A5039011835- Climate change and permafrost
- Methane Hydrates and Related Phenomena
- Geology and Paleoclimatology Research
- Cryospheric studies and observations
- Arctic and Antarctic ice dynamics
- Geological Studies and Exploration
- Indigenous Studies and Ecology
- Arctic and Russian Policy Studies
- Polar Research and Ecology
- Atmospheric and Environmental Gas Dynamics
- Hydrocarbon exploration and reservoir analysis
- Marine and coastal ecosystems
- Peatlands and Wetlands Ecology
- Isotope Analysis in Ecology
- Ocean Acidification Effects and Responses
- Rangeland and Wildlife Management
- European history and politics
- Climate Change Communication and Perception
- Sociology and Education Studies
- Coastal and Marine Dynamics
- Marine and coastal plant biology
- Coastal wetland ecosystem dynamics
- Archaeology and ancient environmental studies
- Marine and environmental studies
- Geological and Geophysical Studies
Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung
2016-2025
LVR-Klinik für Orthopädie Viersen
2023
SRH Klinikum Karlsbad-Langensteinbach
2021
Utrecht University
2015-2016
John B. Pierce Laboratory
2004
Arctic coastal infrastructure and cultural archeological sites are increasingly vulnerable to erosion flooding due amplified warming of the Arctic, sea level rise, lengthening open water periods, a predicted increase in frequency major storms. Mitigating these hazards necessitates decision-making tools at an appropriate scale. The objectives this paper provide such tool by assessing potential flood Herschel Island, UNESCO World Heritage candidate site. This study focused on Simpson Point...
Abstract Permafrost is thawing extensively due to climate warming. When permafrost thaws, previously frozen organic carbon (OC) converted into dioxide (CO 2 ) or methane, leading further This process included in models as gradual deepening of the seasonal non‐frozen layer. Yet, neglect abrupt OC mobilization along rapidly eroding Arctic coastlines. We mimicked erosion an experiment by incubating with seawater for average open‐water season. found that CO production from efficient without. For...
ABSTRACT Four retrogressive thaw slumps (RTS) located on Herschel Island and the Yukon coast (King Point) in western Canadian Arctic were investigated to compare environmental, sedimentological geochemical setting characteristics of zones active stabilised at undisturbed sites. In general, slope, sedimentology biogeochemistry differ, independent their age or location. Organic carbon contents lower than surrounding tundra, density compaction slump sediments much greater. Radiocarbon dating...
Arctic coastal zones serve as a sensitive filter for terrigenous matter input onto the shelves via river discharge and erosion. This material is further distributed across by ocean currents sea ice. The regions are particularly vulnerable to changes related recent climate change. We compiled pan-Arctic review that looks into changing Holocene sources, transport processes sinks of sediment in Ocean. Existing palaeoceanographic studies demonstrate how warming disappearance ice sheets during...
Abstract Herschel Island in the southern Beaufort Sea is a push moraine at northwestern‐most limit of Laurentide Ice Sheet. Stable water isotope (δ 18 O, δD) and hydrochemical studies were applied to two tabular massive ground ice bodies unravel their genetic origin. Buried glacier or basal regelation was encountered beneath an ice‐rich diamicton with strong glaciotectonic deformation structures. The isotopic composition highly depleted heavy isotopes (mean δ O: −33‰; mean δD: −258‰),...
Abstract Reducing uncertainties about carbon cycling is important in the Arctic where rapid environmental changes contribute to enhanced mobilization of carbon. Here we quantify soil organic (SOC) contents permafrost soils along Yukon Coastal Plain and determine annual fluxes from coastal erosion. Different terrain units were assessed based on surficial geology, morphology, ground ice conditions. To account for volume wedge massive a unit, SOC reduced by 19% sediment 16%. The content 1 m 2...
Abstract Ice‐rich permafrost coasts in the Arctic are highly sensitive to climate warming and erode at a pace that exceeds global average. Permafrost deliver vast amounts of organic carbon into nearshore zone Ocean. Numbers on flux exist for particulate (POC) total or soil (TOC, SOC). However, they do not dissolved (DOC), which is known be bioavailable. This study aims estimate DOC stocks coastal as well annual ocean. concentrations ground ice were analyzed along ice‐rich Yukon coast (YC)...
The degradation of ice-rich permafrost deposits has the potential to release large amounts old carbon (C) and nitrogen (N) with severe local implications such as affecting riverine near-shore zone ecosystems but also global impacts greenhouse gases into atmosphere. Here we study rapid erosion up 27.7 m high 1,660 long Sobo-Sise yedoma cliff in Lena River Delta using a remote sensing-based time-series analysis covering 53 years calculate mean annual sediment well C N River. We find that...
