sEddyProc_sMDSGapFillAfterUstar {REddyProc}

sEddyProc sMDSGapFillAfterUstar

Description

sEddyProc$sMDSGapFillAfterUstar - MDS gap filling algorithm after u* filtering

Usage

sEddyProc_sMDSGapFillAfterUstar(fluxVar, 
    uStarVar = "Ustar", uStarTh = .self$sGetUstarScenarios()[, 
        c("season", uStarSuffix), drop = FALSE], 
    uStarSuffix = "uStar", isFlagEntryAfterLowTurbulence = FALSE, 
    isFilterDayTime = FALSE, swThr = 10, 
    RgColName = "Rg", ...)

Arguments

fluxVar

Flux variable to gap fill after ustar filtering

uStarVar

Column name of friction velocity u * (ms-1), default 'Ustar'

uStarTh

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 If only one value is given, it is used for all records.

uStarSuffix

Different suffixes required are for different u * scenarios

isFlagEntryAfterLowTurbulence

Set to TRUE for flagging the first entry after low turbulence 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 sEddyProc_sMDSGapFill

Details

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

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

With isFlagEntryAfterLowTurbulence set to TRUE, to be more conservative, in addition to the data acquired when uStar is below the threshold, the first half hour measured with good turbulence conditions after a period with low turbulence is also removed (Papale 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 sEddyProc_sExportResults.

Author(s)

AMM, TW Department for Biogeochemical Integration at MPI-BGC, Jena, Germany <[e-mail]> [cph], Thomas Wutzler <[e-mail]> [aut, cre], Markus Reichstein <[e-mail]> [aut], Antje Maria Moffat <[e-mail]> [aut, trl], Olaf Menzer <[e-mail]> [ctb], Mirco Migliavacca <[e-mail]> [aut], Kerstin Sickel <[e-mail]> [ctb, trl], Ladislav <U+0160>igut <[e-mail]> [ctb]

See Also

• sEddyProc_sEstimateUstarScenarios and link{sEddyProc_sEstUstarThold} for estimating the u* threshold from the data.

• sEddyProc_sMDSGapFillUStarScens for automated gapfilling for several scenarios of u* threshold estimates.