Description Usage Arguments Details Value Author(s) References See Also Examples
Estimates downward facing longwave radiation (W/m2) using a relationship derived from Gabathuler et al 2001
1 | Lw(Ta = 20, RH = 0.5, n = 0.5)
|
Ta |
Local air temperature (degrees Celsius), ~ 2 m above ground |
RH |
Local relative humidity (fractional value from 0 to 1) |
n |
Fractional cloud cover (fractional value from 0 to 1) |
An alternative to Ld() for estimating incoming radiation by determining an offset temperature to account for the influence of atmospheric transmission loss. The incoming infrared radiation is estimated using the Stephan-Boltzmann relationship: emissivity*Stephan Boltzmann constant*T^4
A value, vector of length one, corresponding to the incoming longwave radiation, units: W/m2.
Glenn J Tattersall
Gabathuler et al 2001. Parameterization of incoming longwave radiation in high mountain environments. Physical Geography 22: 99-114
1 2 3 4 5 | # Example calculation:
Ta<-30
RH<-0.5
n<-0
Lw(Ta, RH, n)
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