publication . Other literature type . Article . 2007

Keel depths of modern Antarctic icebergs and implications for sea-floor scouring in the geological record

Jonathan Bamber; Julian Dowdeswell;
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  • Published: 01 Sep 2007
  • Publisher: Elsevier BV
Abstract
Abstract Icebergs affect the geological record through the scouring or ploughing action of their keels, reworking sediments where they contact the sea floor. Satellite radar-altimeter measurements of the surface elevation of the marine margins of the Antarctic Ice Sheet are inverted to produce ice-thickness values. These data are assumed to represent the keel depths of newly-calved icebergs. There are three peaks in the frequency distribution of Antarctic iceberg–keel depths: (a) about 140–200 m in thickness, associated with smaller ice shelves fringing Antarctica (e.g. Wilkins, George VI and Brunt ice shelves); (b) about 250–300 m, from large ice shelves (e.g. ...
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