gpp_normalized: Normalized GPP

In dpabon/ecofunr: Deriving Ecosystem Functional Properties

Description

Normalized GPP

Usage

gpp_normalized(GPP, fparc = 0.99, fpar, theta, dates, na.rm = T)

Arguments

GPP	GPP time series (half-hourly). Object of the class "vector"
fparc	fpar normalized at (by default) 0.99
fpar	fpar time series (daily). Object of the class "vector"
theta	zenith angle during the solstice
dates	A vector with half-hourly dates of class "Date" or class "numeric" (ISO timestamp). In FLUXNET correspond to the column "TIMESTAMP_START"
na.rm

Details

Normalized Canopy photosythesis computed as in \insertCitekergoat_nitrogen_2008-1ecofunr:

GPP* = GPPmax * (fPARc * cos(θ = 0)) / (fPAR * cos(θ_{s}))

Where:

GPPmax: Quantile 0.985-0.99 of the half-hourly GPP for the period of interest (per day). fPAR: Fraction of absorbed PAR. fPARc: Reference fPAR ofr closed canopy conditions (by default 0.95). \theta_s: The sun elevation at solstice.

Value

A vector of class "numeric".

Examples

#' @references
\insertAllCited{}

dpabon/ecofunr documentation built on July 15, 2020, 12:58 p.m.