virtual.temp: Virtual Temperature

In bigleaf: Physical and Physiological Ecosystem Properties from Eddy Covariance Data

Virtual Temperature

Description

Virtual temperature, defined as the temperature at which dry air would have the same density as moist air at its actual temperature.

Usage

virtual.temp(
  Tair,
  pressure,
  VPD,
  Esat.formula = c("Sonntag_1990", "Alduchov_1996", "Allen_1998"),
  constants = bigleaf.constants()
)

Arguments

Tair	Air temperature (deg C)
pressure	Atmospheric pressure (kPa)
VPD	Vapor pressure deficit (kPa)
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	Kelvin - conversion degree Celsius to Kelvin eps - ratio of the molecular weight of water vapor to dry air (-)

Details

the virtual temperature is given by:

Tv = Tair / (1 - (1 - eps) e/pressure)

where Tair is in Kelvin (converted internally). Likewise, VPD is converted to actual vapor pressure (e in kPa) with VPD.to.e internally.

Value

Tv -	virtual temperature (deg C)

References

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

Examples

virtual.temp(25,100,1.5)                        
              

bigleaf documentation built on Aug. 22, 2022, 9:09 a.m.