EcoHydRology (version 0.4.12.1)

NetRad: Daily Net Radiation

Description

Daily net radiation [kJ m-2 d-1]

Usage

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"))

Arguments

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)

Examples

# NOT RUN {
NetRad(42.4*pi/180, Jday=55, Tx=2, Tn=(-3))
# }