A5023849392- Geology and Paleoclimatology Research
- Pleistocene-Era Hominins and Archaeology
- Geological formations and processes
- Tree-ring climate responses
- Geological Studies and Exploration
- Archaeology and ancient environmental studies
- Methane Hydrates and Related Phenomena
- Isotope Analysis in Ecology
- Geophysics and Gravity Measurements
- Soil erosion and sediment transport
- Plant Water Relations and Carbon Dynamics
- Geomagnetism and Paleomagnetism Studies
- Hydrocarbon exploration and reservoir analysis
- Marine and environmental studies
- Geological and Geophysical Studies Worldwide
- Groundwater and Isotope Geochemistry
- Climate variability and models
- Plant and fungal interactions
- Bioenergy crop production and management
- Paleontology and Stratigraphy of Fossils
- Plant Surface Properties and Treatments
- Hydrology and Sediment Transport Processes
- Wastewater Treatment and Nitrogen Removal
- Plant Taxonomy and Phylogenetics
- Biocrusts and Microbial Ecology
Friedrich Schiller University Jena
2018-2023
Oeschger Centre for Climate Change Research
2018-2023
University of Bern
2018-2023
V. B. Sochava Institute of Geography
2021
ORCID
2021
Universität Trier
2016
Abstract. Leaf wax n-alkane patterns and their compound-specific δ13C signatures are valuable proxies for paleoenvironmental reconstructions. So far, potential has not been investigated in semi-arid to arid Mongolia. We have therefore analysed the leaf n-alkanes signature of five plant species (Poaceae, Cyperaceae, Artemisia spp., Caragana spp. Larix sp.) topsoils (0–5 cm) along two transects central southern Grasses show a distinct dominance n-C31 homologue, whereas shrubs dominated by...
The Late Quaternary climate history of South Africa and, in particular, potential changes atmospheric circulation have been subject to considerable debate. To some extent, this is due a scarcity natural archives, and on the other hand available indirect hydrological proxies are not suited distinguishing between precipitation originating from temperate Westerlies tropical Easterlies. This study presents paleoenvironmental record Vankervelsvlei, wetland located southern Cape coast year-round...
The spatial and temporal interaction of the Westerlies Asian Summer Monsoon (ASM) are often suggested to drive Holocene moisture evolution semi-arid Mongolia Central Asia, but so far, it has remained a controversial topic debate. In this context, we established high-resolution 7.4 cal ka paleohydrological record from Shireet Naiman Nuur in central Mongolian Khangai Mountains using compound-specific biomarker δ2H analyses. Our results suggest that drier conditions 3.6 BP wetter since until...
Abstract Lake sediments are valuable natural archives to reconstruct paleoclimate and paleoenvironmental changes which consist of inorganic organic sediment compounds allochthonous origin from the catchment autochthonous production in lake. However, for robust paleo‐reconstructions it is important develop a better understanding about sedimentation processes, their distribution within In this context, modern process studies provide insights, although environmental anthropological can affect...
The repeated expansion of East Asian steppe cultures was a key driver Eurasian history, forging new social, economic, and biological links across the continent. Climate has been suggested as important these poorly understood cultural expansions, but paleoclimate records from Mongolian Plateau often suffer poor age control or ambiguous proxy interpretation. Here, we use combination geochemical analyses comprehensive radiocarbon dating to establish first robust detailed record...
Abstract Volcanic ash layers are important markers for the chronostratigraphy of paleoclimate and paleoenvironmental archives at southern tip South America. However, this requires that tephras well-dated. We report geochemical data from stalagmite MA1 formed in a non-karst cave near Mt. Burney volcano southernmost Patagonia (~53°S). High-resolution LA-ICP-MS analyses, SEM imagery, EPMA data, NanoSIMS enable to identify volcanogenic signals during last 4.5 kyrs sub-annual trace element...
During marine oxygen isotope stage (MIS) 2, the Swiss Plateau temporarily hosted large piedmont lobe glaciers that retreated after their maximum advance back to fringe of Alps. The presence moraines in this region indicates overall glacier recession was punctuated by repeated phases ice-marginal stability and re-advances. timing these events formerly covered eastern Rhône (or Valais) has been controversial but remains poorly constrained due lack chronological data. To fill gap, 10Be...
