A5084411757- Geology and Paleoclimatology Research
- Rangeland Management and Livestock Ecology
- Pleistocene-Era Hominins and Archaeology
- Tree-ring climate responses
- Archaeology and ancient environmental studies
- Isotope Analysis in Ecology
- Geological formations and processes
- Plant Water Relations and Carbon Dynamics
- Karst Systems and Hydrogeology
- Groundwater and Isotope Geochemistry
- Aquatic Ecosystems and Biodiversity
- Geological and Geochemical Analysis
- Fire effects on ecosystems
- Control Systems and Identification
- demographic modeling and climate adaptation
- Hydrocarbon exploration and reservoir analysis
- Landslides and related hazards
- Physics and Engineering Research Articles
- Climate change and permafrost
- Bladder and Urothelial Cancer Treatments
- Chronic Obstructive Pulmonary Disease (COPD) Research
- Ecology and Vegetation Dynamics Studies
- Environmental and Agricultural Sciences
- Data Analysis with R
- Paleontology and Stratigraphy of Fossils
Technische Universität Dresden
1960-2024
Martin Luther University Halle-Wittenberg
2017-2022
Philipps University of Marburg
2021
Aberystwyth University
2021
Instituto Pirenaico de Ecología
2021
V. B. Sochava Institute of Geography
2021
Universität Greifswald
1971
Fire is the most frequent disturbance in Ericaceous Belt (ca 3000-4300 m.a.s.l.), one of important plant communities tropical African mountains. Through resprouting after fire, Erica establishes a positive fire feedback under certain burning regimes. However, present-day human activity Bale Mountains Ethiopia includes and grazing systems that may have negative impact on resilience ericaceous ecosystem. Current knowledge Erica-fire relationships based studies modern vegetation, lacking longer...
Abstract In eastern Africa, there are few long, high-quality records of environmental change at high altitudes, inhibiting a broader understanding regional climate change. We investigated Holocene lacustrine sediment archive from Lake Garba Guracha, Bale Mountains, Ethiopia, (3,950 m asl), and reconstructed high-altitude lake evaporation history using δ 18 O derived the analysis compound-specific sugar biomarkers diatoms. The diatom fuc clearly correlated reveal similar ranges (7.9‰ 7.1‰,...
Abstract. Erica is a dominant vegetation type in many sub-afroalpine ecosystems, such as the Bale Mountains Ethiopia. However, past extent of not well known and climate versus anthropogenic influence on altitudinal shifts are difficult to assign unambiguously, especially during Holocene. The main objective present study chemotaxonomically characterize plant species occurring using lignin phenols n-alkane biomarkers examine potential those for reconstructing history. Fresh material, organic...
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. Eastern Africa has experienced strong climatic changes since the last deglaciation (15 000 years ago). The driving mechanisms and teleconnections of these spatially complex climate variations are yet not fully understood. Although previous studies on lake systems have enhanced our knowledge Holocene precipitation variation in eastern Africa, relatively few reconstructed terrestrial temperature history from archives. Here, we present (i) a new branched glycerol dialkyl tetraether...
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 Previous paleolimnological studies demonstrated that the sediments of Garba Guracha, situated at 3950 m asl in afro-alpine zone Bale Mountains Ethiopia, provide a complete Late Glacial and Holocene paleoclimate environmental archive. We revisited Guracha order to retrieve new sediment cores apply proxies, e.g. charcoal, diatoms, biomarkers, stable isotopes. Our chronology is established using 210 Pb dating radiocarbon bulk sedimentary organic matter, n -alkanes, charcoal. Although...
Abstract Low-altitude lakes in eastern Africa have long been investigated and provided valuable information about the Late Quaternary paleohydrological evolution, such as African Humid Period. However, records often suffer from poor age control, resolution, and/or ambiguous proxy interpretation, only little focus has put on high-altitude regions despite their sensitivity to global, regional, local climate change phenomena. Here we report Last Glacial environmental fluctuations at 4000 m asl...
Abstract The hydrogen isotopic composition of leaf wax–derived n -alkane (δ 2 H ) and oxygen hemicellulose–derived sugar 18 O biomarkers are valuable proxies for paleoclimate reconstructions. Here, we present a calibration study along the Bale Mountains in Ethiopia to evaluate how accurately precisely precipitation is imprinted these biomarkers. -Alkanes sugars were extracted from topsoil samples compound–specific δ values measured using gas chromatograph–thermal conversion–isotope ratio...
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...
Abstract Organic matter in sedimentary archives is abundantly used to reconstruct paleoenvironmental and climate histories. Thereby, distinguishing between the terrestrial aquatic origin of organic often a prerequisite for robust interpretations. In this case study, we use published data modern plants topsoils identify versus source n -alkane sugar biomarkers two afro-alpine sediment (Lake Garba Guracha Depression B4) Bale Mountains, Ethiopia. The results our comparative approach show that...
Abstract. The analysis of the stable oxygen isotopes 18O and 16O has revolutionized paleoclimate research since middle last century. Particularly, δ18O ice cores from Greenland Antarctica is used as a paleotemperature proxy, deep-sea sediments proxy for global volume. Important terrestrial archives to which successfully applied are speleothems, lake sediments, or tree rings. By contrast, applications loess–paleosol sequences (LPSs) scarce. Here we present first continuous record (n=50) LPS...
Abstract. Eastern Africa has experienced strong climatic changes since the last deglaciation (15,000 years ago). The driving mechanisms and teleconnections of these spatially complex climate variations are yet not fully understood. Although previous studies on lake systems have largely enhanced our knowledge Holocene precipitation variation in eastern Africa, few such reconstructed terrestrial temperature history from archives. Here, we present (i) a new branched glycerol dialkyl tetraether...