Sandbanks, sandwaves and megaripples on Spitsbergenbanken, Barents Sea

Bellec, Valérie; Bøe, Reidulv; Bjarnadóttir, Lilja Rún; Albretsen, Jon; Dolan, Margaret F.J.; Chand, Shyam; Thorsnes, Terje; Jakobsen, Frank Werner; Nixon, Chantel; Plassen, Liv; Jensen, Henning; Baeten, Nicole J.; Olsen, Heidi A.; Elvenes, Sigrid

doi:10.1016/j.margeo.2019.105998

Cited by 14 publications

(12 citation statements)

References 35 publications

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“…Furthermore, data from long-term bathysnap deployments in the northwestern part of the Porcupine Basin, between 1300 and 4000 m show dominant northward along-slope currents following local topography . Located closer to the southwest coast of Ireland is KP, a high-energy environment where modern-day sediments sources are terrigenous recorded MPs at all sites . Due to the opportunistic sampling nature conducted in this study, assessment of the underwater current regimes as a variable in the distribution of MPs was not assessed; however, evidence of sand waves and current-induced bedforms present (in video recordings) are indicative of a high-energy environment suggesting erosion and transport that the seafloor is swept by relatively strong currents. , …”

Section: Discussionmentioning

confidence: 96%

Deep Sea Microplastic Pollution Extends Out to Sediments in the Northeast Atlantic Ocean Margins

Nash¹,

Joyce²,

Pagter

et al. 2022

Environ. Sci. Technol.

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Microplastics are ubiquitous emerging contaminants found in every habitat surveyed, building upon international databases globally. Costs and accessibility often correlate to few deep sea sediment surveys, restricting the number of stations within a given sampling area. An extensive survey of the Porcupine Seabight, Porcupine Bank, the Goban Spur, and south-western canyons resulted in identifying microplastics in deep sea sediment surface layers from 33 of the 44 stations sampled (75%), with a total of 83 particles (74 synthetic and 9 natural) recorded. No microplastic hotspots were identified, and abundances (kg d.w. −1 ) were not correlated with distance from land, depth, or the presence of macrolitter on the seafloor. Understanding the sources of deep sea microplastics, such as marine traffic, is crucial to developing effective mitigation strategies as well as further monitoring campaigns targeting microplastic pollution in areas with significant deep sea biodiversity such as the Porcupine Seabright.

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Section: Discussionmentioning

confidence: 96%

Deep Sea Microplastic Pollution Extends Out to Sediments in the Northeast Atlantic Ocean Margins

Nash¹,

Joyce²,

Pagter

et al. 2022

Environ. Sci. Technol.

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“…The type, distribution, and thickness of the majority of unlithified sediments in the study area are a result of glacial and oceanographic processes during the late Pleistocene and Early Holocene, rather than contemporary processes (e.g., Elverhøi et al, 1993;Bjarnadóttir et al, 2014). Similarly, most of the fine-scale seafloor geomorphic features record processes related to the last deglaciation of the area (e.g., Bjarnadóttir et al, 2014), although some areas have since been reshaped by oceanographic processes (e.g., Bellec et al, 2019). Geomorphic features from broad-scale landscapes ( Figure 1B) to smaller landforms have been widely documented to be linked to benthic habitat (Harris and Baker, 2011).…”

Section: Geological Settingmentioning

confidence: 93%

Classification and Mapping of Benthic Biotopes in Arctic and Sub-Arctic Norwegian Waters

et al. 2020

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“…Sub-aqueous bedforms have been extensively studied for decades given that they may represent a significant hazard to navigation and offshore engineering [8,9], a potential target for offshore sand mining [10] or constitute marine habitats [11]. Additionally, their study can help to better understand local hydrodynamics [12], seabed sediment mobility [13,14] and, more largely, surface processes [2].…”

Section: Introductionmentioning

confidence: 99%

Automatic Mapping and Characterisation of Linear Depositional Bedforms: Theory and Application Using Bathymetry from the North West Shelf of Australia

Lebrec

Riera²,

Paumard

et al. 2022

Remote Sensing

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Bedforms are key components of Earth surfaces and yet their evaluation typically relies on manual measurements that are challenging to reproduce. Several methods exist to automate their identification and calculate their metrics, but they often exhibit limitations where applied at large scales. This paper presents an innovative workflow for identifying and measuring individual depositional bedforms. The workflow relies on the identification of local minima and maxima that are grouped by neighbourhood analysis and calibrated using curvature. The method was trialed using a synthetic digital elevation model and two bathymetry surveys from Australia’s northwest marine region, resulting in the identification of nearly 2000 bedforms. The comparison of the metrics calculated for each individual feature with manual measurements show differences of less than 10%, indicating the robustness of the workflow. The cross-comparison of the metrics resulted in the definition of several sub-types of bedforms, including sandwaves and palaeoshorelines, that were then correlated with oceanic conditions, further corroborating the validity of the workflow. Results from this study support the idea that the use of automated methods to characterise bedforms should be further developed and that the integration of automated measurements at large scales will support the development of new classification charts that currently rely solely on manual measurements.

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Sandbanks, sandwaves and megaripples on Spitsbergenbanken, Barents Sea

Cited by 14 publications

References 35 publications

Deep Sea Microplastic Pollution Extends Out to Sediments in the Northeast Atlantic Ocean Margins

Deep Sea Microplastic Pollution Extends Out to Sediments in the Northeast Atlantic Ocean Margins

Classification and Mapping of Benthic Biotopes in Arctic and Sub-Arctic Norwegian Waters

Automatic Mapping and Characterisation of Linear Depositional Bedforms: Theory and Application Using Bathymetry from the North West Shelf of Australia

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