Articles | Volume 17, issue 7
https://doi.org/10.5194/tc-17-2919-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/tc-17-2919-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
19 Jul 2023
Research article |
| 19 Jul 2023
| 19 Jul 2023
Identifying mountain permafrost degradation by repeating historical electrical resistivity tomography (ERT) measurements
Johannes Buckel
CORRESPONDING AUTHOR
Institute for Geophysics and Extraterrestrial Physics, Technische
Universität Braunschweig, 38106 Braunschweig, Germany
Jan Mudler
Institute for Geophysics and Extraterrestrial Physics, Technische
Universität Braunschweig, 38106 Braunschweig, Germany
Rainer Gardeweg
Department of Geosciences, University of Fribourg, 1700 Fribourg,
Switzerland
Christian Hauck
Department of Geosciences, University of Fribourg, 1700 Fribourg,
Switzerland
Christin Hilbich
Department of Geosciences, University of Fribourg, 1700 Fribourg,
Switzerland
Regula Frauenfelder
Department of Geosciences, Norwegian Geotechnical Institute, Sandakerveien 140, 0484 Oslo, Norway
Christof Kneisel
Institute of Geography and Geology, University of Würzburg, Am Hubland, 97074 Würzburg, Germany
Sebastian Buchelt
Institute of Geography and Geology, University of Würzburg, Am Hubland, 97074 Würzburg, Germany
Jan Henrik Blöthe
Institute of Environmental Social Sciences and Geography, University of Freiburg, 79085 Freiburg, Germany
Andreas Hördt
Institute for Geophysics and Extraterrestrial Physics, Technische
Universität Braunschweig, 38106 Braunschweig, Germany
Matthias Bücker
Institute for Geophysics and Extraterrestrial Physics, Technische
Universität Braunschweig, 38106 Braunschweig, Germany
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Annette Sophie Bösmeier and Jan Henrik Blöthe
E&G Quaternary Sci. J., 74, 301–324, https://doi.org/10.5194/egqsj-74-301-2025, https://doi.org/10.5194/egqsj-74-301-2025, 2025
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We estimated the thickness, spatial distribution, and volumes of alluvial valley fills in the southwestern Black Forest utilizing an extensive borehole database to compile local valley cross sections and model sediment depth above bedrock. Our results reveal considerable spatial heterogeneity and underscore the importance of tectonic boundary conditions on the valley infill in addition to further geologic, hydrologic, and climatologic conditions and processes interacting with fluvial dynamics.
Melanie Stammler, Jan Blöthe, Diego Cusicanqui, Simon Ebert, Rainer Bell, Xavier Bodin, and Lothar Schrott
EGUsphere, https://doi.org/10.5194/egusphere-2025-4630, https://doi.org/10.5194/egusphere-2025-4630, 2025
This preprint is open for discussion and under review for The Cryosphere (TC).
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Dry Andean (debris-covered) glaciers and rock glaciers are essential to river runoff by contributing meltwaters in this extremely arid area. We quantify surface lowering for 19 glaciers and 3 debris-covered glaciers, and unchanged velocities for 47 rock glaciers in a ground-truthed and Pléiades satellite imagery based integrative glacier-permafrost study on catchment-scale for 2019-2025. For this period, our findings indicate glacial decline next to permafrost stability.
Charlotte E. Engelmann, Frank Preusser, Alexander Fülling, Jakob Wilk, Elisabeth Eiche, Dennis Quandt, Stefan Hergarten, and Jan H. Blöthe
E&G Quaternary Sci. J., 74, 235–262, https://doi.org/10.5194/egqsj-74-235-2025, https://doi.org/10.5194/egqsj-74-235-2025, 2025
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It is unclear since when and how meso-scale central European river systems have been dominated by human instead of natural influences. Here, the floodplain sediments of the Kinzig River, southwestern Germany, were studied as they recorded natural and human landscape changes. Sediment deposition phases were found, the modern phase of which coincides with increased deposition and heavy metal contaminations that correlate with mining records, indicating that the river system has shifted intensely over 1000 years.
Alexandru Onaca, Flavius Sîrbu, Valentin Poncoş, Christin Hilbich, Tazio Strozzi, Petru Urdea, Răzvan Popescu, Oana Berzescu, Bernd Etzelmüller, Alfred Vespremeanu-Stroe, Mirela Vasile, Delia Teleagă, Dan Birtaş, Iosif Lopătiţă, Simon Filhol, Alexandru Hegyi, and Florina Ardelean
Earth Surf. Dynam., 13, 981–1001, https://doi.org/10.5194/esurf-13-981-2025, https://doi.org/10.5194/esurf-13-981-2025, 2025
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This study establishes a methodology for the study of slow-moving rock glaciers in marginal permafrost and provides the basic knowledge for understanding rock glaciers in South East Europe. By using a combination of different methods (remote sensing, geophysical survey, thermal measurements), we found out that, on the transitional rock glaciers, low ground ice content (i.e. below 20 %) produces horizontal displacements of up to 3 cm per year.
