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()
)Value
- Td -
dew point temperature (degC)
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.
References
Monteith J.L., Unsworth M.H., 2008: Principles of Environmental Physics.
3rd edition. Academic Press, London.