Nitrogen cycling in North Sea sediments: interaction of denitrification and nitrification in offshore and coastal areas

Lohse, L.; Malschaert, Jfp; Slomp, CP; Helder, W.; Raaphorst, Wim van

doi:10.3354/meps101283

Cited by 103 publications

(65 citation statements)

References 30 publications

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“…This way, we obtain a denitrification rate of 1.94 mmol N m −2 d −1 or 2.43 mmol C m −2 d −1 , with an associated A T release of 2.29 mmol m −2 d −1 . In the North Sea, a tight coupling of nitrification and denitrification has indeed been reported by Lohse et al (1993) and Pätsch and Kühn (2008), and observed benthic denitrification rates in the SNS range from 1.6 to 4.6 mmol C m −2 d −1 (Lohse et al, 1996;Hydes et al, 1999), a range that centrally embraces our estimate here. Note that the coupling of ammonification, nitrification and subsequently denitrification does not lead to net production of A T .…”

Section: Input Parameter Expressionsupporting

confidence: 47%

The impact of sedimentary alkalinity release on the water column CO<sub>2</sub> system in the North Sea

et al. 2016

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Abstract. It has been previously proposed that alkalinity release from sediments can play an important role in the carbonate dynamics on continental shelves, lowering the pCO 2 of seawater and hence increasing the CO 2 uptake from the atmosphere. To test this hypothesis, sedimentary alkalinity generation was quantified within cohesive and permeable sediments across the North Sea during two cruises in September 2011 (basin-wide) and June 2012 (Dutch coastal zone). Benthic fluxes of oxygen (O 2 ), alkalinity (A T ) and dissolved inorganic carbon (DIC) were determined using shipboard closed sediment incubations. Our results show that sediments can form an important source of alkalinity for the overlying water, particularly in the shallow southern North Sea, where high A T and DIC fluxes were recorded in nearshore sediments of the Belgian, Dutch and German coastal zone. In contrast, fluxes of A T and DIC are substantially lower in the deeper, seasonally stratified, northern part of the North Sea. Based on the data collected, we performed a model analysis to constrain the main pathways of alkalinity generation in the sediment, and to quantify how sedimentary alkalinity drives atmospheric CO 2 uptake in the southern North Sea. Overall, our results show that sedimentary alkalinity generation should be regarded as a key component in the CO 2 dynamics of shallow coastal systems.

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Section: Input Parameter Expressionsupporting

confidence: 47%

The impact of sedimentary alkalinity release on the water column CO<sub>2</sub> system in the North Sea

et al. 2016

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“…In the case of nitrogen, sediments are a source as well as a major sink in the cycling of this element regulating its concentration and thus, the productivity of coastal marine systems (Lohse et al, 1993). Phosphorus is an essential nutrient for the growth of marine phytoplankton and has been suggested as the limiting factor for ocean primary production (Howarth et al, 1995).…”

Section: Introductionmentioning

confidence: 99%

Biogeochemical processes and nutrient cycling within an artificial reef off Southern Portugal

Falcão

Santos

Vicente

et al. 2007

Marine Environmental Research

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“…(Lohse et al 1993;Bateman and Baggs 2005). These varies processes and conditions demonstrate the complexity of processes and environmental factors affecting N 2 O emissions.…”

Section: Anthropogenic Activity Has Drastically Altered the Global Nimentioning

confidence: 99%

Nitrous oxide fluxes and dissolved N gases (N2 and N2O) within riparian zones along the agriculturally impacted San Joaquin River

Hinshaw

Dahlgren

2016

Nutr Cycl Agroecosyst

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TitleNitrous oxide fluxes and dissolved N gases (N2 and N2O) within riparian zones along the agriculturally impacted San Joaquin River ? and NO 3 -, while benthic N 2 O fluxes were regulated by variations in dissolved oxygen and river flow. Higher fluxes in the riparian soils in 2011 were attributed to several months of flooding that significantly impacted groundwater tables and nutrient availability. Dissolved N 2 O from groundwater within the riparian zones was not found to be a significant factor contributing to atmospheric fluxes. These results suggest that riparian zones within the agriculturally impacted San Joaquin River were a significant source of N 2 O when elevated NO 3 -was present. Different controlling factors for fluxes within benthic sediments suggested that riparian vegetation did not play a role in NO 3 -concentrations or fluxes within the surface water.

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Nitrogen cycling in North Sea sediments: interaction of denitrification and nitrification in offshore and coastal areas

Cited by 103 publications

References 30 publications

The impact of sedimentary alkalinity release on the water column CO<sub>2</sub> system in the North Sea

The impact of sedimentary alkalinity release on the water column CO<sub>2</sub> system in the North Sea

Biogeochemical processes and nutrient cycling within an artificial reef off Southern Portugal

Nitrous oxide fluxes and dissolved N gases (N2 and N2O) within riparian zones along the agriculturally impacted San Joaquin River

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Nitrogen cycling in North Sea sediments: interaction of denitrification and nitrification in offshore and coastal areas

Cited by 103 publications

References 30 publications

The impact of sedimentary alkalinity release on the water column CO&lt;sub&gt;2&lt;/sub&gt; system in the North Sea

The impact of sedimentary alkalinity release on the water column CO&lt;sub&gt;2&lt;/sub&gt; system in the North Sea

Biogeochemical processes and nutrient cycling within an artificial reef off Southern Portugal

Nitrous oxide fluxes and dissolved N gases (N2 and N2O) within riparian zones along the agriculturally impacted San Joaquin River

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The impact of sedimentary alkalinity release on the water column CO<sub>2</sub> system in the North Sea

The impact of sedimentary alkalinity release on the water column CO<sub>2</sub> system in the North Sea