Cassandra E. M. Koenig, Christin Hilbich, Christian Hauck, Lukas U. Arenson, and Pablo Wainstein
The Cryosphere, 19, 2653–2676, https://doi.org/10.5194/tc-19-2653-2025, https://doi.org/10.5194/tc-19-2653-2025, 2025
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This study presents the first regional compilation of borehole temperature data from high-altitude permafrost sites in the Andes, providing a baseline of ground thermal conditions. Data from 53 boreholes show thermal characteristics similar to other mountain permafrost areas, but uniquely shaped by Andean topo-climatic conditions. The study emphasizes the need for ongoing monitoring and is a notable collaboration between industry, academia, and regulators in advancing climate change research.
Julius Kunz, Sebastian Buchelt, Tim Wiegand, Tobias Ullmann, and Christof Kneisel
EGUsphere, https://doi.org/10.5194/egusphere-2025-1671, https://doi.org/10.5194/egusphere-2025-1671, 2025
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Glacier-permafrost interactions in Alpine environments influence geomorphological processes, making it essential to understand the relationship between subsurface structures and surface morphodynamics for predicting landscape evolution under climate change. This study uses applied geophysics and remote sensing methods to investigate this relationship and to reveal the distribution of different ground ice types, as well as the related surface morphodynamics in two alpine glacier forefields.
Clemens Moser, Umberto Morra di Cella, Christian Hauck, and Adrián Flores Orozco
The Cryosphere, 19, 143–171, https://doi.org/10.5194/tc-19-143-2025, https://doi.org/10.5194/tc-19-143-2025, 2025
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We use electrical conductivity and induced polarization in an imaging framework to quantify hydrogeological parameters in the active Gran Sometta rock glacier. The results show high spatial variability in the hydrogeological parameters across the rock glacier and are validated by saltwater tracer tests coupled with 3D electrical conductivity imaging. Hydrogeological information was linked to kinematic data to further investigate its role in rock glacier movement.
Julie Wee, Sebastián Vivero, Tamara Mathys, Coline Mollaret, Christian Hauck, Christophe Lambiel, Jan Beutel, and Wilfried Haeberli
The Cryosphere, 18, 5939–5963, https://doi.org/10.5194/tc-18-5939-2024, https://doi.org/10.5194/tc-18-5939-2024, 2024
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This study highlights the importance of a multi-method and multi-disciplinary approach to better understand the influence of the internal structure of the Gruben glacier-forefield-connected rock glacier and adjacent debris-covered glacier on their driving thermo-mechanical processes and associated surface dynamics. We were able to discriminate glacial from periglacial processes as their spatio-temporal patterns of surface dynamics and geophysical signatures are (mostly) different.
Tamara Mathys, Muslim Azimshoev, Zhoodarbeshim Bektursunov, Christian Hauck, Christin Hilbich, Murataly Duishonakunov, Abdulhamid Kayumov, Nikolay Kassatkin, Vassily Kapitsa, Leo C. P. Martin, Coline Mollaret, Hofiz Navruzshoev, Eric Pohl, Tomas Saks, Intizor Silmonov, Timur Musaev, Ryskul Usubaliev, and Martin Hoelzle
EGUsphere, https://doi.org/10.5194/egusphere-2024-2795, https://doi.org/10.5194/egusphere-2024-2795, 2024
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This study provides a comprehensive geophysical dataset on permafrost in the data-scarce Tien Shan and Pamir mountain regions of Central Asia. It also introduces a novel modeling method to quantify ground ice content across different landforms. The findings indicate that this approach is well-suited for characterizing ice-rich permafrost, which is crucial for evaluating future water availability and assessing risks associated with thawing permafrost.
Mohammad Farzamian, Teddi Herring, Gonçalo Vieira, Miguel Angel de Pablo, Borhan Yaghoobi Tabar, and Christian Hauck
The Cryosphere, 18, 4197–4213, https://doi.org/10.5194/tc-18-4197-2024, https://doi.org/10.5194/tc-18-4197-2024, 2024
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An automated electrical resistivity tomography (A-ERT) system was developed and deployed in Antarctica to monitor permafrost and active-layer dynamics. The A-ERT, coupled with an efficient processing workflow, demonstrated its capability to monitor real-time thaw depth progression, detect seasonal and surficial freezing–thawing events, and assess permafrost stability. Our study showcased the potential of A-ERT to contribute to global permafrost monitoring networks.
Theresa Maierhofer, Adrian Flores Orozco, Nathalie Roser, Jonas K. Limbrock, Christin Hilbich, Clemens Moser, Andreas Kemna, Elisabetta Drigo, Umberto Morra di Cella, and Christian Hauck
The Cryosphere, 18, 3383–3414, https://doi.org/10.5194/tc-18-3383-2024, https://doi.org/10.5194/tc-18-3383-2024, 2024
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In this study, we apply an electrical method in a high-mountain permafrost terrain in the Italian Alps, where long-term borehole temperature data are available for validation. In particular, we investigate the frequency dependence of the electrical properties for seasonal and annual variations along a 3-year monitoring period. We demonstrate that our method is capable of resolving temporal changes in the thermal state and the ice / water ratio associated with seasonal freeze–thaw processes.
