Ld: Estimates downward facing longwave radiation (W/m2)
In gtatters/Thermimage: Thermal Image Analysis
Description
Usage
Arguments
Details
Value
Author(s)
References
See Also
Examples
Description
Estimates downward incoming longwave radiation (W/m2) using relationship derived from Konzelmann et al. 1994.
Usage
1
Ld(Ta = 20, RH = 0.5, n = 0.5)
Arguments
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)
Details
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.
Value
A value, vector of length one, corresponding to the incoming longwave radiation, units: W/m2.
Author(s)
Glenn J Tattersall
References
Konzelmann et al 1994. Parameterization of global and longwave incoming radiation for the Greenland ice-sheet. Global and Planetary Change. 9: 143-164.
See Also
Examples
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)
gtatters/Thermimage documentation built on Sept. 28, 2021, 2:02 p.m.
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Description Usage Arguments Details Value Author(s) References See Also Examples
Description
Estimates downward incoming longwave radiation (W/m2) using relationship derived from Konzelmann et al. 1994.
Usage
1 | Ld(Ta = 20, RH = 0.5, n = 0.5)
|
Arguments
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) |
Details
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.
Value
A value, vector of length one, corresponding to the incoming longwave radiation, units: W/m2.
Author(s)
Glenn J Tattersall
References
Konzelmann et al 1994. Parameterization of global and longwave incoming radiation for the Greenland ice-sheet. Global and Planetary Change. 9: 143-164.
See Also
Examples
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)
|
R Package Documentation
Browse R Packages
We want your feedback!
Note that we can't provide technical support on individual packages. You should contact the package authors for that.
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