stability.parameter: Stability Parameter "zeta"

In bigleaf: Physical and Physiological Ecosystem Properties from Eddy Covariance Data

Stability Parameter "zeta"

Description

calculates "zeta", a parameter characterizing stratification in the lower atmosphere.

Usage

stability.parameter(
  data,
  Tair = "Tair",
  pressure = "pressure",
  ustar = "ustar",
  H = "H",
  zr,
  d,
  constants = bigleaf.constants()
)

Arguments

data	Data.frame or matrix containing all required variables
Tair	Air temperature (degC)
pressure	Atmospheric pressure (kPa)
ustar	Friction velocity (m s-1)
H	Sensible heat flux (W m-2)
zr	Instrument (reference) height (m)
d	Zero-plane displacement height (m)
constants	Kelvin - conversion degree Celsius to Kelvin cp - specific heat of air for constant pressure (J K-1 kg-1) k - von Karman constant (-) g - gravitational acceleration (m s-2)

Details

The stability parameter ζ is given by:

ζ = (zr - d) / L

where L is the Monin-Obukhov length (m), calculated from the function Monin.Obukhov.length. The displacement height d can be estimated from the function roughness.parameters.

Value

ζ - stability parameter zeta (-)

Examples

df <- data.frame(Tair=25,pressure=100,ustar=seq(0.2,1,0.1),H=seq(40,200,20))
stability.parameter(df,zr=40,d=15)

bigleaf documentation built on Aug. 22, 2022, 9:09 a.m.