scholarly journals Seasonal cycling of phosphorus in the Southern Bight of the North Sea

2005 ◽  
Vol 2 (1) ◽  
pp. 27-42 ◽  
Author(s):  
C. van der Zee ◽  
L. Chou
Keyword(s):  
North Sea ◽  
Organic Phosphorus ◽  
Salinity Gradient ◽  
Temporal Trends ◽  
Elemental Ratios ◽  
Southern Bight ◽  
The North ◽  
Limiting Nutrient ◽  
Spatial And Temporal Trends ◽  
Inorganic And Organic

Abstract. We have investigated the seasonal cycle of nutrients, chlorophyll a, dissolved organic nitrogen (DON), and dissolved and particulate organic carbon (DOC and POC) for 10 stations in the Belgian coastal zone. Special attention was given to phosphorus speciation, i.e. dissolved inorganic and organic phosphorus (DIP and DOP) and particulate inorganic and organic phosphorus (PIP and POP). Spatial and temporal trends of the inorganic nutrients and the organic species are discussed. The Belgian part of the southern North Sea is strongly influenced by the river plumes of the Rhine, Meuse and Scheldt resulting in northeast-southwest salinity gradient. Extrapolation of winter nutrient and DOC concentrations versus salinity plots yielded zero-salinity values typical of the river Scheldt. The polyphosphate concentration did not show any temporal trend, whereas both the phosphate and the DOP concentrations exhibited distinct seasonal variations. Silica or phosphorus was the potential limiting nutrient for phytoplankton growth based on elemental ratios.

scholarly journals Seasonal cycling of phosphorus in the southern bight of the North Sea

2004 ◽  
Vol 1 (1) ◽  
pp. 681-707 ◽  
Author(s):  
C. van der Zee ◽  
L. Chou
Keyword(s):  
North Sea ◽  
Seasonal Cycle ◽  
Organic Phosphorus ◽  
Phosphorus Limitation ◽  
Nutrient Concentrations ◽  
Southern Bight ◽  
The North ◽  
Phosphorus Recycling ◽  
Two Peaks ◽  
Inorganic And Organic

Abstract. We have investigated the seasonal cycle of nutrients and the phosphorus speciation, i.e. dissolved inorganic and organic phosphorus (DIP and DOP) and particulate inorganic and organic phosphorus (PIP and POP), for 10 stations in the Belgian coastal zone. The Belgian part of the southern North Sea is strongly influenced by the river plumes of the Rhine, Meuse and Scheldt. In winter, high nutrient concentrations are observed, whereas in April-May these have all been consumed during the spring bloom and silica or phosphorus limitation develops. The phosphate concentrations increase rapidly again in summer-fall, whereas nitrate and silicate return to their winter values much later. This shows the efficient phosphorus recycling that takes place in the water column. The DOP concentration exhibits two peaks during a seasonal cycle: one in April-May when the phosphate concentration is at its lowest and a second one in fall when the POP content decreases. This indicates two periods of increased phosphorus recycling activity. The seasonal cycle of the DOP is different from that of dissolved organic nitrogen (DON).

Spatial and temporal trends in nutrient concentrations in the Belgian Continental area of the North Sea during the period 1993–2000

2004 ◽  
Vol 61 (3) ◽  
pp. 517-528 ◽  
Author(s):  
Sandra De Galan ◽  
Marc Elskens ◽  
Leo Goeyens ◽  
André Pollentier ◽  
Natacha Brion ◽  
...  
Keyword(s):  
North Sea ◽  
Temporal Trends ◽  
Nutrient Concentrations ◽  
The North ◽  
The North Sea ◽  
Continental Area ◽  
Spatial And Temporal Trends

Dynamic patterns of dissolved nitrogen in the Southern Bight of the North Sea

1984 ◽  
Vol 18 (5) ◽  
pp. 499-510 ◽  
Author(s):  
Willy Baeyens ◽  
Jean-Paul Mommaerts ◽  
Leo Goeyens ◽  
Frank Dehairs ◽  
Hugues Dedeurwaerder ◽  
...  
Keyword(s):  
North Sea ◽  
Southern Bight ◽  
Dissolved Nitrogen ◽  
The North ◽  
The North Sea ◽  
Dynamic Patterns

