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

Appleby, P. G.; Jones, V. J.; Ellis-Evans, J. C.. 1995 Radiometric dating of lake sediments from Signy Island (maritime Antarctic): evidence of recent climatic change. Journal of Paleolimnology, 13 (2). 179-191. 10.1007/BF00678106

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Abstract/Summary

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.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	10.1007/BF00678106
Programmes:	BAS Programmes > Pre 2000 programme
ISSN:	0921-2728
Additional Keywords:	maritime Antarctic, Signy Island, sediments, Pb-210, Cs-137, radionuclide, fluxes, climate change
Date made live:	06 Dec 2016 11:51 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/515395

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