HR: 14:00h
AN: C13C-02    [Abstracts]
TI: Late-Quaternary Climate Change Within the Beringian Buckle: Multidisciplinary Results From St. Michael Island
AU: * Cwynar, L C
EM: cwynar@unb.ca
AF: Dept. Biology, University of New Brunswick, 10 Bailey Drive, Fredericton, NB E3B 6E1 Canada
AU: Ager, T A
AF: US Geological Survey, Mail Stop 980, Box 25046 Denver Federal Center, Denver, CO 80225 United States
AU: Barley, E
AF: Okanagan University College, 3333 University Way, Kelowna, BC V1V 1V7 Canada
AU: Gajewski, K
AF: Dept. Geography, University of Ottawa, Ottawa, ON K1N 6N5 Canada
AU: Kurek, J
AF: Dept. Biology, University of New Brunswick, 10 Bailey Drive, Fredericton, NB E3B 6E1 Canada
AU: Pienitz, R
AF: Dept. Geography, Laval University, Pavillion Abitibi-Price, Quebec, QC G1K 7P4 Canada
AU: Racca, J
AF: Dept. Geography, Laval University, Pavillion Abitibi-Price, Quebec, QC G1K 7P4 Canada
AU: Sawada, M
AF: Dept. Geography, Laval University, Pavillion Abitibi-Price, Quebec, QC G1K 7P4 Canada
AU: Viau, A
AF: Dept. Geography, University of Ottawa, Ottawa, ON K1N 6N5 Canada
AU: Walker, I R
AF: Okanagan University College, 3333 University Way, Kelowna, BC V1V 1V7 Canada
AU: Whitmore, J
AF: Dept. Geography, University of Ottawa, Ottawa, ON K1N 6N5 Canada
AB: Zagoskin Lake is a 19 m deep maar beyond the limits of late Cenozoic glaciation that contains a 30,000 14C yr B.P. record of climate change. We quantitatively reconstructed the summer thermal regime using midge, diatom, and pollen data. Preliminary inferred mean July air temperatures based on the diatom and midge data show similar trends with LGM temperatures surprisingly similar to modern ones. In addition, both reach maximum values from about 11,000 to 9500 14C yr B.P. coincident with a peak of poplar pollen - a tree that does not occur on the island today. In contrast, the pollen-based reconstructions indicate a cold LGM relative to modern temperatures, a small peak in temperatures coincident with the poplar pollen peak, and then sustained high levels for most of the Holocene. Potential problems and how these differing records may be reconciled will be discussed.
DE: 9315 Arctic region
DE: 9604 Cenozoic
DE: 3309 Climatology (1620)
SC: Cryosphere [C]
MN: 2004 AGU Fall Meeting