2003 Seattle Annual Meeting (November 25, 2003)
Paper No. 17-13
Presentation Time: 11:15 AM-11:30 AM

THE LAKE MALAWI CLIMATE RECORD: LINKS TO SOUTH AMERICA

BROWN, Erik T. and JOHNSON, Thomas C., Large Lakes Observatory, Univ of Minnesota, Duluth, MN 55812, etbrown@d.umn.edu

We have extracted high resolution records of past climate conditions from varved sediments accumulating near 10o S in the north basin of Lake Malawi, the southernmost of the East African Rift lakes. Here we compare profiles of biogenic silica and Nb:Ti spanning nearly 25,000 years in Malawi with the Cariaco Basin high-resolution record of Haug et al. (2001), which is based primarily on sedimentary profiles of Fe and Ti. During the past 1000 years Nb:Ti and biogenic silica track one another in Malawi sediments, as observed for the Late Glacial (Johnson et al., 2002). These signals have been interpreted as a reflection of the intensity or frequency of north winds over the basin. Such winds carry Nb-rich volcaniclastic sediments into the lake and promote upwelling, favorable to diatom productivity. Johnson et al. (2002) attributed the greater frequency of north winds over the Malawi basin during "cold" episodes such as the Younger Dryas to southward shifts in the Intertropical Convergence Zone (ITCZ). Haug et al. (2001) have suggested that southward migration of the ITCZ over South America as such times caused decreased rainfall and delivery of terrigenous clastics rich in Fe and Ti to the Cariaco basin. During the Late Glacial, the trends in the African and South American records are remarkably similar. In addition, they both show evidence for the ITCZ being positioned more to the north during the Medieval Warm Period, more to the south during the Little Ice Age, and subsequently returning to the north. Both records also exhibit greater variability during the LIA, with distinct southerly ITCZ excursions. Twentieth Century climate records indicate that episodes of enhanced north winds over Malawi were dry over the Orinoco basin, suggesting that the mechanism of teleconnection developed from sedimentary evidence for 100 to 10,000 years timescales may also play a role in the modern climate.

2003 Seattle Annual Meeting (November 25, 2003)
Session No. 17
Lakes and Holocene Environmental Change: The Use of Multiproxy Lake Records for Paleoclimate Reconstructions I
Washington State Convention and Trade Center: 307/308
8:00 AM-12:00 PM, Sunday, November 2, 2003

Geological Society of America Abstracts with Programs, Vol. 35, No. 6, September 2003, p. 62

© Copyright 2003 The Geological Society of America (GSA), all rights reserved. Permission is hereby granted to the author(s) of this abstract to reproduce and distribute it freely, for noncommercial purposes. Permission is hereby granted to any individual scientist to download a single copy of this electronic file and reproduce up to 20 paper copies for noncommercial purposes advancing science and education, including classroom use, providing all reproductions include the complete content shown here, including the author information. All other forms of reproduction and/or transmittal are prohibited without written permission from GSA Copyright Permissions.