Wilfried Haeberli, Lukas U. Arenson, Julie Wee, Christian Hauck, and Nico Mölg
The Cryosphere, 18, 1669–1683, https://doi.org/10.5194/tc-18-1669-2024, https://doi.org/10.5194/tc-18-1669-2024, 2024
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Rock glaciers in ice-rich permafrost can be discriminated from debris-covered glaciers. The key physical phenomenon relates to the tight mechanical coupling between the moving frozen body at depth and the surface layer of debris in the case of rock glaciers, as opposed to the virtually inexistent coupling in the case of surface ice with a debris cover. Contact zones of surface ice with subsurface ice in permafrost constitute diffuse landforms beyond either–or-type landform classification.
Bernd Etzelmüller, Ketil Isaksen, Justyna Czekirda, Sebastian Westermann, Christin Hilbich, and Christian Hauck
The Cryosphere, 17, 5477–5497, https://doi.org/10.5194/tc-17-5477-2023, https://doi.org/10.5194/tc-17-5477-2023, 2023
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Permafrost (permanently frozen ground) is widespread in the mountains of Norway and Iceland. Several boreholes were drilled after 1999 for long-term permafrost monitoring. We document a strong warming of permafrost, including the development of unfrozen bodies in the permafrost. Warming and degradation of mountain permafrost may lead to more natural hazards.
Thomas O. Hoffmann, Yannik Baulig, Stefan Vollmer, Jan H. Blöthe, Karl Auerswald, and Peter Fiener
Earth Surf. Dynam., 11, 287–303, https://doi.org/10.5194/esurf-11-287-2023, https://doi.org/10.5194/esurf-11-287-2023, 2023
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We analyzed more than 440 000 measurements from suspended sediment monitoring to show that suspended sediment concentration (SSC) in large rivers in Germany strongly declined by 50 % between 1990 and 2010. We argue that SSC is approaching the natural base level that was reached during the mid-Holocene. There is no simple explanation for this decline, but increased sediment retention in upstream headwaters is presumably the major reason for declining SSC in the large river channels studied.
Adrian Wicki, Peter Lehmann, Christian Hauck, and Manfred Stähli
Nat. Hazards Earth Syst. Sci., 23, 1059–1077, https://doi.org/10.5194/nhess-23-1059-2023, https://doi.org/10.5194/nhess-23-1059-2023, 2023
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Soil wetness measurements are used for shallow landslide prediction; however, existing sites are often located in flat terrain. Here, we assessed the ability of monitoring sites at flat locations to detect critically saturated conditions compared to if they were situated at a landslide-prone location. We found that differences exist but that both sites could equally well distinguish critical from non-critical conditions for shallow landslide triggering if relative changes are considered.
Jan Mudler, Andreas Hördt, Dennis Kreith, Madhuri Sugand, Kirill Bazhin, Lyudmila Lebedeva, and Tino Radić
The Cryosphere, 16, 4727–4744, https://doi.org/10.5194/tc-16-4727-2022, https://doi.org/10.5194/tc-16-4727-2022, 2022
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The spectral electrical signal of ice exhibits a strong characteristic behaviour in the frequency range from 100 Hz to 100 kHz, due to polarization effects. With our geophysical method, we can analyse this characteristic to detect subsurface ice. Moreover, we use a model to quantify 2-D ground ice content based on our data. The potential of our new measurement device is showed up. Data were taken on a permafrost site in Yakutia, and the results are in agreement with other existing field data.
Karianne S. Lilleøren, Bernd Etzelmüller, Line Rouyet, Trond Eiken, Gaute Slinde, and Christin Hilbich
Earth Surf. Dynam., 10, 975–996, https://doi.org/10.5194/esurf-10-975-2022, https://doi.org/10.5194/esurf-10-975-2022, 2022
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In northern Norway we have observed several rock glaciers at sea level. Rock glaciers are landforms that only form under the influence of permafrost, which is frozen ground. Our investigations show that the rock glaciers are probably not active under the current climate but most likely were active in the recent past. This shows how the Arctic now changes due to climate changes and also how similar areas in currently colder climates will change in the future.
Tamara Mathys, Christin Hilbich, Lukas U. Arenson, Pablo A. Wainstein, and Christian Hauck
The Cryosphere, 16, 2595–2615, https://doi.org/10.5194/tc-16-2595-2022, https://doi.org/10.5194/tc-16-2595-2022, 2022
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With ongoing climate change, there is a pressing need to understand how much water is stored as ground ice in permafrost. Still, field-based data on permafrost in the Andes are scarce, resulting in large uncertainties regarding ground ice volumes and their hydrological role. We introduce an upscaling methodology of geophysical-based ground ice quantifications at the catchment scale. Our results indicate that substantial ground ice volumes may also be present in areas without rock glaciers.
