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

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, impact...

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Bibliographic Details
Published in:Geological Society, London, Memoirs
Main Authors: Dutrieux, Pierre, Jenkins, Adrian, Nicholls, Keith W.
Other Authors: Dowdeswell, J.A., Canals, M., Jakobsson, M., Todd, B.J., Dowdeswell, E.K., Hogan, K.A.
Format: Book Part
Language:unknown
Published: Geological Society of London 2016
Subjects:
Marine Sciences
Antarctic
West Antarctica
Pine Island Glacier
Antarc*
Antarctica
Ice Shelf
Ice Shelves
Pine Island
Online Access:http://nora.nerc.ac.uk/id/eprint/515705/
https://doi.org/10.1144/M46.79
Description
Summary: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).

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