Time series analysis of monthly mean data of temperature, salinity, nutrients, suspended matter, phyto- and zooplankton at eight locations on the northwest european shelf

Visser, M.; Batten, Sonia D.; Becker, G.; Bot, P.; Colijn, F.; Damm, Peter; Danielssen, Didrik S.; Eynde, D. Van den; Føyn, Lars; Frohse, Alexander; Groeneveld, G.; Laane, R.W.P.M.; Raaphorst, Wim van; Radach, Günther; Schultz, H.; Sündermann, Jürgen

doi:10.1007/bf02799376

Cited by 27 publications

(17 citation statements)

References 16 publications

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“…The long-term trends of the nutrient loads of the continental rivers and their effects on the coastal waters have been recognized and discussed in many papers (Radach 1992;Sü ndermann et al 1996;Visser et al 1996;Grimvall et al 2000;Van Beusekom et al 2005). The periodicity of 6-7 yr that is superimposed on the long-term trends, was not noticed so far, at least to our knowledge.…”

Section: Riverine Inputs In Relation To Other Budget Contributions Tomentioning

confidence: 99%

“…The periodicity of 6-7 yr that is superimposed on the long-term trends, was not noticed so far, at least to our knowledge. This may be due to the fact that often the time series were averaged by running means over 3-5 yr Visser et al 1996). Visser et al (1996) performed spectral analyses of the several time series of observations in the waters of the continental coast of the North Sea.…”

Section: Riverine Inputs In Relation To Other Budget Contributions Tomentioning

confidence: 99%

“…This may be due to the fact that often the time series were averaged by running means over 3-5 yr Visser et al 1996). Visser et al (1996) performed spectral analyses of the several time series of observations in the waters of the continental coast of the North Sea. They obtained significant periods only in the time series from Helgoland Roads in the range of 6-7 yr for salinity (6.6 yr), chlorophyll (6.2 yr), nitrate (7.4 yr), and silicate (6.8 yr).…”

Section: Riverine Inputs In Relation To Other Budget Contributions Tomentioning

confidence: 99%

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Variability of continental riverine freshwater and nutrient inputs into the North Sea for the years 1977–2000 and its consequences for the assessment of eutrophication

Radach¹,

Pätsch²

2007

Estuaries and Coasts

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We determined the monthly and annual riverine freshwater, nitrogen (N) and phosphorus (P) loading into the North Sea from Belgium, The Netherlands, and Germany for the years 1977-2000. An average of 133 km 3 yr 21 of the 309 km 3 yr 21 precipitation into the watershed is carried by the rivers into the sea. Total freshwater discharge fluctuates with a strong 6-7 yr periodicity, is strongly correlated with precipitation, and exhibits a slight long-term decrease. The temporal changes of regional patterns of precipitation lead to changing ratios of annual discharge of the western rivers compared to the eastern rivers, varying between 2.2 and 3.5. The long-term oscillations in discharge were more pronounced as discharge increased. The annual means of total and dissolved inorganic N and P loads were estimated to be 722 and 582 kt N yr 21 and 48 and 26 kt P yr 21 , respectively. The monthly N loads were much more strongly correlated with discharge, compared to the monthly P loads. Total N and P as well as dissolved inorganic N also demonstrated a 6-7 yr periodicity. The annual N loads decreased by about 17 kt N yr 21 from 1977 to 2000. The total phosphorus and phosphate loads decreased from about 80 and 50 kt P yr 21 in the 1980s to 25 and 12 kt P yr 21 , respectively, in the 1990s. The western rivers contributed the major part of the nutrient loads. The long-term oscillations in their nutrient loads were much more pronounced, compared to the eastern rivers. The area-specific loading rates estimated for all rivers are comparable to earlier estimates using shorter data records, smaller sample sizes, and a less complete watershed monitoring program. The monthly and annual average N:P ratios and their variability increased considerably for individual rivers during the study interval. These results confirm that the water quality of European continental rivers is strongly influenced by intense land use. They demonstrate the necessity for using long time series monitoring results to assess change and evaluate the effects of climate change on the North Sea coastal ecosystems, using ecosystem models on decadal time scales.

