HR: 1340h
AN: PP23A-1390    [Abstracts]
TI: Large Temperature Variability in a Southern Tropical Continental Setting Through the Last Glacial Maximum
AU: Powers, L A
EM: powe0285@umn.edu
AF: Large Lakes Observatory, University of Minnesota Duluth, 10 University Drive, Duluth, MN 55812 United States
AU: Johnson, T C
EM: tcj@d.umn.edu
AF: Large Lakes Observatory, University of Minnesota Duluth, 10 University Drive, Duluth, MN 55812 United States
AU: * Werne, J P
EM: jwerne@d.umn.edu
AF: Large Lakes Observatory, University of Minnesota Duluth, 10 University Drive, Duluth, MN 55812 United States
AU: Castaneda, I S
EM: cast0150@umn.edu
AF: Large Lakes Observatory, University of Minnesota Duluth, 10 University Drive, Duluth, MN 55812 United States
AU: Hopmans, E C
EM: hopmans@nioz.nl
AF: Royal Netherlands Institute for Sea Research, Department of Marine Biogeochemistry and Toxicology, P.O. Box 59, Den Burg, Tex 1790 AB Netherlands
AU: Damst${e}'$, J S
EM: damste@nioz.nl
AF: Royal Netherlands Institute for Sea Research, Department of Marine Biogeochemistry and Toxicology, P.O. Box 59, Den Burg, Tex 1790 AB Netherlands
AU: Schouten, S
EM: schouten@nioz.nl
AF: Royal Netherlands Institute for Sea Research, Department of Marine Biogeochemistry and Toxicology, P.O. Box 59, Den Burg, Tex 1790 AB Netherlands
AB: The magnitude and timing of temperature change since the Last Glacial Maximum (LGM) on the tropical continents is becoming better understood as the box of independent paleotemperature tools for continental systems expands. Here we present a paleotemperature record derived from the application of TEX$_{86}$ to lacustrine sediments for Lake Malawi, East Africa through the LGM. We find a $\sim$4 $\deg$C overall warming since the LGM, with temperature reversals of more than 2 $\deg$C during the Younger Dryas (12.5 ka BP) and in the early Holocene. The warmest Holocene temperatures in this part of Africa appear to have occurred around 5000 years ago. The onset of warming in the Lake Malawi basin coincides with the BYRD oxygen isotope record of warming in Antarctica. While the range of temperatures observed in this study is not surprising, the timing of post-glacial warming, the thermal response to the YD, and the Holocene history of warming and cooling trends are providing important new insights into tropical climate dynamics on centennial to millennial scales.
DE: 4239 Limnology
DE: 4267 Paleoceanography
DE: 3309 Climatology (1620)
DE: 1055 Organic geochemistry
SC: Paleoceanography and Paleoclimatology [PP]
MN: 2004 AGU Fall Meeting