A5012298195- Methane Hydrates and Related Phenomena
- Atmospheric and Environmental Gas Dynamics
- Climate change and permafrost
- Geological Studies and Exploration
- Arctic and Antarctic ice dynamics
- Geology and Paleoclimatology Research
- Hydrocarbon exploration and reservoir analysis
- Marine and coastal ecosystems
- Ocean Acidification Effects and Responses
- Marine and environmental studies
- Climate Change and Environmental Impact
- Isotope Analysis in Ecology
- Atmospheric chemistry and aerosols
- Arctic and Russian Policy Studies
- Aquatic and Environmental Studies
- Atmospheric Ozone and Climate
- Microbial Community Ecology and Physiology
- Laser Applications in Dentistry and Medicine
- Economic and Technological Systems Analysis
- Photoacoustic and Ultrasonic Imaging
- Indigenous Studies and Ecology
- Optical Coherence Tomography Applications
- Radioactive contamination and transfer
- Water Quality Monitoring and Analysis
- Water Resources and Management
V.I. Il'ichev Pacific Oceanological Institute
2010-2024
Institute of Geosphere Dynamics
2023-2024
National Research Tomsk State University
2015-2024
Far Eastern Branch of the Russian Academy of Sciences
2005-2023
Lomonosov Moscow State University
2020-2023
University of Alaska Fairbanks
2014-2023
National Research University Higher School of Economics
2021-2023
Russian Academy of Sciences
2007-2022
Tomsk Polytechnic University
2014-2021
International Arctic Research Center
2007-2020
Bubble, Warming and Trouble Vast quantities of methane are stored in ocean sediments, mostly the form clathrates, but is also trapped submerged terrestrial permafrost that was flooded during last deglaciation. There thus concern climate warming could warm waters enough to release cryogenically beneath seabed, causing even more warming. Shakova et al. (p. 1246 ; see Perspective by Heimann ) report than 80% bottom water, 50% surface over East Siberian Arctic Shelf, indeed supersaturated with...
Sustained release of methane (CH(4)) to the atmosphere from thawing Arctic permafrost may be a positive and significant feedback climate warming. Atmospheric venting CH(4) East Siberian Shelf (ESAS) was recently reported on par with flux tundra; however, future scale these releases remains unclear. Here, based results our latest observations, we show that emissions this shelf are likely determined by state subsea degradation. We observed two previously understudied areas ESAS: outer shelf,...
Abstract The rates of subsea permafrost degradation and occurrence gas-migration pathways are key factors controlling the East Siberian Arctic Shelf (ESAS) methane (CH 4 ) emissions, yet these still require assessment. It is thought that after inundation, permafrost-degradation would decrease over time submerged thaw-lake taliks freeze; therefore, no CH release occur for millennia. Here we present results first comprehensive scientific re-drilling to show in near-shore zone ESAS has a...
The East Siberian Arctic Shelf (ESAS), which includes the Laptev Sea, and Russian part of Chukchi has not been considered to be a methane (CH 4 ) source hydrosphere or atmosphere because subsea permafrost, underlies most ESAS, was believed, first, conducive methanogenesis and, second, act as an impermeable lid, preventing CH escape through seabed. Here recent observational data obtained during summer (2005–2006) winter (2007) expeditions indicate ubiquitous presence elevated dissolved...
Abstract. The Lena River integrates biogeochemical signals from its vast drainage basin, and the integrated signal reaches far out over Arctic Ocean. Transformation of riverine organic carbon (OC) into mineral carbon, form in watershed, can be considered to quasi-steady-state processes. An increase discharge exerts opposite effects on total (TOC) inorganic (TCO2) carbon: TOC concentration increases, while TCO2 decreases. Significant inter-annual variability mean values TCO2, TOC, their sum...
This paper summarizes current understanding of the processes that determine dynamics subsea permafrost–hydrate system existing in largest, shallowest shelf Arctic Ocean; East Siberian Shelf (ESAS). We review key environmental factors and mechanisms formation, dynamics, thermal state permafrost, its destabilization, rates thawing; a full section this is devoted to topic. Another important question regards possible existence permafrost-related hydrates at shallow ground depth environment....
Significance A successful mitigation strategy for climate warming agents such as black carbon (BC) requires reliable source information from bottom-up emission inventory data, which can only be verified by observation. We measured BC in one of the fastest-warming and, at same time, substantially understudied regions on our planet, northeastern Siberian Arctic. Our observations, compared with an atmospheric transport model, imply that quantification and spatial allocation emissions high...