Theresa Maierhofer, Christian Hauck, Christin Hilbich, Andreas Kemna, and Adrián Flores-Orozco
The Cryosphere, 16, 1903–1925, https://doi.org/10.5194/tc-16-1903-2022, https://doi.org/10.5194/tc-16-1903-2022, 2022
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We extend the application of electrical methods to characterize alpine permafrost using the so-called induced polarization (IP) effect associated with the storage of charges at the interface between liquid and solid phases. We investigate different field protocols to enhance data quality and conclude that with appropriate measurement and processing procedures, the characteristic dependence of the IP response of frozen rocks improves the assessment of thermal state and ice content in permafrost.
Christin Hilbich, Christian Hauck, Coline Mollaret, Pablo Wainstein, and Lukas U. Arenson
The Cryosphere, 16, 1845–1872, https://doi.org/10.5194/tc-16-1845-2022, https://doi.org/10.5194/tc-16-1845-2022, 2022
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In view of water scarcity in the Andes, the significance of permafrost as a future water resource is often debated focusing on satellite-detected features such as rock glaciers. We present data from > 50 geophysical surveys in Chile and Argentina to quantify the ground ice volume stored in various permafrost landforms, showing that not only rock glacier but also non-rock-glacier permafrost contains significant ground ice volumes and is relevant when assessing the hydrological role of permafrost.
Martin Hoelzle, Christian Hauck, Tamara Mathys, Jeannette Noetzli, Cécile Pellet, and Martin Scherler
Earth Syst. Sci. Data, 14, 1531–1547, https://doi.org/10.5194/essd-14-1531-2022, https://doi.org/10.5194/essd-14-1531-2022, 2022
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With ongoing climate change, it is crucial to understand the interactions of the individual heat fluxes at the surface and within the subsurface layers, as well as their impacts on the permafrost thermal regime. A unique set of high-altitude meteorological measurements has been analysed to determine the energy balance at three mountain permafrost sites in the Swiss Alps, where data have been collected since the late 1990s in collaboration with the Swiss Permafrost Monitoring Network (PERMOS).
Sebastian Buchelt, Kirstine Skov, Kerstin Krøier Rasmussen, and Tobias Ullmann
The Cryosphere, 16, 625–646, https://doi.org/10.5194/tc-16-625-2022, https://doi.org/10.5194/tc-16-625-2022, 2022
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In this paper, we present a threshold and a derivative approach using Sentinel-1 synthetic aperture radar time series to capture the small-scale heterogeneity of snow cover (SC) and snowmelt. Thereby, we can identify start of runoff and end of SC as well as perennial snow and SC extent during melt with high spatiotemporal resolution. Hence, our approach could support monitoring of distribution patterns and hydrological cascading effects of SC from the catchment scale to pan-Arctic observations.
Bernd Etzelmüller, Justyna Czekirda, Florence Magnin, Pierre-Allain Duvillard, Ludovic Ravanel, Emanuelle Malet, Andreas Aspaas, Lene Kristensen, Ingrid Skrede, Gudrun D. Majala, Benjamin Jacobs, Johannes Leinauer, Christian Hauck, Christin Hilbich, Martina Böhme, Reginald Hermanns, Harald Ø. Eriksen, Tom Rune Lauknes, Michael Krautblatter, and Sebastian Westermann
Earth Surf. Dynam., 10, 97–129, https://doi.org/10.5194/esurf-10-97-2022, https://doi.org/10.5194/esurf-10-97-2022, 2022
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This paper is a multi-authored study documenting the possible existence of permafrost in permanently monitored rockslides in Norway for the first time by combining a multitude of field data, including geophysical surveys in rock walls. The paper discusses the possible role of thermal regime and rockslide movement, and it evaluates the possible impact of atmospheric warming on rockslide dynamics in Norwegian mountains.
Adrian Wicki, Per-Erik Jansson, Peter Lehmann, Christian Hauck, and Manfred Stähli
Hydrol. Earth Syst. Sci., 25, 4585–4610, https://doi.org/10.5194/hess-25-4585-2021, https://doi.org/10.5194/hess-25-4585-2021, 2021
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Soil moisture information was shown to be valuable for landslide prediction. Soil moisture was simulated at 133 sites in Switzerland, and the temporal variability was compared to the regional occurrence of landslides. We found that simulated soil moisture is a good predictor for landslides, and that the forecast goodness is similar to using in situ measurements. This encourages the use of models for complementing existing soil moisture monitoring networks for regional landslide early warning.
Timea Katona, Benjamin Silas Gilfedder, Sven Frei, Matthias Bücker, and Adrian Flores-Orozco
Biogeosciences, 18, 4039–4058, https://doi.org/10.5194/bg-18-4039-2021, https://doi.org/10.5194/bg-18-4039-2021, 2021
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We used electrical geophysical methods to map variations in the rates of microbial activity within a wetland. Our results show that the highest electrical conductive and capacitive properties relate to the highest concentrations of phosphates, carbon, and iron; thus, we can use them to characterize the geometry of the biogeochemically active areas or hotspots.