Fluxes and Sources of Heavy Metal Inputs into the Southern Bight of the North Sea

1992 ◽  
pp. 185-193
Author(s):  
R. Van Grieken ◽  
J. Injuk ◽  
P. Otten ◽  
C. Rojas ◽  
H. Van Malderen ◽  
...  
Keyword(s):  
Heavy Metal ◽  
North Sea ◽  
Southern Bight ◽  
The North ◽  
The North Sea

scholarly journals Spatiotemporal modelling of pregabalin prescribing in England with effect of deprivation

BMJ Open ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. e029624
Author(s):  
Ziyu Zheng ◽  
Benjamin Taylor ◽  
Barry Rowlingson ◽  
Euan Lawson
Keyword(s):  
Positive Impact ◽  
Temporal Trends ◽  
Geographical Location ◽  
Additive Models ◽  
The South ◽  
The North ◽  
Prescribing Trends ◽  
Prescription Rates ◽  
General Practices ◽  
Spatial And Temporal Trends

ObjectiveThis paper aims to understand spatial and temporal trends in pregabalin prescribing and the relationship with deprivation across England at both general practice and clinical commissioning group (CCG) levels.DesignA set of 207 independent generalised additive models are employed to model the spatiotemporal trend of pregabalin prescribed and dispensed per 1000 population, adjusting for deprivation. The response variable is pregabalin prescribed in milligrams, with weighted Index of Multiple Deprivation (IMD), geographical location and time as predictors. The set of active prescribing facilities grouped within CCG is the unit of analysis.SettingNational Health Service open prescribing data; all general practices in England, UK between January 2015 and June 2017.PopulationAll patients registered to general practices in England, UK.ResultsAdjusting for deprivation, a North–South divide is shown in terms of prescribing trends, with the North of England showing increasing prescribing rates during the study period on average, while in the South of England rates are on average decreasing. Approximately 60% of general practices showed increasing prescribing rate, with the highest being 4.03 (1.75 for the most decreasing). There were no apparent spatial patterns in baseline prescription rates at the CCG level. Weighted IMD score proved to be statistically significant in 138 of 207 CCGs. Two-thirds of CCGs showed more pregabalin prescribed in areas of greater deprivation. Whether the prescribing rate is high due to high baseline prescription rate or increasing rates needs to be specifically looked at.ConclusionsThe spatial temporal modelling demonstrated that the North of England has a significantly higher chance to see increase in pregablin prescriptions compared with the South, adjusted for weighted IMD. Weighted IMD has shown positive impact on pregabalin prescriptions for 138 CCGs.

scholarly journals Spatially resolved past and projected changes of the suitable thermal habitat of North Sea cod (Gadus morhua) under climate change

2019 ◽  
Vol 76 (7) ◽  
pp. 2389-2403
Author(s):  
Ismael Núñez-Riboni ◽  
Marc H Taylor ◽  
Alexander Kempf ◽  
Miriam Püts ◽  
Moritz Mathis
Keyword(s):  
Climate Change ◽  
North Sea ◽  
Gadus Morhua ◽  
Climate Model ◽  
Regional Climate ◽  
Change Scenario ◽  
Intergovernmental Panel ◽  
Southern Bight ◽  
Spatially Resolved ◽  
The North

Abstract Previous studies have identified changes in habitat temperature as a major factor leading to the geographical displacement of North Sea cod in the last decades. However, the degree to which thermal suitability is presently changing in different regions of the North Sea is still unclear, or if temperature alone (or together with fishery) is responsible for this displacement. In this study, the spatial distribution of different life stages of cod was modelled from 1967 to 2015. The model is fit point-to-point, spatially resolved at scales of 20 km. The results show that suitability has decreased south of 56°N (>12% in the Southern Bight) and increased north of it (with maximum of roughly 10% in southern Skagerrak). Future changes to suitability were estimated throughout the century using temperature projections from a regional climate model under the Intergovernmental Panel on Climate Change scenario RCP8.5. The results show that southern Skagerrak, the central and northern North Sea and the edge of the Norwegian trench will remain thermally suitable for North Sea cod throughout the century. This detailed geographical representation of thermally suitable key zones for North Sea cod under climate change is revealed for the first time through the improved resolution of this analysis.

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