A5008819161- Geology and Paleoclimatology Research
- Geological Studies and Exploration
- Methane Hydrates and Related Phenomena
- Climate change and permafrost
- Marine and environmental studies
- Nuclear Materials and Properties
- Archaeology and ancient environmental studies
- Pleistocene-Era Hominins and Archaeology
- Thermodynamic and Structural Properties of Metals and Alloys
- Radioactive element chemistry and processing
- Fusion materials and technologies
- Ancient and Medieval Archaeology Studies
- Geological formations and processes
- Metallurgical and Alloy Processes
- Arctic and Antarctic ice dynamics
- Intermetallics and Advanced Alloy Properties
- Nuclear reactor physics and engineering
- Advanced materials and composites
- Mining and Gasification Technologies
- Material Properties and Applications
- Indigenous Studies and Ecology
- Geotechnical and Geomechanical Engineering
- Powder Metallurgy Techniques and Materials
- Metallurgical Processes and Thermodynamics
- Metal Extraction and Bioleaching
National Academy of Sciences of Armenia
2024
Institute of Botany
2024
St Petersburg University
2013-2022
Arctic and Antarctic Research Institute
2011-2022
National University of Science and Technology
2018-2021
Lund University
2008
Abstract During the last glacial–interglacial cycle, Arctic biotas experienced substantial climatic changes, yet nature, extent and rate of their responses are not fully understood 1–8 . Here we report a large-scale environmental DNA metagenomic study ancient plant mammal communities, analysing 535 permafrost lake sediment samples from across spanning past 50,000 years. Furthermore, present 1,541 contemporary genome assemblies that were generated as reference sequences. Our provides several...
<strong class="journal-contentHeaderColor">Abstract.</strong> Between October 2008 and May 2009, the International Continental Scientific Drilling Program (ICDP) co-sponsored a campaign at Lake El´gygytgyn, located in 3.6-Ma-old meteorite impact crater northeastern Siberia. targets included three holes center of 170-m-deep lake, utilizing lake ice cover as drilling platform, plus one hole close to shore western catchment. At lake's center. entire 315-m-thick sediment succession was...
Between October 2008 and May 2009, the International Continental Scientific Drilling Program (ICDP) co-sponsored a campaign at Lake El´gygytgyn, located in 3.6-Ma-old meteorite impact crater northeastern Siberia. targets included three holes center of 170-m-deep lake, utilizing lake ice cover as drilling platform, plus one hole close to shore western catchment. At lake’s center. entire 315-m-thick sediment succession was penetrated. The sediments lack any hiatuses (i.e., no evidence basin...
Lake Ladoga in northwestern Russia is Europe's largest lake. The postglacial history of the basin for first time documented continuously with high temporal resolution upper 13.3 m a sediment core (Co1309) from part We applied multiproxy approach including radiographic imaging, (bio‐)geochemical and granulometric analyses. Age control was established combining radiocarbon dating varve chronology, latter anchored to correlated age lake close by. age‐depth model reveals onset glacial...
Abstract An accumulation terrace close to the El'gygytgyn Impact Crater in northeastern Siberia contains stratigraphic and periglacial evidence of paleoenvironmental paleoclimatic history permafrost dynamics during late Quaternary time. A succession paleo active-layer deposits that mirror environmental changes records periods favorable for establishment growth ice-wedge polygonal networks sediment variations. These two elements landscape serve as complementary archives can be traced back ∼...
Abstract. Frozen sediments from three cores bored in the permafrost surrounding El'gygytgyn Impact Crater Lake have been studied for pollen, non-pollen palynomorphs, plant macrofossils and rhizopods. The palynological study of these contributes to a higher resolution time intervals presented poor temporal lacustrine sediments; namely Allerød succeeding periods. Moreover, records better reflect local environmental changes, allowing more reliable reconstruction paleoenvironments. new data...
A multi‐channel, high‐resolution seismic reflection survey using a Micro‐ GI airgun was carried out in the framework of Russian‐German project PLOT (Paleolimnological Transect) on Lake Levinson‐Lessing, Taymyr Peninsula, 2016. In total, ~70 km profiles revealed unprecedented detail glacial and postglacial sedimentary infill lake basin. Five main units have been recognized interpreted as (Unit V), subglacial proglacial IV ), marine III fluvial‐lacustrine II ) lacustrine I) sediments. Of...
The sediment succession of Lake Emanda in the Yana Highlands was investigated to reconstruct regional late Quaternary climate and environmental history. Hydro‐acoustic data obtained during a field campaign 2017 show laminated sediments north‐western deepest (up ̃15 m) part lake, where ̃6‐m‐long core (Co1412) retrieved. studied with multi‐proxy approach including sedimentological geochemical analyses. chronology Co1412 is based on 14 C AMS dating plant fragments from upper 4.65 m by...
