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dc.contributor.authorSzymczycha, Beata  Concept link
dc.contributor.authorKroeger, Kevin D.  Concept link
dc.contributor.authorCrusius, John  Concept link
dc.contributor.authorBratton, John F.  Concept link
dc.description© The Author(s), 2017. This is the author's version of the work and is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Water Research 123 (2017): 794-801, doi:10.1016/j.watres.2017.06.048.en_US
dc.description.abstractWe investigated biogeochemical conditions and watershed features controlling the extent of nitrate removal through microbial dinitrogen (N2) production within the surficial glacial aquifer located on the north and south shores of Long Island, NY, USA. The extent of N2 production differs within portions of the aquifer, with greatest N2 production observed at the south shore of Long Island where the vadose zone is thinnest, while limited N2 production occurred under the thick vadose zones on the north shore. In areas with a shallow water table and thin vadose zone, low oxygen concentrations and sufficient DOC concentrations are conducive to N2 production. Results support the hypothesis that in aquifers without a significant supply of sediment-bound reducing potential, vadose zone thickness exerts an important control of the extent of N2 production. Since quantification of excess N2 relies on knowledge of equilibrium N2 concentration at recharge, calculated based on temperature at recharge, we further identify several features, such as land use and cover, seasonality of recharge, and climate change that should be considered to refine estimation of recharge temperature, its deviation from mean annual air temperature, and resulting deviation from expected equilibrium gas concentrations.en_US
dc.description.sponsorshipProject supported by the Polish-U.S. Fulbright Commission, the USGS Coastal and Marine Geology Program, the National Fish and Wildlife Foundation, and the USGS/National Park Service Water-Quality Assessment and Monitoring program.en_US
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International*
dc.subjectExcess airen_US
dc.subjectRecharge temperatureen_US
dc.subjectGroundwater dischargeen_US
dc.subjectDissolved organic carbonen_US
dc.titleDepth of the vadose zone controls aquifer biogeochemical conditions and extent of anthropogenic nitrogen removalen_US

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Attribution-NonCommercial-NoDerivatives 4.0 International
Except where otherwise noted, this item's license is described as Attribution-NonCommercial-NoDerivatives 4.0 International