Abstract Detailed organic geochemical and carbon isotopic (δ 13 C Δ 14 C) analyses are performed on permafrost deposits affected by coastal erosion (Herschel Island, Canadian Beaufort Sea) adjacent marine sediments Basin) to understand the fate of in Arctic nearshore environments. We use an end‐member model based composition bulk matter identify sources carbon. Monte Carlo simulations applied quantify contribution sedimentary budget. The models suggest that ~40% all released local is...
Warming air and sea temperatures, longer open-water seasons sea-level rise collectively promote the erosion of permafrost coasts in Arctic, which profoundly impacts organic matter pathways. Although estimates on carbon (OC) fluxes from exist for some parts little is known about how much OC transformed into greenhouse gases (GHGs). In this study we investigated two different coastal scenarios Qikiqtaruk – Herschel Island (Canada) estimate potential GHG formation. We distinguished between a...
Abstract. Permafrost soils are particularly vulnerable to climate change. To assess and improve estimations of carbon (C) nitrogen (N) budgets it is necessary accurately map soil in the permafrost region. In particular, organic (SOC) stocks have been predicted mapped by many studies from local pan-Arctic scales. Several carried out at Canadian Beaufort Sea coast, though no regional synthesis terrestrial based on spatial modelling has conducted yet. This study synthesises available field data...
The Arctic is experiencing unprecedented rates of warming. coastal environments are particularly vulnerable to the consequences: thawing permafrost, decline sea ice, and increased fluxes sediment, organic carbon nutrients across land-ocean interface. These effects global climate change drive significant transformations in biogeochemistry ecosystems, with severe implications for local communities. However, responses nearshore ecosystems these changes, as well involved mechanisms driving...
Abstract. Thermal permafrost degradation and coastal erosion in the Arctic remobilize substantial amounts of organic carbon (OC) nutrients which have accumulated late Pleistocene Holocene unconsolidated deposits. Permafrost vulnerability to thaw subsidence, collapsing coastlines irreversible landscape change are largely due presence large massive ground ice such as wedges. However, has not, until now, been considered be a source dissolved (DOC), inorganic (DIC) other elements important for...
Permafrost landscapes experience different disturbances and store large amounts of organic matter, which may become a source greenhouse gases upon permafrost degradation. We analysed the influence terrain geomorphic (e.g. soil creep, active-layer detachment, gullying, thaw slumping, accumulation fluvial deposits) on carbon (SOC) total nitrogen (TN) storage using 11 cores from Herschel Island, western Canadian Arctic. Our results indicate strong correlation between SOC topographic wetness...
Changing environmental and geomorphological conditions are resulting in vegetation change ice-wedge polygons Arctic tundra. However, we do not yet know how microscale patterns relate to individual parameters. This work aims at examining these relations polygonal terrain. We analysed composition cover of vascular plant taxa surface height, active layer depth, soil temperature, carbon nitrogen content, pH electrical conductivity four polygon mires located on the Yukon coast. found that species...
Ice-rich permafrost coasts often undergo rapid erosion, which results in land loss and release of considerable amounts sediment, organic carbon nutrients, impacting the near-shore ecosystems. Because lack volumetric erosion data, Arctic coastal studies typically report on planimetric erosion. Our aim is to explore relationship between measurements update rates Herschel Island Canadian Arctic. We used high-resolution digital elevation models compute sediment compare data estimations coastline...
Collapse of permafrost coasts delivers large quantities particulate organic carbon (POC) to Arctic coastal areas. With rapidly changing environmental conditions, sediment and (OC) mobilization transport pathways are also changing. Here, we assess the sources sinks POC in highly dynamic nearshore zone Herschel Island-Qikiqtaruk (Yukon, Canada). Our results show that concentrations sharply decrease, from 15.9 0.3 mg L-1, within first 100-300 m offshore. Simultaneously, radiocarbon ages drop...
Abstract Erosion of permafrost coasts due to climate warming releases large quantities organic carbon (OC) into the Arctic Ocean. While burial OC in marine sediments potentially limits degradation, resuspension nearshore zone enhances degradation and greenhouse gas production, adding “permafrost feedback.” Recent studies, focusing on bulk sediments, suggest that derived from coastal erosion is predominantly deposited close shore. However, approaches disregard sorting processes zone, which...