sMDSGapFillAfterUstar: sEddyProc$sMDSGapFillAfterUstar - MDS gap filling algorithm...

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

Description

Calling sMDSGapFill after filtering for (provided) friction velocity u*

Usage

sMDSGapFillAfterUstar(FluxVar.s, UstarVar.s = "Ustar", 
    UstarThres.df = usGetAnnualSeasonUStarMappingFromDistributionResult(sUSTAR$uStarTh), 
    UstarSuffix.s = "WithUstar", FlagEntryAfterLowTurbulence.b = FALSE, 
    isFilterDayTime = FALSE, swThr = 10, RgColName = "Rg", 
    ...)

Arguments

FluxVar.s	Flux variable to gap fill after ustar filtering
UstarVar.s	Column name of friction velocity u* (ms-1), default 'Ustar'
UstarThres.df	data.frame with first column, season names, and second column estimates of uStar Threshold. << Alternatively, a single value to be used as threshold for all records
UstarSuffix.s	Different suffixes required for different u* scenarios
FlagEntryAfterLowTurbulence.b	Set to TRUE for flagging the first entry after low turbulance as bad condition (by value of 2).
isFilterDayTime	Set to TRUE to also filter day-time values, default only filters night-time data
swThr	threshold of solar radiation below which data is marked as night time respiration.
RgColName	Column name of incoming short wave radiation
...	Other arguments passed to sMDSGapFill

Details

The u* threshold(s) are provided with argument UstarThres.df for filtering the conditions of low turbulence. After filtering, the data is gap filled using the MDS algorithm sMDSGapFill.

With isFlagEntryAfterLowTurbulence set to TRUE, to be more conservative, in addition to the data acquired when u* is below the threshold, the first half hour measured with good turbulence conditions after a period with low turbulence is also removed (Papaple et al. 2006).

Value

Vector with quality flag from filtering (here 0: good data, 1: low turbulence, 2: first half hour after low turbulence, 3: no threshold available, 4: missing uStar value) Gap filling results are in sTEMP data frame (with renamed columns) that can be retrieved by sExportResults.

Author(s)

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

See Also

• sMDSGapFillAfterUStarDistr for automated gapfilling for several u* threshold estimates.

• sEstUstarThreshold for estimating the u* threshold from the data.

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