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Western Canadian glaciers advance in concert with climate change circa 4.2 ka
Natural Resources and Environmental Studies Institute and Geography Program, University of Northern British Columbia, Prince George, British Columbia, Canada
Department of Earth Sciences, Simon Fraser University, Burnaby, British Columbia, Canada
Department of Geoscience, University of Calgary, Calgary, Alberta, Canada
Department of Geography, University of Western Ontario, London, Ontario, Canada
Department of Earth Sciences, Simon Fraser University, Burnaby, British Columbia, Canada
Department of Geoscience, University of Calgary, Calgary, Alberta, Canada
Disparate climate proxies from the Northern Hemisphere record a climate event at 4.2–3.8 ka. Here we show that glaciers throughout the mountain ranges of western Canada advanced at about this time. This conclusion is based on (1) new and previously reported radiocarbon ages on in situ stumps, logs, branches, and soils exposed by recent retreat in glacier forefields and (2) clastic-rich sediment intervals in cores retrieved from four montane lakes. These glacier and lacustrine data indicate a period of several decades to century length when climate conditions (cool summers, wet winters or both) favoured glacier nourishment and advance across western Canada.
Received 3 January 2008; accepted 5 March 2008; published 4 April 2008.
Citation: (2008), Western Canadian glaciers advance in concert with climate change circa 4.2 ka, Geophys. Res. Lett., 35, L07501, doi:10.1029/2008GL033172.
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