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Radiometric dating of lake sediments from Signy Island (maritime Antarctic): evidence of recent climatic change

descriptionPublicationkeyboard_double_arrow_right Article , Journal 01 Mar 1995 United Kingdom Publisher:Springer Science and Business Media LLCJournal:Journal of Paleolimnology, volume 13, pages 179-191 (issn: 0921-2728, eissn: 1573-0417,

Authors: Appleby, P. G.; Jones, V. J.; Ellis-Evans, J. C.;

doi: 10.1007/bf00678106

Radiometric dating of lake sediments from Signy Island (maritime Antarctic): evidence of recent climatic change

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Abstract

Sediment cores from three lakes (Moss, Sombre and Heywood) in the maritime Antarctic (Signy Island, South Orkney Islands) have been successfully dated radiometrically by210Pb and137Cs. The core inventories of both fallout radionuclides are an order of magnitude higher than that which can be supported by the direct atmospheric flux at this latitude. The elevated values may be explained by fallout onto the catchment during the winter being delivered directly to the lakes during the annual thaw. Two of the lakes (Sombre and Heywood) show marked increases in sediment accumulation afterc. 1950. This appears to be associated with a documented rise in temperature in the South Orkney Islands, which has caused extensive deglaciation at Signy Island.

Country

United Kingdom

Related Organizations

University College London
United Kingdom
British Antarctic Survey
United Kingdom
University of Liverpool
United Kingdom
Natural Environment Research Council
United Kingdom
British Antarctic Survey
United Kingdom

Keywords

maritime Antarctic, sediments, Pb-210, fluxes, climate change, Cs-137, Signy Island, radionuclide

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