A5027834278- Cryospheric studies and observations
- Arctic and Antarctic ice dynamics
- Methane Hydrates and Related Phenomena
- Geology and Paleoclimatology Research
- Marine and coastal ecosystems
- Polar Research and Ecology
- Climate change and permafrost
- Atmospheric and Environmental Gas Dynamics
- Marine and fisheries research
- Microbial Community Ecology and Physiology
- Oceanographic and Atmospheric Processes
- Isotope Analysis in Ecology
- Ocean Acidification Effects and Responses
- Marine and coastal plant biology
- Marine Biology and Ecology Research
- Mercury impact and mitigation studies
- Geological Studies and Exploration
- Winter Sports Injuries and Performance
- Pleistocene-Era Hominins and Archaeology
- Microbial Fuel Cells and Bioremediation
- Environmental DNA in Biodiversity Studies
- Marine animal studies overview
- Fish Ecology and Management Studies
- Geochemistry and Elemental Analysis
- Protist diversity and phylogeny
Grønlands Naturinstitut
2016-2025
Royal Netherlands Institute for Sea Research
2016-2025
Utrecht University
2017-2025
Aarhus University
2016-2024
Asiaq Greenland Survey
2022
Arctic Research Centre
2020
Ilisimatusarfik
2019-2020
Ghent University
2012-2016
Abstract Accelerated mass loss from the Greenland ice sheet leads to glacier retreat and an increasing input of glacial meltwater fjords coastal waters around Greenland. These high latitude ecosystems are highly productive sustain important fisheries, yet it remains uncertain how they will respond future changes in Arctic cryosphere. Here we show that marine‐terminating glaciers play a crucial role sustaining productivity fjord ecosystems. Hydrographic biogeochemical data two systems...
Abstract. Freshwater discharge from glaciers is increasing across the Arctic in response to anthropogenic climate change, which raises questions about potential downstream effects marine environment. Whilst a combination of long-term monitoring programmes and intensive field campaigns have improved our knowledge glacier–ocean interactions recent years, especially with respect fjord/ocean circulation, there are extensive gaps concerning how affect biogeochemistry productivity. Following two...
Runoff from the Greenland Ice Sheet (GrIS) is thought to enhance marine productivity by adding bioessential iron and silicic acid coastal waters. However, experimental data suggest nitrate main summertime growth-limiting resource in regions affected meltwater around Greenland. While contains low concentrations, subglacial discharge plumes marine-terminating glaciers entrain large quantities of deep seawater. Here, we characterize fluxes that arise entrainment seawater within these using a...
Abstract Silica is an essential element for marine life and plays a key role in the biogeochemistry of ocean. Glacial activity stimulates rock weathering, generating dissolved silica that exported to coastal areas along with meltwater. The magnitude export from large glacial such as Greenland Ice Sheet presently poorly quantified not accounted global budgets. Here we present data two fjord systems adjacent which reveal by meltwater relative other macronutrients. Upscaled entire Sheet, equals...
Abstract. Recently, long filamentous bacteria have been reported conducting electrons over centimetre distances in marine sediments. These so-called cable perform an electrogenic form of sulfur oxidation, whereby long-distance electron transport links sulfide oxidation deeper sediment horizons to oxygen reduction the upper millimetres sediment. Electrogenic exerts a strong impact on local biogeochemistry, but it is currently unknown how prevalent process within seafloor. Here we provide...
Abstract. The Greenland Ice Sheet releases large amounts of freshwater, which strongly influences the physical and chemical properties adjacent fjord systems continental shelves. Glacial meltwater input is predicted to increase in future, but impact on carbonate dynamics these productive coastal remains largely unquantified. Here we present seasonal observations system over year 2013 surface waters a west (Godthåbsfjord) influenced by tidewater outlet glaciers. Our data reveal that layer...
Abstract The accelerated melt of the Greenland Ice Sheet has been linked to a sudden increase in presence warm subsurface coastal water west Greenland. Yet pathways along entire coast have remained largely unstudied. Here we present first, near‐synoptic hydrographic observations at both continental slope and fjord entrances system from Cape Farewell (59°N) Melville Bay (75°N) summer 2016. We observed distinct north‐south division mass distribution Greenland, approximately partitioned by...
Global warming accelerates melting of glaciers and increases the supply meltwater associated inorganic particles, nutrients, organic matter to adjacent coastal seas, but ecosystem impact is poorly resolved quantified. When delivered by glacial rivers, potential could be a reduction in light nutrient availability for primary producers while supplying allochthonous carbon heterotrophic processes, thereby tipping net community metabolism toward heterotrophy. To test this hypothesis, we...
The melting of the Greenland Ice Sheet is accelerating, with glaciers shifting from marine to land termination and potential consequences for fjord ecosystems downstream. Monthly samples in 2016 two fjords southwest show that subglacial discharge marine-terminating sustains high phytoplankton productivity dominated by diatoms grazed larger mesozooplankton throughout summer. In contrast, land-terminating results a ecosystem bacteria, picophytoplankton smaller zooplankton, which has only...
Abstract. Climate change and changing nutrient loadings are the two main aspects of global that linked to increase in prevalence coastal hypoxia – depletion oxygen bottom waters areas. However, it remains uncertain how strongly these drivers will each risk over next decades. Through model simulations we have investigated relative influence climate run-off on water dynamics Oyster Grounds, an area central North Sea experiencing summer stratification. Simulations were performed with a...
