A5004305973- Methane Hydrates and Related Phenomena
- Geological Studies and Exploration
- Arctic and Antarctic ice dynamics
- Atmospheric and Environmental Gas Dynamics
- Climate change and permafrost
- Geology and Paleoclimatology Research
- Marine and coastal ecosystems
- Marine and environmental studies
- Hydrocarbon exploration and reservoir analysis
- Arctic and Russian Policy Studies
- Oceanographic and Atmospheric Processes
- Isotope Analysis in Ecology
- Food Industry and Aquatic Biology
- Microbial Community Ecology and Physiology
- Ocean Acidification Effects and Responses
- Cryospheric studies and observations
- Aquatic and Environmental Studies
- Indigenous Studies and Ecology
- Seismic Waves and Analysis
- Geochemistry and Elemental Analysis
- Mercury impact and mitigation studies
- Atmospheric chemistry and aerosols
- Peatlands and Wetlands Ecology
- Toxic Organic Pollutants Impact
- Marine Biology and Ecology Research
V.I. Il'ichev Pacific Oceanological Institute
2016-2025
Russian Academy of Sciences
2016-2025
National Research Tomsk State University
2016-2025
Lomonosov Moscow State University
2021-2025
Far Eastern Branch of the Russian Academy of Sciences
2016-2025
Sakhalin State University
2024-2025
Tomsk Polytechnic University
2015-2024
University of Alaska Fairbanks
2015-2024
National Research University Higher School of Economics
2020-2024
International Arctic Research Center
2013-2022
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...
Bathymetry (seafloor depth), is a critical parameter providing the geospatial context for multitude of marine scientific studies. Since 1997, International Bathymetric Chart Arctic Ocean (IBCAO) has been authoritative source bathymetry Ocean. IBCAO merged its efforts with Nippon Foundation-GEBCO-Seabed 2030 Project, goal mapping all oceans by 2030. Here we present latest version (IBCAO Ver. 4.0), more than twice resolution (200 × 200 m versus 500 m) and individual depth soundings...
Mobilization of Arctic permafrost carbon is expected to increase with warming-induced thawing. However, this effect challenging assess due the diverse processes controlling release various organic (OC) pools from heterogeneous landscapes. Here, by radiocarbon dating terrestrial OC components in fluvially and coastally integrated estuarine sediments, we present a unique framework for deconvoluting contrasting mobilization mechanisms surface vs. deep (permafrost) across climosequence Eurasian...
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 hypothesis of a km-thick ice shelf covering the entire Arctic Ocean during peak glacial conditions was proposed nearly half century ago. Floating shelves preserve few direct traces after their disappearance, making reconstructions difficult. Seafloor imprints should, however, exist where grounded along flow paths. Here we present new evidence ice-shelf groundings on bathymetric highs in central Ocean, resurrecting concept an extending over at least one previous age. New and previously...
Abstract Plastic pollution is globally recognised as a threat to marine ecosystems, habitats, and wildlife, it has now reached remote locations such the Arctic Ocean. Nevertheless, distribution of microplastics in Eurasian particularly underreported. Here we present analyses 60 subsurface pump water samples 48 surface neuston net from with goal quantify classify relation oceanographic conditions. In our study area, found on average 0.004 items per m 3 samples, 0.8 samples. Microplastic...
The sizes of major sources and sinks atmospheric methane (CH 4 ), an important greenhouse gas, are poorly known. CH from north Siberian lakes contributes ∼1.5 teragrams year −1 to observed winter increases in concentration at high northern latitudes. emitted these had a radiocarbon age 27,200 years was derived largely Pleistocene-aged carbon.
Surface sediments were collected during the 2000 TransArctic Expedition along Siberian Arctic coastline, including Ob, Yenisey, Khatanga, Lena, and Indigirka estuaries. Sediments characterized for elemental composition (total organic carbon, TOC, black BC, total N, as well major trace elements), isotopic signature (δ 13 C, δ 15 Δ 14 ε Nd , 87 Sr/ 86 Sr), molecular to better understand river export variations over large spatial scale of Arctic. On average, 79 ± 9% C in was while 21 inorganic....
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...
Climate change is expected to have a strong effect on the Eastern Siberian Arctic Shelf (ESAS) region, which includes 40% of shelves and comprises Laptev East seas. The largest organic carbon pool, dissolved (DOC), may significantly due changes in both riverine inputs transformation rates; however, present DOC inventories patterns are poorly understood. Using samples from International Study 2008, this study examines for first time removal shelf waters with residence times that range months...
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....
The Siberian shelf seas cover large shallow areas that receive substantial amounts of river discharge. runoff contributes nutrients promote marine primary production, but also dissolved and particulate organic matter. coastal regions are built up matter in permafrost thaws result erosion addition to the sea. Hence there multiple sources through microbial decomposition high partial pressures CO 2 seas. By evaluating data collected from Laptev East Seas summer 2008 we compute an excess DIC...
Abstract. Climate warming in northeastern Siberia may induce thaw-mobilization of the organic carbon (OC) now held permafrost. This study investigated composition terrestrial OC exported to Arctic coastal waters both obtain a natural integration permafrost release and further understand fate released extensive Siberian Shelf Seas. Application variety elemental, molecular isotopic (δ13C Δ14C) analyses surface water suspended particulate matter underlying sediments along 500 km transect from...
The burial of terrestrial organic carbon (terrOC) in marine sediments contributes to the regulation atmospheric CO2 on geological timescales and may mitigate positive feedback present-day climate warming. However, fate terrOC settings is debated, with uncertainties regarding its degradation during transport. Here, we employ compound-specific radiocarbon analyses biomarkers determine cross-shelf transport times. For World's largest marginal sea, East Siberian Arctic shelf, requires 3600 ± 300...
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...
Abstract. Over decadal-centennial timescales, only a few mechanisms in the carbon-climate system could cause massive net redistribution of carbon from land and ocean systems to atmosphere response climate warming. The largest such climate-vulnerable pool is old organic (OC) stored Arctic permafrost (perennially frozen) soils. Climate warming, both predicted now observed be strongest globally Eurasian Alaska, causes thaw-release local tundra sites. However, central challenge for assessment...