CGRG Bibliography of Canadian Geomorphology
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Author : Dallimore, A.; Thomson, R.; and Enkin, R.J.
Date : 2009.
Title : Reconstruction of cyclical and abrupt changes in northeastern Pacific precipitation during the Late Holocene based on marine sediments preserved in Effingham Inlet, British Columbia.
Publication : 2009 American Geophysical Union Fall Meeting. December 14-18, 2009. San Francisco, California, USA.
Issue :
Page(s) :
Abstract
Accurate interpretation of paleoenvironmental time series requires the reliable chronological control now provided by an age-model of a 40 m long marine sediment core raised from Effingham Inlet in Barkley Sound, British Columbia in 2002 (Core MD02-2494). The Late-Pleistocene to Holocene age model provides detailed annual to decadal resolution of the timing of proxy paleoenvironmental indicators preserved in the core based on 46 radiocarbon dates and the presence of the Mazama Ash. Also determined is the timing of instantaneous depositional events related to seismic activity along the Cascadia subduction zone. A frequency-time analysis of the grey scale of sediment x-rays from the calibrated core, which represent the volume and timing of precipitation events in area over the past 6,000 years, show cyclical as well as abrupt “regime change” controls on the northeast Pacific and climate system. This time series, combined with a time series derived from the core using a geochemical reconstruction of Pacific decadal variability, now provide a quantitative means of comparing the marine paleoenvironmental record of ocean and climate conditions of the B.C. coast to other time series of Holocene northeastern Pacific paleoenvironmental indicators.
Bibliography of Canadian Geomorphology