EcoHydRology (version 0.4.12.1)

EnvirEnergy: The Surface Net Energy Budget

Description

Net Energy=S+La-Lt+S+E+R+G, where S is the net incident solar radiation, La is the atmospheric long wave radiation, Lt is the terrestrial long wave radiation, H is the sensible heat exchange, E is the energy flux associated with the latent heats of vaporization and condensation, G is ground heat conduction, P is heat added by precipitation

Usage

EnvirEnergy(lat, Jday, Tx, Tn, wind, rain, relativehumidity,
 albedo=0.2, cloudiness=NULL, forest=0, slope=0, aspect=0, 
 surftemp=(Tx+Tn)/2, surfemissivity=0.97)

Arguments

lat

latitdue [rad]

Jday

Julian day / day of the year, 1-365 [day]

Tx

Maximum daily temperature [C]

Tn

Minimum daily temperature [C]

wind

Average daily windspeed [m/s]

rain

precipitation [mm/day]

relativehumidity

Relative humidity; if negative, air vapor density will be approximated [-]

albedo

#albedo: surface albedo or reflectivity [-]

cloudiness

Fraction of the sky covered in clouds,if no value provided, cloudiness will be approximated [-]

forest

Forest or vegeation cover [-]

slope

Slope of the ground [rad]

aspect

Ground aspect [rad from north]

surftemp

surface temperature [C]

surfemissivity

surfice emissivity: [-]

Value

NetEnergy

Surface net energy

.

Examples

# NOT RUN {
## The function is currently defined as
function(lat,Jday,Tx,Tn,wind,relativehumidity,cloudiness,albedo,forest,
slope,aspect,surftemp,surfemissivity){
if(cloudiness<0){cloudiness<-EstCloudiness(lat,Jday,Tx,Tn)}

airtemp<-(Tx+Tn)/2 #average daily air temperature [C]

return(Solar(lat,Jday,Tx,Tn,albedo,forest,slope,aspect)+
Longwave(AtmosphericEmissivity(airtemp,cloudiness),airtemp)-
Longwave(surfemissivity,surftemp)+SensibleHeat(surftemp,airtemp,wind)+
EvapHeat(surftemp,airtemp,relativehumidity,Tn,wind)+
RainHeat(airtemp,rain)+GroundHeat())
  }
# }