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| 1 | module esat_m |
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| 2 | |
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| 3 | implicit none |
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| 4 | |
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| 5 | contains |
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| 6 | |
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| 7 | elemental real function esat(T, P) |
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| 8 | |
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| 9 | ! Saturation vapor pressure of water in Pa. Buck, 1981, |
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| 10 | ! J. Appl. Meteor. 20, 1527-1532, equation (8). |
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| 11 | |
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| 12 | real, intent(in):: T ! temperature, in K |
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| 13 | real, intent(in):: P ! air pressure, in Pa |
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| 14 | |
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| 15 | !-------------------------------------------------------------------- |
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| 16 | |
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| 17 | esat = (1.0007 + 3.46e-8 * P) * 6.1121e2 & |
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| 18 | * exp(17.502 * (T - 273.15) / (T - 32.18)) |
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| 19 | |
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| 20 | end function esat |
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| 21 | |
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| 22 | end module esat_m |
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