Abstract The compound‐specific hydrogen isotopic composition (δ 2 H) of n ‐alkanes is a valuable proxy to investigate hydrological conditions in lake sediments. While terrestrial reflect the signal local precipitation, aquatic incorporate lake's water, which can be strongly modulated by evaporative enrichment. So far, spatial distribution and δ H within lakes have not systematically been investigated. Here, we present results C31 ) C23 surface sediment samples from Lake Khar Nuur, semi‐arid...
Compound-specific hydrogen and oxygen isotope analyzes on leaf wax-derived n -alkanes (δ 2 H n–alkane ) the hemicellulose-derived sugar arabinose 18 O ara are valuable, innovative tools for paleohydrological reconstructions. Previous calibration studies have revealed that δ reflect isotopic composition of precipitation, but – depending region may be strongly modulated by evapotranspirative enrichment. Since no exist semi-arid arid Mongolia so far, we analyzed in topsoils collected along a...
Abstract The Late Holocene marks a substantial cultural and economic transition in the eastern Eurasian Steppe Altai Region with dispersal of nomadic pastoralism. So far, paleoclimate conditions during this time remain unclear controversial. Here, we present high‐resolution 4.2 ka record from Lake Khar Nuur Mongolian that is based on lake sediment proxies biomarker compound‐specific δ 2 H analyses. Our results document increased aridity before ∼3.7 cal. BP, followed by two pronounced phases...
Isotope-based records provide valuable information on past climate changes. However, it is not always trivial to disentangle changes in the isotopic composition of precipitation from possible evaporative enrichment, and seasonality may need be considered. Here, we analyzed δ2H n-alkanes δ18O hemicellulose sugars sediments Bichlersee, Bavaria, covering Late Glacial Early Holocene. Our δ2Hn-C31 record documents summer roughly shows isotope pattern known Greenland. Both show lower values during...
Semi-arid Mongolia is a highly sensitive region to climate changes, but the region’s Holocene paleoclimatic evolution and its underlying forcing mechanisms have been subject of much recent debate. Here we present continuous 7.4 ka sediment record from high-altitude Shireet Naiman Nuur (Nuur = lake) in central Mongolian Khangai Mountains. We extensively dated sediments analyzed elemental composition bulk isotopes for lake characterization. Our results show that 14 C-dating organic carbon...
Abstract. South Africa is a key region to reconstruct and understand past changes in atmospheric circulation, i.e. temperate westerlies tropical easterlies. However, due the scarcity of natural archives, Africa's environmental evolution during late Quaternary remains highly debated. Many available sediment archives are peri-coastal lakes wetlands; however, paleoenvironmental signals these often overprinted by sea-level Holocene. This study presents new record from coastal wetland Voëlvlei,...
Abstract. n-Alkane pattern and their compound-specific δ13C signatures are valuable proxies for paleoenvironmental reconstructions. So far, potential has not been investigated in semi-arid to arid regions. We have therefore analysed the leaf wax n-alkanes of five plant species (Poaceae, Cyperaceae, Artemisia spp., Caragana spp. Larix sp.), topsoils (0–5 cm) along two transects central southern Mongolia. Grasses depict a distinct dominance n-C31 homologue, whereas dominated by n-C29. sp. is...
Abstract Volcanic ash layers are important markers for the chronostratigraphy of paleoclimate and paleoenvironmental archives at southern tip South America. However, this requires that tephras well-dated. We report geochemical data from MA1 stalagmite formed in a non-karst cave near Mt. Burney volcano southernmost Patagonia (~53°S). High-resolution LA-ICP-MS analyses, SEM imagery, NanoSIMS enable to identify volcanogenic signals during last 4.5 kyrs BP sub-annual trace element variations...
During marine isotopic stage (MIS) 2, the Swiss Plateau temporarily hosted large piedmont lobe glaciers and retreated after MIS 2 maximum advance (at around 26 — 24 ka) back to fringe of Alps. The presence moraines on indicates that overall glacier recession was punctuated by repeated phases ice-marginal stability re-advances. timing these events in region formerly covered eastern Rhône (or Valais) has been controversially discussed, but remains poorly constrained due lack chronological...