A5057560670- Geology and Paleoclimatology Research
- Climate change and permafrost
- Methane Hydrates and Related Phenomena
- Cryospheric studies and observations
- Geological Studies and Exploration
- Arctic and Antarctic ice dynamics
- Atmospheric and Environmental Gas Dynamics
- Tree-ring climate responses
- Isotope Analysis in Ecology
- Archaeology and ancient environmental studies
- Metabolomics and Mass Spectrometry Studies
- Polar Research and Ecology
- Indigenous Studies and Ecology
- Atmospheric chemistry and aerosols
- Marine and environmental studies
- Hydrocarbon exploration and reservoir analysis
- Groundwater and Isotope Geochemistry
- Microbial Community Ecology and Physiology
- Radioactive contamination and transfer
- Atmospheric Ozone and Climate
- Analytical Chemistry and Chromatography
- Pleistocene-Era Hominins and Archaeology
- Scientific Research and Discoveries
- Fire effects on ecosystems
- Arctic and Russian Policy Studies
Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung
2016-2025
University of Sussex
2016-2020
University of Toronto
2020
Terrestrial Ecosystem Research Network
2015
Humboldt-Universität zu Berlin
2005-2011
Abstract Reproducible climate reconstructions of the Common Era (1 CE to present) are key placing industrial-era warming into context natural climatic variability. Here we present a community-sourced database temperature-sensitive proxy records from PAGES2k initiative. The gathers 692 648 locations, including all continental regions and major ocean basins. trees, ice, sediment, corals, speleothems, documentary evidence, other archives. They range in length 50 2000 years, with median 547...
Abstract. Observations of coastline retreat using contemporary very high resolution satellite and historical aerial imagery were compared to measurements open water fraction, summer air temperature, wind. We analysed seasonal interannual variations thawing-induced cliff top (thermo-denudation) marine abrasion (thermo-abrasion) on Muostakh Island in the southern central Laptev Sea. Geomorphometric analysis revealed that total ground ice content is made up equal amounts intrasedimentary macro...
Significance The first century BCE fall of the Roman Republic and Ptolemaic Kingdom subsequent rise Empire were among most important political transitions in history Western civilization. Volcanic fallout well-dated Arctic ice core records, climate proxies, Earth system modeling show that this transition occurred during an extreme cold period resulting from a massive eruption Alaska’s Okmok volcano early 43 BCE. Written sources describe unusual climate, crop failures, famine, disease, unrest...
Role of changing climatic conditions on permafrost degradation and hydrology was investigated in the transition zone between tundra forest ecotones at boundary continuous discontinuous lower Yenisei River. Three watersheds various sizes were chosen to represent characteristics regional landscape conditions. Samples river flow, precipitation, snow cover, ground ice collected over determine isotopic composition potential sources water a flow two year period. Increases air temperature last...
Abstract. Reconstructions of global hydroclimate during the Common Era (CE; past ∼2000 years) are important for providing context current and future environmental change. Stable isotope ratios in water quantitative indicators on regional to scales, these signals encoded a wide range natural geologic archives. Here we present Iso2k database, compilation previously published datasets from variety archives that record stable oxygen (δ18O) or hydrogen (δ2H) isotopic compositions waters, which...
Lead pollution in Arctic ice reflects large-scale historical changes midlatitude industrial activities such as ancient lead/silver production and recent fossil fuel burning. Here we used measurements a broad array of 13 accurately dated cores from Greenland Severnaya Zemlya to document spatial temporal lead 200 BCE 2010 CE, with interpretation focused on 500 CE. Atmospheric transport modeling indicates that was primarily European emissions before the 19th-century Industrial Revolution....
Abstract Black carbon emitted by incomplete combustion of fossil fuels and biomass has a net warming effect in the atmosphere reduces albedo when deposited on ice snow; accurate knowledge past emissions is essential to quantify model associated global climate forcing. Although bottom-up inventories provide historical Carbon emission estimates that are widely used Earth System Models, they poorly constrained observations prior late 20th century. Here we use an objective inversion technique...
Atmospheric nuclear weapons testing (NWT) resulted in the injection of plutonium (Pu) into atmosphere and subsequent global deposition. We present a new method for continuous semiquantitative measurement (239)Pu ice cores, which was used to develop annual records fallout from NWT ten cores Greenland Antarctica. The measured directly using an inductively coupled plasma-sector field mass spectrometer, thereby reducing analysis time increasing depth-resolution with respect previous methods. To...
