A5019395790- Methane Hydrates and Related Phenomena
- Climate change and permafrost
- Geological Studies and Exploration
- Arctic and Antarctic ice dynamics
- Marine and environmental studies
- Cryospheric studies and observations
- Geology and Paleoclimatology Research
- Indigenous Studies and Ecology
- Arctic and Russian Policy Studies
- Aquatic and Environmental Studies
- Food Industry and Aquatic Biology
- Atmospheric and Environmental Gas Dynamics
- Winter Sports Injuries and Performance
- Hydrocarbon exploration and reservoir analysis
- Oceanographic and Atmospheric Processes
- Polar Research and Ecology
- Ecology and biodiversity studies
- Seismic Imaging and Inversion Techniques
- Coastal and Marine Dynamics
- Outsourcing and Supply Chain Management
- Enterprise Management and Information Systems
- Law, logistics, and international trade
- Transport and Logistics Innovations
- Maritime and Coastal Archaeology
- Economic and Technological Systems Analysis
Melnikov Permafrost Institute of the Siberian Branch of the Russian Academy of Science
2015-2024
Russian Academy of Sciences
2013-2024
Kurchatov Institute
2020-2024
Central Research Institute of Structural Materials Prometey
2020-2024
Siberian Branch of the Russian Academy of Sciences
2018-2023
Institute of Petroleum Geology and Geophysics
2019-2020
North-Eastern Federal University
2020
Baltic State Technical University Voenmeh
2019
Chuvash State University
2019
University of Bremen
2008
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...
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. Samoylov Island is centrally located within the Lena River Delta at 72° N, 126° E and lies Siberian zone of continuous permafrost. The landscape on consists mainly late Holocene river terraces with polygonal tundra, ponds lakes, an active floodplain. island has been focus numerous multidisciplinary studies since 1993, which have focused climate, land cover, ecology, hydrology, permafrost limnology. This paper aims to provide a framework for future by describing characteristics...
Abstract. Most of the world's permafrost is located in Arctic, where its frozen organic carbon content makes it a potentially important influence on global climate system. The Arctic appears to be changing more rapidly than lower latitudes, but observational data density region low. Permafrost thaw and release into atmosphere, as well snow cover changes, are positive feedback mechanisms that have potential for warming. It therefore particularly understand links between energy balance, which...
[1] Summer hydrographic data (1920–2009) show a dramatic warming of the bottom water layer over eastern Siberian shelf coastal zone (<10 m depth), since mid-1980s, by 2.1°C. We attribute this to changes in Arctic atmosphere. The enhanced summer cyclonicity results warmer air temperatures and reduction ice extent, mainly through thermodynamic melting. This leads lengthening open-water season more solar heating column. permafrost modeling indicates, however, that significant change depth lags...
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...
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...
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...
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...
Thawing submarine permafrost is a source of methane to the subsurface biosphere. Methane oxidation in sediments has been proposed, but responsible microorganisms remain uncharacterized. We analyzed archaeal communities and identified distinct anaerobic methanotrophic assemblages marine terrestrial origin (ANME-2a/b, ANME-2d) both frozen completely thawed sediments. Besides archaea potentially involved (AOM) we found large diversity mainly belonging Bathyarchaeota, Thaumarchaeota,...
Abstract Submarine permafrost is perennially cryotic earth material that lies offshore. Most submarine relict terrestrial beneath the Arctic shelf seas, was inundated after last glaciation, and has been warming thawing ever since. As a reservoir confining layer for gas hydrates, it potential to release greenhouse gasses impact coastal infrastructure, but its distribution rate of thaw are poorly constrained by observational data. Lengthening summers, reduced sea ice extent increased solar...
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...
Thawing of subsea permafrost can impact offshore infrastructure, affect coastal erosion, and release organic matter. is usually modeled as the result heat transfer, although salt diffusion may play an important role in marine settings. To better quantify nearshore thawing, we applied CryoGRID2 model coupled it to a model. We simulated coastline retreat evolution develops through successive stages thawing sequence at Bykovsky Peninsula, Siberia. Sensitivity analyses for seawater salinity were...
Abstract Arctic coastal erosion experiences pronounced effects from ongoing climate change. The Laptev Sea figures among the regions with most severe rates. Here, we use unprecedentedly long records of almost 30 years annual in‐situ rate measurements Bykovsky Peninsula and Muostakh Island to separate main modes variability, which attribute large‐scale drivers. first (lower‐frequency) second (higher‐frequency) are associated winter sea‐ice cover in Oscillation, respectively, together account...
Ice complexes (ICs) formed during the Late Pleistocene regression (marine isotope stages 5–3) on drained Laptev Sea shelf and coastal lowlands. These sediments can be several dozen metres thick (up to 40–60 m). Over wide areas lower boundary of ICs is situated below current sea level. At about 13 ka BP thermokarst processes began destroy ICs, both Thermokarst lakes depressions (alasses) were 11–11.5 9.5–8.5 when shoreline position lay isobaths −60 −45 m. Lakes alasses became traps for via IC...
Models and geophysical data indicate that large areas of the Arctic shelves, as a result their exposure during Last Glacial Maximum, are thought to be almost entirely underlain by subsea permafrost from coastline down water depth about 100 meters. Subsea is still poorly understood, due mainly lack direct observations. However, it known contain gas hydrates, solid phase composed gases formed under low‐temperature, high‐pressure conditions. Large volumes methane in hydrate form can stored...
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...
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...