Lake Ladoga hosts preglacial sediments, although the Eurasian ice sheet overrode area during LGM . These sediments were first discovered by a seismic survey and are investigated using 22.75‐m‐long core. Its upper 13.30 m comprise Holocene Lateglacial separated from lower 11.45 of hiatus. They consist highly terrigenous lacustrine which according to OSL dating, deposited an early stage last age ( MIS 5). The palynological data allow reconstruction Early Weichselian environmental history for...
Late Quaternary sediments in a permafrost environment recovered from the Elgygytgyn Impact Crater were studied to determine regional palaeoenvironmental variability and infer past water‐level changes of crater lake. Stratigraphic analysis 5 m long core is based on various lithological (grain size, total organic carbon, magnetic susceptibility) hydrochemical (oxygen isotope composition, major cation content) properties pore ice content. The results show that alluvial accumulated top...
Abstract Lake El'gygytgyn is situated in a 3.6 Ma old impact crater northeastern Siberia. Presented here reconstruction of the Quaternary lake-level history as derived from sediment cores southern lake shelf. There, cliff-like bench 10 m below modern water level has been investigated. Deep-water sediments on shelf indicate high levels during warm Mid-Pleistocene period. One period with low prior to Marine Oxygen Isotope Stage (MIS) 3 identified, followed by (10 above present). In course MIS...
The new pollen record from the upper 12.75 m of a sediment core obtained in Lake Ladoga documents regional vegetation and climate changes northwestern Russia over last 13.9 cal. ka. Lateglacial chronostratigraphy is based on varve chronology, while Holocene stratigraphy AMS 14 C OSL dates, supported by comparison with records. During ( c . 13.9–11.2 ka BP ), region experienced several climatic fluctuations as reflected changes. Shrub grass communities dominated between 13.2 increase Picea at...
Bolshaya Imandra, the northern sub‐basin of Lake was investigated by a hydro‐acoustic survey followed sediment coring down to acoustic basement. The record analysed combined physical, biogeochemical, sedimentological, granulometrical and micropalaeontological approach reconstruct regional climatic environmental history. Chronological control obtained 14 C dating, 137 Cs, Hg markers as well pollen stratigraphy revealed that succession offers first continuous spanning Lateglacial Holocene for...
Abstract. Modern process studies of the hydrologic balance Lake El'gygytgyn, central Chukotka, and sediment income from catchment were carried out during a field campaign in spring summer 2003. Despite high uncertainties due to limited data, results provide important first estimates for better understanding modern past sedimentation processes this basin. Formed ca. 3.6 million years ago as result meteorite impact, basin contains one longest paleoclimate records terrestrial Arctic. Fluvial...
Abstract. Modern process studies of the hydrologic balance and sediment flux into out Lake El'gygytgyn, central Chukotka, provide important quantitative estimates for better understanding lacustrine paleoclimate record from this basin. Formed ca. 3.6 Ma as a result meteorite impact, basin contains one longest records in Arctic. Fluvial activity today is concentrated over short snowmelt period. Recent lake-level changes have slow regressive character due to active underground runoff, even...
ABSTRACT The 45.95 m‐long sediment succession shown in core Co1401 from Lake Levinson‐Lessing allows the reconstruction of largely unexplored environmental and climatic history Taymyr Peninsula past 62 kyr. was analysed with a multidisciplinary approach including lithological, granulometric, geochemical pollen analyses. proxy data indicate relatively stable, herb‐dominated environment only subtle changes between cold/wet late Marine Isotope Stage (MIS) 4 early MIS 3, mild/dry middle 3...
ABSTRACT Because continuous and high‐resolution records are scarce in the polar Urals, a multiproxy study was carried out on 54 m long sediment succession (Co1321) from Lake Bolshoye Shchuchye. The sedimentological, geochemical, pollen chironomid data suggest that glaciers occupied lake's catchment during cold dry MIS 2 document change ice extent around 23.5–18 cal ka bp. Subsequently, meltwater input, supply erosional activity decreased as local progressively melted. vegetation lake...
Quaternary glacial stratigraphy and relative sea-level changes reveal at least two expansions over the Chelyuskin Peninsula, bordering Kara Sea about 77°N in Russian Arctic, as indicated from tills interbedded with marine sediments, exposed stratigraphic superposition, raisedbeach sequences mapped to altitudes of up ca. 80 m a.s.l. Chronological control is provided by accelerator mass spectrometry 14C dating, electron-spin resonance optically stimulated luminescence geochronology. Major...
Abstract. The combination of permafrost history and dynamics, lake level changes the tectonical framework is considered to play a crucial role for sediment delivery El'gygytgyn Crater Lake, NE Russian Arctic. purpose this study propose depositional based on analyses core strata from margin historical reconstructions various studies at site. A sedimentological program has been conducted using frozen samples 141.5 m long 5011-3 well. drill site located in sedimentary west that partly fills...