A High-Resolution Paleoclimate Record Spanning the Past 25,000 Years in Southern East Africa-Reference-Cited by-同舟云学术

A High-Resolution Paleoclimate Record Spanning the Past 25,000 Years in Southern East Africa

Published:2002-04-05 Issue:5565 Volume:296 Page:113-132
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Johnson Thomas C.¹,Brown Erik T.¹,McManus James¹,Barry Sylvia¹,Barker Philip²,Gasse Françoise³

Affiliation:

1. Large Lakes Observatory, University of Minnesota Duluth, Duluth, MN 55812, USA.

2. Department of Geography, Lancaster University, Lancaster LA1 4YB, UK.

3. Centre Européen de Recherche et d'Enseignement en Géosciences de l'Environnement, Centre National de la Recherche Scientifique, Universitéd'Aix-Marseille III, BP 80, 13545 Aix-en-Provence, Cedex 04, France.

Abstract

High-resolution profiles of the mass accumulation rate of biogenic silica and other geochemical proxies in two piston cores from northern Lake Malawi provide a climate signal for this part of tropical Africa spanning the past 25,000 years. The biogenic silica mass accumulation rate was low during the relatively dry late Pleistocene, when the river flux of silica to the lake was suppressed. Millennial-scale fluctuations, due to upwelling intensity, in the late Pleistocene climate of the Lake Malawi basin appear to have been closely linked to the Northern Hemisphere climate until 11 thousand years ago. Relatively cold conditions in the Northern Hemisphere coincided with more frequent north winds over the Malawi basin, perhaps resulting from a more southward migration of the Intertropical Convergence Zone.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Reference27 articles.

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3. All six piston cores were analyzed for magnetic susceptibility using a Geotek Multi-Sensor Core Logger (Northamptonshire UK). Water content and total organic carbon were determined at 10-cm intervals down each core by weight loss after drying and coulometry respectively. Stratigraphic correlations were established among the cores and were based on sedimentary structures magnetic susceptibility and percent abundance of BSI: The cores contain an upper varved interval that averages about a meter in thickness overlying an interval that is about 2.5-m thick consisting of alternating packets of varved and nonvarved sediments. The varves in both intervals are about 0.5- to 0.7-mm thick and the packets are typically about 2- to 8-cm thick. These overlie another continuously varved interval that spans about 1.2 to 2 m which in turn overlies a second interval of alternating packets of varves and nonvarved sediment of about a meter thickness. The bottom unit in the cores is a homogenous silty clay up to 3-m thick.

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