A5039065172- Climate change and permafrost
- Methane Hydrates and Related Phenomena
- Cryospheric studies and observations
- Arctic and Antarctic ice dynamics
- Geology and Paleoclimatology Research
- Geological Studies and Exploration
- Indigenous Studies and Ecology
- Arctic and Russian Policy Studies
- Polar Research and Ecology
- Atmospheric and Environmental Gas Dynamics
- Landslides and related hazards
- Peatlands and Wetlands Ecology
- Marine and environmental studies
- Marine and coastal ecosystems
- Hydrocarbon exploration and reservoir analysis
- Coastal and Marine Dynamics
- Aquatic and Environmental Studies
- Ocean Acidification Effects and Responses
- Groundwater and Isotope Geochemistry
- Isotope Analysis in Ecology
- Smart Materials for Construction
- Oceanographic and Atmospheric Processes
- Rangeland and Wildlife Management
- Maritime and Coastal Archaeology
- Archaeology and Natural History
Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung
2016-2025
University of Potsdam
2016-2025
Potsdam Institute for Climate Impact Research
2024
Environment and Climate Change Canada
2020
University of Lisbon
2020
Trent University
2020
Stockholm University
2020
University of Vienna
2020
McGill University
2007
Permafrost warming has the potential to amplify global climate change, because when frozen sediments thaw it unlocks soil organic carbon. Yet date, no globally consistent assessment of permafrost temperature change been compiled. Here we use a data set time series from Global Terrestrial Network for evaluate across regions period since International Polar Year (2007-2009). During reference decade between 2007 and 2016, ground near depth zero annual amplitude in continuous zone increased by...
Degrading permafrost can alter ecosystems, damage infrastructure, and release enough carbon dioxide (CO2) methane (CH4) to influence global climate. The feedback (PCF) is the amplification of surface warming due CO2 CH4 emissions from thawing permafrost. An analysis available estimates PCF strength timing indicate 120 ± 85 Gt by 2100. This equivalent 5.7 4.0% total anthropogenic for Intergovernmental Panel on Climate Change (IPCC) representative concentration pathway (RCP) 8.5 scenario would...
Abstract. The Global Terrestrial Network for Permafrost (GTN-P) provides the first dynamic database associated with Thermal State of (TSP) and Circumpolar Active Layer Monitoring (CALM) programs, which extensively collect permafrost temperature active layer thickness (ALT) data from Arctic, Antarctic mountain regions. purpose GTN-P is to establish an early warning system consequences climate change in regions provide standardized thermal global models. In this paper we introduce perform...
Abstract The arctic environment is changing: air temperatures, major river discharges and open water season length have increased, storm intensities tracks are changing. Thirteen quantitative studies of the rates coastline position change throughout Arctic show that recently observed environmental changes not led to ubiquitously or continuously increasing coastal erosion rates, which currently range between 0 2 m/yr when averaged for shelf seas. Current data probably insufficient, both...
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 Offshore permafrost plays a role in the global climate system, but observations of thickness, state, and composition are limited to specific regions. The current map shows potential offshore distribution based on bathymetry sea level rise. As first‐order estimate, we employ heat transfer model calculate subsurface temperature field. Our uses dynamic upper boundary conditions that synthesize Earth System Model air temperature, ice mass reconstruction applies globally distributed...
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 Retrogressive thaw slumps (RTSs) are among the most active landforms in Arctic; their number has increased significantly over past decades. While processes initiating discrete RTSs well identified, major terrain controls on development of coastal at a regional scale not yet defined. Our research reveals main geomorphic factors that determine along 238 km segment Yukon Coast, Canada. We (1) show current extent RTSs, (2) ascertain controlling activity and initiation, (3) explain...
Abstract Permafrost thaw is a challenge in many Arctic regions, one that modifies ecosystems and affects infrastructure livelihoods. To date, there have been no demographic studies of the population on permafrost. We present first estimates number inhabitants permafrost Circumpolar Region (ACPR) project changes as result thaw. combine current projected populations at settlement level with extent. Key findings indicate are 1162 settlements ACPR, accommodating 5 million inhabitants, whom 1...
This study investigates the rate of erosion during 1951-2006 period on Bykovsky Peninsula, located north-east harbour town Tiksi, north Siberia. Its coastline, which is characterized by presence ice-rich sediment (Ice Complex) and vicinity Lena River Delta, retreated at a mean 0.59 m/yr between 1951 2006. Rates ranged from 434 m to 92 accretion these 56 years exhibited large variability (?=45.4). Ninety-seven percent rates observed were less than 2 81.6% 1 m/yr. No significant trend in could...
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...
Permafrost-affected soils are among the most obvious ecosystems in which current microbial controls on organic matter decomposition changing as a result of global warming. Warmer conditions polygonal tundra will lead to deepening seasonal active layer, provoking changes processes and possibly resulting exacerbated carbon degradation under increasing anoxic conditions. To identify assemblages rich, water saturated permafrost environments, four sites were investigated Herschel Island Yukon...
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‰),...
In Arctic wet tundra, microbial controls on organic matter decomposition are likely to be altered as a result of climatic disruption. Here, we present study the activity, diversity and vertical distribution methane-cycling communities in active layer polygonal tundra Herschel Island. We recorded potential methane production rates from 5 40 nmol h(-1) g(-1) soil at 10 °C significantly higher oxidation reaching values 6-10 μmol soil. Terminal restriction fragment length polymorphism (T-RFLP)...
Abstract To better understand the reaction of Arctic coasts to increasing environmental pressure, coastal changes along a 210‐km length Yukon Territory coast in north‐west Canada were investigated. Shoreline positions acquired from aerial and satellite images between 1951 2011. change rates calculated for multiple time periods entire at six key sites. Additionally, Differential Global Positioning System (DGPS) measurements shoreline seven field sites used analyze dynamics 1991 2015 higher...
ABSTRACT Permafrost coasts make up to 34 per cent of the world's coastlines. Erosion these currently averages 0.5 m a ‐1 , which is similar or greater than rates observed in temperate regions. The erosion rate has risen on Arctic coast Alaska during first decade 21 st century as minimum sea ice extent declined. Increasing leads higher engineering and relocation costs for coastal villages (US$140 million Kivalina alone adapt eventually relocate), quantities organic carbon contained permafrost...