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Measurements of eddy correlation oxygen fluxes in shallow freshwaters: Towards routine applications and analysis

Authors
Berg, Peter
Brand, Andreas
Lorrai, Claudia
Edmonds, Theresa J.
Wüest, Alfred
Published in Geophysical Research Letters. 2008, vol. 35, no. 4, p. L04403
Abstract Benthic fluxes of dissolved oxygen are measured in a shallow reservoir using the eddy correlation technique. Flux variations depict the diurnal production-consumption cycle, with daytime oxygen release following the solar radiation trend. The average nighttime uptake of -40 +/- 11 mmol m-2 d-1 is in excellent agreement with the rate of -35 +/- 3 mmol m-2 d-1 derived from sediment oxygen microprofiles. Separating large-scale advective and turbulent fluctuations is a crucial and uncertain component of the flux computation and the largest source of error. To compensate for the 2.25 s oxygen sensor response time, the oxygen flux calculations are corrected by only ~5% using a first-order spectral enhancement. This work demonstrates that only a slightly faster oxygen sensor would be needed to resolve the entire flux spectrum. The 18 hours of data are the first measurements obtained in a freshwater reservoir that capture the diurnal oxygen production-consumption cycle.
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MCGINNIS, Daniel Frank et al. Measurements of eddy correlation oxygen fluxes in shallow freshwaters: Towards routine applications and analysis. In: Geophysical Research Letters, 2008, vol. 35, n° 4, p. L04403. https://archive-ouverte.unige.ch/unige:40697

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Deposited on : 2014-10-06

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