bigleaf (version 0.7.0)

dew.point: 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)

Value

Td -

dew point temperature (degC)

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.

References

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

Examples

# NOT RUN {
dew.point(c(25,30),1.5)                

# }