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Ice shelf/ocean interactions under the Amery Ice Shelf: seasonal variability and its effect on marine ice formation


Herraiz-Borreguero, L and Allison, I and Craven, M and Nicholls, KW and Rosenberg, MA, Ice shelf/ocean interactions under the Amery Ice Shelf: seasonal variability and its effect on marine ice formation, Journal of Geophysical Research: Oceans, 118, (12) pp. 7117-7131. ISSN 2169-9275 (2013) [Refereed Article]


Copyright Statement

Copyright 2013 American Geophysical Union

DOI: doi:10.1002/2013JC009158


[1]áMarine ice is an important factor in ice shelf stability. An extensive marine ice layer is present under the Amery Ice Shelf (AIS), East Antarctica. This paper documents observations on the seasonal variability of the AIS-ocean interaction beneath the marine ice layer. We focus on data collected during 2002 through a borehole at AM01, 100 km from the ice shelf calving front, and use additional data from two other boreholes to complement the study. At AM01, the top ∼20 m of the water column is super-cooled almost year round, protecting the marine ice layer and promoting frazil ice formation. The mixed layer thickness varies from ∼50 m in February to at least 160 m by June, as the water column cools and freshens. High Salinity Shelf Water (HSSW) abruptly arrives at AM01 in JuneľAugust as an eddy-like flow. We suggest that the flow characteristics are a result of baroclinic instabilities. In addition, the inflow of HSSW results in a steepening of the isopycnals that enhances the upwelling of Ice Shelf Water. This study documents, for the first time, a seasonal signal in the formation of marine ice under the AIS. Our results highlight the vulnerability of the marine ice layer to ocean variability with potential consequences for the overall ice shelf mass balance.

Item Details

Item Type:Refereed Article
Keywords:Amery Ice Shelf, marine ice, frazil, High Salinity Shelf Water
Research Division:Earth Sciences
Research Group:Oceanography
Research Field:Physical oceanography
Objective Division:Environmental Management
Objective Group:Management of Antarctic and Southern Ocean environments
Objective Field:Antarctic and Southern Ocean oceanic processes
UTAS Author:Herraiz-Borreguero, L (Dr Laura Herraiz-Borreguero)
UTAS Author:Allison, I (Dr Ian Allison)
UTAS Author:Craven, M (Mr Mike Craven)
UTAS Author:Rosenberg, MA (Mr Mark Rosenberg)
ID Code:100630
Year Published:2013
Web of Science® Times Cited:28
Deposited By:CRC-Antarctic Climate & Ecosystems
Deposited On:2015-05-22
Last Modified:2017-10-30
Downloads:175 View Download Statistics

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