Emissivity of the Atmosphere — rad_emissivity

Calculates the emissivity of the atmosphere.

Usage

rad_emissivity_air(...)

# Default S3 method
rad_emissivity_air(temp, rh, ...)

# S3 method for class 'weather_station'
rad_emissivity_air(weather_station, ...)

Arguments

...: Named station fields, site parameters or model assumptions.
temp: Air temperature in degrees C.
rh: Relative humidity in percent.
weather_station: A weather_station object.

Value

Emissivity ratio from 0 to 1.

Details

The emissivity of the atmosphere ($\epsilon_{air}$) is calculated as: $$\epsilon_{air} = (1.24 \cdot \frac{e}{T_{air}})^{1/7}$$ where: $e$ is the vapor pressure, $T_{air}$ is the air temperature in Kelvin.

References

Bendix 2004, p. 66 eq. 3.22.

Examples

# Calculate emissivity of the atmosphere
rad_emissivity_air(temp = 15, rh = 60)
#> [1] 0.6409648