VPD.to.rH: Conversions between Humidity Measures

Description

Conversion between vapor pressure (e), vapor pressure deficit (VPD), specific humidity (q), and relative humidity (rH).

Usage

VPD.to.rH(VPD, Tair, Esat.formula = c("Sonntag_1990", "Alduchov_1996",
  "Allen_1998"), constants = bigleaf.constants())
rH.to.VPD(rH, Tair, Esat.formula = c("Sonntag_1990", "Alduchov_1996",
  "Allen_1998"), constants = bigleaf.constants())
e.to.rH(e, Tair, Esat.formula = c("Sonntag_1990", "Alduchov_1996",
  "Allen_1998"), constants = bigleaf.constants())
VPD.to.e(VPD, Tair, Esat.formula = c("Sonntag_1990", "Alduchov_1996",
  "Allen_1998"), constants = bigleaf.constants())
e.to.VPD(e, Tair, Esat.formula = c("Sonntag_1990", "Alduchov_1996",
  "Allen_1998"), constants = bigleaf.constants())
e.to.q(e, pressure, constants = bigleaf.constants())
q.to.e(q, pressure, constants = bigleaf.constants())
q.to.VPD(q, Tair, pressure, Esat.formula = c("Sonntag_1990",
  "Alduchov_1996", "Allen_1998"), constants = bigleaf.constants())
VPD.to.q(VPD, Tair, pressure, Esat.formula = c("Sonntag_1990",
  "Alduchov_1996", "Allen_1998"), constants = bigleaf.constants())

Arguments

VPD

Vapor pressure deficit (kPa)

Tair

Air temperature (deg C)

Esat.formula

Optional: formula to be used for the calculation of esat and the slope of esat. One of "Sonntag_1990" (Default), "Alduchov_1996", or "Allen_1998". See Esat.slope.

constants

eps - ratio of the molecular weight of water vapor to dry air (-) Pa2kPa - conversion pascal (Pa) to kilopascal (kPa)

Relative humidity (-)

Vapor pressure (kPa)

pressure

Atmospheric pressure (kPa)

Specific humidity (kg kg-1)

References

Foken, T, 2008: Micrometeorology. Springer, Berlin, Germany.