HR: 0800h
AN: PP21A-1372    [Abstracts]
TI: A High-Resolution Record of Holocene Climate Variability from a Western Canadian Coastal Inlet
AU: * Dallimore, A
EM: audrey.dallimore@nrcan.gc.ca
AF: Geological Survey of Canada-Pacific, Institute of Ocean Sciences 9860 West Saanich Road, Sidney, B.C V8L 4B2 Canada
AU: Thomson, R E
EM: ThomsonR@pac.dfo-mpo.gc.ca
AF: Department of Fisheries and Oceans-Canada, Institute of Ocean Sciences 9860 West Saanich Road, Sidney, B.C V8L 4B2 Canada
AU: Enkin, R J
EM: REnkin@nrcan.gc.ca
AF: Geological Survey of Canada-Pacific, Institute of Ocean Sciences 9860 West Saanich Road, Sidney, B.C V8L 4B2 Canada
AU: Kulikov, E A
EM: kulikove@pac.dfo-mpo.gc.ca
AF: PP. Shirshov Institute of Oceanology, c/o Institute of Ocean Sciences 9860 West Saanich Road, Sidney, B.C V8L 4B2 Canada
AU: Bertram, M A
EM: mbertram@ocean.washington.edu
AF: PMEL/NOAA, 7600 Sand Point Way, N.E., Seattle, WA 98115-0070 United States
AU: Wright, C A
EM: WrightCy@pac.dfo-mpo.gc.ca
AF: Department of Fisheries and Oceans-Canada, Institute of Ocean Sciences 9860 West Saanich Road, Sidney, B.C V8L 4B2 Canada
AU: Southon, J R
EM: jsouthon@uci.edu
AF: University of California-Irvine, Earth System Science Department 3200 Croul Hall University of California, Irvine, CA 92697-3100 United States
AU: Barrie, J V
EM: vbarrie@nrcan.gc.ca
AF: Geological Survey of Canada-Pacific, Institute of Ocean Sciences 9860 West Saanich Road, Sidney, B.C V8L 4B2 Canada
AU: Baker, J
EM: jubaker@nrcan.gc.ca
AF: Geological Survey of Canada-Pacific, Institute of Ocean Sciences 9860 West Saanich Road, Sidney, B.C V8L 4B2 Canada
AU: Pienitz, R
EM: reinhard.pienitz@cen.ulaval.ca
AF: Universite Laval, Departement de Geographie Universite Laval, Quebec, QUE G1K 7P4 Canada
AU: Calvert, S E
EM: calvert@eos.ubc.ca
AF: University of British Columbia, Earth and Ocean Sciences University of British Columbia, Vancouver, B.C V6T 1Z4 Canada
AU: Chang, A S
EM: asm_chang@yahoo.com
AF: University of Victoria, School of Earth and Ocean Sciences University of Victoria, Victoria, B.C V8W 3P6 Canada
AU: Pedersen, T F
EM: sciedean@uvic.ca
AF: University of Victoria, Elliott 166 PO Box 3055 STN CSC University of Victoria, Victoria, BC V8W 3P6 Canada
AB: Conditions within the Pacific Ocean have a major effect on the climate of northwestern North America. High resolution records of present and past northeast Pacific climate are revealed in our multi-disciplinary study of annually laminated marine sediments from anoxic coastal inlets of British Columbia. Past climate conditions for the entire Holocene are recorded in the sediment record contained in a 40 meter, annually laminated marine sediment core taken in Effingham Inlet, on the west coast of Vancouver Island, British Columbia, from the French ship the Marion Dufresne, as part of the international IMAGES program. By combining our eight year continuous instrument record of modern coastal ocean dynamics and climate with high-resolution analysis of depositional processes, we have been able to develop proxy measurements of past climatic and oceanographic changes on annual to millennial time scales. Results indicate that regional climate has oscillated on a variety of time scales throughout the Holocene. At times, climatic change has been dramatically rapid. We are also developing digital methods for statistical time-series analyses of physical sediment properties through the Holocene in order to obtain a more objective quantitative approach for detecting cyclicity in our data. Results of the time series analysis of lamination thickness reveals statistically significant spectral peaks of climate scale variability at established decadal to century time scales. These in turn may be related to solar cycles and quasi-cyclical ocean processes such as the Pacific Decadal Oscillation. However, the annually laminated time series are periodically interrupted by massive mud intervals which are related to bottom currents and at times paleo-seismic events, illustrating the need for a full understanding of modern oceanographic and sedimentation processes, so an accurate proxy record of past climate can be established.
DE: 4203 Analytical modeling
DE: 4215 Climate and interannual variability (3309)
DE: 4267 Paleoceanography
DE: 3022 Marine sediments--processes and transport
DE: 3309 Climatology (1620)
SC: Paleoceanography and Paleoclimatology [PP]
MN: 2004 AGU Fall Meeting