Comment on “The application of CCR and GPR to characterize ice conditions at Parsons Lake, Northwest Territories” by Angelopoulos et al.

As part of a permafrost characterization study using capacitively-coupled resistivity data, Angelopoulos et al. (2013) suggest a methodology for selecting the inversion damping factor based on the depth of investigation. I argue that the suggested methodology conflicts with the discrepancy principle which states that the damping factor should be chosen based on a target misfit. Furthermore, a misfit-based selection of the damping factor is required for the depth of investigation to provide a reasonable measure of model resolution in the context of noisy data.