38 Lakes as Sentinels for Climate Change: Monitoring and Sedimentary Records at the Junction of Paleo and Modern Limnology (Posters)
Tuesday, 19 March 2013
8:00 AM - 12:00 PM
Grand Ballroom South
VARVE THICKNESS RECORDS FROM EASTERN NORTH AMERICA
Paper number: 38-2
Program: Theme Sessions
Time: 8:00 AM – 12:00 PM
Authors
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Nathalie PaquetteOttawa, ON
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Karelle Lafontaine-BoyerUniversity of Ottawa, Ottawa, ON
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Konrad GajewskiUniversity of Ottawa, Ottawa, ON
Abstract
Lakes containing varved sediments are used in paleoecological studies because they provide accurate chronologies, more so than from sequences dated radiometrically. A series of lakes have been analyzed to investigate the late Holocene vegetation history of eastern North America at high temporal resolution and the varve thicknesses measured in order to compute pollen influx. In this study, we analyse the varve thickness records to determine scales of temporal variability in sediment deposition. Each series consists of the total varve thickness of 10-year intervals, and the series span the past 1000-2000 years. Seven Lakes, from North Eastern United-States and Eastern Canada (Conroy Lake and Basin Pond – Maine; Clear Pond – NY; Lac Noir and Lac Brulé – southern Quebec; Ely Lake - Pa; Hells Kitchen Lake - Wi) were available. Multi-decadal to century-scale variability is observed, but the results do not seem to be coherent between sites.