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Please use this identifier to cite or link to this item: http://hdl.handle.net/1893/3661

Appears in Collections:Biological and Environmental Sciences Journal Articles
Peer Review Status: Refereed
Title: Influence of Patagonian glaciers on Antarctic dust deposition during the last glacial period
Author(s): Sugden, David E
McCulloch, Robert
Bory, Aloys J M
Hein, Andrew S
Contact Email: robert.mcculloch@stir.ac.uk
Keywords: Antarctic dust
Patagonia
Last glaciation
Issue Date: Apr-2009
Publisher: Nature Publishing Group / Macmillan Publishers Limited
Citation: Sugden DE, McCulloch R, Bory AJM & Hein AS (2009) Influence of Patagonian glaciers on Antarctic dust deposition during the last glacial period, Nature Geoscience, 2 (4), pp. 281-285.
Abstract: Dust in the atmosphere plays a role in the transparency of the atmosphere1, the mineral nourishment of the oceans and can be used to constrain global circulation models today and in the past. Antarctic ice cores provide an 800,000 year record of changes in dust flux thought to reflect changes in the vigour of global atmospheric circulation and environmental conditions in source areas. Here for the first time we link the source of Last Glacial dust peaks in Antarctica to the gravel outwash plains of Patagonian glaciers in the Magellan area of southernmost South America. We find that there is an on-off switch in that the peaks coincide with episodes when glaciers discharge sediment directly onto outwash plains but not when they terminate in lakes. This finding helps solve several long-standing puzzles, namely: why both dust and fresh water diatom concentrations during glacial maxima are so much higher (x ~20) than at the present day; why dust peaks occur only below a certain temperature threshold; and why the decline in dust concentrations at the end of glacial cycles precedes the main phase of warming, the rise in sea level, and the reduction in southern hemisphere sea ice extent.
Type: Journal Article
URI: http://hdl.handle.net/1893/3661
URL: http://www.nature.com/ngeo/journal/v2/n4/full/ngeo474.html
DOI Link: http://dx.doi.org/10.1038/ngeo474
Rights: Published in Nature Geoscience by Nature Publishing Group / Macmillan Publishers Limited. doi:10.1038/ngeo474.
Affiliation: University of Edinburgh
Biological and Environmental Sciences
British Antarctic Survey
University of Edinburgh

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