A5021212455- Climate change and permafrost
- Methane Hydrates and Related Phenomena
- Cryospheric studies and observations
- Geological Studies and Exploration
- Arctic and Antarctic ice dynamics
- Geology and Paleoclimatology Research
- Indigenous Studies and Ecology
- Arctic and Russian Policy Studies
- Polar Research and Ecology
- Marine and environmental studies
- Landslides and related hazards
- Atmospheric and Environmental Gas Dynamics
- Geological Modeling and Analysis
- Marine and coastal plant biology
- Hydrocarbon exploration and reservoir analysis
- Ocean Acidification Effects and Responses
- Coastal and Marine Management
- Peatlands and Wetlands Ecology
- Remote Sensing and Land Use
- Geographic Information Systems Studies
- Soil and Environmental Studies
- Planetary Science and Exploration
- Aquatic and Environmental Studies
- Soil Geostatistics and Mapping
- Aerospace Engineering and Energy Systems
Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung
2013-2024
Neubrandenburg University of Applied Sciences
2022-2024
University of Potsdam
2019-2021
Lomonosov Moscow State University
2019-2021
Booz Allen Hamilton (United States)
1981
Abstract. Permafrost coasts in the Arctic are susceptible to a variety of changing environmental factors all which currently point increasing coastal erosion rates and mass fluxes sediment carbon shallow arctic shelf seas. Rapid along high yedoma composed Ice Complex permafrost deposits creates impressive ice cliffs inspired research for designing implementing change detection studies long time, but continuous quantitative monitoring qualitative inventory thermo-erosion large coastline...
Abstract. Observations of coastline retreat using contemporary very high resolution satellite and historical aerial imagery were compared to measurements open water fraction, summer air temperature, wind. We analysed seasonal interannual variations thawing-induced cliff top (thermo-denudation) marine abrasion (thermo-abrasion) on Muostakh Island in the southern central Laptev Sea. Geomorphometric analysis revealed that total ground ice content is made up equal amounts intrasedimentary macro...
Ice-rich permafrost in the circum-Arctic and sub-Arctic (hereafter pan-Arctic), such as late Pleistocene Yedoma, are especially prone to degradation due climate change or human activity. When Yedoma deposits thaw, large amounts of frozen organic matter biogeochemically relevant elements return into current biogeochemical cycles. This mobilization has local global implications: increased thaw thermokarst thermal erosion settings enhances greenhouse gas fluxes from regions. In addition, this...
Abstract. Distinctive periglacial landscapes have formed in late-Pleistocene ice-rich permafrost deposits (Ice Complex) of northern Yakutia, Siberia. Thermokarst lakes and thermokarst basins alternate with Yedoma uplands. We investigate different stages Ice Complex the Lena River Delta using remote sensing geoinformation techniques. The morphometry spatial distribution on uplands, basins, are analyzed, possible dependence upon relief position cryolithological context is considered. Of these...
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...
Eroding permafrost coasts are likely indicators and integrators of changes in the Arctic System as they susceptible to combined effects declining sea ice extent, increases open water duration, more frequent impactful storms, sea-level rise, warming permafrost.However, few observation sites have yet link decadal-scale erosion rates with changing environmental conditions due temporal data gaps.This study fidelity coastal bluff observations using near-annual high spatial resolution (<1 m)...
Low-land permafrost areas are subject to intense freeze-thaw cycles and characterized by remarkable surface displacement. We used Sentinel-1 SAR interferometry (InSAR) in order analyse the summer displacement over four spots Arctic Antarctica since 2015. Choosing floodplain or outcrop as reference for InSAR relative deformation measurements, we found maximum subsidence of about 3 10 cm during thawing season with generally high spatial variability. time-series interferograms 6–12 day time...
Thermokarst lakes are widespread in Arctic lowlands. Under a warming climate, landscapes with highly ice-rich Yedoma Ice Complex (IC) deposits particularly vulnerable, and thermokarst lake area dynamics serve as an indicator for their response to climate change. We conducted change trend analysis 44,500 km2 region of the Kolyma Lowland using Landsat imagery conjunction TanDEM-X digital elevation model Quaternary Geology map data. delineated yedoma–alas relief types different yedoma...
