The Impact of Basal Roughness on Inland Thwaites Glacier Sliding
- Hoffman, Andrew O.
- Christianson, Knut
- Holschuh, Nicholas
- Case, Elizabeth
- Kingslake, Jonathan
- Arthern, Robert
DOIAbstract
Swath radar technology enables three-dimensional mapping of modern glacier beds over large areas at resolutions that are higher than those typically used in ice-flow models. These data may enable new understanding of processes at the ice-bed interface. Here, we use two densely surveyed swath-mapped topographies (<50 m2 resolution) of Thwaites Glacier to investigate the sensitivity of inferred basal friction proxies to bed roughness magnitude and orientation. Our work suggests that along-flow roughness influences inferred friction more than transverse-flow roughness, which agrees with analytic form-drag sliding theory. Using our model results, we calculate the slip length (the ratio of internal shear to basal slip). We find excellent agreeme...
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