Description Usage Arguments Value References
View source: R/radiation_functions.R
Calculates the net outgoing longwave radiation for a given location based on incoming solar radiation, incoming clear-sky radiation, and air temperature records. Based on Equation 39 and p.74-75 in Allen et al. (1998).
1 |
dt |
string indicating the timestep of input weather series. Expects "hourly", "daily", or "monthly". |
Rs |
incoming solar radiation (MJ/m^2/timestep), vector or atomic number |
Rso |
clear-sky solar radiation (MJ/m^2/timestep), vector or atomic number. |
ea |
actual vapour pressure (kPa), vector or atomic number. |
atmp |
air temperature (degrees C). When dt is "daily" or larger, argument should be a list with elements "min" and "max" for daily min and max temperatures. When dt is "hourly", argument should be a vector or atomic number with hourly recorded temperatures. |
SBc |
Stefan-Boltzman constant (MJ/m^2/day). Defaults to 4.903e-9 MJ/m^2/day. |
Rnl |
Net outgoing longwave radiation (MJ/m^2/hour or MJ/m^2/day, depending on dt) |
Allen, R. G., Pereira, L. S., Raes, D., & Smith, M. (1998). Crop evapotranspiration: Guidelines for computing crop water requirements. Rome: FAO. Retrieved from http://www.fao.org/docrep/X0490E/x0490e00.htm.
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