| Title | Comment on "The application of CCR and GPR to characterize ice conditions at Parsons Lake, Northwest Territories" by Angelopoulos et al. |
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| Author | Oldenborger, G A |
| Source | Cold Regions Science and Technology vol. 100, 2014 p. 68-70, https://doi.org/10.1016/j.coldregions.2013.10.003 |
| Image |  |
| Year | 2014 |
| Alt Series | Earth Sciences Sector, Contribution Series 20120422 |
| Publisher | Elsevier BV |
| Document | serial |
| Lang. | English |
| Media | paper; on-line; digital |
| File format | pdf |
| Province | Northwest Territories |
| NTS | 107B/15 |
| Area | Parsons Lake |
| Lat/Long WENS | -134.0000 -133.0000 69.0000 68.7500 |
| Subjects | surficial geology/geomorphology; geophysics; Nature and Environment; permafrost; freezing ground; ground ice; ground temperatures; resistivity surveys; resistivity |
| Illustrations | models |
| Program | Climate Change Geoscience |
| Released | 2014 04 01 |
| Abstract | 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. |
| 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. |
| GEOSCAN ID | 292271 |
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