Increased rate of acceleration on Pine Island Glacier strongly coupled to changes in gravitational driving stress

Scott, J. B. T., Gudmundsson, Hilmar, Smith, A. M., Bingham, Robert G., Pritchard, Hamish D. and Vaughan, David G. (2009) Increased rate of acceleration on Pine Island Glacier strongly coupled to changes in gravitational driving stress. The Cryosphere, 3 (1). pp. 125-131. ISSN 1994-0424

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Official URL: http://dx.doi.org/10.5194/tc-3-125-2009

Abstract

Pine Island Glacier, Antarctica, has been undergoing several related changes for at least two decades; these include acceleration, thinning and grounding line retreat. During the first major ground-based study between 2006 and 2008, GPS receivers were used to monitor ice flow from 55 km to 171 km inland, along the central flowline. At four sites both acceleration and thinning rates over the last two years exceeded rates observed at any other time over the last two decades. At the downstream site acceleration was 6.4% over 2007 and thinning was 3.5 ± 0.5 ma-1. Acceleration and thinning have spread rapidly inland with the acceleration 171 km inland at 4.1% over 2007, greater than any measured annual flow increase along the whole glacier prior to 2006. Increases in surface slope, and hence gravitational driving stress, correlate well with the acceleration and no sustained change in longitudinal stress gradient is needed to explain the force balance. There is no indication that the glacier is approaching a new steady state.

Item Type: Article
Subjects: F800 Physical and Terrestrial Geographical and Environmental Sciences
Department: Faculties > Engineering and Environment > Geography and Environmental Sciences
Depositing User: Paul Burns
Date Deposited: 15 Jan 2019 09:59
Last Modified: 11 Oct 2019 07:06
URI: http://nrl.northumbria.ac.uk/id/eprint/37586

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