Longwave Outgoing Radiation — rad_lw

Calculates the longwave radiation of the surface.

Usage

rad_lw_out(...)

# Default S3 method
rad_lw_out(surface_type, surface_temp, ..., sigma = sigma_default)

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

Arguments

...: Named station fields, site parameters or model assumptions.
surface_type: Surface-type label.
surface_temp: Surface temperature in degrees C.
sigma: Stefan-Boltzmann constant in W m-2 K-4.
weather_station: A weather_station object.

Value

Longwave outgoing radiation in W/m².

Details

The longwave outgoing radiation ($LW_{out}$) is calculated as: $$LW_{out} = \epsilon \cdot \sigma \cdot T_{surface}^4$$ where: $\epsilon$ is the emissivity of the surface, $\sigma$ is the Stefan-Boltzmann constant, and $T_{surface}$ is the surface temperature in Kelvin. Emissivity is selected from the package surface_properties table. Bendix/Oke-style surface-property background is used for the method context.

References

Bendix 2004, p. 66 eq. 3.20.

Examples

# Calculate longwave outgoing radiation
rad_lw_out(surface_type = "lawn", surface_temp = 15)
#> [1] 371.3743