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Impacts of marine instability across the East Antarctic Ice Sheet on Southern Ocean dynamics


Phipps, SJ and Fogwill, CJ and Turney, CSM, Impacts of marine instability across the East Antarctic Ice Sheet on Southern Ocean dynamics, Cryosphere, 10 pp. 2317-2328. ISSN 1994-0416 (2016) [Refereed Article]


Copyright Statement

Author(s) 2016. Licensed under Creative Commons Attribution 3.0 Unported (CC BY 3.0)

DOI: doi:10.5194/tc-10-2317-2016


Recent observations and modelling studies have demonstrated the potential for rapid and substantial retreat of large sectors of the East Antarctic Ice Sheet (EAIS). This has major implications for ocean circulation and global sea level. Here we examine the effects of increasing meltwater from the Wilkes Basin, one of the major marine-based sectors of the EAIS, on Southern Ocean dynamics. Climate model simulations reveal that the meltwater flux rapidly stratifies surface waters, leading to a dramatic decrease in the rate of Antarctic Bottom Water (AABW) formation. The surface ocean cools but, critically, the Southern Ocean warms by more than 1 C at depth. This warming is accompanied by a Southern Ocean-wide "domino effect", whereby the warming signal propagates westward with depth. Our results suggest that melting of one sector of the EAIS could result in accelerated warming across other sectors, including the Weddell Sea sector of the West Antarctic Ice Sheet. Thus, localised melting of the EAIS could potentially destabilise the wider Antarctic Ice Sheet.

Item Details

Item Type:Refereed Article
Keywords:Antarctica, Southern Ocean, ice sheets, ocean circulation, sea level, climate models
Research Division:Earth Sciences
Research Group:Physical geography and environmental geoscience
Research Field:Glaciology
Objective Division:Environmental Policy, Climate Change and Natural Hazards
Objective Group:Understanding climate change
Objective Field:Effects of climate change on Antarctic and sub-Antarctic environments (excl. social impacts)
UTAS Author:Phipps, SJ (Dr Steven Phipps)
ID Code:112071
Year Published:2016
Web of Science® Times Cited:11
Deposited By:Oceans and Cryosphere
Deposited On:2016-10-25
Last Modified:2018-03-26
Downloads:144 View Download Statistics

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