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Publication Detail
Drought and dust deposition in the West African Sahel: A 5500-year record from Kajemarum Oasis, northeastern Nigeria
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Journal Article
  • Authors:
    Street-Perrott FA, Holmes JA, Waller MP, Allen MJ, Barber NGH, Fothergill PA, Harkness DD, Ivanovich M, Kroon D, Perrott RA
  • Publication date:
    01/01/2000
  • Pagination:
    293, 302
  • Journal:
    Holocene
  • Volume:
    10
  • Issue:
    3
  • Status:
    Published
  • Print ISSN:
    0959-6836
Abstract
A high-resolution, multiproxy palaeolimnological record from the Manga Grasslands, northeastern Nigeria, spanning the last 5500 calendar years, reveals the episodic deterioration in Sahelian climate as significant biogeophysical thresholds were crossed. Desert-dust deposition began to increase ~4700 cal. BP. Rainfall during the summer-monsoon season declined permanently after 4100 cal. BP. A further significant change in atmospheric circulation, giving rise to multidecadal to centennial-scale droughts and enhanced dust deposition, occurred ~1500 cal. BP. Hence, the post-1968 Sahel drought is not unique. The prolonged arid episode that occurred around 1200-1000 cal. BP in Ethiopia, the Sahel and tropical Mexico may have been linked to an abrupt cooling event in the North Atlantic and to a cluster of intense El Nino-Southern Oscillation events in the Eastern Equatorial Pacific.
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