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Eddy-covariance flux errors due to biases in gas concentration measurements: origins, quantification and correction

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Figure

Fig. 1. General layout of an infrared gas analyser optical path. Sym-bols and represent optical power in the sample and reference
Fig. 2. Conceptual visualization of how a zero bias in gas absorp-precision bias in the evaluation of density fluctuations (tance (a0) yields an accuracy bias in gas density (ρ0) as well as aδρ ̸=m δρ).Note that δam <δa in Eq
Fig. 3. Relative errorfluctuation ϵf in the estimation of a 0.1 µmol mol−1 CO2 concentration fluctuation (a) and of a 0.1 mmol mol−1 H2O concentration (b) as a function of the baseline concentration (x axis) and of the concentration bias (y axis).
Fig. 4. Percentage errors (y axis) in Fc (a) and LE (b) resulting from various amounts of concentration biases (x axis) applied on a typical mid-day half hour of raw eddy data, characterized by Fc ≈ −23 µmol m−2 s−1; LE ≈ 210 W m−2 and average concentrations of 375 µmol mol−1(CO2) and 13 mmol mol−1(H2O).
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