A5046544454- Geology and Paleoclimatology Research
- Underwater Acoustics Research
- Methane Hydrates and Related Phenomena
- Geological formations and processes
- Marine and coastal ecosystems
- Marine and fisheries research
- Coral and Marine Ecosystems Studies
- Marine Biology and Ecology Research
- Marine animal studies overview
- Marine and coastal plant biology
- Atmospheric and Environmental Gas Dynamics
- Marine and environmental studies
- Coastal wetland ecosystem dynamics
- Isotope Analysis in Ecology
- Coastal and Marine Dynamics
- Geochemistry and Geologic Mapping
- Ocean Acidification Effects and Responses
- Oceanographic and Atmospheric Processes
- Soil Geostatistics and Mapping
- Geographic Information Systems Studies
- Coastal and Marine Management
- Geological Modeling and Analysis
- Maritime and Coastal Archaeology
- Hydrocarbon exploration and reservoir analysis
- Marine Bivalve and Aquaculture Studies
Norwegian Geological Survey
2017-2024
Posten (Norway)
2017-2024
Centre for Environment, Fisheries and Aquaculture Science
2011-2020
Kiel University
2001-2013
Detailed seabed substrate maps are increasingly in demand for effective planning and management of marine ecosystems resources. It has become common to use remotely sensed multibeam echosounder data the form bathymetry acoustic backscatter conjunction with ground-truth sampling inform mapping substrates. Whilst, until recently, such sets have typically been classified by expert interpretation, it is now obvious that more objective, faster repeatable methods classification required. This...
A carbon budget for the northwest European continental shelf seas (NWES) was synthesised using available estimates coastal, pelagic and benthic stocks flows. Key uncertainties were identified effect of future impacts on assessed. The water contains between 210 230 Tmol absorbs 1.3 3.3 from atmosphere annually. Off-shelf transport burial in sediments account 60-100% 0-40% outputs NWES, respectively. Both these fluxes remain poorly constrained by observations resolving their magnitudes...
Evidence shows that habitats with potential to mitigate against greenhouse gases emissions, by taking up and storing CO2, are being lost due the effects of on-going human activities climate change. The carbon storage terrestrial (e.g. tropical forests) role coastal (‘Blue Carbon’) as sinks is well recognised. Offshore shelf sediments also a manageable store, covering ∼9% global marine area, but not currently protected international agreements enable their conservation. Through scenario...
Maps that depict the distribution of substrate, habitat or biotope types on seabed are in increasing demand by marine ecologists and spatial planners, underpinning decision making relation to planning protected area network design. Yet, science discipline image-based mapping has not fully matured rapid progress is needed improve reliability accuracy maps. To speed up process we have conducted a literature review common practices terrestrial image classification based remote sensing data,...
Shelf seas and their associated benthic habitats represent key systems in the global carbon cycle. However, quantification of related stocks flows are often poorly constrained. To address storage North–West European continental shelf, we have spatially predicted mass particulate organic (POC) stored top 10 cm shelf sediments parts North Sea, English Channel Celtic Sea using a Random Forest model, POC measurements on surface from those relevant predictor variables. The presented model...
There is a need for fit-for-purpose maps accurately depicting the types of seabed substrate and habitat properties benefits research, resource management, conservation spatial planning. The aim this study to determine whether it possible predict composition across large area using legacy grain-size data environmental predictors. includes North Sea up approximately 58.44°N United Kingdom's parts English Channel Celtic Seas. analysis combines outputs from hydrodynamic models as well optical...
Seabed sediment composition is an important component of benthic habitat and there are many approaches for producing maps that convey information to marine managers. Random Forest a popular statistical method thematic seabed mapping using both categorical quantitative supervised modelling approaches. This study compares the performance qualities these predict distribution fine-grained sediments from grab samples as one multi-model map classes in Frobisher Bay, Nunavut, Canada. The second...
