NetRad {EcoHydRology} | R Documentation |
Daily net radiation [kJ m-2 d-1]
NetRad(lat, Jday, Tx, Tn, albedo = 0.18, forest = 0, slope = 0, aspect = 0, airtemp = (Tn+Tx)/2, cloudiness = "Estimate", surfemissivity = 0.97, surftemp = (Tn+Tx)/2, units = "kJm2d", AEparams=list(vp=NULL, opt="linear"))
lat |
latitude. Default is radians, but will automatically convert from degrees if value is larger than pi/2 or less than -pi/2 |
Jday |
Day of the year [-] |
Tx |
Max temperature [C] |
Tn |
Min temperature [C] |
albedo |
Albedo (0-1) [-] |
forest |
Forest canopy or shade cover (0-1) [-] |
slope |
Slope [radians] |
aspect |
Ground aspect [radians from north] |
airtemp |
Average air temp [C] |
cloudiness |
Cloudiness percentage (0-1) [-] Default value will estimate cloudiness based on daily temperature difference. |
surfemissivity |
Surface emissivity [-] |
surftemp |
Surface temperature [C] |
units |
Units of the result. Defaults to "kJm2d" which returns result in kJ/m2/d, the other option is "Wm2", which will make output in W/m2 |
AEparams |
Atmospheric Emissivity options. Defaults to linear approximation. To use Brutsaert option, include vapor pressure values (kPa) |
M. Todd Walter, Josephine Archibald
NetRad(42.4*pi/180, Jday=55, Tx=2, Tn=(-3))