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

Research output: Contribution to journalJournal article

Published

Journal publication date1/04/2002
JournalScience
Volume296
Number of pages20
Pages113-132
Original languageEnglish

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.

Bibliographic note

The Malawi drilling project was led by Johnson (Minnesota) who obtained the NSF funding. Barker and Gasse(Aix-en-Provence) produced and interpreted the diatom data. Barker contributed to the palaeoclimate implications of these data that were pivotal to the reconstruction. RAE_import_type : Journal article RAE_uoa_type : Earth Systems and Environmental Sciences