)) |
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| 36 | es=10.**es |
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| 37 | qsat(i)=(es*100.)/p(i)*0.41 |
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| [689] | 38 | qsat(i) = max(qsat(i), 1.e-30) |
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| [38] | 39 | |
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| 40 | c qss = specific humidity |
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| 41 | c qss=622*10**(2.07023-0.0032991*Tsurf(ig)-2484.896/Tsurf(ig) |
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| 42 | c $ +3.56654*log10(Tsurf(ig))) |
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| 43 | |
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| 44 | enddo |
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| 45 | |
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| 46 | RETURN |
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| 47 | END |
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| 48 | |
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