Nitrous oxide emissions to the atmosphere from an artificially oxygenated lake

Mengis, Martin; Gächter, René; Wehrli, Bernhard

doi:10.4319/lo.1996.41.3.0548

Cited by 35 publications

(24 citation statements)

References 5 publications

(7 reference statements)

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“…Only N 2 O concentrations at the surface deviate from the equilibrium concentrations. N 2 O production has not been measured, but we assume the conditions in high alpine lakes are not favourable for N 2 O production, as low oxygen concentrations (Mengis et al 1996) or steep oxygen gradients are required (Huttunen et al 2003b) for N 2 O production in lakes. Both prerequisites are absent in the reservoirs we investigated.…”

Section: Nitrous Oxide Emissionsmentioning

confidence: 99%

Greenhouse gas emissions (CO2, CH4, and N2O) from several perialpine and alpine hydropower reservoirs by diffusion and loss in turbines

et al. 2012

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Section: Nitrous Oxide Emissionsmentioning

confidence: 99%

Greenhouse gas emissions (CO2, CH4, and N2O) from several perialpine and alpine hydropower reservoirs by diffusion and loss in turbines

et al. 2012

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“…5c). Mengis et al (1996), for example, measured net benthic N 2 O fluxes of 458-542 nmol Wenk, 2013). At the beginning of the water column overturn in January 2011, together with the breakdown of the O 2 gradient, small amounts of O 2 (11 µmol L −1 O 2 ) were measured in bottom waters, and again, significantly (p = 0.007) lower benthic N 2 O fluxes than during fully anoxic conditions were observed.…”

Section: Water Column Characteristicsmentioning

confidence: 99%

“…They also highlight that factors influencing N 2 O production pathways in the benthic environment are still not clearly identified, particularly with regard to the relative importance of nitrification, nitrifier denitrification, and denitrification (Mengis et al, 1996;Liikanen et al, 2003b;Liikanen and Martikainen, 2003;McCrackin and Elser, 2010).…”

Section: V Freymond Et Al: Year-round N 2 O Production By Benthimentioning

confidence: 99%

Year-round N<sub>2</sub>O production by benthic NO<sub>x</sub> reduction in a monomictic south-alpine lake

et al. 2013

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Abstract. Nitrous oxide (N 2 O) is a potent greenhouse gas, generated through microbial nitrogen (N) turnover processes, such as nitrification, nitrifier denitrification, and denitrification. Previous studies quantifying natural sources have mainly focused on soils and the ocean, but the potential role of terrestrial water bodies in the global N 2 O budget has been widely neglected. Furthermore, the biogeochemical controls on the production rates and the microbial pathways that produce benthic N 2 O in lakes are essentially unknown. In this study, benthic N 2 O fluxes and the contributions of the microbial pathways that produce N 2 O were assessed using 15 N label flow-through sediment incubations in the eutrophic, monomictic south basin of Lake Lugano in Switzerland. The sediments were a significant source of N 2 O throughout the year, with production rates ranging between 140 and 2605 nmol N 2 O h −1 m −2 , and the highest observed rates coinciding with periods of water column stratification and stably anoxic conditions in the overlying bottom water. Nitrate (NO − 3 ) reduction via denitrification was found to be the major N 2 O production pathway in the sediments under both oxygen-depleted and oxygen-replete conditions in the overlying water, while ammonium oxidation did not contribute significantly to the benthic N 2 O flux. A marked portion (up to 15 %) of the total NO − 3 consumed by denitrification was reduced only to N 2 O, without complete denitrification to N 2 . These fluxes were highest when the bottom water had stabilized to a low-oxygen state, in contrast with the notion that stable anoxia is particularly conducive to complete denitrification without accumulation of N 2 O. This study provides evidence that lake sediments are a significant source of N 2 O to the overlying water and may produce large N 2 O fluxes to the atmosphere during seasonal mixing events.

