Boundary condition of grounding lines prior to collapse, Larsen-B Ice Shelf, Antarctica

Rebesco, M.; Domack, E.; Zgur, F.; Lavoie, C.; Leventer, A.; Brachfeld, S.; Willmott, V.; Halverson, G.; Truffer, M.; Scambos, T.; Smith, J. ORCID: https://orcid.org/0000-0002-1333-2544; Pettit, E.. 2014 Boundary condition of grounding lines prior to collapse, Larsen-B Ice Shelf, Antarctica. Science, 345 (6202). 1354-1358. https://doi.org/10.1126/science.1256697

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Text An edited version of this paper was published in Science. Revised Crane Paper July 9.doc - Accepted Version Download (3MB)

Abstract/Summary

Grounding zones, where ice sheets transition between resting on bedrock to full floatation, help regulate ice flow. Exposure of the sea floor by the 2002 Larsen-B Ice Shelf collapse allowed detailed morphologic mapping and sampling of the embayment sea floor. Marine geophysical data collected in 2006 reveal a large, arcuate, complex grounding zone sediment system at the front of Crane Fjord. Radiocarbon-constrained chronologies from marine sediment cores indicate loss of ice contact with the bed at this site about 12,000 years ago. Previous studies and morphologic mapping of the fjord suggest that the Crane Glacier grounding zone was well within the fjord before 2002 and did not retreat further until after the ice shelf collapse. This implies that the 2002 Larsen-B Ice Shelf collapse likely was a response to surface warming rather than to grounding zone instability, strengthening the idea that surface processes controlled the disintegration of the Larsen Ice Shelf.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	https://doi.org/10.1126/science.1256697
Programmes:	BAS Programmes > Polar Science for Planet Earth (2009 - ) > Ice Sheets
ISSN:	0036-8075
Date made live:	22 Sep 2014 14:06 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/508469

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