HR: 1340h
AN: U13B-1149    [Abstracts]
TI: Holocene paleoclimates of Canada north of 50°: Comparison with high-resolution multi-proxy records
AU: * Viau, A E
EM: aviau@uottawa.ca
AF: Laboratory for Paleoclimatology and Climatology,University of Ottawa, 60 University Avenue, Ottawa, ON K1N 6N5, Canada
AU: Gajewski, K
EM: gajewski@uottawa.ca
AF: Laboratory for Paleoclimatology and Climatology,University of Ottawa, 60 University Avenue, Ottawa, ON K1N 6N5, Canada
AB: High-latitude regions are naturally more sensitive to climate perturbations due in part to strong surface albedo feedback. In this study, we use a large network of modern and fossil pollen data to investigate climate variability above 50°N in North America during the past 12,000 years. Climate variables such as July and January, and annual precipitations are reconstructed at 100-year intervals to evaluate climate variability at several temporal and spatial scales. Results show both low and high frequency climate variability occurring throughout the Holocene. Climatologically reasonable space-time patterns are presented. Estimates of the range of climate variability on time scales of 104 and 103 compare well with high-resolution continental to hemispheric scale temperature reconstructions using multiple proxy records. High-latitude reconstructions show slightly higher sensitivity compared to lower mid-latitude reconstructions. Recent observed regional warming is unprecedented in terms of millennial-scale temperature variability found during the Holocene.
DE: 1600 GLOBAL CHANGE
DE: 1616 Climate variability (1635, 3305, 3309, 4215, 4513)
DE: 1637 Regional climate change
SC: Union [U]
MN: 2007 Fall Meeting