HR: 0800h
AN: PP21B-1379    [Abstracts]
TI: Quantitative Reconstructions of Beringian Climates from Pollen Assemblages
AU: * Gajewski, K
EM: gajewski@uottawa.ca
AF: Laboratory for Paleoclimatology and Climatology, Department of Geography, University of Ottawa,60 University St., Ottawa, ON K1N 6N5 Canada
AU: Sawada, M C
EM: msawada@uottawa.ca
AF: Laboratory for Paleoclimatology and Climatology, Department of Geography, University of Ottawa,60 University St., Ottawa, ON K1N 6N5 Canada
AU: Viau, A E
EM: aviau@uottawa.ca
AF: Laboratory for Paleoclimatology and Climatology, Department of Geography, University of Ottawa,60 University St., Ottawa, ON K1N 6N5 Canada
AB: We reconstructed mean July temperature for the past 30 000 years at Zagoskin Lake (Ager. 2003. Quat Res 60:19) using the Modern Analogue Technique (MAT). Calibration was done using a dataset of 4549 modern pollen samples from across North America, with a pollen sum of 106 pollen taxa. Reconstructed temperatures show a cold full-glacial, warming in the late-glacial and early Holocene and a warm Holocene. Experimentation showed the results are robust with respect to various decisions that can be made in application of the method. Although many of the samples in the full-glacial could be considered non-analogue, the temperatures estimated are reasonable, and comparable to those estimated at samples that are considered analogue. Further, these samples are not greatly deviant when ordinated with modern samples from northern Canada and Alaska.
DE: 9350 North America
DE: 3344 Paleoclimatology
DE: 1600 GLOBAL CHANGE (New category)
DE: 1620 Climate dynamics (3309)
SC: Paleoceanography and Paleoclimatology [PP]
MN: 2004 AGU Fall Meeting