Controls on Nitrous Oxide Production in, and Fluxes from a Coastal Aquifer in Long Island, NY, USA

Young, Caitlin; Martin, Jonathan B.; Hanson, Gilbert N.

doi:10.3390/jmse4040071

Cited by 2 publications

(1 citation statement)

References 50 publications

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“…For samples in which denitrification was not detected, the NO 3 initial was assumed to equal measured NO 3 -. NO 3 initial calculation was based on the assumption that denitrification is the main process responsible for nitrogen transformations on Long Island, NY, USA (Young et al, 2016) and other processes such as (dissimilatory nitrate reduction to ammonium) DNRA, nitrification, remineralization, and anammox (Smith et al, 2015) were not considered.…”

Section: Determining R Temp Calculating N 2den Excess Air No 3 Imentioning

confidence: 99%

Depth of the vadose zone controls aquifer biogeochemical conditions and extent of anthropogenic nitrogen removal

Szymczycha

Kroeger²,

Crusius³

et al. 2017

Water Research

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We investigated biogeochemical conditions and watershed features controlling the extent of nitrate removal through microbial dinitrogen (N) production within the surficial glacial aquifer located on the north and south shores of Long Island, NY, USA. The extent of N production differs within portions of the aquifer, with greatest N production observed at the south shore of Long Island where the vadose zone is thinnest, while limited N 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 N 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 N production. Since quantification of excess N relies on knowledge of equilibrium N 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.

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Section: Determining R Temp Calculating N 2den Excess Air No 3 Imentioning

confidence: 99%

Depth of the vadose zone controls aquifer biogeochemical conditions and extent of anthropogenic nitrogen removal

Szymczycha

Kroeger²,

Crusius³

et al. 2017

Water Research

View full text Add to dashboard Cite

show abstract

Transport and reactivity of nitrous oxide and methane in two contrasting subterranean estuaries

Calvo‐Martin,

de la Paz,

Álvarez‐Salgado

et al. 2024

Limnology & Oceanography

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Continental groundwaters are commonly enriched in nitrous oxide (N2O) and methane (CH4), which can discharge into the coast. The contribution of this diffuse source to coastal N2O and CH4 emissions largely depends on the biogeochemical processes of coastal aquifer exit zones, known as subterranean estuaries. Here, we study the role of subterranean estuaries in modulating N2O and CH4 exports toward the coast. The two studied subterranean estuaries are located at Panxón and Ladeira beaches (Ría de Vigo, NW Iberian Peninsula) and had opposite oxygenation at their interior. Groundwater‐borne N2O was detected in the oxygenated subterranean estuary of Panxón Beach, although denitrification attenuated N2O before porewater was discharged into the coast. An N2O hotspot was detected at about 50 cm depth in this subterranean estuary, characterized by the presence of nitrate under suboxic conditions. This N2O also seems to be consumed along the flow path before discharging into the coast. The anoxic subterranean estuary of Ladeira Beach completely removed groundwater‐borne N2O. Yet, nitrification within its suboxic upper saline plume produced and exported N2O toward the coast, hiding the role of this subterranean estuary as an N2O sink. The anoxic subterranean estuary exported CH4 toward the coast. This CH4 was not sourced by continental groundwater, hence it was produced in situ fuelled by the accumulation of organic matter within the beach. The suboxic upper saline plume in Ladeira Beach and the oxygenated subterranean estuary of Panxón Beach acted as CH4 sinks.

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Controls on Nitrous Oxide Production in, and Fluxes from a Coastal Aquifer in Long Island, NY, USA

Cited by 2 publications

References 50 publications

Depth of the vadose zone controls aquifer biogeochemical conditions and extent of anthropogenic nitrogen removal

Depth of the vadose zone controls aquifer biogeochemical conditions and extent of anthropogenic nitrogen removal

Transport and reactivity of nitrous oxide and methane in two contrasting subterranean estuaries

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