Ice flow direction change in interior West Antarctica |
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Authors: | Siegert Martin J Welch Brian Morse David Vieli Andreas Blankenship Donald D Joughin Ian King Edward C Vieli Gwendolyn J-M C Leysinger Payne Antony J Jacobel Robert |
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Affiliation: | Centre for Polar Observation and Modelling, Bristol Glaciology Centre, School of Geographical Sciences, University of Bristol, Bristol BS8 1SS, UK. m.j.siegert@bristol.ac.uk |
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Abstract: | Upstream of Byrd Station (West Antarctica), ice-penetrating radar data reveal a distinctive fold structure within the ice, in which isochronous layers are unusually deep. The fold has an axis more than 50 kilometers long, which is aligned up to 45 degrees to the ice flow direction. Although explanations for the fold's formation under the present flow are problematic, it can be explained if flow was parallel to the fold axis approximately 1500 years ago. This flow change may be associated with ice stream alterations nearer the margin. If this is true, central West Antarctica may respond to future alterations more than previously thought. |
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