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The Holocene
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Environmental reconstruction from a varve network in the southern Coast Mountains, British Columbia, Canada

Brian Menounos

Geography Program, University of Northern British Columbia, 3333 University Way, Prince George BC V2N 4Z9, Canada; menounos{at}unbc.ca

John J. Clague

Department of Earth Sciences, Simon Fraser University, 8888 University Drive, Burnaby BC V5A 1S6, Canada

Robert Gilbert

Department of Geography, Queen's University, Kingston ON K7L 3N6, Canada

Olav Slaymaker

Department of Geography, University of British Columbia, 1984 West Mall, #217, Vancouver BC V6TIZ2, Canada

Cores of annually laminated sediments (varves) from five lakes in the southern Coast Mountains of British Columbia, Canada, document clastic sediment response to climate and geomorphic change over the past 120 years. Interannual varve thickness correlates with annual flood magnitude. Interdecadal trends in varve thickness are influenced by other environmental factors such as glacier recession. Despite major differences in the lakes and their contributing watersheds, substantial concordance is observed among the records. A pronounced change in the nature of lake sedimentation, accompanied by higher interannual variability, occurred in 1980. The change coincides with an increase in the magnitude of autumn flooding and major re-organization of the North Pacific climate system. These results highlight new directions for palaeoenvironmental research using varved sediment records, specifically to study the magnitude and spatial extent of past hydro-climatic events.

Key Words: Varves • lake sediments • glacier retreat • floods • environmental change • interannual variability • hydroclimatology • British Columbia • Canada

The Holocene, Vol. 15, No. 8, 1163-1171 (2005)
DOI: 10.1191/0959683605hl888rp
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