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- W4233000269 abstract "Abstract. Sediment-water oxygen fluxes are widely used as a proxy for organic carbon production and mineralization at the seafloor. In-situ fluxes can be measured non-invasively with the aquatic eddy covariance technique, but a main weakness of the commonly used instrumentation is the susceptibility of the delicate oxygen microsensors required for the high frequency measurements to disturbances. Even small changes in sensor characteristics during deployment as caused e.g. by biofouling can result in erroneous flux data. Here we present a dual-optode eddy covariance instrument (2OEC) with two fast oxygen fiber sensors and document how erroneous flux interpretations and data loss can effectively be reduced by this hardware and a new data analysis approach. With deployments over a carbonate sandy sediment in the Florida Keys and comparison with parallel benthic advection-chamber incubations, we demonstrate the improved data quality and data reliability facilitated by the instrument and associated data processing. Short-term changes in flux that are questionable in single oxygen sensor instruments can be confirmed or rejected with the 2OEC and in our deployments provided new insights into the temporal dynamics of benthic oxygen flux in permeable carbonate sands. With the 2OEC, reliable benthic flux data can be generated within a couple of hours, making this technique suitable for mapping sediment-water, intra-water column, or atmosphere-water fluxes." @default.
- W4233000269 created "2022-05-12" @default.
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- W4233000269 date "2020-05-26" @default.
- W4233000269 modified "2023-10-17" @default.
- W4233000269 title "Technical note: Measurements and data analysis of sediment-water oxygen flux using a new dual-optode eddy covariance instrument" @default.
- W4233000269 doi "https://doi.org/10.5194/bg-2020-172" @default.
- W4233000269 hasPublicationYear "2020" @default.
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