Toward relaxed eddy accumulation measurements of sediment-water exchange in aquatic ecosystems - AgroParisTech Accéder directement au contenu
Article Dans Une Revue Geophysical Research Letters Année : 2017

Toward relaxed eddy accumulation measurements of sediment-water exchange in aquatic ecosystems

Résumé

Solute transport across the sediment-water interface has major implications for water quality and biogeochemical cycling in aquatic ecosystems. Existing measurement techniques, however, are not capable of resolving sediment-water fluxes of most constituents under in situ flow conditions. We investigated whether relaxed eddy accumulation (REA), a micrometeorological technique with conditional sampling of turbulent updrafts and downdrafts, can be adapted to the aquatic environment. We simulated REA fluxes by reanalyzing eddy covariance measurements from a riverine lake. We found that the empirical coefficient that relates mass fluxes to the concentration difference between both REA samples is invariant with scalar and flow and responds as predicted by a joint Gaussian distribution of linearly correlated variables. Simulated REA fluxes differed on average by around 30% from eddy covariance fluxes (mean absolute error). Assessment of the lower quantification limit suggests that REA can potentially be applied for measuring benthic fluxes of a new range of constituents that cannot be assessed by standard eddy covariance methods.
Fichier principal
Vignette du fichier
2017_Geophysical_Research_Letters_Lemaire_feasibility_relaxed_eddy_accumulation.pdf (976.15 Ko) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte
Loading...

Dates et versions

hal-01592668 , version 1 (16-11-2017)

Identifiants

Citer

Bruno J. Lemaire, Christian Noss, Andreas Lorke. Toward relaxed eddy accumulation measurements of sediment-water exchange in aquatic ecosystems. Geophysical Research Letters, 2017, 44 (17), pp.8901-8909. ⟨10.1002/2017GL074625⟩. ⟨hal-01592668⟩
556 Consultations
227 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More