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

Sebastian Rosier, Coen Hofstede, Alex M. Brisbourne, Tore Hattermann, Keith Nicholls, Peter Davis, Paul Anker, Claus-Dieter Hillenbrand, Andrew Smith, Hugh Corr

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)
22 Downloads (Pure)

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.
Original languageEnglish
Pages (from-to)4610-4623
JournalJournal of Geophysical Research: Oceans
Volume123
Issue number7
Early online date5 Jul 2018
DOIs
Publication statusPublished - Jul 2018

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