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TitleComment on "The application of CCR and GPR to characterize ice conditions at Parsons Lake, Northwest Territories" by Angelopoulos et al.
AuthorOldenborger, G A
SourceCold Regions Science and Technology vol. 100, 2014 p. 68-70,
Alt SeriesEarth Sciences Sector, Contribution Series 20120422
Mediapaper; on-line; digital
File formatpdf
ProvinceNorthwest Territories
AreaParsons Lake
Lat/Long WENS-134.0000 -133.0000 69.0000 68.7500
Subjectssurficial geology/geomorphology; geophysics; permafrost; freezing ground; ground ice; ground temperatures; resistivity surveys; resistivity
ProgramLand-based Infrastructure, Climate Change Geoscience
AbstractAs 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.
Summary(Plain Language Summary, not published)
This work comments on a recent publication regarding the application of geophysics to permafrost detection and characterization near Parsons Lake in the Northwest Territories. As part of that publication, the authors suggest a methodology for dealing with some of the ambiguity present in the processing of geophysical data to generate images of the subsurface. However, the suggested methodology has significant flaws. This work describes those flaws and illustrates with examples how it can lead to over-interpretation of the geophysical data and a misleading picture of the subsurface.