The degradation of ice-rich permafrost deposits has the potential to release large amounts old carbon (C) and nitrogen (N) with severe local implications such as affecting riverine near-shore zone ecosystems but also global impacts greenhouse gases into atmosphere. Here we study rapid erosion up 27.7 m high 1,660 long Sobo-Sise yedoma cliff in Lena River Delta using a remote sensing-based time-series analysis covering 53 years calculate mean annual sediment well C N River. We find that...
Abstract Late Pleistocene and Holocene ground ice are common throughout the Arctic. Some forms of relict preserve local meteoric water, their stable oxygen‐ hydrogen‐isotope ratios can be used to reconstruct past air temperatures. In this paper, we review formation sampling two ice—wedge pore ice—and recent (2010–2019) advances in paleoclimatological studies ground‐ice isotope records Recent attributed better chronological constraints refined understandings systematics seasonality wedge ice....
Abstract Dating of ancient permafrost is essential for understanding long-term stability and interpreting palaeoenvironmental conditions but presents substantial challenges to geochronology. Here, we apply four methods from the megaslump at Batagay, east Siberia: (1) optically stimulated luminescence (OSL) dating quartz, (2) post-infrared infrared-stimulated (pIRIR) K-feldspar, (3) radiocarbon organic material, (4) 36 Cl/Cl ice wedges. All chronometers produce stratigraphically consistent...
Abstract Pronounced glacial and interglacial climate cycles characterized northern ecosystems during the Pleistocene. Our understanding of resultant community transformations past ecological interactions strongly depends on taxa found in fossil assemblages. Here, we present a shotgun metagenomic analysis sedimentary ancient DNA ( seda DNA) to infer ecosystem‐wide biotic composition (from viruses megaherbivores) from Middle Late Pleistocene at Batagay megaslump, East Siberia. The records...
The Younger Dryas cold event, a rapid reversion to glacial climate conditions at the Pleistocene‐Holocene transition, has generally been attributed release of meltwater from Laurentide Ice Sheet North Atlantic or Arctic oceans. reaction Pacific region this “shutdown” thermohaline circulation in during is little understood. In paper, we present first radiocarbon‐dated centennial‐scale stable water isotope record permafrost northern Alaska. This Late Glacial winter reconstruction Barrow ice...
Abstract The stable isotopic composition ( δ 18 O, D, d ) of three Holocene‐age ice wedges at the Dmitrii Laptev Strait, Russia (Oyogos Yar coast, 72.7°N, 143.5°E) was studied high resolution (100 to 200 samples each) in order develop palaeoclimatic records. AMS 14 C ages organic matter prove Late Holocene age horizontal ice‐wedge profiles and indicate syngenetic growth associated with sediment accumulation. Co‐isotopic relationships wedge close Global Meteoric Water Line point a good...
Abstract. Thermal permafrost degradation and coastal erosion in the Arctic remobilize substantial amounts of organic carbon (OC) nutrients which have accumulated late Pleistocene Holocene unconsolidated deposits. Permafrost vulnerability to thaw subsidence, collapsing coastlines irreversible landscape change are largely due presence large massive ground ice such as wedges. However, has not, until now, been considered be a source dissolved (DOC), inorganic (DIC) other elements important for...
Abstract. To reconstruct palaeoclimate and palaeoenvironmental conditions in the northeast Siberian Arctic, we studied late Quaternary permafrost at Oyogos Yar coast (Dmitry Laptev Strait). New infrared-stimulated luminescence ages for distinctive floodplain deposits of Kuchchugui Suite (112.5 ± 9.6 kyr) thermokarst-lake Krest Yuryakh (102.4 9.7 kyr), respectively, provide new substantial geochronological data shed light on landscape history Dmitry Strait region during Marine Isotope Stage...
Abstract. Ice wedges in the Yana Highlands of interior Yakutia – most continental region Northern Hemisphere were investigated to elucidate changes winter climate and continentality that have taken place since Middle Pleistocene. The Batagay megaslump exposes ice composite sampled from three cryostratigraphic units: lower complex likely pre-Marine Isotope Stage (MIS) 6 age, upper (Yedoma) sand unit (both MIS 3 2). A terrace nearby Adycha River provides a Late Holocene (MIS 1) wedge serves as...
Abstract. In the last decades, changing climate conditions have had a severe impact on sea ice at western Antarctic Peninsula (WAP), an area rapidly transforming under global warming. To study development of spring and environmental in pre-satellite era we investigated three short marine sediment cores for their biomarker inventory with particular focus proxy IPSO25 micropaleontological proxies. The core sites are located Bransfield Strait shelf to deep basin areas characterized by complex...