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Last change
on this file since 3436 was
3175,
checked in by emillour, 11 months ago
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Pluto PCM:
Add the old Pluto LMDZ for reference (required prior step to making
an LMDZ.PLUTO using the same framework as the other physics packages).
TB+EM
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File size:
1.1 KB
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| 1 | subroutine methanesat(nsize,t,p,qsat,qsurf_n2) |
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| 2 | |
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| 3 | IMPLICIT NONE |
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| 4 | |
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| 5 | !======================================================================= |
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| 6 | ! |
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| 7 | ! Methane mass mixing ratio at saturation (kg/kg) for a given pressure (Pa) |
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| 8 | ! and Temperature (K) array |
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| 9 | ! |
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| 10 | !======================================================================= |
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| 11 | |
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| 12 | |
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| 13 | #include "dimensions.h" |
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| 14 | #include "dimphys.h" |
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| 15 | #include "callkeys.h" |
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| 16 | |
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| 17 | |
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| 18 | ! INPUT |
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| 19 | integer nsize |
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| 20 | real t(nsize) , p(nsize) |
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| 21 | ! OUTPUT |
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| 22 | real qsat(nsize),qsurf_n2(nsize) |
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| 23 | INTEGER i |
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| 24 | |
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| 25 | do i=1,nsize |
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| 26 | |
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| 27 | ! from Fray and schmitt fit by formulation L = 6.125e5 J/kg |
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| 28 | ! qsat(i)=0.117*exp((16*612.5/8.314)*(1/90.7-1/t(i)))*100000 |
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| 29 | qsat(i)=0.117*exp((1178.734664)*(0.01102536-1/t(i)))*100000 |
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| 30 | qsat(i)=qsat(i)* 16.0 / (28.0*p(i)) |
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| 31 | |
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| 32 | ! security : |
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| 33 | qsat(i)=min(qsat(i),0.99) |
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| 34 | |
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| 35 | enddo |
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| 36 | |
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| 37 | ! Raoult law if mixte in N2 ice : assume 0.5% CH4 in N2 |
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| 38 | if (nsize.le.ngridmx) then |
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| 39 | do i=1,nsize |
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| 40 | if (qsurf_n2(i).gt.0.001) qsat(i)=qsat(i)*0.005 !*(1.-dayfrac) ! .5 /100 |
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| 41 | end do |
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| 42 | endif |
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| 43 | |
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| 44 | return |
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| 45 | end subroutine methanesat |
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| 46 | |
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