IGB

Connexion

(Article of periodic en Anglais - 1983)

Document title

Paleo-environmental perspectives on the Sahel drought of 1968-73 in Polar research.

Authors(s) and Affiliation(s)

BUTZER K. W. ;

Abstract

A review of stream, dune and lake phenomena in several well-studied sectors of the Sahel indicates an informative record of repeated environmental change. Blowing sand encroached far into the now semi-arid savanna between approximately 20,000 and 12,500 years ago, while lakes had substantially greater volumes and rivers higher discharges between 9000 and 5000 years ago. But rapid change and high-amplitude variability have always been the rule. During the last 2500 years conditions fluctuated about the modern median, with strong short and medium-term oscillations. The Sahel drought after 1968 falls within the norm of at least 6 earlier, dry anomalies verified since 1400 AD. Whether or not the coincidence of cumulative overgrazing and population pressure with severe drought has triggered a geomorphologic response that is unique in the record, can only be decided after much more systematic work has been carried out. (Ed.).

Source

Article of periodic

published at : Geojournal. International journal for physical, biological and human geosciences and their application in environmental planning and ecology Wiesbaden

Editor :

Millesime : 1983, vol. 7, no4 [pp. 369-374]

Bibliographic references : 27 réf.

Language

Anglais

Refdoc record number (ud4) : 12364799 : Permanent link - XML version
Powered by Pxxo