A5045257779- Climate change and permafrost
- Geological Studies and Exploration
- Cryospheric studies and observations
- Geology and Paleoclimatology Research
- Methane Hydrates and Related Phenomena
- Planetary Science and Exploration
- Indigenous Studies and Ecology
- Arctic and Antarctic ice dynamics
- Polar Research and Ecology
- Hydrocarbon exploration and reservoir analysis
- Soil Geostatistics and Mapping
- Geological formations and processes
- Landslides and related hazards
- Space Science and Extraterrestrial Life
- Arctic and Russian Policy Studies
- Archaeology and ancient environmental studies
- Soil Moisture and Remote Sensing
- Geochemistry and Geologic Mapping
- Soil and Unsaturated Flow
- Biochemical and biochemical processes
- Geological Modeling and Analysis
- Archaeological Research and Protection
- Geophysical Methods and Applications
- Health and Conflict Studies
- Microbial Community Ecology and Physiology
German Environment Agency
2022-2024
Leipzig University
2012-2023
Leibniz Institute for Regional Geography
2013-2022
Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung
2008-2013
Gen Foundation
1885
Permafrost is a distinct feature of the terrestrial Arctic and vulnerable to climate warming. degrades in different ways, including deepening seasonally unfrozen surface localized but rapid development deep thaw features. Pleistocene ice-rich permafrost with syngenetic ice-wedges, termed Yedoma deposits, are widespread Siberia, Alaska, Yukon, Canada may be especially prone rapid-thaw processes. Freeze-locked organic matter such deposits can re-mobilized on short time-scales contribute...
[1] Estimates for circumpolar permafrost organic carbon (OC) storage suggest that this pool contains twice the amount of current atmospheric carbon. The Yedoma region sequestered substantial quantities OC and is unique because its deep OC, which was incorporated into during ice age conditions. Rapid inclusion labile matter halted decomposition resulted in a long-term sink. We show frozen consists two distinct major subreservoirs: deposits (late Pleistocene ice- organic-rich silty sediments)...
Ice-rich permafrost in the circum-Arctic and sub-Arctic (hereafter pan-Arctic), such as late Pleistocene Yedoma, are especially prone to degradation due climate change or human activity. When Yedoma deposits thaw, large amounts of frozen organic matter biogeochemically relevant elements return into current biogeochemical cycles. This mobilization has local global implications: increased thaw thermokarst thermal erosion settings enhances greenhouse gas fluxes from regions. In addition, this...
Lakes are a ubiquitous landscape feature in northern permafrost regions. They have strong impact on carbon, energy and water fluxes can be quite responsive to climate change. The monitoring of lake change high latitudes, at sufficiently accurate spatial temporal resolution, is crucial for understanding the underlying processes driving To date, studies regions were based variety different sources, image acquisition periods single snapshots, localized analysis, which hinders comparison Here,...
Wedge-ice volume (WIV) is a key factor in assessing the response of ice-rich permafrost landscapes to thaw and quantifying deep soil carbon inventories. Here, we present method for calculating WIV late Pleistocene Yedoma deposits Holocene thermokarst basin at four study areas Siberia Alaska. Ice-wedge polygons mound (baydzherakh) patterns were mapped on different landscape units using very high-resolution (0.5 m/pixel) satellite imagery (WorldView-1 GeoEye-1). In geographic information...
On Earth, the thawing of permafrost deposits with high‐ground ice content results in massive surface subsidence and formation characteristic large thermokarst depressions. Slope asymmetries within depressions suggest lateral growth, which occurs due to thermoerosion gravimetric mass wasting along these slopes. It has been proposed that rimless, asymmetrically shaped (called scalloped depressions) on Mars were formed by insolation‐driven ground sublimation. We investigated a depression...
Abstract Periglacial landforms on Spitsbergen (Svalbard, Norway) are morphologically similar to Mars that probably related the past and/or present existence of ice at or near surface. Many these landforms, such as gullies, debris-flow fans, polygonal terrain, fractured mounds and rock-glacier-like features, observed in close spatial proximity mid-latitude craters Mars. On Svalbard, analogous occur strikingly proximity, which makes them useful study cases infer chronological evolution Martian...
Abstract The Central Yakutian permafrost landscape is rapidly being modified by land use and global warming, but small‐scale thermokarst process variability hydrological conditions are poorly understood. We analyze lake‐area changes thaw subsidence of young lakes on ice‐complex deposits (yedoma lakes) in comparison to residual alas basins during the last 70 years for a local study site we record regional lake size distribution different ice‐rich terraces using satellite historical airborne...
Abstract. The late Pleistocene Yedoma Ice Complex is an ice-rich and organic-bearing type of permafrost deposit widely distributed across Beringia assumed to be especially prone deep degradation with warming temperature, which a potential tipping point the climate system. To better understand formation, its local characteristics, regional sedimentological composition, we compiled grain-size distributions (GSDs) 771 samples from 23 locations Arctic; sites located close together were pooled...
Dryland soil salinization strongly affects properties, with severe consequences for regional ecology, agriculture and the aeolian dust dynamics. Given its climate-sensitivity it forms a serious environmental hazard, to cope this challenge during current global warming needs be better understood. The Bajestan Playa in salinization-affected Iranian drylands hosts several protected areas an important source. Hence, region local ecosystems societies, but was not systematically studied yet. Using...
Permafrost-agroecosystems include all cultivation and pastoral activities in areas underlain by permafrost. These systems support local livelihoods food production are rarely considered global agricultural studies but may become more relevant as climate change is increasing opportunities for high latitude mountainous areas. The exact locations amount of containing permafrost currently unknown, therefore we provide an overview countries where both present. We highlight the socioecological...
The reconstruction of Holocene thermokarst landform evolution is important to understand the potential impact current global climate change on permafrost regions. A multi-proxy approach was applied analyse sedimentological and biogeochemical characteristics as well pollen lacustrine microfossils a core profile drilled in small pingo within large Central Yakutian basin (alas). Age–depth modelling with macrofossil 14 C ages reveals high deposit sedimentation rates complete sequence spanning...
Abstract Permafrost thaw leads to thermokarst lake formation and talik growth tens of meters deep, enabling microbial decomposition formerly frozen organic matter (OM). We analyzed two 17‐m‐long sediment cores taken in Central Yakutia, Russia. One core was from an Alas a Holocene basin that underwent multiple generations, the second young Yedoma upland (formed ~70 years ago) whose sediments have thawed for first time since deposition. This comparison provides glance into OM fate thawing...
C u p r i s a l z d e Benz-oxy-amidoxims.Die Darstellung des Oxy-amidoxims geschah nach den Angaben von L y I) bezw.von W n 3. Um ein reioes, krystallisierendes Benz-bydroximsiiurechlorid zu erbnlten, ist es notig, mtiglichst reinem Benzaldoxim auszugeben.Die Chlorierung kann statt chloroformischer such in iitheriscber LBsung erfolgen.Far das rotbraune Kupfersalz wurde dip 'fruher angegebene Zusammensetzung bestiitigt: 0.
Abstract. Permafrost ground is one of the largest repositories terrestrial organic carbon and might become or already a source in response to ongoing global warming. With this study syngenetically frozen, ice-rich (OC)-bearing Yedoma associated alas deposits central Yakutia (Republic Sakha), we aimed assess local sediment deposition regime its impact on permafrost storage. For purpose, investigated Yukechi area (61.76495∘ N, 130.46664∘ E), which thermokarst landscape degrading into Yakutia....