EcoHydRology (version 0.3.7)

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, relativehumidity, cloudiness, albedo, forest, slope, aspect, surftemp, surfemissivity,rain)

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]

relativehumidity

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

cloudiness

Fraction of the sky covered in clouds,if negative, cloudiness will be approximated [-]

albedo

#albedo: surface albedo or reflectivity [-]

forest

Forest or vegeation cover [-]

slope

Slope of the ground [rad]

aspect

Ground aspect [rad from north]

surftemp

surface temperature [C]

surfemissivity

surfice emissivity: [-]

rain

precipitation [mm/day]

Value

• NetEnergy
  Surface net energy
• .

Examples

##---- Should be DIRECTLY executable !! ----
##-- ==>  Define data, use random,
##--	or do  help(data=index)  for the standard data sets.

## 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())
  }