ET0_PM {CropWaterBalance}

Reference Evapotranspiration Using the Penman and Monteith Method

Description

Calculates daily reference evapotranspiration amounts using the Penman and Monteith method.

Usage

ET0_PM(Tavg, Tmax, Tmin, Rn, RH, WS, G = NULL, Alt)

Arguments

Tavg

A vector, 1-column matrix or data frame with daily average air temperature.

Tmax

A vector, 1-column matrix or data frame with daily maximum air temperature in Celsius degrees.

Tmin

A vector, 1-column matrix or data frame with daily minimum air temperature in Celsius degrees.

Rn

A vector, 1-column matrix or data frame with daily net radiation in MJ m-2 day-1.

RH

A vector, 1-column matrix or data frame with daily relative Humidity in \%.

WS

A vector, 1-column matrix or data frame with daily wind speed in m s-1.

G

Optional. A vector, 1-column matrix or data frame with daily soil heat flux in MJ m-2 day-1. Default is NULL and if NULL it is assumed to be zero. May be provided by Soil_Heat_Flux

Alt

A single number defining the altitude at crop's location in metres.

Value

A matrix of daily reference evapotranspiration amounts in millimetres.

Examples

# See `?DataForCWB` for more on this data set
Tavg <- DataForCWB[, 2]
Tmax <- DataForCWB[, 3]
Tmin <- DataForCWB[, 4]
Rn <- DataForCWB[, 6]
WS <- DataForCWB[, 7]
RH <- DataForCWB[, 8]
G <- DataForCWB[, 9]
ET0_PM(Tavg = Tavg,
       Tmax = Tmax,
       Tmin = Tmin,
       Rn = Rn,
       RH = RH,
       WS = WS,
       G = G,
       Alt = 700)