Inland Thinning of Pine Island Glacier, West Antarctica

Author:

Shepherd Andrew1,Wingham Duncan J.1,Mansley Justin A. D.1,Corr Hugh F. J.2

Affiliation:

1. Centre for Polar Observation & Modelling, Department of Space and Climate Physics, University College London, 17 Gordon Street, London, WC1H 0AH, UK.

2. British Antarctic Survey, High Cross, Madingley Road, Cambridge CB3 0ET, UK.

Abstract

The Pine Island Glacier (PIG) transports 69 cubic kilometers of ice each year from ∼10% of the West Antarctic Ice Sheet (WAIS). It is possible that a retreat of the PIG may accelerate ice discharge from the WAIS interior. Satellite altimetry and interferometry show that the grounded PIG thinned by up to 1.6 meters per year between 1992 and 1999, affecting 150 kilometers of the inland glacier. The thinning cannot be explained by short-term variability in accumulation and must result from glacier dynamics.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Reference35 articles.

1. R. Warrick C. Le Provost M. Meier J. Oerlemans P. Woodworth in Climate Change 1995: The Science of Climate Change (Cambridge Univ. Press Cambridge 1966) pp. 359–405.

2. C. R. Bentley M. B. Giovinetto in Proceedings of the International Conference on the Role of Polar Regions in Global Change (Univ. of Alaska Fairbanks AK 1991) pp. 481–488. The authors obtained 26 Gt year −1 for the ice discharge flux of PIG. We used the improved estimate of 75 Gt year −1 determined by Rignot et al. (24).

3. Stability of the Junction of an Ice Sheet and an Ice Shelf

4. Thomas R. H., J. Glaciol. 24, 167 (1979).

5. Barcillon V., Macayeal D. R., J. Glaciol. 39, 131 (1993).

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