Celia A. Baumhoer, Andreas J. Dietz, Christof Kneisel, Heiko Paeth, and Claudia Kuenzer
The Cryosphere, 15, 2357–2381, https://doi.org/10.5194/tc-15-2357-2021, https://doi.org/10.5194/tc-15-2357-2021, 2021
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We present a record of circum-Antarctic glacier and ice shelf front change over the last two decades in combination with potential environmental variables forcing frontal retreat. Along the Antarctic coastline, glacier and ice shelf front retreat dominated between 1997–2008 and advance between 2009–2018. Decreasing sea ice days, intense snowmelt, weakening easterly winds, and relative changes in sea surface temperature were identified as enabling factors for glacier and ice shelf front retreat.
Christian Halla, Jan Henrik Blöthe, Carla Tapia Baldis, Dario Trombotto Liaudat, Christin Hilbich, Christian Hauck, and Lothar Schrott
The Cryosphere, 15, 1187–1213, https://doi.org/10.5194/tc-15-1187-2021, https://doi.org/10.5194/tc-15-1187-2021, 2021
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In the semi-arid to arid Andes of Argentina, rock glaciers contain invisible and unknown amounts of ground ice that could become more important in future for the water availability during the dry season. The study shows that the investigated rock glacier represents an important long-term ice reservoir in the dry mountain catchment and that interannual changes of ground ice can store and release significant amounts of annual precipitation.
Matthias Bücker, Adrián Flores Orozco, Jakob Gallistl, Matthias Steiner, Lukas Aigner, Johannes Hoppenbrock, Ruth Glebe, Wendy Morales Barrera, Carlos Pita de la Paz, César Emilio García García, José Alberto Razo Pérez, Johannes Buckel, Andreas Hördt, Antje Schwalb, and Liseth Pérez
Solid Earth, 12, 439–461, https://doi.org/10.5194/se-12-439-2021, https://doi.org/10.5194/se-12-439-2021, 2021
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We use seismic, electromagnetic, and geoelectrical methods to assess sediment thickness and lake-bottom geology of two karst lakes. An unexpected drainage event provided us with the unusual opportunity to compare water-borne measurements with measurements carried out on the dry lake floor. The resulting data set does not only provide insight into the specific lake-bottom geology of the studied lakes but also evidences the potential and limitations of the employed field methods.
Johannes Buckel, Eike Reinosch, Andreas Hördt, Fan Zhang, Björn Riedel, Markus Gerke, Antje Schwalb, and Roland Mäusbacher
The Cryosphere, 15, 149–168, https://doi.org/10.5194/tc-15-149-2021, https://doi.org/10.5194/tc-15-149-2021, 2021
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This study presents insights into the remote cryosphere of a mountain range at the Tibetan Plateau. Small-scaled studies and field data about permafrost occurrence are very scarce. A multi-method approach (geomorphological mapping, geophysics, InSAR time series analysis) assesses the lower occurrence of permafrost the range of 5350 and 5500 m above sea level (a.s.l.) in the Qugaqie basin. The highest, multiannual creeping rates up to 150 mm/yr are observed on rock glaciers.
Cited articles
Arenson, L. U., Harrington, J. S., Koenig, C. E. M., and Wainstein, P. A.:
Mountain Permafrost Hydrology – A Practical Review Following Studies from
the Andes, Geosci., 12, 48, https://doi.org/10.3390/geosciences12020048, 2022.
Ballantyne, C. K.: Periglacial geomorphology, first edn., J. Wiley and
& Sons, Wiley-Blackwell, Oxford, ISBN 978-1-405-10006-9, https://doi.org/10.1002/ppp.2108, 2018.
Barsch, D.: Rockglaciers: Indicators for the Present and Former Geoecology
in High Mountain Environments, Springer Berlin Heidelberg,
Berlin, Heidelberg, Softcover ISBN 978-3-642-80095-5,
https://doi.org/10.1007/978-3-642-80093-1, 1996.
Barsch, D. and King, L.: Origin and geoelectrical resistivity of
rockglaciers in semi-arid subtropical mountains (Andes of Mendoza,
Argentinia), Z. Geomorphol., 33, 151–163,
https://doi.org/10.1127/zfg/33/1989/151, 1989.
Beniston, M., Farinotti, D., Stoffel, M., Andreassen, L. M., Coppola, E., Eckert, N., Fantini, A., Giacona, F., Hauck, C., Huss, M., Huwald, H., Lehning, M., López-Moreno, J.-I., Magnusson, J., Marty, C., Morán-Tejéda, E., Morin, S., Naaim, M., Provenzale, A., Rabatel, A., Six, D., Stötter, J., Strasser, U., Terzago, S., and Vincent, C.: The European mountain cryosphere: a review of its current state, trends, and future challenges, The Cryosphere, 12, 759–794, https://doi.org/10.5194/tc-12-759-2018, 2018.
