interdep: Apply Flux Interdependency Quality Control Scheme
In grahamstewart12/tidyflux:

Description Usage Arguments Details Value References

Interdependency of H, LE and NEE QC flags due to corrections/conversions.

1	interdep(data, qc_le, qc_h = NULL, irga = c("open", "en_closed"))

`qc_le`	An atomic type containing numeric or NA values. Combination of all available QC flags for LE.
`qc_h`	An atomic type containing numeric or NA values. Combination of all available QC flags for H. Used only if `irga = "open"`.
`irga`	A character string specifying the type of irga. Allowed values are `"en_closed"` both for closed and enclosed path systems and `"open"` for open path systems. Can be abbreviated.

Flux interdependency is an additive QC flag correction. Results follow the QC scheme using QC flag range 0 - 2. Returned data frame follows the 'Naming Strategy' described in extract_QC. Returned QC flags have QC suffix interdep.

To convert buoyancy flux to sensible heat flux (SND or Schotanus correction), reliable measurements of LE must be available. To correct LE and NEE estimated by open-path IRGA (IRGA = "open") for the effects of density fluctuations due to temperature and humidity fluctuations (WPL or Webb correction), reliable measurements of H must be available. To perform WPL correction of NEE estimated with any kind of IRGA, reliable measurements of LE must be available. Thus following set of rules apply:

If IRGA = "en_closed"

If qc_LE == 2 | is.na(qc_LE) == TRUE: qc_H and qc_NEE flags are increased by 1.

If IRGA = "open"

if qc_LE == 2 | is.na(qc_LE) == TRUE: qc_H flags are increased by 1.
If qc_H == 2 | is.na(qc_H) == TRUE: qc_LE flags are increased by 1.
If qc_H == 2 | is.na(qc_H) == TRUE | qc_LE == 2 | is.na(qc_LE) == TRUE: qc_NEE flags are increased by 1.

A data frame. Each column has attributes "varnames" and "units".

Mauder, M., Cuntz, M., Drue, C., Graf, A., Rebmann, C., Schmid, H.P., Schmidt, M., Steinbrecher, R., 2013. A strategy for quality and uncertainty assessment of long-term eddy-covariance measurements. Agric. For. Meteorol. 169, 122-135. doi:10.1016/j.agrformet.2012.09.006

grahamstewart12/tidyflux documentation built on June 4, 2019, 7:44 a.m.