Abstract. Continental shelf sediments are places of both rapid organic carbon turnover and accumulation, while at the same time increasingly subjected to human-induced disturbances. Recent research suggests that might have a role play as natural climate solution, e.g. by storing if left undisturbed from anthropogenic activity. However, we an incomplete understanding about centres accumulation storage on continental shelves. To better constrain rate mass is stored in sediments, developed...
High alkalinity values observed in coastal seas promote the uptake of CO 2 from atmosphere. However, budget areas and marginal is poorly understood, even though some recently enhancement can be ascribed to riverine fluxes anaerobic processes shelf sediments. Here, we investigate Baltic Sea identify previously unrecognized sources. We quantify generation dissolved calcium (Ca) this sea applying simple mass balance calculations. Using approach, Ca sources approximately 324 Gmol yr -1 122 ,...
Sediment maps developed from categorical data are widely applied to support marine spatial planning across various fields. However, deriving independently of sediment classification potentially improves our understanding environmental gradients and reduces issues harmonising jurisdictional boundaries. As the groundtruth samples often measured for fractions mud, sand gravel, this can be utilised more effectively produce quantitative composition. Using harmonised products a range sources...
Sediment fluxes to the seafloor govern fate of elements and compounds in ocean serve as a prerequisite for research on elemental cycling, benthic processes sediment management strategies. To quantify these over areas, it is necessary scale up mass accumulation rates (MAR) obtained from multiple sample stations. Conventional methods spatial upscaling involve averaging data or interpolation. However, approaches may not be sufficiently precise account variations MAR, leading poorly constrained...
Abstract Diesing, M., Stephens, D., and Aldridge, J. 2013. A proposed method for assessing the extent of seabed significantly affected by demersal fishing in Greater North Sea. – ICES Journal Marine Science, 70: 1085–1096. The widespread impact bottom towed gear on benthic species communities has long been recognized. responses to a given intensity disturbance can be influenced which these are preconditioned natural processes, particular waves currents. advent vessel monitoring system (VMS)...
The ocean floor, its species and habitats are under pressure from various human activities. Marine spatial planning nature conservation aim to address these threats but require sufficiently detailed accurate maps of the distribution seabed substrates habitats. Benthic habitat mapping has markedly evolved as a discipline over last decade, important challenges remain. To test adequacy current data products classification approaches, we carried out comparative study based on common dataset...
Cold-water coral reefs are rich, yet fragile ecosystems found in colder oceanic waters. Knowledge of their spatial distribution on continental shelves, slopes, seamounts and ridge systems is vital for marine planning conservation. corals frequently form conspicuous carbonate mounds varying sizes, which identifiable from multibeam echosounder bathymetry derived geomorphometric attributes. However, the often-large number makes manual interpretation mapping a tedious process. We present...
Thematic maps are important for a range of disciplines including spatial planning and ecosystem status assessments. Despite an increasing focus on accuracy assessment methods to ensure fit purpose, the adoption these recommendations has not been widespread. We present methodology which utilises bootstrap aggregation adheres recommended practices Furthermore, additional information is extracted from model outputs produce confidence also supporting map interpretation. The applied two study...
Abstract. Although the deep-sea floor accounts for approximately 60 % of Earth's surface, there has been little progress in relation to deriving maps seafloor sediment distribution based on transparent, repeatable, and automated methods such as machine learning. A new digital map spatial lithologies below 500 m water depth is presented address this shortcoming. The lithology accompanied by estimates probability most probable class, which may be interpreted a spatially explicit measure...
Abstract. Continental shelves are critical for the global carbon cycle, storing substantial amounts of organic (OC) over geological timescales. Shelf sediments can also be subject to considerable anthropogenic pressures, offshore construction and bottom trawling example, potentially releasing OC that has been sequestered into sediments. As a result, these have attracted attention from policy makers regarding how their management leveraged meet national emissions reductions targets. Spatial...