wetbulb.temp: Wet-Bulb Temperature

In lhmet-forks/bigleaf: Physical and Physiological Ecosystem Properties from Eddy Covariance Data

Description

calculates the wet bulb temperature, i.e. the temperature that the air would have if it was saturated.

Usage

wetbulb.temp(Tair, pressure, VPD, accuracy = 0.001,
  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)
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	cp - specific heat of air for constant pressure (J K-1 kg-1) eps - ratio of the molecular weight of water vapor to dry air (-) Pa2kPa - conversion pascal (Pa) to kilopascal (kPa)

Details

Wet-bulb temperature (Tw) is calculated from the following expression:

e = Esat(Tw) - gamma* (Tair - Tw)

The equation is solved for Tw using optimize. Actual vapor pressure e (kPa) is calculated from VPD using the function VPD.to.e. The psychrometric constant gamma (kPa K-1) is calculated from psychrometric.constant.

Value

Tw -	wet-bulb temperature (degC)

References

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

Examples

wetbulb.temp(Tair=c(20,25),pressure=100,VPD=c(1,1.6))             
       

lhmet-forks/bigleaf documentation built on Aug. 4, 2020, 12:08 a.m.