dew.point {bigleaf}

Dew Point

Description

calculates the dew point, the temperature to which air must be cooled to become saturated (i.e. e = Esat(Td))

Usage

dew.point(
  Tair,
  VPD,
  accuracy = 0.001,
  Esat.formula = c("Sonntag_1990", "Alduchov_1996", "Allen_1998"),
  constants = bigleaf.constants()
)

Arguments

Tair

Air temperature (degC)

VPD

Vapor pressure deficit (kPa)

accuracy

Accuracy of the result (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

Pa2kPa - conversion pascal (Pa) to kilopascal (kPa)

Details

Dew point temperature (Td) is defined by:

e = Esat(Td)

where e is vapor pressure of the air and Esat is the vapor pressure deficit. This equation is solved for Td using optimize.

Value

Td -

dew point temperature (degC)

References

Monteith J.L., Unsworth M.H., 2008: Principles of Environmental Physics. 3rd edition. Academic Press, London.

Examples

dew.point(c(25,30),1.5)