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Section: Riverine Inputs In Relation To Other Budget Contributions Tomentioning

confidence: 99%

Section: Riverine Inputs In Relation To Other Budget Contributions Tomentioning

confidence: 99%

Section: Riverine Inputs In Relation To Other Budget Contributions Tomentioning

confidence: 99%

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Variability of continental riverine freshwater and nutrient inputs into the North Sea for the years 1977–2000 and its consequences for the assessment of eutrophication

Radach¹,

Pätsch²

2007

Estuaries and Coasts

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“…Time series are often analysed for hindcast of events and trends in the past (Visser et al, 1996;Gräwe and Burchard, 2012). Due to the long-term aspect of these measurements data sets are often affected by sensor degradation and maintenance resulting in time series combining periods of highand low-quality of data.…”

Section: Introductionmentioning

confidence: 99%

Processing of water level derived from water pressure data at the Time Series Station Spiekeroog

Holinde

Badewien

Freund

et al. 2015

Earth Syst. Sci. Data

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Abstract. The quality of water level time series data strongly varies with periods of high-and low-quality sensor data. In this paper we are presenting the processing steps which were used to generate high-quality water level data from water pressure measured at the Time Series Station (TSS) Spiekeroog. The TSS is positioned in a tidal inlet between the islands of Spiekeroog and Langeoog in the East Frisian Wadden Sea (southern North Sea). The processing steps will cover sensor drift, outlier identification, interpolation of data gaps and quality control. A central step is the removal of outliers. For this process an absolute threshold of 0.25 m 10 min −1 was selected which still keeps the water level increase and decrease during extreme events as shown during the quality control process. A second important feature of data processing is the interpolation of gappy data which is accomplished with a high certainty of generating trustworthy data. Applying these methods a 10-year data set (December 2002-December 2012) of water level information at the TSS was processed resulting in a 7-year time series (2005)(2006)(2007)(2008)(2009)(2010)(2011). Supplementary data are available at

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“…These time series were then split in a long-term trend, a seasonal cycle and a residue, following methods proposed in the NOWESP project (Visser et al, 1996). The long-term trend was calculated on the basis of a moving average filter with a period of 48 months.…”

Section: Introduction and Average Valuesmentioning

confidence: 99%

Evolution of marine storminess in the Belgian part of the North Sea

Eynde

Sutter

Haerens

2012

Nat. Hazards Earth Syst. Sci.

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Abstract.Severe storms have affected European coast lines in the past but knowledge on changes in storminess for the last decades is still sparse. Climate change is assumed to be a main driving factor with the potential to induce changes on the intensity, duration and frequency of powerful marine storms, including a long-term influence on peak wind speeds, surges and waves. It is, therefore, important to investigate whether in the last decades changes in the magnitude of storms, their duration and frequency could be observed. Understanding trends in storminess in the last decades will help to better prepare coastal managers for future events, taking into account potential changes on storm occurrence and magnitude to improve planning of mitigation and adaptation strategies. The purpose of this study was to focus on the evolution of extreme wind conditions, wave height and storm surge levels in the North Sea Region, especially in the Belgian part of the North Sea (BPNS). Based on the analysis performed it is concluded that no clear trend can be observed for the occurrence of significant increasing extreme wind speeds over the BPNS. Furthermore, one can conclude that not enough scientific evidence is available to support scenarios with increased wave height or storminess.

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Time series analysis of monthly mean data of temperature, salinity, nutrients, suspended matter, phyto- and zooplankton at eight locations on the northwest european shelf

Cited by 27 publications

References 16 publications

Variability of continental riverine freshwater and nutrient inputs into the North Sea for the years 1977–2000 and its consequences for the assessment of eutrophication

Variability of continental riverine freshwater and nutrient inputs into the North Sea for the years 1977–2000 and its consequences for the assessment of eutrophication

Processing of water level derived from water pressure data at the Time Series Station Spiekeroog

Evolution of marine storminess in the Belgian part of the North Sea

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