Self-affine subglacial roughness: consequences for radar scattering and basal water discrimination in northern Greenland
Thomas M. Jordan et al.
Likely Basal Thermal State of the Greenland Ice Sheet, Version 1J. A. MacGregor, M. Fahnestock, G. Catania, J. Paden, P. Gogineni, M. Morlighem, W. Colgan, S. M. Nowicki, G. Clow, A. Aschwanden, S. F. Price, and H. Seroussi http://dx.doi.org/10.5067/R4MWDWWUWQF9
Using radio-echo sounding data from northern Greenland, we demonstrate that subglacial roughness exhibits self-affine (fractal) scaling behaviour. This enables us to assess topographic control upon the bed-echo waveform, and explain the spatial distribution of the degree of scattering (specular and diffuse reflections). Via comparison with a prediction for the basal thermal state (thawed and frozen regions of the bed) we discuss the consequences of our study for basal water discrimination.
Using radio-echo sounding data from northern Greenland, we demonstrate that subglacial roughness...