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Earth Surface Dynamics An interactive open-access journal of the European Geosciences Union

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Earth Surf. Dynam., 3, 239-249, 2015
http://www.earth-surf-dynam.net/3/239/2015/
doi:10.5194/esurf-3-239-2015
© Author(s) 2015. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
09 Apr 2015
Origin and dynamic significance of longitudinal structures ("flow stripes") in the Antarctic Ice Sheet
N. F. Glasser, S. J. A. Jennings, M. J. Hambrey, and B. Hubbard Department of Geography and Earth Sciences, Aberystwyth University, SY23 3DB, Wales, UK
Abstract. Longitudinal ice-surface structures in the Antarctic Ice Sheet can be traced continuously down-ice for distances of up to 1200 km. A map of the distribution of ~ 3600 of these features, compiled from satellite images, shows that they mirror the location of fast-flowing glaciers and ice streams that are dominated by basal sliding rates above tens of metres per annum and are strongly guided by subglacial topography. Longitudinal ice-surface structures dominate regions of converging flow, where ice flow is subject to non-coaxial strain and simple shear. They can be traced continuously through crevasse fields and through blue-ice areas, indicating that they represent the surface manifestation of a three-dimensional structure, interpreted as foliation. Flow lines are linear and undeformed for all major flow units described here in the Antarctic Ice Sheet except for the Kamb Ice Stream and the Institute and Möller Ice Stream areas, where areas of flow perturbation are evident. Parcels of ice along individual flow paths on the Lambert Glacier, Recovery Glacier, Byrd Glacier and Pine Island Glacier may reside in the glacier system for ~ 2500 to 18 500 years. Although it is unclear how long it takes for these features to form and decay, we infer that the major ice-flow configuration of the ice sheet may have remained largely unchanged for the last few hundred years, and possibly even longer. This conclusion has implications for our understanding of the long-term landscape evolution of Antarctica, including large-scale patterns of glacial erosion and deposition.

Citation: Glasser, N. F., Jennings, S. J. A., Hambrey, M. J., and Hubbard, B.: Origin and dynamic significance of longitudinal structures ("flow stripes") in the Antarctic Ice Sheet, Earth Surf. Dynam., 3, 239-249, doi:10.5194/esurf-3-239-2015, 2015.
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Short summary
We present a new map of the surface features of the entire Antarctic Ice Sheet. The map was compiled from satellite images. It shows many flow-parallel structures that we call "longitudinal ice-surface structures". Their location mirrors the location of fast-flowing glaciers and ice streams in the ice sheet. Their distribution indicates that the major ice-flow configuration of the ice sheet may have remained largely unchanged for the last few hundred years, and possibly even longer.
We present a new map of the surface features of the entire Antarctic Ice Sheet. The map was...
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