EcoHydRology (version 0.4.12.1)

AtmosphericEmissivity: Atmospheric Emissivity

Description

The emissivity of the atmsophere [-]

Usage

AtmosphericEmissivity(airtemp, cloudiness, vp=NULL, opt="linear")

Arguments

airtemp

Air temperature: air temperature [C]

cloudiness

Cloudiness: fraction of the sky covered in clouds [-]

vp

Vapor Pressure : [kPa]

opt

option: either "linear" for a linear relationship between clear sky emissivity and temperature, or "Brutsaert" to use Brutsaert's(1975) clear sky emissivity formulation - this requires input for vapor pressure

Value

The emissivity of the atmsophere [-]

References

Campbell, G. S., Norman, J.M., 1998. An Introduction to Environmental Biophysics, second ed., Springer, New York, p. 286.

Brutsaert, W. (1975 On a Derivable Formula for Long-Wave Radiation From Clear Skies. Water Resources Research, 11(5) 742-744

Examples

# NOT RUN {
temp=15
clouds=.5
AtmEm=AtmosphericEmissivity(temp,clouds)
print(AtmEm)
# }