A new bathymetry for the southeastern Filchner-Ronne Ice Shelf: implications for modern oceanographic processes and glacial history

Rosier, Sebastian, Hofstede, Coen, Brisbourne, Alex M., Hatterman, Tore, Nicholls, Keith, Davis, Peter, Anker, Paul, Hillenbrand, Claus-Dieter, Smith, Andrew and Corr, Hugh (2018) A new bathymetry for the southeastern Filchner-Ronne Ice Shelf: implications for modern oceanographic processes and glacial history. Journal of Geophysical Research: Oceans, 123 (7). pp. 14610-4623. ISSN 2169-9291

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Official URL: https://doi.org/10.1029/2018JC013982

Abstract

The Filchner-Ronne Ice Shelf, the ocean cavity beneath it and the Weddell Sea that bounds it, form an important part of the global climate system by modulating ice discharge from the Antarctic Ice Sheet and producing cold dense water masses that feed the global thermohaline circulation. A prerequisite for modeling the ice sheet and oceanographic processes within the cavity is an accurate knowledge of the sub-ice-sheet bedrock elevation, but beneath the ice shelf where airborne radar cannot penetrate, bathymetric data are sparse. This paper presents new seismic point measurements of cavity geometry from a particularly poorly sampled region south of Berkner Island that connects the Filchner and Ronne ice shelves. An updated bathymetric grid formed by combining the new data with existing datasets reveals several new features. In particular, a sill running between Berkner Island and the mainland could alter ocean circulation within the cavity and change our understanding of paleo-ice-stream flow in the region. Also revealed are deep troughs near the grounding lines of Foundation and Support Force ice streams, which provide access for seawater with melting potential. Running an ocean tidal model with the new bathymetry reveals large differences in tidal current velocities, both within the new gridded region and further afield, potentially affecting sub-ice-shelf melt rates.

Item Type: Article
Uncontrolled Keywords: bathymetry, seismics, Antarctica, ice shelf, tides
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 Jun 2018 13:44
Last Modified: 11 Oct 2019 06:35
URI: http://nrl.northumbria.ac.uk/id/eprint/34574

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