Groundwater N&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt;O emission factors of nitrate-contaminated aquifers as derived from denitrification progress and N&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt;O accumulation

Weymann, Daniel; Well, Reinhard; Flessa, Heinz; Heide, C. von der; Deurer, M.; Meyer, Knut; Konrad, Christopher P.; Walther, Wolfgang

doi:10.5194/bg-5-1215-2008

Cited by 89 publications

(88 citation statements)

References 41 publications

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“…These results are consistent with those of Weymann et al (2008) Kolle et al (1985) and Weymann et al (2010) postulated that high NO 3 --N removal in autotrophic denitrification zones was most likely caused by practically anoxic conditions and the presence of highly reactive microcrystalline pyrite. In the present study, the temporal variation of excess N 2 -N was low relative to site variability, with higher concentrations from July to October than at other times of the year.…”

Section: Groundwater Complete Denitrification: Excess N 2 -Nsupporting

confidence: 91%

“…Excess N 2 -N concentrations in our study sites were lower than those reported by Weymann et al (2008). Maximum values in the present study were between 5.60 -8.69 mg N L -1 at the L1 and L2 sites and were associated with high RP values (between 0.97 -0.99) at the interface and bedrock zones.…”

Section: Groundwater Complete Denitrification: Excess N 2 -Ncontrasting

confidence: 74%

“…The partial pressures of N 2 O-N in equilibrated headspace and water were calculated using its solubility (Weiss, 1970) at the recharge temperature as measured at the interface between the unsaturated zone and the groundwater surface. Denitrified N 2 -N, presented as excess N 2 -N (Heaton and Vogel, 1981), was estimated following the method described by Weymann et al (2008). …”

Section: Estimating Dissolved N 2 O-n and Excess N 2 -Nmentioning

confidence: 99%

“…The N 2 O-N EF 5 g for indirect N 2 O-N emissions from groundwater was estimated using the method described by Weymann et al, (2008) and calculated using Equation 3:…”

Section: Progress (Rp)mentioning

confidence: 99%

“…Mean N 2 O-N EF 5 g(2) based on ambient NO 3 --N ranged from 0.003 at the H2 site to 0.029 at the L2 site (Table 2). Using the method proposed by Weymann et al (2008), the N 2 O-N EF 5 g(1) ranged from 0.003 at L to 0.004 at H sites (Table 2). The EF 5 g according to the farm balance approach was similar to the EF 5 g(1).…”

mentioning

confidence: 99%

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Denitrification and indirect N2O emissions in groundwater: Hydrologic and biogeochemical influences

Jahangir

Johnston

Barrett

et al. 2013

Journal of Contaminant Hydrology

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Identification of specific landscape areas with high and low groundwater denitrification potential is critical for improved management of agricultural nitrogen (N) export to ground and surface waters and indirect nitrous oxide (N 2 O) emissions. Denitrification products together with concurrent hydrogeochemical properties were analysed over two years at three depths at two low (L) and two high (H) permeability agricultural sites in Ireland. Mean N 2 O-N at H sites were significantly higher than L sites, and decreased with depth. Conversely, excess N 2 -N were significantly higher at L sites than H sites and did not vary with depth. Denitrifier functional genes were similar at all sites and depths. Data showed that highly favourable conditions prevailed for denitrification to occur -multiple electron donors, low redox potential (Eh <100 mV), low DO (<2 mg L -1 ), low permeability (k s <0.005 m d -1 ) and a shallow unsaturated zone (<2 m). Quantification of excess N 2 -N in groundwater helps to close N balances at the local, regional and global scales.

