Spectral Induced Polarization imaging to investigate an ice-rich mountain permafrost site in Switzerland
Spectral induced polarization (SIP) measurements were collected at the Lapires talus slope, a long-term permafrost monitoring site located in the Western Swiss Alps, to assess the potential of the frequency dependence (within the frequency range of 0.1–225 Hz) of the electrical polarization response...
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ftcopernicus:oai:publications.copernicus.org:tcd96611 2023-05-15T16:36:40+02:00 Spectral Induced Polarization imaging to investigate an ice-rich mountain permafrost site in Switzerland Maierhofer, Theresa Hauck, Christian Hilbich, Christin Kemna, Andreas Flores-Orozco, Adrián 2021-09-21 application/pdf https://doi.org/10.5194/tc-2021-234 https://tc.copernicus.org/preprints/tc-2021-234/ eng eng doi:10.5194/tc-2021-234 https://tc.copernicus.org/preprints/tc-2021-234/ eISSN: 1994-0424 Text 2021 ftcopernicus https://doi.org/10.5194/tc-2021-234 2021-09-27T16:22:26Z Spectral induced polarization (SIP) measurements were collected at the Lapires talus slope, a long-term permafrost monitoring site located in the Western Swiss Alps, to assess the potential of the frequency dependence (within the frequency range of 0.1–225 Hz) of the electrical polarization response of frozen rocks for an improved permafrost characterization. The aim of our investigation was to (a) find a field protocol that provides SIP imaging data sets less affected by electromagnetic coupling and easy to deploy in rough terrains, (b) cover the spatial extent of the local permafrost distribution, and (c) evaluate the potential of the spectral data to discriminate between different substrates and spatial variations in the volumetric ice content within the talus slope. To qualitatively assess data uncertainty, we analyze the misfit between normal and reciprocal (N&R) measurements collected for all profiles and frequencies. A comparison between different cable setups reveals the lowest N&R misfits for coaxial cables and the possibility to collect high-quality SIP data in the range between 0.1–75 Hz. We observe an overall smaller spatial extent of the ice-rich permafrost body compared to its assumed distribution from previous studies. Our results further suggest that SIP data help to improve the discrimination between ice-rich permafrost and unfrozen bedrock in ambiguous cases based on their characteristic spectral behavior, with ice-rich areas showing a stronger polarization towards higher frequencies in agreement with the well-known spectral response of ice. Text Ice permafrost Copernicus Publications: E-Journals |
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Open Polar |
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Copernicus Publications: E-Journals |
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English |
description |
Spectral induced polarization (SIP) measurements were collected at the Lapires talus slope, a long-term permafrost monitoring site located in the Western Swiss Alps, to assess the potential of the frequency dependence (within the frequency range of 0.1–225 Hz) of the electrical polarization response of frozen rocks for an improved permafrost characterization. The aim of our investigation was to (a) find a field protocol that provides SIP imaging data sets less affected by electromagnetic coupling and easy to deploy in rough terrains, (b) cover the spatial extent of the local permafrost distribution, and (c) evaluate the potential of the spectral data to discriminate between different substrates and spatial variations in the volumetric ice content within the talus slope. To qualitatively assess data uncertainty, we analyze the misfit between normal and reciprocal (N&R) measurements collected for all profiles and frequencies. A comparison between different cable setups reveals the lowest N&R misfits for coaxial cables and the possibility to collect high-quality SIP data in the range between 0.1–75 Hz. We observe an overall smaller spatial extent of the ice-rich permafrost body compared to its assumed distribution from previous studies. Our results further suggest that SIP data help to improve the discrimination between ice-rich permafrost and unfrozen bedrock in ambiguous cases based on their characteristic spectral behavior, with ice-rich areas showing a stronger polarization towards higher frequencies in agreement with the well-known spectral response of ice. |
format |
Text |
author |
Maierhofer, Theresa Hauck, Christian Hilbich, Christin Kemna, Andreas Flores-Orozco, Adrián |
spellingShingle |
Maierhofer, Theresa Hauck, Christian Hilbich, Christin Kemna, Andreas Flores-Orozco, Adrián Spectral Induced Polarization imaging to investigate an ice-rich mountain permafrost site in Switzerland |
author_facet |
Maierhofer, Theresa Hauck, Christian Hilbich, Christin Kemna, Andreas Flores-Orozco, Adrián |
author_sort |
Maierhofer, Theresa |
title |
Spectral Induced Polarization imaging to investigate an ice-rich mountain permafrost site in Switzerland |
title_short |
Spectral Induced Polarization imaging to investigate an ice-rich mountain permafrost site in Switzerland |
title_full |
Spectral Induced Polarization imaging to investigate an ice-rich mountain permafrost site in Switzerland |
title_fullStr |
Spectral Induced Polarization imaging to investigate an ice-rich mountain permafrost site in Switzerland |
title_full_unstemmed |
Spectral Induced Polarization imaging to investigate an ice-rich mountain permafrost site in Switzerland |
title_sort |
spectral induced polarization imaging to investigate an ice-rich mountain permafrost site in switzerland |
publishDate |
2021 |
url |
https://doi.org/10.5194/tc-2021-234 https://tc.copernicus.org/preprints/tc-2021-234/ |
genre |
Ice permafrost |
genre_facet |
Ice permafrost |
op_source |
eISSN: 1994-0424 |
op_relation |
doi:10.5194/tc-2021-234 https://tc.copernicus.org/preprints/tc-2021-234/ |
op_doi |
https://doi.org/10.5194/tc-2021-234 |
_version_ |
1766026996923498496 |