2014
DOI: 10.5194/amt-7-4237-2014
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Prerequisites for application of hyperbolic relaxed eddy accumulation on managed grasslands and alternative net ecosystem exchange flux partitioning

Abstract: Abstract.Relaxed eddy accumulation is still applied in ecosystem sciences for measuring trace gas fluxes. On managed grasslands, the length of time between management events and the application of relaxed eddy accumulation has an essential influence on the determination of the proportionality factor b and thus on the resulting flux. In this study this effect is discussed for the first time. Also, scalar similarity between proxy scalars and scalars of interest is affected until the ecosystem has completely reco… Show more

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Cited by 14 publications
(7 citation statements)
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References 105 publications
(143 reference statements)
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“…Ignoring these spikes, a satisfactory agreement to eddy covariance was determined, but the unsystematic errors made the results critical for detailed investigations. Conditional sampling may be applied for nearly steady-state data sets and can be used as a tool to see the effects of periodic coherent structures on the flux as was done by Thomas and Foken (2007) or to analyse the coefficients for relaxed eddy accumulation (Riederer et al, 2014).…”
Section: Discussionmentioning
confidence: 99%
“…Ignoring these spikes, a satisfactory agreement to eddy covariance was determined, but the unsystematic errors made the results critical for detailed investigations. Conditional sampling may be applied for nearly steady-state data sets and can be used as a tool to see the effects of periodic coherent structures on the flux as was done by Thomas and Foken (2007) or to analyse the coefficients for relaxed eddy accumulation (Riederer et al, 2014).…”
Section: Discussionmentioning
confidence: 99%
“…Ignoring these spikes, a satisfactory agreement to eddy covariance was determined, but the unsystematic errors made the results critical for detailed investigations. Conditional sampling may be applied for nearly steady-state data sets and can be used as a tool to see the effects of periodic coherent structures on the flux as was done by Thomas and Foken (2007) or to analyse the coefficients for relaxed eddy accumulation (Riederer et al, 2014).…”
Section: Discussionmentioning
confidence: 99%
“…First they were used to detect jumps of turbulent motions (Mahrt, 1991) or the duration of turbulent events including filtering analysis (Collineau and Brunet, 1993a, b). The application of the spectra of the wavelet coefficient (Collineau and Brunet, 1993b;Treviño and Andreas, 1996) offered also the possibility to determine turbulent fluxes (Katul and Parlange, 1995;Handorf and Foken, 1997;Saito and Asanuma, 2008). With the availability of wavelet software packages in the last 20 years all these methods have become more popular, and have been used for applications such as the detection of turbulent structures (Thomas and Foken, 2005) or turbulent fluxes of aircraft measurements (Strunin and Hiyama, 2004) and at forested sites (Thomas and Foken, 2007).…”
Section: Introductionmentioning
confidence: 99%
“…The β 0 method is based on the strong assumption that the proxy scalar and the scalar of interest behave similarly in their exchange mechanism, which requires the vertical and horizontal distribution of the sinks and sources of both scalars to be identical. A violation of this assumption will inevitably lead to large errors in the REA flux estimate (Katul et al, 1995;Katul and Hsieh, 1999;Ruppert et al, 2006;Riederer et al, 2014). The similarity between the scalar of interest and the scalar chosen as a proxy can be evaluated by examining the correlation coefficients between the highresolution time series of two scalars, if available.…”
Section: Introductionmentioning
confidence: 99%
“…The scalar-scalar correlation coefficients, r cs , as used in other publications (e.g. Gao, 1995;Katul and Hsieh, 1999;Ruppert et al, 2006;Riederer et al, 2014), are defined as follows:…”
Section: Introductionmentioning
confidence: 99%