Structure and energy demand of the benthic community of the oyster ground, central North Sea

Wilde, Peter; Berghuis, E.M.; Kok, A.

doi:10.1016/0077-7579(84)90029-2

Cited by 63 publications

(20 citation statements)

References 8 publications

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“…The simulated organic matter mineralization rate in the sediment is ∼ 48 g C m −2 yr −1 . This estimate lies well within the previous reported range for the Oyster Grounds of 41 to 46 g C m −2 yr −1 (De Wilde et al, 1984) but is again lower than the high mineralization value of 131 g C m −2 yr −1 reported by Osinga et al (1996).…”

Section: Present Situation In the Oyster Groundssupporting

confidence: 90%

Impact of global change on coastal oxygen dynamics and risk of hypoxia

2013

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Climate change and changing nutrient loadings are the two main aspects of global change that are linked to the increase in the prevalence of coastal hypoxia – the depletion of oxygen in the bottom waters of coastal areas. However, it remains uncertain how strongly these two drivers will each increase the risk of hypoxia over the next decades. Through model simulations we have investigated the relative influence of climate change and nutrient run-off on the bottom water oxygen dynamics in the Oyster Grounds, an area in the central North Sea experiencing summer stratification. Simulations were performed with a one-dimensional ecosystem model that couples hydrodynamics, pelagic biogeochemistry and sediment diagenesis. Climatological conditions for the North Sea over the next 100 yr were derived from a global-scale climate model. Our results indicate that changing climatological conditions will increase the risk of hypoxia. The bottom water oxygen concentration in late summer is predicted to decrease by 24 μM or 11.5% in the year 2100. More intense stratification is the dominant factor responsible for this decrease (58%), followed by the reduced solubility of oxygen at higher water temperature (27%), while the remaining part could be attributed to enhanced metabolic rates in warmer bottom waters (15%). Relative to these climate change effects, changes in nutrient runoff are also important and may even have a stronger impact on the bottom water oxygenation. Decreased nutrient loadings strongly decrease the probability of hypoxic events. This stresses the importance of continued eutrophication management in coastal areas, which could function as a mitigation tool to counteract the effects of rising temperatures

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Section: Present Situation In the Oyster Groundssupporting

confidence: 90%

Impact of global change on coastal oxygen dynamics and risk of hypoxia

2013

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“…The same applies to the Oyster Grounds site (see Figure 5, region 2) where simulated minimum near-bottom concentrations yield 6-6.5 mg O 2 L −1 . As the Oyster Grounds are well known being susceptible to low O 2 conditions (de Wilde et al, 1984;Peeters et al, 1995;Weston et al, 2008;Greenwood et al, 2010), this region is also used for a detailed analysis. At this site, the comparison with Figure 4 indicates a strong influence of the NL-1 and UK-2 rivers, and the NA (not shown).…”

Section: Spatial Distributions Of Tn From Different Sourcesmentioning

confidence: 99%

A Novel Modeling Approach to Quantify the Influence of Nitrogen Inputs on the Oxygen Dynamics of the North Sea

et al. 2017

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Oxygen (O 2 ) deficiency, i.e., dissolved O 2 concentrations below 6 mg O 2 L −1 , is a common feature in the southern North Sea. Its evolution is governed mainly by the presence of seasonal stratification and production of organic matter, which is subsequently degraded under O 2 consumption. The latter is strongly influenced by riverine nutrient loads, i.e., nitrogen (N) and phosphorus (P). As riverine P loads have been reduced significantly over the past decades, this study aims for the quantification of the influence of riverine and non-riverine N inputs on the O 2 dynamics in the southern North Sea. For this purpose, we present an approach to expand a nutrient-tagging technique for physical-biogeochemical models -often referred to as 'trans-boundary nutrient transports' (TBNT) -by introducing a direct link to the O 2 dynamics. We apply the expanded TBNT to the physical-biogeochemical model system HAMSOM-ECOHAM and focus our analysis on N-related O 2 consumption in the southern North Sea during 2000-2014. The analysis reveals that near-bottom O 2 consumption in the southern North Sea is strongly influenced by the N supply from the North Atlantic across the northern shelf edge. However, riverine N sources -especially the Dutch, German and British rivers -as well as the atmosphere also play an important role. In the region with lowest simulated O 2 concentrations (around 56 • N, 6.5 • E), riverine N on average contributes 39% to overall near-bottom O 2 consumption during seasonal stratification. Here, the German and the large Dutch rivers constitute the highest riverine contributions (11% and 10%, respectively). At a site in the Oyster Grounds (around 54.5 • N, 4 • E), the average riverine contribution adds up to 41%, even exceeding that of the North Atlantic. Here, highest riverine contributions can be attributed to the Dutch and British rivers adding up to almost 28% on average. The atmospheric contribution results in 13%. Our results emphasize the importance of anthropogenic N inputs and seasonal stratification for the O 2 conditions in the southern North Sea. They further suggest that reductions in the riverine and atmospheric N inputs may have a relevant positive effect on the O 2 levels in this region.

