plantecophys (version 0.6-3)

RHtoVPD: Conversions between relative humidity, vapour pressure deficit and dewpoint

Description

Converts relative humidity (%) to vapour pressure deficit (kPa), or vice versa. To convert from relative humidity, use the RHtoVPD function, use VPDtoRH for the other way around. The water vapor saturation pressure is calculated with esat (using Jones 1992). Also provided is DewtoVPD to convert from dewpoint temperature to VPD. The functions VPDleafToAir and VPDairToLeaf convert VPD from a leaf temperature to an air-temperature basis and vice versa.

Usage

RHtoVPD(RH, TdegC, Pa = 101)

VPDtoRH(VPD, TdegC, Pa = 101)

esat(TdegC, Pa = 101)

DewtoVPD(Tdew, TdegC, Pa = 101)

VPDleafToAir(VPD, Tleaf, Tair, Pa = 101)

VPDairToLeaf(VPD, Tair, Tleaf, Pa = 101)

RHleafToAir(RH, Tleaf, Tair, Pa = 101)

RHairToLeaf(RH, Tair, Tleaf, Pa = 101)

Arguments

RH

Relative humidity (%)

TdegC

Temperature (degrees C) (either leaf or air)

Pa

Atmospheric pressure (kPa)

VPD

Vapour pressure deficit (kPa)

Tdew

Dewpoint temperature (degrees C)

Tleaf

Leaf temperature (degrees C)

Tair

Air temperature (degrees C)

References

Jones, H.G. 1992. Plants and microclimate: a quantitative approach to environmental plant physiology. 2nd Edition., 2nd Edn. Cambridge University Press, Cambridge. 428 p.