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A prerequisite for modeling the ice sheet and oceanographic processes within the cavity is an accurate knowledge of the sub\u2010ice 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 data sets 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\u2010ice 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\u2010ice shelf melt rates.<\/jats:p>","DOI":"10.1029\/2018jc013982","type":"journal-article","created":{"date-parts":[[2018,6,8]],"date-time":"2018-06-08T14:16:45Z","timestamp":1528467405000},"page":"4610-4623","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":25,"title":["A New Bathymetry for the Southeastern Filchner\u2010Ronne Ice Shelf: Implications for Modern Oceanographic Processes and Glacial History"],"prefix":"10.1029","volume":"123","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3047-9908","authenticated-orcid":false,"given":"S. H. 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