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ISBN: 3934923038 Year: 2000 Publisher: Hamburg Kruse
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ISBN: 3927688322 Year: 2007 Publisher: Köln : Heinrich-Barth-Institut,
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SEP Separates --- Egypt --- Sahara --- desert --- oases --- vegetation
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ISSN: 09472673 ISBN: 9783927688407 3927688401 Year: 2013 Publisher: Köln Heinrich-Barth-Institut
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Petroglyphs --- Rock paintings --- Prehistoric peoples --- Cavemen (Prehistoric peoples) --- Early man --- Man, Prehistoric --- Prehistoric archaeology --- Prehistoric human beings --- Prehistoric humans --- Prehistory --- Human beings --- Antiquities, Prehistoric --- Paintings, Rock --- Pictured rocks --- Rock drawings --- Archaeology --- Art, Prehistoric --- Painting, Prehistoric --- Picture-writing --- Carvings, Rock --- Engravings, Rock --- Rock carvings --- Rock engravings --- Rock inscriptions --- Stone inscriptions --- Inscriptions --- Western Desert (Egypt) --- Ṣaḥraʼ al-Gharbiyah (Egypt) --- Libyan Desert --- Antiquities. --- Primitive societies
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ISBN: 9783927688384 Year: 2011 Publisher: Köln Heinrich-Barth-Institut
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ISSN: 09472673 ISBN: 9783927688322 Year: 2007 Publisher: Köln Heinrich-Barth-Institut
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Arid regions ecology --- Arid regions ecology --- Arid regions --- Arid regions --- Africa --- Antiquities.
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Year: 2008
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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 for 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 in tropical trees and then Sahelian grasslandcover allowed large-scale dust mobilization from 4300 calendar years before the present (cal yr B.P.). Today's desert ecosystem and regional wind regime were established around 2700 cal yr B.P. This gradual rather then abrupt termination of the African Humid Period in the eastern Sahara suggests a relatively weak biogeophysical feedback on climate.
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