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Found 93 datasets

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Holozäne Umweltrekonstruktion und Kulturgeschichte der Sahara: Perspektiven aus der sudanesischen Wüste

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Aquatic community response in a groundwater-fed desert lake to Holocene desiccation of the Sahara doi Spatial

The finely laminated sediment record of a permanent, hypersaline, desert oasis lake in the Ounianga region of northeastern Chad presents a unique opportunity to document the hydrological evolution of this groundwater-fed aquatic ecosystem during mid- and late-Holocene desiccation of the Sahara. In this study we reconstruct long-term changes in zoobenthos and zooplankton communities of Lake Yoa as their early-Holocene freshwater habitat changed into the hypersaline conditions prevailing today. Chironomid...
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Response to Comment by Brovkin and Claussen on “Climate-Driven Ecosystem Succession in the Sahara: The Past 6000 Years” doi

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 of abrupt versus gradual desiccation of the Sahara are sufficiently diverse that paleoecological data from a continuous natural archive can usefully guide the evaluation of model parameters responsible for this diversity.
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Sedimentation changes in a complete Holocene lacustrine record in the Sahara: Varve thickness, seasonality and event layers – Problems of identification, interpretation and chronology. Spatial

Lake Yoa (19.03°N, 20.31°E, 380 m a.s.l.) is a groundwater-fed lake in the hyperarid eastern Sahara halfway between the Tibesti Mountains and the Ennedi plateau. Kröpelin et al. (2008) revealed that the bottom sediments contain a unique archive of climatic and environmental change in the Earth´s major desert. The 7.5 m sediment record of OUNIK03/04 which covers 6,100 years has been extended to a maximum drill depth of 15.7 m during a 2010 coring campaign within the framework of the Collaborative...
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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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