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Palaeohydrology of the southwest Yukon territory, Canada, based on multiproxy analyses of lake sediment cores from a depth transect

Anderson, Lesleigh, Abbott, Mark B., Finney, Bruce P. and Edwards, Mary E. (2005) Palaeohydrology of the southwest Yukon territory, Canada, based on multiproxy analyses of lake sediment cores from a depth transect The Holocene, 15, (8), pp. 1172-1183. (doi:10.1191/0959683605hl889rp).

Record type: Article

Abstract

Lake-level variations at Marcella Lake, a small, hydrologically closed lake in the southwestern Yukon Territory, document changes in effective moisture since the early Holocene. Former water levels, driven by regional palaeohydrology, were reconstructed by multiproxy analyses of sediment cores from four sites spanning shallow to deep water.Marcella Lake today is thermally stratified, being protected from wind by its position in a depression. It is alkaline and undergoes bio-induced calcification. Relative accumulations of calcium carbonate and organic matter at the sediment/water interface depend on the location of the depositional site relative to the thermocline. We relate lake-level fluctuations to down-core stratigraphic variations in composition, geochemistry, sedimentary structures and to the occurrence of unconformities in four cores based on observations of modern limnology and sedimentation processes. Twenty-four AMS radiocarbon dates on macrofossils and pollen provide the lake-level chronology. Prior to 10 000 cal. BP water levels were low, but then they rose to 3 to 4 m below modern levels. Between 7500 and 5000 cal. BP water levels were 5 to 6 m below modern but rose by 4000 cal. BP. Between 4000 and 2000 cal. BP they were higher than modern. During the last 2000 years, water levels were either near or 1 to 2 m below modern levels. Marcella Lake water-level fluctuations correspond with previously documented palaeoenvironmental and palaeoclimatic changes and provide new, independent effective moisture information. The improved geochronology and quantitative water-level estimates are a framework for more detailed studies in the southwest Yukon.

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Published date: 2005
Keywords: Lake-level, effective moisture, palaeoclimate, palaeolimnology, carbon isotopes, nitrogen isotopes, Yukon Territory, Canada, Holocene

Identifiers

Local EPrints ID: 55291
URI: http://eprints.soton.ac.uk/id/eprint/55291
ISSN: 0959-6836
PURE UUID: 2e607fb9-678f-474f-97a8-cb53e74ba6c6
ORCID for Mary E. Edwards: ORCID iD orcid.org/0000-0002-3490-6682

Catalogue record

Date deposited: 01 Aug 2008
Last modified: 17 Jul 2017 14:33

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Contributors

Author: Lesleigh Anderson
Author: Mark B. Abbott
Author: Bruce P. Finney
Author: Mary E. Edwards ORCID iD

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