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Subglacial roughness of the Greenland Ice Sheet: relationship with contemporary ice velocity and geology

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Figure

Figure 1. Coverage of radar sounding surveys over the GrIS used inthis study. Topography-derived (topographic) roughness (R) is cal-culated using all available CReSIS survey data between 1993 and2016, where scattering-derived roughness (ξ) uses only a subs
Figure 2. Along-track example of calculated topographic roughness(R). This demonstrates the length scale (200 m) over which R is cal-culated from sampled bed elevation
Figure 3. Observed surface ice velocity characteristics of the GrIS used in the filtering of R
Figure 4. Estimation of scattering-derived roughness and data com-index (the 2011 P3 field season, which has maximumbination for bed-echo peakiness
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