A5078697020- Climate change and permafrost
- Methane Hydrates and Related Phenomena
- Geological Studies and Exploration
- Cryospheric studies and observations
- Geology and Paleoclimatology Research
- Arctic and Antarctic ice dynamics
- Peatlands and Wetlands Ecology
- Marine and environmental studies
- Soil and Environmental Studies
- Icing and De-icing Technologies
- Toxic Organic Pollutants Impact
- Atmospheric and Environmental Gas Dynamics
- Hydrocarbon exploration and reservoir analysis
- Indigenous Studies and Ecology
- Arctic and Russian Policy Studies
- Radioactivity and Radon Measurements
- Material Properties and Applications
- Freezing and Crystallization Processes
- Coal and Coke Industries Research
Melnikov Permafrost Institute of the Siberian Branch of the Russian Academy of Science
2020-2024
Russian Academy of Sciences
2021-2024
Earth Cryosphere Institute
2017-2020
Abstract Ulakhan Sular provides one of the largest natural stratigraphic sections through ancient permafrost deposits in Batagay–Betenkes region Yana Uplands western Beringia, but their depositional environment, age, and paleoenvironmental significance are uncertain. To address these uncertainties, we report results reconnaissance observations stratigraphy, sedimentology, paleosols soil-like bodies, plant insect macrofossils, geochronology at stratotype section Formation. Sedimentologically,...
ABSTRACT Climatic and environmental change is leading to increased frequency intensity of permafrost degradation processes; however, our knowledge their mechanisms rate still limited. We examined structure deposits, surface topography, weather conditions during the initiation a thermo‐erosion gully in eastern Siberia monitored its changes between 2020 2022. The was caused by combination processes: (1) catchment area artificially several decades ago as result interception runoff winter road;...
Structure of arctic peatlands with massive ice and structure-forming were studied in drained lake («khasyrey») the Pur-Taz interfluves (the north West Siberia). The period accumulation two-meter thickness peat was established to be changed from 8413±90 897±90 years BP. Composition deposits is represented by Betula nana, Sphagnum sp., Vaccinium oxycoccos, Eriophorum Equisetum sp. wedges large shoulders young wedges. central part wedge composed recrystallized crystals veins. Melting zones...
Abstract Heterogeneous ice wedges were studied within the peatland of drained lake on Pur‐Taz interfluve (67°20′14.8″, 078°55′47.1″, Northwest Siberia). The elements ice‐wedge structure identified: young wedge, shoulders, selvages, closed‐cavity ices, and lenses in a peatland. Different genetic types (ice vein, congelation ice, segregated ice) revealed by analyzing under polarized light their chemical compositions. Genetic indicate different mechanisms formation. vein forms due to fast...
The advantages and limitations of the petrography method relevance its use for study natural ice are reviewed in present work. petrographic ground is often used solving paleogeographic issues. petrofabric analysis not only useful descriptive purposes but, like cryostructures, helps to infer growth processes conditions. Different types have specific features that can help us determine genesis. Surface ice, such as glacier presented by foliation formed large crystals (50-60 mm); lake...
The Late Holocene ground ices are occurred due to freeze cracking, slope, thermocast, thermoerosion pro‑ cesses. New formation ice within may intervene the Pleistocene, lower and perma‑ frost can really complicate their structure. Relationship between seasonal perennial new of with massive permafrost was studied in cross section North Western Siberia. features texture structure formed thawing cavities, some cracks were determined. differences late early Pleistocene defined. depend cavity...
The syngenetic ice and ice-ground composite veins in khasyrey (alas) interalas plateaus were studied on the second lake-alluvial terrace located North of Gydan Peninsula near village Gyda. On basis radiocarbon dating, time formation deposits containing from was established – 16 640 to 854 BP. peat are mainly represented by following species: Carex sp., Eriophorum Betula nana, Equisetum Calamagrostis Vaccinium vitis-idaea, Drepanocladus Empetrum uliginosum, Rubus arcticus, Petasites sp. It is...
In 2016-2017, we have detected numerous organic frost boils on the surface of khasyrey peat plateau in southern tundra part Pur-Taz interfluve (the north West Siberia). They are related to microrelief depressions polygons and swales between tussocks. Cross-sections, cryogenic structure, properties active layer (moisture, density, heaving, chemical composition) distribution within khasyreys were studied. layer, distinguished soil vegetation cover, upper middle solid layers weakly decomposed...
Studies of the dependence accumulation stable carbon isotopes on growing conditions in modern plant species tundra are very relevant. It was discovered that same accumulate 13C isotope different ways. The goal this work is to reveal relationship between content plants and natural typical terrains Western Yamal. At geocryological station Marre-Sale, were selected grow under moisture remoteness from sea. Modern determined using determinant atlases, contents a DELTA V Advantage mass...
The study of underground ice and frozen soils on the north Gydan Peninsula was made in 2016. article is devoted to results study. granulometric geochemical composition deposits, hydrochemical were determined. interrelation between genesis ice, with accumulation freezing conditions deposits identified.
The concentration of main organic and inorganic pollutants (heavy metals, polyaromatic hydrocarbons, radionuclides) in surface waters water-soil solutions was analysed on three keysites within the permafrost zone: Tazovsky Peninsula (North-West Siberia), Kolyma Lowland (North Yakutia) adjacent to Yakutsk (Central Yakutia). In majority sampling points that are not directly impacted by human activity, accumulate uppermost organogenic organo-mineral horizons natural soils. At human-affected...
Results of the study samples offshore deposits Kara Sea, taken during VNII Okeangeologia expedition in 2007 are considered this article. Particle size analysis performed by laser diffraction. Mineralogical was X-ray. The triangular diagram particle distribution composition, dynamogenetic and genetic facies for determine transportation routes clastic particles have been built interpretation data, on which lithogenetic types were identified.
In the structure of frozen thickness 2nd lake-alluvial terrace Gyda River were detected polygonal-wedge, lens massive and lensoid ice were. A detailed analysis structural textural peculiarities in layers was carried out for first time these morphological types underground ice. Based on cryolithological host rocks structural-textural features ice, main mechanisms deposit formation – infiltration-segregational, congelation determined. The development polygonal-wedge occurred an...