Journal
ANNALS OF GLACIOLOGY
Volume 54, Issue 64, Pages 90-96Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.3189/2013AoG64A202
Keywords
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Funding
- US National Science Foundation [86297]
- UK Natural Environment Research Council (NERC) Geophysical Equipment Facility
- Natural Environment Research Council [bas0100027] Funding Source: researchfish
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On RADARSAT imagery, the southern margin of the onset zone of Bindschadler Ice Stream, West Antarctica, manifests a multi-banded feature, with brightness varying across the bands and oscillating along each band. Ground-based radar profiles across the margin reveal folds in the firn stratigraphy associated with this pattern and provide evidence for correlation between the depth of shallow isochrones and the RADARSAT backscatter intensity on each profile, allowing us to interpret the banded feature for firn-layer geometry in three dimensions. We use a kinematic model of isochrone depth evolution to show how layer folding and the band expression may result from deformation and advection in the near-surface flow field at ice-stream margins, even with steady flow. The model predicts the formation of longitudinally patterned bands when the ice-stream acceleration fluctuates along flow. Concerted study of the planform and stratigraphy of other RADARSAT-detected features on the ice sheets may help us understand their origin.
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