Abstract. Shelf seas are among the most active biogeochemical marine environments and East Siberian Sea is a prime example. This sea supplied by seawater from both Atlantic Pacific Oceans has substantial input of river runoff. All these waters contribute chemical constituents, dissolved particulate, but different signatures. ice formation during winter season melting in summer major impact on physical as well conditions. The internal circulation water mass distribution significantly...
Isotopes pinpoint strong seasonal variations in black carbon sources with consistent patterns at sites around the Arctic.
Models of sub‐sea permafrost evolution vary significantly in employed physical assumptions regarding the paleo‐geographic scenario, geological structure, thermal properties, initial temperature distribution, and geothermal heat flux. This work aims to review underlying these models as well incorporate recent findings, hence develop an up‐to‐date model dynamics at Laptev Sea shelf. In particular, developed here incorporates thermokarst land‐ocean interaction theory, shows that sediment...
Significance Extensive release of methane from sediments the world’s largest continental shelf, East Siberian Arctic Ocean (ESAO), is one few Earth system processes that can cause a net transfer carbon land/ocean to atmosphere and thus amplify global warming on timescale this century. An important gap in our current knowledge concerns contributions different subsea pools observed releases. This prerequisite robust predictions how these releases will develop future. Triple-isotope–based...
Abstract The rapidly changing East Siberian Arctic Shelf (ESAS) receives large amounts of terrestrial organic carbon (OC) from coastal erosion and Russian‐Arctic rivers. Climate warming increases thawing Ice Complex Deposits (ICD) can change both the amount released OC, as well its propensity to be converted greenhouse gases (fueling further global warming) or buried in sediments. This study aimed unravel susceptibility degradation, transport dispersal patterns OC delivered ESAS. Bulk...
This review paper summarizes current understanding of the transport organic carbon to, and fate within, East Siberian Arctic Shelf (ESAS), processes determining dioxide (CO2) methane (CH4) fluxes from ESAS to atmosphere achieved analyzing data sets obtained on 20 expeditions performed 1999 2011. study was aimed at investigating how redistribution old degrading terrestrial sub-sea permafrost coastal erosion contributes pool ESAS, changes in hydrological cycle surrounding land alteration...
Abstract. The Arctic Ocean, especially the East Siberian Shelf (ESAS), has been proposed as a significant source of methane that might play an increasingly important role in future. However, underlying processes formation, removal and transport associated with such emissions are to date strongly debated. CH4 concentration triple isotope composition were analyzed on gas extracted from sediment water sampled at numerous locations shallow ESAS 2007 2013. We find high concentrations (up 500 µM)...
Abstract. The East Siberian Arctic Shelf (ESAS) is the broadest and shallowest continental shelf in world. It characterized by both highest rate of coastal erosion world a large riverine input terrigenous dissolved organic matter (DOM). DOM plays significant role marine aquatic ecosystems. chromophoric fraction (CDOM) directly affects quantity spectral quality available light, thereby impacting primary production ultraviolet (UV) exposure A multiyear study CDOM absorption, fluorescence,...
Abstract. Biogeochemical cycling in the semi-enclosed Arctic Ocean is strongly influenced by land–ocean transport of carbon and other elements vulnerable to environmental climate changes. Sediments are an important part biogeochemical provide opportunity study present historical input fate organic matter (e.g., through permafrost thawing). Comprehensive sedimentary records required compare differences between regions budgets. To this end, Circum-Arctic Sediment CArbon DatabasE (CASCADE) was...
Abstract Subsea permafrost represents a large carbon pool that might be or become significant greenhouse gas source. Scarcity of observational data causes uncertainties. We here use five 21-56 m long subsea cores from the Laptev Sea to constrain organic (OC) storage and sources, degradation state potential production upon thaw. Grain sizes, optically-stimulated luminescence biomarkers suggest deposition aeolian silt fluvial sand over 160 000 years, with dominant fluvial/alluvial forest-...
Abstract. This study aims to improve understanding of carbon cycling in the Buor-Khaya Bay (BKB) and adjacent part Laptev Sea by studying inter-annual, seasonal, meso-scale variability related hydrological biogeochemical parameters water, as well factors controlling dioxide (CO2) emission. Here we present data sets obtained on summer cruises winter expeditions during 12 yr investigation. Based analysis, suggest that heterotrophic BKB area, input terrestrially borne organic (OC) varies...
Abstract. Sonar surveys provide an effective mechanism for mapping seabed methane flux emissions, with Arctic submerged permafrost seepage having great potential to significantly affect climate. We created in situ engineered bubble plumes from 40 m depth fluxes spanning 0.019 1.1 L s−1 derive the calibration curve (Q(σ)). These nonlinear curves related (Q) sonar return (σ) a multibeam echosounder (MBES) and single-beam (SBES) range of depths. The analysis demonstrated significant multiple...