Boex, J and Fogwill, C and Harrison, S and Glasser, NF and Hein, A and Schnabel, C and Xu, S (2013) Rapid thinning of the Late Pleistocene Patagonian Ice Sheet followed migration of the Southern Westerlies. Scientific Reports, 3. 2118 -?. ISSN 2045-2322

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Abstract

Here we present the first reconstruction of vertical ice-sheet profile changes from any of the Southern Hemisphere's mid-latitude Pleistocene ice sheets. We use cosmogenic radio-nuclide (CRN) exposure analysis to record the decay of the former Patagonian Ice Sheet (PIS) from the Last Glacial Maximum (LGM) and into the late glacial. Our samples, from mountains along an east-west transect to the east of the present North Patagonian Icefield (NPI), serve as 'dipsticks' that allow us to reconstruct past changes in ice-sheet thickness, and demonstrates that the former PIS remained extensive and close to its LGM extent in this region until ~19.0 ka. After this time rapid ice-sheet thinning, initiated at ~18.1 ka, saw ice at or near its present dimension by 15.5 ka. We argue this rapid thinning was triggered by a combination of the rapid southward migration of the precipitation bearing Southern Hemisphere (SH) westerlies and regional warming.

Item Type: Article
Additional Information: This is the final published version of the article (version of record). It first appeared online via Nature Publishing Group at http://dx.doi.org/10.1038/srep02118 - please refer to any applicable terms of use of the publisher.
Subjects: G Geography. Anthropology. Recreation > GB Physical geography
Divisions: Faculty of Natural Sciences > School of Geography, Geology and the Environment
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Depositing User: Symplectic
Date Deposited: 21 Sep 2017 09:56
Last Modified: 21 Sep 2017 12:58
URI: http://eprints.keele.ac.uk/id/eprint/4033

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