Description Usage Arguments Details Value Author(s) References See Also Examples
Estimates downward incoming longwave radiation (W/m2) using relationship derived from Konzelmann et al. 1994.
1 | Ld(Ta = 20, RH = 0.5, n = 0.5)
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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) |
By estimating the sky emissivity, from information on humidity and cloud cover, the incoming infrared radiation can be estimated using the Stephan-Boltzmann relationship: emissivity*Stephan Boltzmann constant * T^4. The effective atmospheric emissivity is determined from known cloud emissivity (0.97) and empirically determined clear sky emissivities.
A value, vector of length one, corresponding to the incoming longwave radiation, units: W/m2.
Glenn J Tattersall
Konzelmann et al 1994. Parameterization of global and longwave incoming radiation for the Greenland ice-sheet. Global and Planetary Change. 9: 143-164.
1 2 3 4 5 6 7 | # Returns a value in W/m2 of the estimated incoming longwave radiation
# Example calculation:
Ta<-30
RH<-0.5
n<-0
Ld(Ta, RH, n)
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