Scott Braddock
Relative sea-level data preclude major late Holocene ice-mass change in Pine Island Bay
Braddock, Scott; Hall, Brenda L.; Johnson, Joanne S.; Balco, Greg; Spoth, Meghan; Whitehouse, Pippa L.; Campbell, Seth; Goehring, Brent M.; Rood, Dylan H.; Woodward, John
Authors
Brenda L. Hall
Joanne S. Johnson
Greg Balco
Meghan Spoth
Philippa Whitehouse pippa.whitehouse@durham.ac.uk
Honorary Professor
Seth Campbell
Brent M. Goehring
Dylan H. Rood
John Woodward
Abstract
The rapidly retreating Thwaites and Pine Island glaciers together dominate present-day ice loss from the West Antarctic Ice Sheet and are implicated in runaway deglaciation scenarios. Knowledge of whether these glaciers were substantially smaller in the mid-Holocene and subsequently recovered to their present extents is important for assessing whether current ice recession is irreversible. Here we reconstruct relative sea-level change from radiocarbon-dated raised beaches at sites immediately seawards of these glaciers, allowing us to examine the response of the earth to loading and unloading of ice in the Amundsen Sea region. We find that relative sea level fell steadily over the past 5.5 kyr without rate changes that would characterize large-scale ice re-expansion. Moreover, current bedrock uplift rates are an order of magnitude greater than the rate of long-term relative sea-level fall, suggesting a change in regional crustal unloading and implying that the present deglaciation may be unprecedented in the past ~5.5 kyr. While we cannot preclude minor grounding-line fluctuations, our data are explained most easily by early Holocene deglaciation followed by relatively stable ice positions until recent times and imply that Thwaites and Pine Island glaciers have not been substantially smaller than present during the past 5.5 kyr.
Citation
Braddock, S., Hall, B. L., Johnson, J. S., Balco, G., Spoth, M., Whitehouse, P. L., …Woodward, J. (2022). Relative sea-level data preclude major late Holocene ice-mass change in Pine Island Bay. Nature Geoscience, 15(7), 568-572. https://doi.org/10.1038/s41561-022-00961-y
Journal Article Type | Article |
---|---|
Acceptance Date | May 4, 2022 |
Online Publication Date | Jun 9, 2022 |
Publication Date | 2022-07 |
Deposit Date | Jun 10, 2022 |
Publicly Available Date | Jun 10, 2022 |
Journal | Nature Geoscience |
Print ISSN | 1752-0894 |
Electronic ISSN | 1752-0908 |
Publisher | Nature Research |
Peer Reviewed | Peer Reviewed |
Volume | 15 |
Issue | 7 |
Pages | 568-572 |
DOI | https://doi.org/10.1038/s41561-022-00961-y |
Public URL | https://durham-repository.worktribe.com/output/1201672 |
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