A5080092816- Geology and Paleoclimatology Research
- Geological and Geophysical Studies Worldwide
- African Botany and Ecology Studies
- African Studies and Geopolitics
- Mediterranean and Iberian flora and fauna
- Water management and technologies
- Geological formations and processes
- Agriculture and Rural Development Research
- Pleistocene-Era Hominins and Archaeology
- Animal Diversity and Health Studies
- Aeolian processes and effects
- Archaeological and Geological Studies
- Rangeland Management and Livestock Ecology
- Cognitive Science and Education Research
- Ecosystem dynamics and resilience
- Transboundary Water Resource Management
- Aquatic Invertebrate Ecology and Behavior
- Categorization, perception, and language
- History and Developments in Astronomy
- Tree-ring climate responses
- Paleontology and Stratigraphy of Fossils
- French Urban and Social Studies
- German Literature and Culture Studies
- Aquatic Ecosystems and Biodiversity
- Climate Change Policy and Economics
University of Cologne
2008-2024
Deutsches Archäologisches Institut, Zentrale
2011-2023
Freie Universität Berlin
1987-2021
Technische Universität Berlin
2021
Université de Versailles Saint-Quentin-en-Yvelines
2008
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2008
Centre National de la Recherche Scientifique
2008
Ghent University
2008
Laboratoire des Sciences du Climat et de l'Environnement
2008
Radiocarbon data from 150 archaeological excavations in the now hyper-arid Eastern Sahara of Egypt, Sudan, Libya, and Chad reveal close links between climatic variations prehistoric occupation during past 12,000 years. Synoptic multiple-indicator views for major time slices demonstrate transition initial settlement after sudden onset humid conditions at 8500 B.C.E. to exodus resulting gradual desiccation since 5300 Southward shifting desert margin helped trigger emergence pharaonic...
Field research into the climatic history and shifting of East Saharan desert has furnished evidence that during Quaternary time present extremely arid western part Upper Nubia (northern Sudan)was temporarily linked to Nile by way a hitherto unknown 400 kilometer long tributary. From about 9500 4500 years ago, lower Wadi Howar flowed through an environment characterized numerous ground water outlets freshwater lakes. Savanna fauna cattle-herders occupied this region, which today receives at...
Abstract The sedimentological and geochemical properties of a 7·47 m long laminated sequence from hypersaline Lake Yoa in northern Chad have been investigated, representing unique, continuous 6100 year continental record climate environmental change the eastern Central Sahara. These data were used to reconstruct Mid Late Holocene history this currently hyper‐arid region, order address question whether transition humid dry Sahara was progressive or abrupt. This study involved suite analyses,...
Abstract Geoarchaeological and chronological evidence from the remote Gilf Kebir Plateau in southwest Egypt suggests a new model for influence of early mid‐Holocene precipitation regimes on land‐use strategies prehistoric settlers what is now center largest hyperarid area earth. We hypothesize that quantitatively higher, daytime, monsoon summer rainfall characteristic Holocene (9300–5400 14 C yr B.P./8400–4300 B.C.) resulted less grass growth plateau compared to winter rains presumably fell...
Abstract African basin‐and‐swell morphology is often attributed to the planform of subplate mantle convection. Across North Africa, coincidence Neogene and Quaternary (i.e., <23 Ma) magmatism, topographic swells, long wavelength gravity anomalies, slow shear wave velocity anomalies within asthenosphere provides observational constraints for this hypothesis. Admittance analysis fields corroborates existence support. To investigate quantitative relationships between intraplate velocity,...
Abstract Field research in the eastern Sahara (Northwest Sudan) revealed extensive early- to mid-Holocene lake marl deposits bearing gyrogonites of Charophytes (green algae, stoneworts) along lower course Wadi Howar, an extinct tributary Nile. The Charophyte flora a paleolake southwest Jebel Rahib (17°31′N/26°52′E) dated prior 4720 ± 110 yr B.P. is mainly composed ecologically sensitive species Nitellopsis obtusa which indicates permanent, relatively deep (4–12 m) and cool oligotrophic...
Wadi Hariq is a complex valley system in the Northwest Sudan about 400 km west of Nile. Stratigraphic investigations provide new data on environmental and climatic history present-day hyperarid centre southeastern Sahara. Archaeological work there only started at end 1990s, with survey excavations carried out as part multidisciplinary research project ACACIA University Cologne. To date, 104 sites are known Hariq. Based pottery found these sites, most can be attributed to Handessi Horizon,...
Abstract The fresh and saline lakes of Ounianga Kebir Serir in northeastern Chad are among the very few permanent aquatic ecosystems currently existing hyper‐arid core Sahara desert. confirmed modern fauna molluscs at comprises three widespread species ( Melanoides tuberculata , Biomphalaria pfeifferi Lymnaea natalensis ), which only first appears to maintain a thriving population. We recovered seven more gastropods, one is new science Gabbiella ouniangaensis bivalve from early Holocene...
The Lake Yoa record and archaeological data provide adequate evidence that mid-Holocene aridification did not occur abruptly across all of North Africa. Modeling results on the issue abrupt versus gradual desiccation Sahara are sufficiently diverse paleoecological from a continuous natural archive can usefully guide evaluation model parameters responsible for this diversity.
Other| January 01, 1989 L'aridification du Sahara oriental a l'Holocene moyen et superieur H. J. Pachur; Pachur Author Freie Univ. Berlin, Geomorphol. Lab., Berlin 1000, Federal Republic of Germany Search for other works by this author on: GSW Google Scholar S. Kropelin Bulletin de la Société Géologique France (1989) V (1): 99–107. https://doi.org/10.2113/gssgfbull.V.1.99 Article history first online: 03 Mar 2017 Cite View This Citation Add to Manager Share Icon Twitter LinkedIn Tools Get...
Abstract
<title>Abstract</title> The Sahara and the Sahel are currently experiencing an increase in rainfall during rainy season, possibly related to strengthening of hydrological cycle induced by global warming. However, slowdown Atlantic Meridional Overturning Circulation (AMOC) might be able counteract this trend, decreasing North African monsoon a timely, but highly uncertain, manner. During early mid-Holocene, experienced wet phase that offers good analogue for testing impact AMOC perturbation...