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“…The benthic lander contains two stainless steel flux chambers that cover sediment areas of 400 cm 2 and enclose about 3-6 l of water (Tengberg et al, 1995;Mengis et al, 1996). The device was lowered to the bottom, tethered to a free-floating buoy, and was retrieved after 24 hr.…”

Section: Flux Chamber Deploymentsmentioning

confidence: 99%

Benthic Nutrient Cycling and Diagenetic Pathways in the North-western Black Sea

Friedrich

Dinkel

Friedl

et al. 2002

Estuarine, Coastal and Shelf Science

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Benthic fluxes of nutrients and metals were measured in the coastal zone of the north-western Black Sea, which is influenced by the Danube and Dniestr rivers. The results from the benthic flux chambers deployed during two EROS 21 cruises in summer 1995 and in spring 1997 yield information on benthic nutrient cycling and diagenetic pathways at the sediment-water interface. This information is discussed in the light of benthic activity as well as pore-water data. The benthic recycling of nutrients varied seasonally due to the availability of oxygen and organic material, and spatially due to river influence. Areas of high benthic fluxes near-shore and of low benthic fluxes offshore on the shelf were distinguished. Nutrients and suspended particulate matter discharged by the Danube is kept nearshore by the coastal current. The oxygen concentrations in the bottom water varied strongly between the two seasons. In summer, the bottom water at the near-shore stations turned anoxic. In spring, the higher oxygen concentrations are related to more intense mixing of the water column due to stormy periods and high river discharge. Highest oxygen concentrations were found on the offshore continental shelf. However, the benthic oxygen consumption rates in spring (13-23 mmol m 2 day 1 ) were as high as in summer. Areas with highest nutrient concentrations in the overlaying bottom water were found at the Danube delta front and Danube prodelta. On the Danube delta front and the Dniestr mouth, ammonia fluxes were lower in spring (1·1-1·7 mmol m 2 day 1 ) than in the summer (2·6-4·4 mmol m 2 day 1 ) due to higher nitrification rates and the lower influx of organic matter. In spring, the concentrations of dissolved iron and manganese in the bottom water were one order of magnitude lower than during the summer. This decrease in flux rates is related to the higher oxygen concentrations in the bottom water in spring. A rough comparison of the river's nutrient load and the benthic recycling over a certain area showed that the near-shore benthic phosphate and silica recycling account for 50% and 35% of the Danube input in summer, respectively. The fluxes of ammonia from benthic recycling and from the Danube discharge were at the same order of magnitude in both seasons. Nitrogen is introduced by the rivers mostly as nitrate. Benthic recycling is the dominant source of ammonia. The Danube input is phosphate deficient. In brief, benthic nutrient recycling is an important factor in sustaining high productivity of the system.

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Nitrous oxide emissions to the atmosphere from an artificially oxygenated lake

Cited by 35 publications

References 5 publications

Greenhouse gas emissions (CO2, CH4, and N2O) from several perialpine and alpine hydropower reservoirs by diffusion and loss in turbines

Greenhouse gas emissions (CO2, CH4, and N2O) from several perialpine and alpine hydropower reservoirs by diffusion and loss in turbines

Year-round N<sub>2</sub>O production by benthic NO<sub>x</sub> reduction in a monomictic south-alpine lake

Benthic Nutrient Cycling and Diagenetic Pathways in the North-western Black Sea

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Nitrous oxide emissions to the atmosphere from an artificially oxygenated lake

Cited by 35 publications

References 5 publications

Greenhouse gas emissions (CO2, CH4, and N2O) from several perialpine and alpine hydropower reservoirs by diffusion and loss in turbines

Greenhouse gas emissions (CO2, CH4, and N2O) from several perialpine and alpine hydropower reservoirs by diffusion and loss in turbines

Year-round N&lt;sub&gt;2&lt;/sub&gt;O production by benthic NO&lt;sub&gt;x&lt;/sub&gt; reduction in a monomictic south-alpine lake

Benthic Nutrient Cycling and Diagenetic Pathways in the North-western Black Sea

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Year-round N<sub>2</sub>O production by benthic NO<sub>x</sub> reduction in a monomictic south-alpine lake