The function estimates average monthly solar radiation (W m-2 d-1) using basic topographic and climatic information as input. Cloudiness is stochastically modeled, so output will vary between functional calls. Based on Nikolov and Zeller (1992) .

monthly_solar_radiation(lat, lon, doy, elev, T, Hr, P)

Arguments

lat

numeric latitude (degrees).

lon

numeric longitude (degrees).

doy

numeric day of year (1-366).

elev

numeric elevation (meters).

T

numeric mean monthly temperature (C).

Hr

numeric mean month relative humidity (percentage).

P

numeric total monthly precipitation (mm).

Value

numeric average monthly solar radiation (W m-2).

References

Nikolov NT, Zeller K (1992). “A solar radiation algorithm for ecosystem dynamic models.” Ecological Modelling, 61(3-4), 149-168. doi:10.24200/tjer.vol8iss2pp19-31 , https://www.researchgate.net/publication/253240330_Prediction_of_Hourly_Solar_Radiation_on_Horizontal_and_Inclined_Surfaces_for_MuscatOman.

Examples

  monthly_solar_radiation(lat  = 47.61, 
                          lon  = -122.33, 
                          doy  = 112, 
                          elev = 1500, 
                          T    = 15, 
                          Hr   = 50, 
                          P   = 50)
#> [1] 204.6984