Mid-Holocene pulse of thinning in the Weddell Sea sector of the West Antarctic ice sheet

Hein, Andrew, Marrero, Shasta, Woodward, John, Dunning, Stuart, Winter, Kate, Westoby, Matt, Freeman, Stewart, Shanks, Richard and Sugden, David (2016) Mid-Holocene pulse of thinning in the Weddell Sea sector of the West Antarctic ice sheet. Nature Communications, 7. p. 12511. ISSN 2041-1723

[img]
Preview
Text (Article)
NatCommsHoloceneProofs.pdf - Accepted Version

Download (2MB) | Preview
[img]
Preview
Text (Article)
ncomms12511.pdf - Published Version
Available under License Creative Commons Attribution 4.0.

Download (1MB) | Preview
Official URL: http://dx.doi.org/10.1038/ncomms12511

Abstract

Establishing the trajectory of thinning of the West Antarctic ice sheet (WAIS) since the last glacial maximum (LGM) is important for addressing questions concerning ice sheet (in)stability and changes in global sea level. Here we present detailed geomorphological and cosmogenic nuclide data from the southern Ellsworth Mountains in the heart of the Weddell Sea embayment that suggest the ice sheet, nourished by increased snowfall until the early Holocene, was close to its LGM thickness at 10 ka. A pulse of rapid thinning caused the ice elevation to fall ~400 m to the present level at 6.5–3.5 ka, and could have contributed 1.4–2 m to global sea-level rise. These results imply that the Weddell Sea sector of the WAIS contributed little to late-glacial pulses in sea-level rise but was involved in mid-Holocene rises. The stepped decline is argued to reflect marine downdraw triggered by grounding line retreat into Hercules Inlet.

Item Type: Article
Subjects: F800 Physical and Terrestrial Geographical and Environmental Sciences
Department: Faculties > Engineering and Environment > Geography and Environmental Sciences
Depositing User: Ay Okpokam
Date Deposited: 22 Aug 2016 10:56
Last Modified: 23 Oct 2017 01:09
URI: http://nrl.northumbria.ac.uk/id/eprint/27602

Actions (login required)

View Item View Item

Downloads

Downloads per month over past year

View more statistics


Policies: NRL Policies | NRL University Deposit Policy | NRL Deposit Licence