Please use this identifier to cite or link to this item:
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:
Keywords: Antarctic dust
Last glaciation
Climate changing
Geology, Stratigraphic
Issue Date: Apr-2009
Date Deposited: 24-Feb-2012
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.
DOI Link: 10.1038/ngeo474
Rights: Published in Nature Geoscience by Nature Publishing Group / Macmillan Publishers Limited. doi:10.1038/ngeo474.

Files in This Item:
File Description SizeFormat 
SugdenetalNatureGeoscienceSTORREver.pdfFulltext - Accepted Version41.61 MBAdobe PDFView/Open

This item is protected by original copyright

Items in the Repository are protected by copyright, with all rights reserved, unless otherwise indicated.

The metadata of the records in the Repository are available under the CC0 public domain dedication: No Rights Reserved

If you believe that any material held in STORRE infringes copyright, please contact providing details and we will remove the Work from public display in STORRE and investigate your claim.