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Widespread collapse of the Ross Ice Shelf during the late Holocene

Citation

Yokoyama, Y and Anderson, JB and Yamane, M and Simkins, LM and Miyairi, Y and Yamazaki, T and Koizumi, M and Suga, H and Kusahara, K and Prothro, L and Hasumi, H and Southon, JR and Ohkouchi, N, Widespread collapse of the Ross Ice Shelf during the late Holocene, National Academy of Sciences of The United States of America. Proceedings, 113, (9) pp. 2354-2359. ISSN 0027-8424 (2016) [Refereed Article]

Copyright Statement

Copyright 2016 The Authors

DOI: doi:10.1073/pnas.1516908113

Abstract

The stability of modern ice shelves is threatened by atmospheric and oceanic warming. The geologic record of formerly glaciated continental shelves provides a window into the past of how ice shelves responded to a warming climate. Fields of deep (−560 m), linear iceberg furrows on the outer, western Ross Sea continental shelf record an early post-Last Glacial Maximum episode of ice-shelf collapse that was followed by continuous retreat of the grounding line for ∼200 km. Runaway grounding line conditions culminated once the ice became pinned on shallow banks in the western Ross Sea. This early episode of ice-shelf collapse is not observed in the eastern Ross Sea, where more episodic grounding line retreat took place. More widespread (∼280,000 km2) retreat of the ancestral Ross Ice Shelf occurred during the late Holocene. This event is recorded in sediment cores by a shift from terrigenous glacimarine mud to diatomaceous open-marine sediment as well as an increase in radiogenic beryllium (10Be) concentrations. The timing of ice-shelf breakup is constrained by compound specific radiocarbon ages, the first application of this technique systematically applied to Antarctic marine sediments. Breakup initiated around 5 ka, with the ice shelf reaching its current configuration ∼1.5 ka. In the eastern Ross Sea, the ice shelf retreated up to 100 km in about a thousand years. Three-dimensional thermodynamic ice-shelf/ocean modeling results and comparison with ice-core records indicate that ice-shelf breakup resulted from combined atmospheric warming and warm ocean currents impinging onto the continental shelf.

Item Details

Item Type:Refereed Article
Keywords:Ross Ice Shelf
Research Division:Earth Sciences
Research Group:Atmospheric Sciences
Research Field:Climate Change Processes
Objective Division:Environment
Objective Group:Climate and Climate Change
Objective Field:Effects of Climate Change and Variability on Antarctic and Sub-Antarctic Environments (excl. Social Impacts)
Author:Kusahara, K (Dr Kazuya Kusahara)
ID Code:109886
Year Published:2016
Web of Science® Times Cited:4
Deposited By:CRC-Antarctic Climate & Ecosystems
Deposited On:2016-07-06
Last Modified:2017-03-08
Downloads:0

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