Results 1 to 10 of about 53,109 (325)
First eddy covariance flux measurements by PTR-TOF [PDF]
Atmospheric Measurement Techniques, 2010 The recently developed PTR-TOF instrument was evaluated to measure methanol fluxes emitted from grass land using the eddy covariance method. The high time resolution of the PTR-TOF allowed storing full mass spectra up to <i>m/z</i> 315 with a
M. Müller +10 more
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The use of disjunct eddy sampling methods for the determination of ecosystem level fluxes of trace gases [PDF]
Atmospheric Chemistry and Physics, 2009 The concept of disjunct eddy sampling (DES) for use in measuring ecosystem-level micrometeorological fluxes is re-examined. The governing equations are discussed as well as other practical considerations and guidelines concerning this sampling method as ...
A. A. Turnipseed +8 more
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A performance evaluation of despiking algorithms for eddy covariance data. [PDF]
Sci Rep, 2021 AbstractSpike detection for raw high-frequency eddy covariance time series is a challenging task because of the confounding effect caused by complex dynamics and the high level of noise affecting such data. To cope with these features, a new despiking procedure rooted on robust functionals is proposed.
Vitale D.
europepmc +6 more sources
Lag time determination in DEC measurements with PTR-MS [PDF]
Atmospheric Measurement Techniques, 2010 The disjunct eddy covariance (DEC) method has emerged as a popular technique for micrometeorological flux measurements of volatile organic compounds (VOCs).
R. Taipale, T. M. Ruuskanen, J. Rinne
doaj +4 more sources
Ergodicity test of the eddy-covariance technique [PDF]
Atmospheric Chemistry and Physics, 2015 The ergodic hypothesis is a basic hypothesis typically invoked in atmospheric surface layer (ASL) experiments. The ergodic theorem of stationary random processes is introduced to analyse and verify the ergodicity of atmospheric turbulence measured using ...
J. Chen, Y. Hu, Y. Yu, S. Lü
doaj +4 more sources
Some aspects of the energy balance closure problem [PDF]
Atmospheric Chemistry and Physics, 2006 After briefly discussing several reasons for the energy balance closure problem in the surface layer, the paper focuses on the influence of the low frequency part of the turbulence spectrum on the residual. Changes in the turbulent fluxes in this part of
T. Foken +4 more
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Standardization of KoFlux Eddy-Covariance Data Processing [PDF]
Korean Journal of Agricultural and Forest Meteorology, 2009 The standardization of eddy-covariance data processing is essential for the analysis and synthesis of vast amount of data being accumulated through continuous observations in various flux measurement networks. End users eventually benefit from the open and transparent standardization protocol by clear understanding of final products such as ...
Jinkyu Hong +5 more
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Eddy Covariance Calculation Revisited with Wavelet Cospectra
SOLA, 2008 In this paper, the calculation of eddy covariance flux is reevaluated with newly-emerged capability of the wavelet transform. It is demonstrated that the wavelet transform clearly revealed the cospectral gap that separates turbulent and mesoscale motions with the data collected over a rice and a larch forest.
Makoto Saito, Jun Asanuma
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Eddy covariance for quantifying trace gas fluxes from soils [PDF]
SOIL, 2015 Soils are highly complex physical and biological systems, and hence measuring soil gas exchange fluxes with high accuracy and adequate spatial representativity remains a challenge. A technique which has become increasingly popular is the eddy covariance (
W. Eugster, L. Merbold
doaj +8 more sources
, 2012 In the 1970s, scientists met with difficulties in estimating fluxes over tall vegetation, like forests, using flux-gradient relationship (Raupach 1979). The roughness of the exchanging surface drive to efficient turbulent mixing reducing the concentration gradient and invalidating Monin-Obukhov similarity theory (Lenschow 1995).
Longdoz, Bernard, Granier, André
+9 more sources