Biskaborn, B. K., Smith, S. L., Noetzli, J., Matthes, H., Vieira, G.,
Streletskiy, D. A., Schoeneich, P., Romanovsky, V. E., Lewkowicz, A. G.,
Abramov, A., Allard, M., Boike, J., Cable, W. L., Christiansen, H. H.,
Delaloye, R., Diekmann, B., Drozdov, D., Etzelmüller, B., Grosse, G.,
Guglielmin, M., Ingeman-Nielsen, T., Isaksen, K., Ishikawa, M., Johansson,
M., Johannsson, H., Joo, A., Kaverin, D., Kholodov, A., Konstantinov, P.,
Kröger, T., Lambiel, C., Lanckman, J. P., Luo, D., Malkova, G.,
Meiklejohn, I., Moskalenko, N., Oliva, M., Phillips, M., Ramos, M., Sannel,
A. B. K., Sergeev, D., Seybold, C., Skryabin, P., Vasiliev, A., Wu, Q.,
Yoshikawa, K., Zheleznyak, M., and Lantuit, H.: Permafrost is warming at a
global scale, Nat. Commun., 10, 264, https://doi.org/10.1038/s41467-018-08240-4,
2019.
Blöthe, J. H., Halla, C., Schwalbe, E., Bottegal, E., Trombotto Liaudat,
D., and Schrott, L.: Surface velocity fields of active rock glaciers and
ice-debris complexes in the Central Andes of Argentina, Earth Surf. Proc.
Land., 46, 504–522, https://doi.org/10.1002/esp.5042, 2020.
Buckel, J. and Gardeweg, R.: Identifying mountain permafrost degradation by repeating historical ERT-measurements – supplement (V1.1), Zenodo [data set], https://doi.org/10.5281/zenodo.7348526, 2022.
Buckel, J., Reinosch, E., Hördt, A., Zhang, F., Riedel, B., Gerke, M., Schwalb, A., and Mäusbacher, R.: Insights into a remote cryosphere: a multi-method approach to assess permafrost occurrence at the Qugaqie basin, western Nyainqêntanglha Range, Tibetan Plateau, The Cryosphere, 15, 149–168, https://doi.org/10.5194/tc-15-149-2021, 2021.
Buckel, J., Reinosch, E., Voigtländer, A., Dietze, M., Bücker, M.,
Krebs, N., Schroeckh, R., Mäusbacher, R., and Hördt, A.: Rock glacier
characteristics under semiarid climate conditions in the Western
Nyainqêntanglha range, Tibetan Plateau, J. Geophys. Res.-Earth,
127, e2021JF006256, https://doi.org/10.1029/2021jf006256, 2022.
Cardarelli, E. and De Donno, G.: Chapter 2 – Advances in electric
resistivity tomography: Theory and case studies, in: Innovation in
Near-Surface Geophysics, edited by: R. Persico, S. Piro, and N. Linford,
Elsevier, 23–57, ISBN 9780128124291,
https://doi.org/10.1016/B978-0-12-812429-1.00002-7, 2019.
Chiarle, M., Geertsema, M., Mortara, G., and Clague, J. J.: Relations between
climate change and mass movement: Perspectives from the Canadian Cordillera
and the European Alps, Glob. Planet. Change, 202, 103499,
https://doi.org/10.1016/j.gloplacha.2021.103499, 2021.
Deline, P., Gruber, S., Delaloye, R., Fischer, L., Geertsema, M., Giardino,
M., Hasler, A., Kirkbride, M., Krautblatter, M., Magnin, F., McColl, S.,
Ravanel, L., and Schoeneich, P.: Ice Loss and Slope Stability in
High-Mountain Regions, in: Snow and Ice-Related Hazards, Risks and Disasters,
edited by: Shroder, J. F., Haeberli, W., and Whiteman, C.,
Academic Press, Boston, 521–561, ISBN 9780123948496,
https://doi.org/10.1016/B978-0-12-394849-6.00015-9, 2015.
Duvillard, P.-A., Ravanel, L., Marcer, M., and Schoeneich, P.: Recent
evolution of damage to infrastructure on permafrost in the French Alps, Reg.
Environ. Chang., 19, 1281–1293, https://doi.org/10.1007/s10113-019-01465-z, 2019.
Emmert, A. and Kneisel, C.: Internal structure of two alpine rock glaciers investigated by quasi-3-D electrical resistivity imaging, The Cryosphere, 11, 841–855, https://doi.org/10.5194/tc-11-841-2017, 2017.
Eriksen, H., Rouyet, L., Lauknes, T. R., Berthling, I., Isaksen, K.,
Hindberg, H., Larsen, Y., and Corner, G. D.: Recent Acceleration of a Rock
Glacier Complex, Ádjet, Norway, Documented by 62 Years of Remote Sensing
Observations, Geophys. Res. Lett., 45, 8314–8323,
https://doi.org/10.1029/2018GL077605, 2018.
