A5048134394- Climate change and permafrost
- Geology and Paleoclimatology Research
- Methane Hydrates and Related Phenomena
- Geological Studies and Exploration
- Cryospheric studies and observations
- Marine and environmental studies
- Indigenous Studies and Ecology
- Arctic and Antarctic ice dynamics
- Hydrocarbon exploration and reservoir analysis
- Geophysical Methods and Applications
- Environmental DNA in Biodiversity Studies
- Microbial Community Ecology and Physiology
- Geological formations and processes
- Polar Research and Ecology
- Pleistocene-Era Hominins and Archaeology
- Arctic and Russian Policy Studies
- Archaeology and ancient environmental studies
- Aeolian processes and effects
- Landslides and related hazards
- Genetics and Neurodevelopmental Disorders
- Cardiac Ischemia and Reperfusion
- Winter Sports Injuries and Performance
- Planetary Science and Exploration
- Food Industry and Aquatic Biology
- Geotechnical and Geomechanical Engineering
Istanbul Technical University
2020-2024
Eberswalde University for Sustainable Development
2024
Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung
2012-2023
Freie Universität Berlin
2019
Ice-rich Pleistocene-age permafrost is particularly vulnerable to rapid thaw, which may quickly expose a large pool of sedimentary organic matter (OM) microbial degradation and lead emissions climate-sensitive greenhouse gases. Protective physico-chemical mechanisms may, however, restrict accessibility reduce OM decomposition; that be influenced by changing environmental conditions during sediment deposition. Here we study different fractions in Siberian deposited colder warmer periods the...
Permafrost deposits were studied along the Olenyeksky and Arinsky distributaries in western Lena delta using a multidisciplinary approach that included sedimentological, mineralogical, stable-isotope, paleoecological analyses order to reconstruct Late Quaternary landscape environmental history of this Northeast
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...
ABSTRACT The relationships between thermokarst activity, limnogeological processes and climate change in the Siberian Arctic are not well understood. objective of this paper is to identify factors controlling patterns deposition, using grain size distribution, organic content, elemental composition mineralogical a 137‐cm long sediment core with maximum age ~ 10.9 cal. kyr BP from Lake El'gene‐Kyuele tundra northeastern Siberia. Eight fine sand layers attributed depositional events associated...
Abstract. Organic matter deposited in ancient, ice-rich permafrost sediments is vulnerable to climate change and may contribute the future release of greenhouse gases; it thus important get a better characterization plant organic within such sediments. From Late Quaternary sediment core from Buor Khaya Peninsula, we analysed plant-derived sedimentary ancient DNA (sedaDNA) identify taxonomic composition matter, undertook palynological analysis assess environmental conditions during...
Abstract. Rapidly changing climate in the Northern Hemisphere and associated socio-economic impacts require reliable understanding of lake systems as important freshwater resources sensitive sentinels environmental change. To better understand time-series data sediment cores, it is necessary to gain information on within-lake spatial variabilities indicator data. Therefore, we retrieved a set 38 samples from surface along habitat gradients boreal, deep, yet pristine Lake Bolshoe Toko...
Abstract High‐resolution seismic and ground‐penetrating‐radar (GPR) data have been acquired over Lake Nikolay in the western Lena Delta order to study uppermost basin fill bordering frozen margins. GPR (100 MHz antenna pair) measurements were completed on lake its permafrost margins, while high‐resolution from during open‐water conditions summer using a 1.5–11.5 kHz Chirp profiler. The combined use of two profiling systems allows stratigraphic both unfrozen parts lake. Shallow reflection...
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 ∼...
The object of this study is to test the assumption that cryogenic weathering (here understood as in‐situ disintegration rock under cold‐climate conditions including ice a agent) preferentially breaks up quartz grains. We apply results laboratory tests Quaternary sediment record. combination silt production, relative enrichment in fraction, and grain micromorphology traced multi‐100‐kyr lake archive indicator data for weathering. Constant are inferred at least last 220-000 years from core...
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...
Abstract. Permafrost is a sensitive element of the cryosphere, but operational monitoring ground thermal conditions on large spatial scales still lacking. Here, we demonstrate remote-sensing-based scheme that capable estimating transient evolution temperatures and active layer thickness by means model CryoGrid 2. The applied to an area approximately 16 000 km2 in Lena River delta (LRD) NE Siberia for period 14 years. forcing data sets at 1 km weekly temporal resolution are synthesized from...
Ecosystem boundaries, such as the Arctic-Boreal treeline, are strongly coupled with climate and were spatially highly dynamic during past glacial-interglacial cycles. Only a few studies cover vegetation changes since last interglacial, most of former landscapes inundated difficult to access. Using pollen analysis sedimentary ancient DNA (sedaDNA) metabarcoding, we reveal on Bol’shoy Lyakhovsky Island interglacial from permafrost sediments. Last samples depict high levels floral diversity...
Abstract. The composition of perennially frozen deposits holds information on the palaeo-environment during and following deposition. In this study, we investigate late Pleistocene permafrost at western coast Buor Khaya Peninsula in south-central Laptev Sea (Siberia), namely prominent eastern Siberian Yedoma Ice Complex (IC). Two IC exposures one drill core were studied for cryolithological (i.e. ice sediment features), geochemical, geochronological parameters. Borehole temperatures measured...
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...
ABSTRACT Arctic warming and permafrost thaw visibly expose changes in the landscape of Lena River delta, largest delta. Determining past modern river regime thick deltaic deposits shaping mouth north‐eastern Siberia is critical for understanding history delta formation carbon sequestration. Using a 65 m long sediment core from apex set sedimentological techniques applied to aid reconstructing history. The analysis includes: (i) grain‐size measurements determination bedload composition; (ii)...
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...