Articles | Volume 22, issue 7
https://doi.org/10.5194/hess-22-4083-2018
https://doi.org/10.5194/hess-22-4083-2018
Research article
 | 
30 Jul 2018
Research article |  | 30 Jul 2018

Nitrogen attenuation, dilution and recycling in the intertidal hyporheic zone of a subtropical estuary

Sébastien Lamontagne, Frédéric Cosme, Andrew Minard, and Andrew Holloway

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Subject: Biogeochemical processes | Techniques and Approaches: Instruments and observation techniques
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Cited articles

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Short summary
The dual nitrate isotope technique is one of the most commonly used approaches to study the origin and fate of N introduced in aquifers. In this study, we first demonstrate a large attenuation of groundwater N at a former industrial site, especially at the interface between surface and groundwater. We also provide evidence for a switch in the oxygen isotopic signature of groundwater due to this extensive N attenuation. This could be used to better quantify N attenuation processes in aquifers.