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Ice-shelf basal morphology from an upward-looking multibeam system deployed from an autonomous underwater vehicle

P. Dutrieux, A. Jenkins and K. W. Nicholls
Geological Society, London, Memoirs, 46, 219-220, 30 November 2016, https://doi.org/10.1144/M46.79
P. Dutrieux
1Polar Science Center, Applied Physics Laboratory, University of Washington, 1013 NE 40th Street, Box 355640, Seattle, Washington 98105, USA
2British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge CB3 0ET, UK
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A. Jenkins
2British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge CB3 0ET, UK
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K. W. Nicholls
2British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge CB3 0ET, UK
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The huge cavities beneath floating Antarctic ice shelves have only been explored recently by autonomous underwater vehicles (AUVs). Oceanic waters above the in situ freezing point melt those faces of marine-terminating glaciers and ice shelves with which they come into contact. This, in turn, impacts the dynamics of ice sheets as the reduction in buttressing allows the ice to flow faster into the ocean, increasing their contribution to eustatic sea-level rise (Shepherd et al. 2012). Pine Island Glacier (PIG) in West Antarctica (Fig. 1a, d) is an example, and has been accelerating and thinning over past decades, and still appears to be in retreat. This is driven by unpinning from a seabed ridge and exposure to high ocean temperatures of up to 1°C at the grounding line (Jenkins et al. 2010) that are subject to climatically forced variability (Dutrieux et al. 2014a).

Fig. 1.

(a) Surface elevation of Pine Island Glacier ice shelf (colour) (Dutrieux et al. 2013) overlays a Moderate Resolution Imaging Spectroradiometer image obtained on 28 December 2008. Thick black line shows the boundary between floating and grounded ice …

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Geological Society, London, Memoirs: 46 (1)
Geological Society, London, Memoirs
Volume 46
2016
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Ice-shelf basal morphology from an upward-looking multibeam system deployed from an autonomous underwater vehicle

P. Dutrieux, A. Jenkins and K. W. Nicholls
Geological Society, London, Memoirs, 46, 219-220, 30 November 2016, https://doi.org/10.1144/M46.79
P. Dutrieux
1Polar Science Center, Applied Physics Laboratory, University of Washington, 1013 NE 40th Street, Box 355640, Seattle, Washington 98105, USA
2British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge CB3 0ET, UK
  • Find this author on Google Scholar
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  • For correspondence: dutrieux@uw.edu
A. Jenkins
2British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge CB3 0ET, UK
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K. W. Nicholls
2British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge CB3 0ET, UK
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Ice-shelf basal morphology from an upward-looking multibeam system deployed from an autonomous underwater vehicle

P. Dutrieux, A. Jenkins and K. W. Nicholls
Geological Society, London, Memoirs, 46, 219-220, 30 November 2016, https://doi.org/10.1144/M46.79
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