Offshore-onshore record of Last Glacial Maximum−to−present grounding line retreat at Pine Island Glacier, Antarctica

Nichols, Keir A.; Rood, Dylan H.; Venturelli, Ryan A.; Balco, Greg; Adams, Jonathan; Guillaume, Louise; Campbell, Seth; Goehring, Brent M.; Hall, Brenda L.; Wilcken, Klaus; Woodward, John; Johnson, Joanne S. ORCID: https://orcid.org/0000-0003-4537-4447. 2023 Offshore-onshore record of Last Glacial Maximum−to−present grounding line retreat at Pine Island Glacier, Antarctica. Geology, 51 (11). 1033-1037. https://doi.org/10.1130/G51326.1

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Abstract/Summary

Pine Island Glacier, West Antarctica, is the largest Antarctic contributor to global sea-level rise and is vulnerable to rapid retreat, yet our knowledge of its deglacial history since the Last Glacial Maximum is based largely on marine sediments that record a retreat history ending in the early Holocene. Using a suite of 10Be exposure ages from onshore glacial deposits directly adjacent to Pine Island Glacier, we show that this major glacier thinned rapidly in the early to mid-Holocene. Our results indicate that Pine Island Glacier was at least 690 m thicker than present prior to ca. 8 ka. We infer that the rapid thinning detected at the site furthest downstream records the arrival and stabilization of the retreating grounding line at that site by 8−6 ka. By combining our exposure ages and the marine record, we extend knowledge of Pine Island Glacier retreat both spatially and temporally: to 50 km from the modern grounding line and to the mid-Holocene, providing a data set that is important for future numerical ice-sheet model validation.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	https://doi.org/10.1130/G51326.1
ISSN:	0091-7613
Date made live:	13 Sep 2023 09:49 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/534387

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