The periodic topography of ice stream beds: Insights from the Fourier spectra of mega-scale glacial lineations

M Spagnolo, TC Bartholomaus, CD Clark, CR Stokes, N Atkinson, Julian Dowdeswell, JC Ely, AGC Graham, KA Hogan, EC King, RD Larter, SJ Livingstone & HD Pritchard
Ice stream bed topography contains key evidence for the ways ice streams interact with, and are potentially controlled by, their beds. Here we present the first application of two-dimensional Fourier analysis to 22 marine and terrestrial topographies from 5 regions in Antarctica and Canada, with and without mega-scale glacial lineations (MSGLs). We find that the topography of MSGL-rich ice stream sedimentary beds is characterized by multiple, periodic wavelengths between 300 and 1200 m and amplitudes...
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