2015
DOI: 10.1002/2014wr015716
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Drivers of atmospheric nitrate processing and export in forested catchments

Abstract: Increased deposition of reactive atmospheric N has resulted in the nitrogen saturation of many forested catchments worldwide. Isotope-based studies from multiple forest sites report low proportions (mean 5 10%) of unprocessed atmospheric nitrate in streams during baseflow, regardless of N deposition or nitrate export rates. Given similar proportions of atmospheric nitrate in baseflow across a variety of sites and forest types, it is important to address the postdepositional drivers and processes that affect at… Show more

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Cited by 64 publications
(113 citation statements)
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References 127 publications
(265 reference statements)
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“…By determining both concentration and the 17 O-excess of stream nitrate, we can quantify unprocessed NO 3 − atm in stream water accurately and precisely. Recent studies on nitrate including unprocessed NO 3 − atm exported from forested catchments via streams during base flow period have revealed that the export flux of unprocessed NO 3 − atm increases in accordance with increases in the stream nitrate concentration (Rose et al, 15 2015a; Rose et al, 2015b;Tsunogai et al, 2014). These results implied that unprocessed NO 3 − atm exported from forested catchments can be used as a tracer to identify the biological processing of nitrate in each catchment area and to clarify the processes regulating nitrate concentrations in stream water.…”
Section: Stream Nitrate Being Exported From Forested Watersheds 10mentioning
confidence: 99%
“…By determining both concentration and the 17 O-excess of stream nitrate, we can quantify unprocessed NO 3 − atm in stream water accurately and precisely. Recent studies on nitrate including unprocessed NO 3 − atm exported from forested catchments via streams during base flow period have revealed that the export flux of unprocessed NO 3 − atm increases in accordance with increases in the stream nitrate concentration (Rose et al, 15 2015a; Rose et al, 2015b;Tsunogai et al, 2014). These results implied that unprocessed NO 3 − atm exported from forested catchments can be used as a tracer to identify the biological processing of nitrate in each catchment area and to clarify the processes regulating nitrate concentrations in stream water.…”
Section: Stream Nitrate Being Exported From Forested Watersheds 10mentioning
confidence: 99%
“…Several types of active radars overcome the drawbacks of optical sensors, although all current systems also have limitations of their own [Smith, 1997;Calmant et al, 2008;Schumann et al, 2009]. Radar altimetry measurements from sensors such as Jason-2 and Envisat provide point-based measurements of river WSEs, which can be used to interpolate slopes and develop stage-discharge relationships [O'Loughlin et al, 2013;Paris et al, 2016]. However, altimeter observations have low spatial and temporal resolutions, with vertical errors of decimeters to meters [Calmant et al, 2008;Biancamaria et al, 2016a;O'Loughlin et al, 2016].…”
Section: Introductionmentioning
confidence: 99%
“…Two recent studies using Δ 17 data reported that NO 3 -N Atm made up 5-10% of total NO 3 -N in streams, groundwater, and/or soils within temperate forest ecosystems [Costa et al, 2011;Tsunogai et al, 2010], whereas Rose et al [2015aRose et al [ , 2015b reported up to~50% NO 3 -N Atm in a stream draining a conifer-dominated watershed. These studies, along with qualitative evidence for NO 3 -N Atm in base flow based on δ 18 O-NO 3 À data [Rose et al, 2015b;Sebestyen et al, 2014], have suggested that the loss of unprocessed, deposited N can occur outside of direct runoff producing events [Curtis et al, 2011]. However, prior studies were not specifically designed to quantify intra-annual and inter-annual variation in the export of NO 3 -N Atm and NO 3 -N Micro in streams during a range of hydrological conditions.…”
Section: Introductionmentioning
confidence: 99%