On the dynamics of the large-scale circulation of the skagerrak

Rodhe, Johan

doi:10.1016/s1385-1101(96)90731-5

Cited by 85 publications

(59 citation statements)

References 15 publications

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“…Validation 3.1.1. Volume Transports Table 2 presents volume transports across defined sections simulated by HAMSOM and corresponding transports from other modeling studies (Ozer, 2011;Winther and Johannessen, 2006) and observations (Winther and Johannessen, 2006) Winther and Johannessen (2006) and originate from Otto et al (1990), Rodhe (1996), Rydberg et al (1996), and Danielssen et al (1997). Otto et al (1990), Rodhe (1996), Rydberg et al (1996), and Danielssen et al (1997).…”

Section: Resultsmentioning

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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Section: Resultsmentioning

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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“…The deepwater circulation is dominated by water of Atlantic origin (AW) which enters the Skagerrak through the deep Norwegian Trench, whlle intrusion of shelf water from the North Sea (NSSW) is observed off the Danish coast. Rodhe (1996) and Gustafsson & Stigebrandt (1996) provide more detailed information about water masses and currents in the investigation area.…”

Section: Methodsmentioning

confidence: 99%

Variability in frontal zone formation and distribution of gadoid fish larvae at the shelf break in the northeastern North Sea

Munk¹,

Larsson²,

Danielssen³

et al. 1999

Mar. Ecol. Prog. Ser.

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Hydrography and larval fish distribution in the northeastern North Sea were studied during a research programme carried out during the period from 1991 to 1994. The aim was to examine the connection between frontal zone formation and nursery characteristics of gadoid larvae at the shelf break. Emphasis was placed on the year-to-year variation in frontal characteristics and distributional patterns of larvae An area of about 67000 km2 covering the northeastern North Sea, the Skagerrak and the Kattegat was surveyed by grid or transect sampling. At each sampling station the hydrography was studied by CTD casts, and the abundance of fish larvae was measured by depth integrating tows of a 2 m ring net. Five species of gadoid larvae and small luveniles were found in the area. cod Gadus rnorhua, whiting Merlangjus merlangus, haddock Melanogrammus aeglefinus, Norway pout Trisopterus esmarki and saithe Pollachius virens. Larval abundance differed markedly between species and years. The abundance of all species was the highest in 1992 and declined during the follo~ving 2 years. In 1994, cod and whiting were the only gadoid species observed. Peak abundance of all gadoids was found in the vicinity of the frontal zone; however, the relationship between larval distribution and hydrography differed among species. Correspondence between spatial and interannual variation in characteristics of frontal zones and larval distributions suggests that frontal zone variability is a central element in the early hfe of gadoid larvae from the area.

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“…The average depth of the Skagerrak is about 210 m. The Skagerrak is strongly stratified in summer, but also features a weak stratification in winter driven by Baltic freshwater inputs (Gustafsson and Stigebrandt, 1996;Rodhe, 1987). The Skagerrak is connected to the Norwegian Sea through the Norwegian Trench, with a sill depth of 270 m. The Norwegian Trench itself is a deep sedimentary basin (250-700 m) that reaches from the Oslofjord in the southeast to the Stad Peninsula in the upper northwest (Rodhe, 1996). Like the Skagerrak, the Norwegian Trench is characterized by haline stratified water masses (Reid and Edwards, 2001).…”

Section: North Sea Systemmentioning

confidence: 99%

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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On the dynamics of the large-scale circulation of the skagerrak

Cited by 85 publications

References 15 publications

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

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

Variability in frontal zone formation and distribution of gadoid fish larvae at the shelf break in the northeastern North Sea

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

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On the dynamics of the large-scale circulation of the skagerrak

Cited by 85 publications

References 15 publications

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

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

Variability in frontal zone formation and distribution of gadoid fish larvae at the shelf break in the northeastern 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

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