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“…Earlier studies have shown the potential for low oxygen events in the central North Sea (Postma and Rommets, 1984;Peeters et al, 1995;Boers, 2005;Weston et al, 2008;De Wilde et al, 1984) but seasonal and temporal coverage was limited. The North Sea, being surrounded by the industrialised nations of northern Europe including the United Kingdom, The Netherlands, Belgium, Denmark and Germany, receives significant anthropogenic nutrient riverine input with the Rhine, for example, resulting in dissolved inorganic nitrogen inputs of ∼300 ktonnes y −1 (De Jonge et al, 1996).…”

Section: Introductionmentioning

confidence: 99%

Detection of low bottom water oxygen concentrations in the North Sea; implications for monitoring and assessment of ecosystem health

et al. 2010

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Abstract. This paper presents new results from high temporal resolution observations over two years (2007 and 2008) from instrumented moorings deployed in the central North Sea, at the Oyster Grounds and on the northern slope of Dogger Bank (North Dogger). The water column was stratified in the summer at both sites, leading to limited exchange of the water in the bottom mixed layer. Data from these moorings revealed the variable nature of summer oxygen depletion at the Oyster Grounds. The combination of in situ and ship-based measurements allowed the physical and biological conditions leading to decreasing dissolved oxygen concentrations in bottom water to be examined. In 2007 and 2008, the concentration of dissolved oxygen in the bottom water at both sites was observed to decrease throughout the summer period after the onset of stratification. Depleted dissolved oxygen concentration (6.5 mg l −1 , 71% saturation) was measured at the North Dogger, a site which is not significantly influenced by anthropogenic nutrient inputs. Lower oxygen saturation (5.2 mg l −1 , 60% saturation) was measured for short durations at the Oyster Grounds. The seasonal increase in bottom water temperature accounted for 55% of the decrease in dissolved oxygen concentration at the Oyster Grounds compared to 10% at North Dogger.Dissolved oxygen concentration in bottom water at the Oyster Grounds was shown to be strongly influenced by short term events including storms and pulses of particulate organic matter input. In contrast, dissolved oxygen concentration in bottom water at the North Dogger reflected longer seaCorrespondence to: N. Greenwood (naomi.greenwood@cefas.co.uk) sonal processes such as a gradual temperature increase over the summer and a more steady supply of particulate organic matter to the bottom mixed layer. The differences between the study sites shows the need for an improved understanding of the mechanisms driving these processes if the use of oxygen in marine management and ensuring ecosystem health is to be meaningful and successful in the future. These high frequency observations provide greater understanding of the nature of the depletion in bottom oxygen concentration in the North Sea.

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Structure and energy demand of the benthic community of the oyster ground, central North Sea

Cited by 63 publications

References 8 publications

Impact of global change on coastal oxygen dynamics and risk of hypoxia

Impact of global change on coastal oxygen dynamics and risk of hypoxia

A Novel Modeling Approach to Quantify the Influence of Nitrogen Inputs on the Oxygen Dynamics of the North Sea

Detection of low bottom water oxygen concentrations in the North Sea; implications for monitoring and assessment of ecosystem health

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