partitionNEEGL: partitionNEEGL

In REddyProc: Data processing and plotting utilities of (half-)hourly eddy-covariance measurements

Description

Partitioning NEE fluxes into GP and Reco after daytime method of Lasslop et al. (2010) daytime-based partitioning of measured net ecosystem fluxes into gross primary production (GPP) and ecosystem respiration (Reco)

Usage

partitionNEEGL(ds, NEEVar.s = paste0("NEE", SuffixDash.s, 
    "_f"), QFNEEVar.s = paste0("NEE", SuffixDash.s, 
    "_fqc"), QFNEEValue.n = 0, NEESdVar.s = paste0("NEE", 
    SuffixDash.s, "_fsd"), TempVar.s = paste0("Tair_f"), 
    QFTempVar.s = paste0("Tair_fqc"), QFTempValue.n = 0, 
    VPDVar.s = paste0("VPD_f"), QFVPDVar.s = paste0("VPD_fqc"), 
    QFVPDValue.n = 0, RadVar.s = "Rg", PotRadVar.s = "PotRad_NEW", 
    Suffix.s = "", controlGLPart = partGLControl(), 
    isVerbose = TRUE, nRecInDay = 48L)

Arguments

ds	dataset with all the specified input columns and full days in equidistant times
NEEVar.s	Variable of Net Ecosystem Exchange flux
QFNEEVar.s	Quality flag of variable
QFNEEValue.n	Value of quality flag for _good_ (original) data
NEESdVar.s	Variable of standard deviation of net ecosystem fluxes
TempVar.s	Filled air or soil temperature variable (degC)
QFTempVar.s	Quality flag of filled temperature variable
QFTempValue.n	Value of temperature quality flag for _good_ (original) data
VPDVar.s	Filled Vapor Pressure Deficit - VPD - (hPa)
QFVPDVar.s	Quality flag of filled VPD variable
QFVPDValue.n	Value of VPD quality flag for _good_ (original) data
RadVar.s	Unfilled (original) radiation variable
PotRadVar.s	Variable name of potential radiation (W/m2)
Suffix.s	string inserted into column names before identifier (see sMDSGapFillAfterUstar).
controlGLPart	further default parameters, see partGLControl
isVerbose	set to FALSE to suppress output messages
nRecInDay	number of records within one day (for half-hourly data its 48)

Value

data.frame with columns

Reco_DT_<suffix>	predicted ecosystem respiraiton: mumol CO2/m2/second
GPP_DT_<suffix>	predicted gross primary production mumol CO2/m2/second
FP_VARnight	NEE filtered for nighttime records (others NA)
FP_VARday	NEE filtered for daytime recores (others NA)
NEW_FP_Temp	temperature after filtering for quality flag degree Celsius
NEW_FP_VPD	vapour pressure deficit after filtering for quality flag, hPa
FP_R_refNight	basal respiration estimated from LRC of daytime window (W/m2)
FP_R_ref	basal respiration estimated from LRC of daytime window (W/m2)
FP_E0	temperature sensitivity estimated from nighttime NEE window in Kelvin (degK)
FP_alpha	canopy light utilization efficiency and represents the initial slope of the light-response curve (mumol s-1 W)
FP_beta	maximum CO2 uptake rate of the canopy at light saturation (mumol m-2 s-1)
FP_k	parameter controlling the VPD limitation of GPP
FP_qc	quality flag: 0: good parameter fit, 1: some parameters out of range, required refit, 2: next parameter estimate is more than two weeks away
FP_dRecPar	records until or after closest record that has a parameter estimate associated Light response curve parameters FP_X are estimated for windows, and are reported with the first record of the window

Author(s)

MM, TW (Department for Biogeochemical Integration at MPI-BGC, Jena, Germany)

References

Lasslop G, Reichstein M, Papale D, et al. (2010) Separation of net ecosystem exchange into assimilation and respiration using a light response curve approach: critical issues and global evaluation. Global Change Biology, Volume 16, Issue 1, Pages 187-208

See Also

partGLFitLRCWindows

partGLInterpolateFluxes

REddyProc documentation built on May 2, 2019, 5:19 p.m.