Etzelmüller, B., Guglielmin, M., Hauck, C., Hilbich, C., Hoelzle, M.,
Isaksen, K., Noetzli, J., Oliva, M., and Ramos, M.: Twenty years of European
mountain permafrost dynamics-the PACE legacy, Environ. Res. Lett., 15, 104070,
https://doi.org/10.1088/1748-9326/abae9d, 2020.
Farzamian, M., Vieira, G., Monteiro Santos, F. A., Yaghoobi Tabar, B., Hauck, C., Paz, M. C., Bernardo, I., Ramos, M., and de Pablo, M. A.: Detailed detection of active layer freeze–thaw dynamics using quasi-continuous electrical resistivity tomography (Deception Island, Antarctica), The Cryosphere, 14, 1105–1120, https://doi.org/10.5194/tc-14-1105-2020, 2020.
Fisch Sr., W., Fisch Jr., W., and Haeberli, W.: Electrical DC resistivity
soundings with long profiles on rock glaciers and moraines in the alps of
Switzerland, Zeitschrift für Gletscherkd. und Glaziolgeologie, 13,
239–260, 1977.
Fortier, R., Allard, M., and Seguin, M. K.: Effect of physical properties of
frozen ground on electrical resistivity logging, Cold Reg. Sci. Technol.,
22, 361–384, https://doi.org/10.1016/0165-232X(94)90021-3, 1994.
Frauenfelder, R.: Regional-scale modelling of the occurrence and dynamics of
rockglaciers and the distribution of paleopermafrost, Schriftenreihe Physische Geographie, Glaziologie und Geomorphodynamik, 45, University of Zurich,
2005.
Frauenfelder, R., Laustela, M., and Kääb, A.: Relative age dating of
Alpine rockglacier surfaces, Z. Geomorphol., 49, 145–166,
2005.
Frauenfelder, R., Hauck, C., Hilbich, C., Kneisel, C., and Hoelzle, M.: An
integrative observation of kinematics and geophysical parameters of Gianda
Grischa rockglacier, Upper Engadine, Swiss Alps, in: Proceedings of the 9th
International Conference on Permafrost, Fairbanks, Alaska, vol. 8, edited by:
Kane, D. L. and Hinkel, K. M., Institute of Northern
Engineering, University of Alaska Fairbanks, Fairbanks, Alaska, 463–468, https://www.permafrost.org/event/icop9/ (last access: 6 July 2023), 2008.
Frauenfelder, R., Isaksen, K., Lato, M. J., and Noetzli, J.: Ground thermal and geomechanical conditions in a permafrost-affected high-latitude rock avalanche site (Polvartinden, northern Norway), The Cryosphere, 12, 1531–1550, https://doi.org/10.5194/tc-12-1531-2018, 2018.
Fukui, K.: Permafrost and Surface Movement of the Protalus Rampart in the
Kuranosuke Cirque, Tateyama Mountains, Japan, Journal of Geography (Chigaku Zasshi),
111, 564–573, https://doi.org/10.5026/jgeography.111.4_564, 2002.
Haberkorn, A., Kenner, R., Noetzli, J., and Phillips, M.: Changes in Ground
Temperature and Dynamics in Mountain Permafrost in the Swiss Alps, Front.
Earth Sci., 9, https://doi.org/10.3389/feart.2021.626686, 2021.
Haeberli, W., Hoelzle, M., Keller, F., Schmid, W., Muhll, S. V., and Wagner,
S.: Monitoring the long-term evolution of mountain permafrost in the Swiss
Alps, Proc. 6th Int. Conf. Permafrost, Beijing, China, 214–219, 1993.
Haeberli, W., Hallet, B., Arenson, L., Elconin, R., Humlum, O.,
Kääb, A., Kaufmann, V., Ladanyi, B., Matsuoka, N., Springman, S.,
and Mühll, D. V.: Permafrost creep and rock glacier dynamics,
Permafr. Periglac. Process., 17, 189–214, https://doi.org/10.1002/ppp.561, 2006.
Haeberli, W., Schaub, Y., and Huggel, C.: Increasing risks related to
landslides from degrading permafrost into new lakes in de-glaciating
mountain ranges, Geomorphology, 293, 405–417,
https://doi.org/10.1016/j.geomorph.2016.02.009, 2017.
Halla, C., Blöthe, J. H., Tapia Baldis, C., Trombotto Liaudat, D., Hilbich, C., Hauck, C., and Schrott, L.: Ice content and interannual water storage changes of an active rock glacier in the dry Andes of Argentina, The Cryosphere, 15, 1187–1213, https://doi.org/10.5194/tc-15-1187-2021, 2021.
Harris, C., Arenson, L. U., Christiansen, H. H., Etzelmüller, B.,
Frauenfelder, R., Gruber, S., Haeberli, W., Hauck, C., Hölzle, M.,
Humlum, O., Isaksen, K., Kääb, A., Kern-Lütschg, M. A., Lehning,
M., Matsuoka, N., Murton, J. B., Nötzli, J., Phillips, M., Ross, N.,
Seppälä, M., Springman, S. M., and Vonder Mühll, D.: Permafrost
and climate in Europe: Monitoring and modelling thermal, geomorphological
and geotechnical responses, Earth-Sci. Rev., 92, 117–171,
https://doi.org/10.1016/j.earscirev.2008.12.002, 2009.