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. Ponds and lakes are abundant in Arctic permafrost lowlands. They play an important role wetland ecosystems by regulating carbon, water, energy fluxes providing freshwater habitats. However, ponds, i.e., waterbodies with surface areas smaller than 1. 0 × 104 m2, have not been inventoried on global regional scales. The Permafrost Region Pond Lake (PeRL) database presents the results of a circum-Arctic effort to map ponds from modern (2002–2013) high-resolution aerial satellite...
Submarine permafrost degradation has been invoked as a cause for recent observations of methane emissions from the seabed to water column and atmosphere East Siberian shelf.Sediment drilled 52 m down sea ice in Buor Khaya Bay, central Laptev Sea revealed unfrozen sediment overlying ice-bonded permafrost.Methane concentrations were low (mean 20 μM) but higher underlying submarine 380 μM).In contrast, sulfate substantially 2.5 mM) than 0.1 mM).Using deduced rates, we calculate potential mean...
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. Ice wedges in the Yana Highlands of interior Yakutia – most continental region Northern Hemisphere were investigated to elucidate changes winter climate and continentality that have taken place since Middle Pleistocene. The Batagay megaslump exposes ice composite sampled from three cryostratigraphic units: lower complex likely pre-Marine Isotope Stage (MIS) 6 age, upper (Yedoma) sand unit (both MIS 3 2). A terrace nearby Adycha River provides a Late Holocene (MIS 1) wedge serves as...
On Earth, the thawing of permafrost deposits with high‐ground ice content results in massive surface subsidence and formation characteristic large thermokarst depressions. Slope asymmetries within depressions suggest lateral growth, which occurs due to thermoerosion gravimetric mass wasting along these slopes. It has been proposed that rimless, asymmetrically shaped (called scalloped depressions) on Mars were formed by insolation‐driven ground sublimation. We investigated a depression...
Abstract. Predicting future thaw slump activity requires a sound understanding of the atmospheric drivers and geomorphic controls on mass wasting across range timescales. On sub-seasonal timescales, sparse measurements indicate that at active slumps is often limited by energy available for melting ground ice, but other factors such as rainfall or formation an insulating veneer may also be relevant. To study drivers, we derive topographic changes from single-pass radar interferometric data...
Abstract. Coastal erosion and flooding transform terrestrial landscapes into marine environments. In the Arctic, these processes inundate permafrost with seawater create submarine permafrost. Permafrost begins to warm under conditions, which can destabilize sea floor may release greenhouse gases. We report on transition of at a site where timing inundation be inferred from rate coastline retreat. On Muostakh Island in central Laptev Sea, East Siberia, changes annual position have been...
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...
Abstract. Ice-rich yedoma-dominated landscapes store considerable amounts of organic carbon (C) and nitrogen (N) are vulnerable to degradation under climate warming. We investigate the C N pools in two thermokarst-affected yedoma – on Sobo-Sise Island Bykovsky Peninsula north eastern Siberia. Soil cores up 3 m depth were collected along geomorphic gradients analysed for contents. A high vertical sampling density profiles allowed calculation stocks short soil column intervals enhanced...
Abstract Thermal erosion is a major mechanism of permafrost degradation, resulting in characteristic landforms. We inventory thermo‐erosional valleys ice‐rich coastal lowlands adjacent to the Siberian Laptev Sea based on remote sensing, Geographic Information System (GIS), and field investigations for first regional assessment their spatial distribution characteristics. Three study areas with similar geological (Yedoma Ice Complex) but diverse geomorphological conditions vary valley areal...
Abstract. Enhanced permafrost warming and increased Arctic river discharges have heightened concern about the input of terrigenous matter into coastal waters. We used optical operational satellite data from ocean colour sensor MERIS (Medium-Resolution Imaging Spectrometer) aboard ENVISAT mission for synoptic monitoring pathways on shallow Laptev Sea shelf. Despite high cloud coverage in summer that is inherent to this region, time series 2006 2011 could be acquired were processed using...
Yedoma—extremely ice-rich permafrost with massive ice wedges formed during the Late Pleistocene—is vulnerable to thawing and degradation under climate warming. Thawing of Yedoma results in lowering surface elevations. Quantitative knowledge about elevation changes helps us understand freeze-thaw processes active layer potential deposits. In this study, we use C-band Sentinel-1 InSAR measurements map over uplands on Sobo-Sise Island, Lena Delta frequent revisit observations (as short as six...