FREddyPro (version 1.0)

ustarThreshold: Find the u* threshold

Description

Function implementing the methodology by Papale et al. 2006

Usage

ustarThreshold(data, sunset = 19, sunrise = 6)

Arguments

data

The data frame

sunset

Time of sunset as a real number (0-23)

sunrise

Time of sunrise as a real number (0-23)

Details

Air temperature is split into 7 classes and u* within each class is split into 20 classes (see Papale et al. 2006). Sunrise and sunset time is used to define nightime data

References

Papale D, Reichstein M, Aubinet M, Canfora E, Bernhofer C, Kutsch W, Longdoz B, Rambal S, Valentini R, Vesala T & et al. (2006) Towards a standardized processing of Net Ecosystem Exchange measured with eddy covariance technique: algorithms and uncertainty estimation. Biogeosciences, Copernicus GmbH, 3, 571 - 583

Examples

## Load the data
data(fluxes)

## Calculate U* and print on screen
ustar=ustarThreshold(fluxes,sunset=19,sunrise=6)
print(ustar)