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Examining the interaction between multi-year landfast sea ice and the Mertz Glacier Tongue, East Antarctica: Another factor in ice sheet stability?

Citation

Massom, RA and Giles, AB and Fricker, HA and Warner, RC and Legresy, B and Hyland, G and Young, NW and Fraser, AD, Examining the interaction between multi-year landfast sea ice and the Mertz Glacier Tongue, East Antarctica: Another factor in ice sheet stability?, Journal of Geophysical Research-Oceans, 115, (12) pp. 1-15. ISSN 0148-0227 (2010) [Refereed Article]


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Copyright Statement

Copyright 2010 American Geophysical Union

Official URL: http://dx.doi.org/10.1111/j.1751-7176.2011.00480.x

DOI: doi:10.1029/2009JC006083

Abstract

The Mertz Glacier tongue (MGT), East Antarctica, has a large area of multi-year fast sea ice (MYFI) attached to its eastern edge. We use various satellite data sets to study the extent, age, and thickness of the MYFI and how it interacts with the MGT. We estimate its age to be at least 25 years and its thickness to be 10-55 m; this is an order of magnitude thicker than the average regional sea-ice thickness and too thick to be formed through sea-ice growth alone. We speculate that the most plausible process for its growth after initial formation is marine (frazil) ice accretion. The satellite data provide two types of evidence for strong mechanical coupling between the two types of ice: The MYFI moves with the MGT, and persistent rifts that originate in the MGT continue to propagate for large distances into the MYFI. The area of MYFI decreased by 50% following the departure of two large tabular icebergs that acted as pinning points and protective barriers. Future MYFI extent will be affected by subsequent icebergs from the Ninnis Glacier and the imminent calving of the MGT. Fast ice is vulnerable to changing atmospheric and oceanic conditions, and its disappearance may have an influence on ice tongue/ice shelf stability. Understanding the influence of thick MYFI on floating ice tongues/ice shelves may be significant to understanding the processes that control their evolution and how these respond to climate change, and thus to predicting the future of the Antarctic Ice Sheet.

Item Details

Item Type:Refereed Article
Keywords:Mertz Glacier tongue, MGT, East Antarctica, multi-year fast sea ice, MYFI, satellite data, iceberg, ice tongues, ice shelves, Antarctic Ice Sheet
Research Division:Earth Sciences
Research Group:Physical Geography and Environmental Geoscience
Research Field:Glaciology
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:Massom, RA (Dr Robert Massom)
Author:Giles, AB (Dr Barry Giles)
Author:Warner, RC (Dr Roland Warner)
Author:Hyland, G (Dr Glenn Hyland)
Author:Young, NW (Mr Neal Young)
Author:Fraser, AD (Dr Alex Fraser)
ID Code:71034
Year Published:2010
Web of Science® Times Cited:25
Deposited By:Research Division
Deposited On:2011-07-07
Last Modified:2012-10-09
Downloads:1 View Download Statistics

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