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Antarctic palaeo-ice streams.

Livingstone, S.J. and O'Cofaigh, C.O. and Stokes , C.R. and Hillenbrand, C-D. and Vieli, A. and Jamieson, S.S.R. (2012) 'Antarctic palaeo-ice streams.', Earth-science reviews., 111 (1-2). pp. 90-128.

Abstract

We review the geomorphological, sedimentological and chronological evidence for palaeo-ice streams on the continental shelf of Antarctica and use this information to investigate basal conditions and processes, and to identify factors controlling grounding-line retreat. A comprehensive circum-Antarctic inventory of known palaeo-ice streams, their basal characteristics and minimum ages for their retreat following the Last Glacial Maximum (LGM) is also provided. Antarctic palaeo-ice streams are identified by a set of diagnostic landforms that, nonetheless, display considerable spatial variability due to the influence of substrate, flow velocity and subglacial processes. During the LGM, palaeo-ice streams extended, via bathymetric troughs, to the shelf edge of the Antarctic Peninsula and West Antarctica, and typically, to the mid-outer shelf of East Antarctica. The retreat history of the Antarctic Ice Sheet since the LGM is characterised by considerable asynchroneity, with individual ice streams exhibiting different retreat histories. This variability allows Antarctic palaeo-ice streams to be classified into discrete retreat styles and the controls on grounding-line retreat to be investigated. Such analysis highlights the important impact of internal factors on ice stream dynamics, such as bed characteristics and slope, and drainage basin size. Whilst grounding-line retreat may be triggered, and to some extent paced, by external (atmospheric and oceanic) forcing, the individual characteristics of each ice stream will modulate the precise timing and rate of retreat through time.

Item Type:Article
Keywords:Antarctica, Ice stream, Grounding-line retreat, Glacial geomorphology, Deglacial history.
Full text:(AM) Accepted Manuscript
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Status:Peer-reviewed
Publisher Web site:http://dx.doi.org/10.1016/j.earscirev.2011.10.003
Publisher statement:NOTICE: this is the author’s version of a work that was accepted for publication in Earth-science reviews. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Earth-science reviews, 111, 1-2, ISSUE#, 2012, 10.1016/j.earscirev.2011.10.003
Date accepted:No date available
Date deposited:25 July 2013
Date of first online publication:February 2012
Date first made open access:No date available

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