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Physical attributes of sea-ice kinematics during spring 2007 off East Antarctica


Heil, P and Massom, RA and Allison, I and Worby, AP, Physical attributes of sea-ice kinematics during spring 2007 off East Antarctica, Deep-Sea Research. Part 2: Topical Studies in Oceanography, 58, (9-10) pp. 1158-1171. ISSN 0967-0645 (2011) [Refereed Article]

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DOI: doi:10.1016/j.dsr2.2010.12.004


In austral spring 2007, two meso-scale (of the order of 10100 km) drifting buoy arrays were deployed to investigate the sea-ice kinematics off East Antarctica during the Sea Ice Physics and Ecosystem eXperiment (SIPEX). Deployment locations were within the one oceanic surface-drift regime with similarly high ice concentrations, the two arrays were about 440 km apart. Deployments of the two arrays were separated by 18 days. During spring 2007 the sea ice in the region was under the influence of enhanced atmospheric forcing, associated with an unprecedented seasonal increase in cyclone intensity. This atmospheric anomaly also led to repeated winter breakouts of the fast ice around much of East Antarctica (1121341E), which, in turn, enabled the southward advection of pack ice into zones of quasistationary ice. Consequently, synoptic-scale atmospheric activity strongly influenced the characteristics of the regional fast-ice zone. Despite the intensified atmospheric forcing, only 73% of the variability in seaicemotion is explained by direct atmospheric forcing, compared to 85% derived in previous studies for the same region and time of year. This reduction of synoptic-scale (multi-daily period) variability agrees with relatively high levels of semi-diurnal motion variance (compared to previous studies). Non-linear ice mechanics enable this energy cascade to higher frequencies. Both arrays experienced significant divergence, which enlarged their area by 230% (eastern array, 28 days) and 267% (western array, 30 days) without significant decrease of ice concentration within the enclosed area, indicating that active ice growth was still prevalent in the region. Divergence and shear deformation dominated the deformation parameters.

Item Details

Item Type:Refereed Article
Keywords:Antarctic Sea Ice Kinematics Dynamics Drifting Buoys
Research Division:Earth Sciences
Research Group:Physical geography and environmental geoscience
Research Field:Glaciology
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the earth sciences
UTAS Author:Heil, P (Dr Petra Heil)
UTAS Author:Massom, RA (Dr Robert Massom)
UTAS Author:Allison, I (Dr Ian Allison)
UTAS Author:Worby, AP (Professor Anthony Worby)
ID Code:76077
Year Published:2011
Web of Science® Times Cited:7
Deposited By:CRC-Antarctic Climate & Ecosystems
Deposited On:2012-02-27
Last Modified:2017-11-06
Downloads:1 View Download Statistics

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