scholarly journals Review of Wilson & Heath „Increasing turbidity in the North Sea during the 20th century due to changing wave climate “

2019 ◽  
Author(s):  
Jochen Wollschlaeger
Keyword(s):  
20Th Century ◽  
North Sea ◽  
Wave Climate ◽  
The North ◽  
The North Sea

scholarly journals Increasing turbidity in the North Sea during the 20th century due to changing wave climate

Ocean Science ◽  
2019 ◽  
Vol 15 (6) ◽  
pp. 1615-1625 ◽  
Author(s):  
Robert J. Wilson ◽  
Michael R. Heath
Keyword(s):  
Shear Stress ◽  
20Th Century ◽  
North Sea ◽  
Water Clarity ◽  
Wave Climate ◽  
Current Data ◽  
Bed Shear Stress ◽  
Secchi Disc ◽  
The North ◽  
The North Sea

Abstract. Data on Secchi disc depth (the depth at which a standard white disc lowered into the water just becomes invisible to a surface observer) show that water clarity in the North Sea declined during the 20th century, with likely consequences for marine primary production. However, the causes of this trend remain unknown. Here we analyse the hypothesis that changes in the North Sea's wave climate were largely responsible by causing an increase in the concentrations of suspended particulate matter (SPM) in the water column through the resuspension of seabed sediments. First, we analysed the broad-scale statistical relationships between SPM and bed shear stress due to waves and tides. We used hindcasts of wave and current data to construct a space–time dataset of bed shear stress between 1997 and 2017 across the northwest European Continental Shelf and compared the results with satellite-derived SPM concentrations. Bed shear stress was found to drive most of the inter-annual variation in SPM in the hydrographically mixed waters of the central and southern North Sea. We then used a long-term wave reanalysis to construct a time series of bed shear stress from 1900 to 2010. This shows that bed shear stress increased significantly across much of the shelf during this period, with increases of over 20 % in the southeastern North Sea. An increase in bed shear stress of this magnitude would have resulted in a large reduction in water clarity. Wave-driven processes are rarely included in projections of climate change impacts on marine ecosystems, but our analysis indicates that this should be reconsidered for shelf sea regions.

Spectral wave climate of the North Sea

2007 ◽  
Vol 29 (3) ◽  
pp. 146-154 ◽  
Author(s):  
Alexander V. Boukhanovsky ◽  
Leonid J. Lopatoukhin ◽  
C. Guedes Soares
Keyword(s):  
North Sea ◽  
Wave Climate ◽  
The North ◽  
The North Sea

scholarly journals Das Verb „brauen“ im Helgoländischen: mit Beibehaltung der starken Flexion und reich entwickelter Semantik

Us Wurk ◽  
2020 ◽  
Vol 69 (3-4) ◽  
pp. 105-114
Author(s):  
N. Århammar
Keyword(s):  
20Th Century ◽  
North Sea ◽  
Dictionary Entry ◽  
Figurative Meaning ◽  
Beer Brewing ◽  
The North ◽  
Starting Point ◽  
The North Sea ◽  
The Senses ◽  
Germanic Languages

The verb „brew“ in the North Frisian dialect of the North Sea island of Heligoland is in two respects remarkable: first it has retained its original strong inflection (section 1) and secondly it developed a number of special meanings during the 19/20th century (section 2). I have tried to demonstrate how this great diversity came about: The starting point for thesemantic development was probably the analogy ʽbrew kettleʼ (for beer brewing) ~ ʽsteam boilerʼ (of steam-boats). In a small seafaring nation a shift of meaning from ʽbrew (beer)ʼ → ʽdrive (a ship)ʼ may seem rather natural; less so the further steps via *ʽmove in generalʼ → ʽwalk briskly, runʼ and so on (→ ʽlive, keep house, manage to get on well (as a single)ʼand ʽbe busy, workʼ etc.). Sense 8. of the dictionary entry, a figurative meaning, stands apart, namely ʽconcoct, contrive, prepare, bring about, causeʼ: spec. evil, mischief, trouble, woe (OED). It is noted that this sense was developed in most Germanic languages and it probably represents a much older sprout on the helig. brau-tree than do the senses 2. to 7. Insection 3, I deal with the helig. idiom Bin brau ʽto bring into disorderʼ and the helig.-wfris. parallel uun Bin ~ yn ʼe/ʼt bûn ʽin disorderʼ. – In the appendix the revised and enlarged word article brau with its prefix compounds is presented

Impact of Climate Change on the North Sea Offshore Energy Sector

2018 ◽  
Author(s):  
Nicolas Fournier ◽  
Galina Guentchev ◽  
Justin Krijnen ◽  
Andy Saulter ◽  
Caroline Acton ◽  
...  
Keyword(s):  
Climate Change ◽  
Sea Level ◽  
North Sea ◽  
Wave Climate ◽  
Energy Industry ◽  
Strong Impact ◽  
Impact Of Climate Change ◽  
The North ◽  
Climate Indicators ◽  
The North Sea