Marine phytoplankton growth at high latitudes is extensively limited by iron availability. Icebergs are a vector transporting the bioessential micronutrient into polar oceans. Therefore, increasing iceberg fluxes due to global warming have potential increase marine productivity and carbon export, creating negative climate feedback. However, magnitude of flux, subsequent fertilization effect resultant export not been quantified. Using analysis samples, we reveal that concentrations vary over...
Abstract. Primary production on the coast and in Greenland fjords sustains important local sustenance fisheries. However, unprecedented melting of Ice Sheet (GrIS) is impacting coastal ocean, its effects fjord ecology remain understudied. It has been suggested that as glaciers retreat, primary regimes may be altered, rendering less productive. Here we investigate patterns productivity a northeast (Young Sound, 74∘ N), which receives run-off from GrIS via land-terminating glaciers. We...
Abstract. The Arctic Ocean is considered the most vulnerable ecosystem to ocean acidification, and large-scale assessments of pH saturation state for aragonite (Ωarag) have led notion that already close a corrosive state. In high-latitude coastal waters regulation Ωarag is, however, far more complex than offshore because increased biological activity input glacial meltwater affect pH. Effects acidification on calcifiers non-calcifying phototrophs occupying habitats cannot be derived from...
Greenland's ice sheet is the second largest on Earth, and under threat from a warming Arctic climate. An increase in freshwater discharge Greenland has potential to strongly influence composition of adjacent water masses with impact marine ecosystems likely be found within glaciated fjords. Here we demonstrate that physical chemical estuarine processes large Greenlandic fjord are critical factors determining fate meltwater derived nutrients particles, especially for non-conservative elements...
Abstract In high‐latitude fjord ecosystems, the spring bloom accounts for a major part of annual primary production and thus provides crucial energy supply to marine food web. However, environmental factors that control timing intensity these blooms remain uncertain. 2013, we studied dynamics in Godthåbsfjord, large system adjacent Greenland Ice Sheet. Our surveys revealed did not initiate inner stratified but only started farther away from tidewater outlet glaciers. A combination out‐fjord...
Abstract Buoyant freshwater released at depth from under Greenland's marine‐terminating glaciers gives rise to vigorous buoyant discharge plumes adjacent the termini. The water mass found down fjord formed by mixing of subglacial and ambient subsequent modification glacial ice melt in mélange is referred as water. It substantially affects both physical chemical properties fjords' marine environment. Despite importance this source, many uncertainties remain regarding its transformation...
Abstract The Greenland Ice Sheet is currently not accounted for in Arctic mercury budgets, despite large and increasing annual runoff to the ocean socio-economic concerns of high levels organisms. Here we present concentrations meltwaters from three glacial catchments on southwestern margin evaluate export downstream fjords based samples collected during summer ablation seasons. We show that dissolved are among highest recorded natural waters yields these (521–3,300 mmol km −2 year −1 ) two...
Rapid mass loss from the Greenland Ice Sheet is affecting sea level and, through increased freshwater discharge, ocean circulation, sea-ice, biogeochemistry, and marine ecosystems around Greenland. Key to interpreting ongoing projecting future ice loss, its impact on ocean, understanding exchanges of heat, freshwater, nutrients that occur at Greenland's margins. Processes governing these are poorly understood because limited observations regions where glaciers terminate into challenge model...
Around the Greenlandic and Antarctic coastlines, sediment plumes associated with glaciers are significant sources of lithogenic material to ocean. These contain elevated concentrations a range trace metals, especially in particle bound phases, but it is not clear how these particles affect dissolved (<0.2 µm) metal distributions Here we show, using transects 8 glacier fjords, trends distribution iron, cobalt, nickel copper (dFe, dCo, dNi, dCu). Following rapid dFe loss close outflows,...
Greenland's fjords and coastal waters are highly productive sustain important fisheries. However, retreating glaciers increasing meltwater changing fjord circulation biogeochemistry, which may threaten future productivity. The freshening of Greenland caused by unprecedented melting the Ice Sheet alter carbonate chemistry in waters, influencing CO2 uptake causing biological consequences from acidification. few studies to date explore current acidification state waters. Here we present...
Abstract. The magnitude, source, release location, and timing of freshwater fluxes that end up in the numerous Greenland fjords is special interest for ice-ocean interactions ecosystems. In this study, we investigate intra- interannual variability various sources Greenland’s seven climatologically distinct regions. For this, use direct statistically downscaled output from regional climate models mass fluxes, process-based estimates basal melt observational data solid ice discharge. period...
Abstract In recent years, optical imaging has emerged as a promising tool for in situ observations of plankton. this study, we aimed to compare the plankton community estimates obtained from Video Plankton Recorder (VPR) device with net‐based approaches. By collecting VPR and net samples clear waters large‐sized eutrophic small‐sized plankton, spatial temporal patterns densities composition were compared. Furthermore, it allowed evaluation performance methods under diverse hydrographic...
Abstract Subglacial weathering releases biologically important nutrients into meltwaters that have the potential to influence downstream ecosystems. There is a need understand how accelerated glacial retreat could impact biogeochemical cycling in coastal regions near future. However, fjords—important gateways connecting Greenland ice sheet and oceans—are highly heterogeneous environments both space time. Here, we investigate temporal variability of nutrient dynamics glacier‐fed fjord (Nuup...