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Found 89 datasets

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Neues aus der sudanesischen Sahara

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La fin du Sahara vert

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Seen in der Sahara doi

Große Wasserflächen inmitten der Wüste sind nicht nur ein Naturspektakel, sondern auch ein hochpräzises Umweltarchiv. Die aus ihnen gewonnenen Sedimente dokumentieren die Klimaentwicklung und geben Aufschluss über Staubstürme, Savannenbrände und Vulkanausbrüche. Eine Reise in den Nordosten des Tschad. Von Stefan Kröpelin
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Lakes in the Sahara doi

Large bodies of water in the middle of the desert are not only a natural spectacle, they also contain extremely precise environmental archives. Sediments extracted from these lakes document climate evolution and provide information on dust storms, savannah fires and volcanic eruptions. A journey to north-east Chad By Stefan Kröpelin
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Genese und Persistenz von Wüstenpflastern in den Tropen und Subtropen.

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Sedimentologische Untersuchungen archäologischer Fundschichten der Sodmein Cave, Ägyptische Ostwüste.

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Boni Island - Holozäne Landschaftsdynamik und Mensch-Umwelt-Beziehung am Vierten Nil-Katarakt (Nord-Sudan) Spatial

Der Vierte Nil-Katarakt im Nord-Sudan ist im Jahr 2008 im Hamdab-Stausee untergegangen. Geowissenschaftlich und archäologisch bislang kaum erforscht, stellte er eine einzigartige landschaftliche Versuchsanordnung dar. Am Beispiel der Insel Boni, die für die vorliegende Studie vor der Flutung im Rahmen des Sonderforschungsbereichs 389 untersucht wurde, wird gezeigt, dass die tektonisch angelegte Kleinkammerung des Reliefs und die nachfolgende, periodisch und saisonal stark wechselnde fluviale und äolische...
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Feasibility studies of terrestrial laser scanning in Coastal Geomorphology, Agronomy, and Geoarchaeology

Terrestrial laser scanning (TLS) is a newer, active method of remote sensing for the automatic detection of 3D coordinate points. This method has been developed particularly during the last 20 years, in addition to airborne and mobile laser scanning methods. All these methods use laser light and additional angle measurements for the detection of distances and directions. Thus, several thousands to hundreds of thousands of polar coordinates per second can be measured directly by an automatic deflection of...
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Varved sediments of Lake Yoa (Ounianga Kebir, Chad) reveal progressive drying of the Sahara during the last 6100 years doi Spatial

The sedimentological and geochemical properties of a 7.47 m long laminated sequence from hypersaline Lake Yoa in northern Chad have been investigated, representing a unique, continuous 6100 year long continental record of climate and environmental change in the eastern Central Sahara. These data were used to reconstruct the Mid to Late Holocene history of this currently hyper-arid region, in order to address the question of whether the Mid Holocene environmental transition from a humid to a dry Sahara was...
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Modern and early Holocene mollusc fauna of the Ounianga lakes (northern Chad): implications for the palaeohydrology of the central Sahara doi Spatial

The fresh and saline lakes of Ounianga Kebir and Serir in northeastern Chad are among the very few permanent aquatic ecosystems currently existing in the hyper-arid core of the Sahara desert. The confirmed modern fauna of aquatic molluscs at Ounianga comprises three widespread species (Melanoides tuberculata, Biomphalaria pfeifferi and Lymnaea natalensis), of which only the first appears to maintain a thriving population. We recovered seven more species of gastropods, among which one is new to science...
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Climate-Driven Ecosystem Succession in the Sahara: The Past 6000 Years doi Spatial

Desiccation of the Sahara since the middle Holocene has eradicated all but a few natural archives recording its transition from a “green Sahara” to the present hyperarid desert. Our continuous 6000-year paleoenvironmental reconstruction from northern Chad shows progressive drying of the regional terrestrial ecosystem in response to weakening insolation forcing of the African monsoon and abrupt hydrological change in the local aquatic ecosystem controlled by site-specific thresholds. Strong reductions...
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Climatic change recorded in the sediments of the Chew Bahir basin, southern Ethiopia, during the last 45,000 years Spatial

East African paleoenvironments are highly variable, marked by extreme fluctuations in moisture availability, which has far-reaching implications for the origin, evolution and dispersal of Homo sapiens in and beyond the region. This paper presents results from a pilot core from the Chew Bahir basin in southern Ethiopia that records the climatic history of the past 45 ka, with emphasis on the African Humid Period (AHP, w15e5 ka calBP). Geochemical, physical and biological indicators show that Chew Bahir...
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