The complex nature of the energy industry across extraction, transportation, processing, delivery and decommissioning creates significant challenges to how the sector responds, adapts and mitigates against risks posed by the changing future climate. Any disruption in this interconnected system will affect both industry and society. For example, in the summer of 2005 Hurricane Katrina and a month later Hurricane Rita had wide reaching impacts on the US offshore Oil and Gas industry which resulted in an increase in global oil prices due to loss of production and refinery shutdowns in the Gulf of Mexico. Preparing, mitigating and adapting to these climate changes is dependent upon identifying appropriate climate indicators as well as the associated critical operational thresholds and design criteria of the identified vulnerable assets. The characterization and understanding of the likely changes in these climate indicators will form the basis for adaptation plans and mitigating actions. The Met Office in collaboration with energy industry partners, under the Copernicus Clim4energy European project, has developed a Climate Change Risk Assessment tool, which allows the visualization and extraction of the most recent sea level and wave climate information to evaluate their future changes. This study illustrates the application of this tool for evaluation of the potential vulnerability of an offshore infrastructure in the North Sea. The analysis shows that for this asset there is a small increase in sea level of 0.20–0.30 m at the location of interest by 2050. However, there is a small decrease or no consistent changes projected in the future wave climate. This wave signal is small compared to the uncertainty of the wave projections and the associated inter-annual variability. Therefore, for the 2050s time horizon, at the location of interest, there is no strong impact of climate change at the annual scale on the significant wave height, the sea level and thus the associated climate change driven extreme water level. However, further analysis are required at the seasonal and monthly scales.

scholarly journals Assessing 20th century tidal range changes in the North Sea

2020 ◽  
Author(s):  
Leon Jänicke ◽  
Andra Ebener ◽  
Sönke Dangendorf ◽  
Arne Arns ◽  
Michael Schindelegger ◽  
...  
Keyword(s):  
20Th Century ◽  
North Sea ◽  
Tidal Range ◽  
The North ◽  
The North Sea

scholarly journals Wave Climate Change in the North Sea and Baltic Sea

2019 ◽  
Vol 7 (6) ◽  
pp. 166 ◽  
Author(s):  
Antonio Bonaduce ◽  
Joanna Staneva ◽  
Arno Behrens ◽  
Jean-Raymond Bidlot ◽  
Renate Anna Irma Wilcke
Keyword(s):  
Climate Change ◽  
Baltic Sea ◽  
Wave Height ◽  
North Sea ◽  
Significant Wave Height ◽  
Wave Climate ◽  
Significant Wave ◽  
The North ◽  
The North Sea

Wave climate change by the end of the 21st century (2075–2100) was investigated using a regional wave climate projection under the RCP 8.5 scenario. The performance of the historical run (1980–2005) in representing the present wave climate was assessed when compared with in situ (e.g., GTS) and remote sensing (i.e., Jason-1) observations and wave hindcasts (e.g., ERA5-hindcast). Compared with significant wave height observations in different subdomains, errors on the order of 20–30% were observed. A Principal Component (PC) analysis showed that the temporal leading modes obtained from in situ data were well correlated (0.9) with those from the historical run. Despite systematic differences (10%), the general features of the present wave climate were captured by the historical run. In the future climate projection, with respect to the historical run, similar wave climate change patterns were observed when considering both the mean and severe wave conditions, which were generally larger during summer. The range of variation in the projected extremes (±10%) was consistent with those observed in previous studies both at the global and regional spatial scales. The most interesting feature was the projected increase in extreme wind speed, surface Stokes drift speed and significant wave height in the Northeast Atlantic. On the other hand, a decrease was observed in the North Sea and the southern part of the Baltic Sea basin, while increased extreme values occurred in the Gulf of Bothnia during winter.

scholarly journals WAVE ENERGY DISTRIBUTION IN AN ESTUARY

1980 ◽  
Vol 1 (17) ◽  
pp. 139
Author(s):  
Volker Barthel
Keyword(s):  
Energy Distribution ◽  
North Sea ◽  
Deep Water ◽  
Wave Energy ◽  
German Bight ◽  
Wave Climate ◽  
Field Investigation ◽  
The North ◽  
Complex Wave ◽  
The North Sea

A field investigation program on waves in the Weser Estuary, German Bight of the North Sea, was started to learn about the complex wave climate in this region. The comparison of results in the various locations shows that most of the' wave energy is transferred from deep water across the reef region to the wadden area. The comparison of spectra in the different sites and the parametrization of these multipeak- spectra gives another feasibility to describe estuarine waves.

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