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Section: Groundwater Complete Denitrification: Excess N 2 -Nsupporting

confidence: 91%

Section: Groundwater Complete Denitrification: Excess N 2 -Ncontrasting

confidence: 74%

Section: Estimating Dissolved N 2 O-n and Excess N 2 -Nmentioning

confidence: 99%

“…The N 2 O-N EF 5 g for indirect N 2 O-N emissions from groundwater was estimated using the method described by Weymann et al, (2008) and calculated using Equation 3:…”

Section: Progress (Rp)mentioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations

Denitrification and indirect N2O emissions in groundwater: Hydrologic and biogeochemical influences

Jahangir

Johnston

Barrett

et al. 2013

Journal of Contaminant Hydrology

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Quantifying an aquifer nitrate budget and future nitrate discharge using field data from streambeds and well nests

Gilmore

Genereux

Solomon

et al. 2016

Water Resources Research

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Novel groundwater sampling (age, flux, and nitrate) carried out beneath a streambed and in wells was used to estimate (1) the current rate of change of nitrate storage, dSNO3/dt, in a contaminated unconfined aquifer, and (2) future [ NO3−]FWM (the flow‐weighted mean nitrate concentration in groundwater discharge) and fNO3 (the nitrate flux from aquifer to stream). Estimates of dSNO3/dt suggested that at the time of sampling (2013) the nitrate storage in the aquifer was decreasing at an annual rate (mean = −9 mmol/m2yr) equal to about one‐tenth the rate of nitrate input by recharge. This is consistent with data showing a slow decrease in the [ NO3−] of groundwater recharge in recent years. Regarding future [ NO3−]FWM and fNO3, predictions based on well data show an immediate decrease that becomes more rapid after ∼5 years before leveling out in the early 2040s. Predictions based on streambed data generally show an increase in future [ NO3−]FWM and fNO3 until the late 2020s, followed by a decrease before leveling out in the 2040s. Differences show the potential value of using information directly from the groundwater—surface water interface to quantify the future impact of groundwater nitrate on surface water quality. The choice of denitrification kinetics was similarly important; compared to zero‐order kinetics, a first‐order rate law levels out estimates of future [ NO3−]FWM and fNO3 (lower peak, higher minimum) as legacy nitrate is flushed from the aquifer. Major fundamental questions about nonpoint‐source aquifer contamination can be answered without a complex numerical model or long‐term monitoring program.

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Denitrification in Shallow Groundwater Below Different Arable Land Systems in a High Nitrogen‐Loading Region

Zhou

Well³

et al. 2018

JGR Biogeosciences

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To evaluate the risk of nitrate (NO3−‐N) in groundwater, it is necessary to know the denitrification capacity. In this study, observations were carried out for 2 years to investigate the groundwater denitrification capacity below three arable land systems in eastern China. Denitrification capacity was assessed by measuring the concentration and distribution patterns of nitrous oxide (N2O) and dinitrogen (N2) in groundwater. The results revealed that groundwater denitrification activity was high and consumed 76%, 83%, and 65% of the NO3−‐N in the vineyard (VY), vegetable field (VF), and paddy field (PF), respectively. The high denitrification activity might be attributed to the strong reducing conditions, with high dissolved carbon concentrations in groundwater, which promotes denitrification. During the sampling period, we observed high dinitrogen (excess N2) accumulation in groundwater, which exceeded the total reactive nitrogen (N) in the deep layer. The large amount of excess N2 observed in VY and VF indicated that considerable N was stored as gaseous N2 in groundwater and should not be ignored when balancing N budgets in aquifers where denitrification is high.

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Groundwater N<sub>2</sub>O emission factors of nitrate-contaminated aquifers as derived from denitrification progress and N<sub>2</sub>O accumulation

Cited by 89 publications

References 41 publications

Denitrification and indirect N2O emissions in groundwater: Hydrologic and biogeochemical influences

Denitrification and indirect N2O emissions in groundwater: Hydrologic and biogeochemical influences

Quantifying an aquifer nitrate budget and future nitrate discharge using field data from streambeds and well nests

Denitrification in Shallow Groundwater Below Different Arable Land Systems in a High Nitrogen‐Loading Region

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