reference.ET: Reference Evapotranspiration

Description

Reference evapotranspiration calculated from the Penman-Monteith equation with a prescribed surface conductance. This function is deprecated. Use potential.ET(...,approach="Penman-Monteith") instead.

Usage

reference.ET(
  data,
  Gs_ref = 0.0143,
  Tair = "Tair",
  pressure = "pressure",
  VPD = "VPD",
  Rn = "Rn",
  Ga = "Ga_h",
  G = NULL,
  S = NULL,
  missing.G.as.NA = FALSE,
  missing.S.as.NA = FALSE,
  Esat.formula = c("Sonntag_1990", "Alduchov_1996", "Allen_1998"),
  constants = bigleaf.constants()
)

Arguments

data: Data.frame or matrix containing all required variables; optional
Gs_ref: Reference surface conductance (m s-1); defaults to 0.0143 m s-1.
Tair: Air temperature (degC)
pressure: Atmospheric pressure (kPa)
VPD: Vapor pressure deficit (kPa)
Rn: Net radiation (W m-2)
Ga: Aerodynamic conductance to heat/water vapor (m s-1)
G: Ground heat flux (W m-2); optional
S: Sum of all storage fluxes (W m-2); optional
missing.G.as.NA: if TRUE, missing G are treated as NAs, otherwise set to 0.
missing.S.as.NA: if TRUE, missing S are treated as NAs, otherwise set to 0.
Esat.formula: Optional: formula to be used for the calculation of esat and the slope of esat. One of "Sonntag_1990" (Default), "Alduchov_1996", or "Allen_1998". See Esat.slope.
constants: cp - specific heat of air for constant pressure (J K-1 kg-1)
eps - ratio of the molecular weight of water vapor to dry air
Rd - gas constant of dry air (J kg-1 K-1) (only if approach = "Penman-Monteith")
Rgas - universal gas constant (J mol-1 K-1) (only if approach = "Penman-Monteith")
Kelvin - conversion degree Celsius to Kelvin (only if approach = "Penman-Monteith")