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Daniel Conley

Daniel Conley

Professor

Daniel Conley

Climate-driven ecosystem succession in the Sahara: The past 6000 years

Författare

  • S Kroepelin
  • D Verschuren
  • A -M Lezine
  • H Eggermont
  • C Cocquyt
  • P Francus
  • J -P Cazet
  • M Fagot
  • B Rumes
  • J M Russell
  • F Darius
  • Daniel Conley
  • M Schuster
  • H von Suchodoletz
  • D R Engstrom

Summary, in English

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.

Avdelning/ar

  • Kvartärgeologi

Publiceringsår

2008

Språk

Engelska

Sidor

765-768

Publikation/Tidskrift/Serie

Science

Volym

320

Issue

5877

Dokumenttyp

Artikel i tidskrift

Förlag

American Association for the Advancement of Science (AAAS)

Ämne

  • Geology

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 1095-9203