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Pollen-Derived Rainfall and Temperature Estimates from Lake Tanganyika and Their Implication for Late Pleistocene Water Levels

Published online by Cambridge University Press:  20 January 2017

Annie Vincens ,
Françoise Chalié ,
Raymonde Bonnefille ,
Joel Guiot  and
Jean-Jacques Tiercelin
Annie Vincens
Affiliation:
Géologie du Quaternaire, CNRS Case 907, 13288 Marseille Cedex 9, France Botanique Historique et Palynologie, St Jérôme, 13397 Marseille Cedex 13, France URA 1278 "Domaines Océaniques," Université de Bretagne Occidentale, UFR Sciences et Techniques, B.P. 452, 29275 Brest Cedex, France
Françoise Chalié
Affiliation:
Géologie du Quaternaire, CNRS Case 907, 13288 Marseille Cedex 9, France Botanique Historique et Palynologie, St Jérôme, 13397 Marseille Cedex 13, France URA 1278 "Domaines Océaniques," Université de Bretagne Occidentale, UFR Sciences et Techniques, B.P. 452, 29275 Brest Cedex, France
Raymonde Bonnefille
Affiliation:
Géologie du Quaternaire, CNRS Case 907, 13288 Marseille Cedex 9, France Botanique Historique et Palynologie, St Jérôme, 13397 Marseille Cedex 13, France URA 1278 "Domaines Océaniques," Université de Bretagne Occidentale, UFR Sciences et Techniques, B.P. 452, 29275 Brest Cedex, France
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Abstract

Palaeoclimatic estimates of mean annual temperature and rainfall in the southern Tanganyika basin between 25,000 and 9000 yr B.P. have been established from two pollen sequences based on the best-analogue method. The results give evidence of a mean temperature decrease of about 4.2°C during the last glaciation, a value consistent with that previously obtained in the catchment area on the Burundi Highlands. This cooling was synchronous with a decrease of mean annual precipitation of about 180 mm/yr. Postglacial climatic conditions were established by 12,700 yr B.P., with warming and wetness continuing to increase from this date onward. These new palaeoclimatic data will be useful for hydrological reconstructions of Lake Tanganyika, particularly during the last glacial age for which the magnitude of water-level fall has been a controversial issue; our rainfall estimates are more consistent with low values (-250 to -300 m fall) than with high ones (-600 m) previously proposed.

Type
Research Article
Information
Quaternary Research , Volume 40 , Issue 3 , November 1993 , pp. 343 - 350
Copyright
University of Washington

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