HR: 0800h
AN: C41B-0196    [Abstracts]
TI: Past sea ice Variability Inferred From ice Cores: Development of a Transfer Function for the Canadian Arctic
AU: * Kinnard, C
EM: ckinn045@uottawa.ca
AF: Department of Geography, University of Ottawa, Simard Hall 047 60 University St , Ottawa, ON K1N 6N5 Canada
AU: Zdanowicz, C M
EM: czdanowi@nrcan.gc.ca
AF: Glaciology Section, Terrain Sciences Division, Geological Survey of Canada, 601 Booth Street, Ottawa, ON K1A 0E8 Canada
AU: Fisher, D A
EM: fisher@nrcan.gc.ca
AF: Glaciology Section, Terrain Sciences Division, Geological Survey of Canada, 601 Booth Street, Ottawa, ON K1A 0E8 Canada
AB: Recent studies have revealed that Arctic sea-ice cover is rapidly decreasing. Most studies were based on satellite observations spanning the last 30 years, while operational charts and historical observations, of less reliable quality and precision, have increased the record back to a hundred years. The observed changes have been shown to be non-homogenous in time and space, due to complex interactions between surface air temperature and the atmospheric and ocean circulation. It is therefore primordial to better understand these interactions in order to predict the response of the sea ice cover to future greenhouse warming. In this respect, there is a critical need for longer records of sea ice variability which would allow the discrimination of the anthropogenic influence on sea ice conditions from longer-term, natural variability. As a premise to the development of a 1000 year-long sea ice proxy record, this work explores the possible relationships between recent changes (1969-2002) in sea ice conditions in the Canadian Arctic and the glaciochemistry of ice cores from three Canadian sites: Agassiz ice cap (Ellesmere Island), Devon ice cap, (Devon Island) and Penny ice cap (Baffin Island).
DE: 3344 Paleoclimatology
SC: Cryosphere [C]
MN: 2004 AGU Fall Meeting