Document Detail


Climate-driven ecosystem succession in the Sahara: the past 6000 years.
MedLine Citation:
PMID:  18467583     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
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 in tropical trees and then Sahelian grassland cover 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 than abrupt termination of the African Humid Period in the eastern Sahara suggests a relatively weak biogeophysical feedback on climate.
Authors:
S Kröpelin; D Verschuren; A-M Lézine; H Eggermont; C Cocquyt; P Francus; J-P Cazet; M Fagot; B Rumes; J M Russell; F Darius; D J Conley; M Schuster; H von Suchodoletz; D R Engstrom
Related Documents :
10393823 - Effects of size, motility and paralysation time of prey on the quantity of venom inject...
14973483 - Changes in fisheries discard rates and seabird communities.
25467873 - Stable isotope analysis of a newly established macrofaunal food web 1.5years after the ...
Publication Detail:
Type:  Historical Article; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Science (New York, N.Y.)     Volume:  320     ISSN:  1095-9203     ISO Abbreviation:  Science     Publication Date:  2008 May 
Date Detail:
Created Date:  2008-05-09     Completed Date:  2008-05-23     Revised Date:  2008-12-11    
Medline Journal Info:
Nlm Unique ID:  0404511     Medline TA:  Science     Country:  United States    
Other Details:
Languages:  eng     Pagination:  765-8     Citation Subset:  IM    
Affiliation:
Africa Research Unit, Institute of Prehistoric Archaeology, University of Cologne, Jennerstrasse 8, D-50823 Köln, Germany. s.kroe@uni-koeln.de
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:
Africa
Desert Climate*
Ecosystem*
Evolution
Fresh Water
Geologic Sediments
History, Ancient
Plants
Time
Weather
Comments/Corrections
Comment In:
Science. 2008 Nov 28;322(5906):1326; author reply 1326   [PMID:  19039121 ]
Science. 2008 May 9;320(5877):752-3   [PMID:  18467577 ]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


Previous Document:  Toward an AIDS vaccine.
Next Document:  Controlled phase shifts with a single quantum dot.