Tom Bradwell
Ice-stream demise dynamically conditioned by trough shape and bed strength
Bradwell, Tom; Small, David; Fabel, Derek; Smedley, Rachel K.; Clark, Chris C.; Saher, Margot H.; Callard, S. Louise; Chiverrell, Richard C.; Dove, Dayton; Moreton, Steven G.; Roberts, David H.; Duller, Geoff A.T.; Ó Cofaigh, Colm
Authors
Dr David Small david.p.small@durham.ac.uk
Assistant Professor
Derek Fabel
Rachel K. Smedley
Chris C. Clark
Margot H. Saher
S. Louise Callard
Richard C. Chiverrell
Dayton Dove
Steven G. Moreton
Professor Dave Roberts d.h.roberts@durham.ac.uk
Professor
Geoff A.T. Duller
Professor Colm O'Cofaigh colm.ocofaigh@durham.ac.uk
Head Of Department
Abstract
Ice sheet mass loss is currently dominated by fast-flowing glaciers (ice streams) terminating in the ocean as ice shelves and resting on beds below sea level. The factors controlling ice-stream flow and retreat over longer time scales (>100 years), especially the role of three-dimensional bed shape and bed strength, remain major uncertainties. We focus on a former ice stream where trough shape and bed substrate are known, or can be defined, to reconstruct ice-stream retreat history and grounding-line movements over 15 millennia since the Last Glacial Maximum. We identify a major behavioral step change around 18,500 to 16,000 years ago—out of tune with external forcing factors—associated with the collapse of floating ice sectors and rapid ice-front retreat. We attribute this step change to a marked geological transition from a soft/weak bed to a hard/strong bed coincident with a change in trough geometry. Both these factors conditioned and ultimately hastened ice-stream demise.
Citation
Bradwell, T., Small, D., Fabel, D., Smedley, R. K., Clark, C. C., Saher, M. H., …Ó Cofaigh, C. (2019). Ice-stream demise dynamically conditioned by trough shape and bed strength. Science Advances, 5(4), Article eaau1380. https://doi.org/10.1126/sciadv.aau1380
Journal Article Type | Article |
---|---|
Acceptance Date | Mar 7, 2019 |
Online Publication Date | Apr 24, 2019 |
Publication Date | Apr 24, 2019 |
Deposit Date | Apr 30, 2019 |
Publicly Available Date | May 1, 2019 |
Journal | Science Advances |
Publisher | American Association for the Advancement of Science |
Peer Reviewed | Peer Reviewed |
Volume | 5 |
Issue | 4 |
Article Number | eaau1380 |
DOI | https://doi.org/10.1126/sciadv.aau1380 |
Public URL | https://durham-repository.worktribe.com/output/1302916 |
Publisher URL | https://advances.sciencemag.org/content/5/4/eaau1380 |
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Copyright Statement
Copyright © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).
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