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- Title
What lies beneath: A detailed bathymetry of the sea-floor below Ekström Ice Shelf, East Antarctica.
- Authors
Smith, Emma C.; Drews, Reinhard; Ehlers, Todd; Franke, Dieter; Gaedike, Christoph; Hofstede, Coen; Kuhn, Gerhard; Lambrecht, Astrid; Mayer, Christoph; Tiedemann, Ralf; Eisen, Olaf
- Abstract
An extensive grid of seismic reflection data collected on Ekström Ice Shelf, East Antarctica, between 2010–2018, using an on-ice vibroseis source and snowstreamer, are used to make a detailed bathymetry map of the sea floor and ice-shelf cavity. The maps shows a deep sea-floor trough, likely a paleao-ice stream, under the western side of the ice shelf. The trough contains a number of points of higher topography, indicating probable former grounding line positions. At the shelf front a sill running across the width of the shelf has implications for ocean circulation and thus ice-ocean interaction and ice shelf melt. This new bathymetry is markedly different from previous models, which show a generally flat and shallow sea floor in the region. This is presumably the case for many of the smaller ice-shelves in Dronning Maud Land, which highlights the need for better bathymetry measurements in these key threshold regions.
- Subjects
ANTARCTICA; ICE shelves; BATHYMETRY; DETECTION limit; OCEAN bottom; OCEAN circulation; TOPOGRAPHY
- Publication
Geophysical Research Abstracts, 2019, Vol 21, p1
- ISSN
1029-7006
- Publication type
Article