Hartl, L., Zieher, T., Bremer, M., Stocker-Waldhuber, M., Zahs, V., Höfle, B., Klug, C., and Cicoira, A.: Multi-sensor monitoring and data integration reveal cyclical destabilization of the Äußeres Hochebenkar rock glacier, Earth Surf. Dynam., 11, 117–147, https://doi.org/10.5194/esurf-11-117-2023, 2023.
Hauck, C.: Frozen ground monitoring using DC resistivity tomography,
Geophys. Res. Lett., 29, 12-1–12-4, https://doi.org/10.1029/2002GL014995, 2002.
Hauck, C.: IPA Action Group: Towards an International Database of Geoelectrical Surveys on Permafrost (IDGSP), University of Fribourg [data set], https://www.unifr.ch/geo/cryosphere/en/projects/permafrost-monitoring-and-dynamics/idgsp.html, last access: 15 June 2022.
Hauck, C. and Kneisel, C.: Applied Geophysics in Periglacial Environments,
Cambridge University Press, Cambridge, https://doi.org/10.1017/CBO9780511535628, 2008.
Hauck, C. and Vonder Mühll, D.: Evaluation of geophysical techniques for
application in mountain permafrost studies, Zeitschrift für Geomorphologie, Supplementband, 132, 161–190, 2003.
Hauck, C., Vonder Mühll, D. and Maurer, H.: Using DC resistivity
tomography to detect and characterize mountain permafrost, Geophys.
Prospect., 51, 273–284, https://doi.org/10.1046/j.1365-2478.2003.00375.x, 2003.
Hauck, C., Hilbich, C., Coline, M., and Pellet, C.: Permafrost monitoring by
reprocessing and repeating historical geoelectrical measurements, in EGU
General Assembly 2020, online, 4–8 May 2020, EGU2020-14047, https://presentations.copernicus.org/EGU2020/EGU2020-14047_presentation.pdf
(last access: 6 July 2023), 2020.
Herring, T. and Lewkowicz, A. G.: A systematic evaluation of electrical
resistivity tomography for permafrost interface detection using forward
modeling, Permafr. Periglac. Process., 33, 134–146,
https://doi.org/10.1002/ppp.2141, 2022.
Hilbich, C., Hauck, C., Hoelzle, M., Scherler, M., Schudel, L., Völksch,
I., Vonder Mühll, D., and Mäusbacher, R.: Monitoring mountain
permafrost evolution using electrical resistivity tomography: A 7-year study
of seasonal, annual, and long-term variations at Schilthorn, Swiss Alps, J.
Geophys. Res.-Earth, 113, F01S90, https://doi.org/10.1029/2007JF000799, 2008.
Hilbich, C., Marescot, L., Hauck, C., Loke, M. H., and Mausbacher, R.:
Applicability of electrical resistivity tomography monitoring to coarse
blocky and ice-rich permafrost landforms, Permafr. Periglac. Process.,
20, 269–284, https://doi.org/10.1002/ppp.652, 2009.
Hilbich, C., Fuss, C., and Hauck, C.: Automated time-lapse ERT for improved
process analysis and monitoring of frozen ground, Permafr. Periglac.
Process., 22, 306–319, https://doi.org/10.1002/ppp.732, 2011.
Hilbich, C., Hauck, C., Mollaret, C., Wainstein, P., and Arenson, L. U.: Towards accurate quantification of ice content in permafrost of the Central Andes – Part 1: Geophysics-based estimates from three different regions, The Cryosphere, 16, 1845–1872, https://doi.org/10.5194/tc-16-1845-2022, 2022.
Hock, R., Rasul, G., Adler, C., Cáceres, B., Gruber, S., Hirabayashi,
Y., Jackson, M., Kääb, A., Kang, S., Kutuzov, S., Milner, A., Molau,
U., Morin, S., Orlove, B., and Steltzer, H.: High Mountain Areas, in
IPCC Special Report on the Ocean and Cryosphere in a Changing Climate,
edited by: Pörtner, H.-O., Roberts, D. C., Tignor, M., Poloczanska, E. S., Mintenbeck, K., Alegría, A., Craig, M., Langsdorf, S., Löschke, S., Möller, V., Okem, A., and Rama, B., The Intergovernmental Panel on
Climate Change (IPCC), 94 pp., https://doi.org/10.1017/9781009157964.004, 2019.
Hoelzle, M., Hauck, C., Mathys, T., Noetzli, J., Pellet, C., and Scherler, M.: Long-term energy balance measurements at three different mountain permafrost sites in the Swiss Alps, Earth Syst. Sci. Data, 14, 1531–1547, https://doi.org/10.5194/essd-14-1531-2022, 2022.
Hördt, A., Weidelt, P., and Przyklenk, A.: Contact impedance of grounded
and capacitive electrodes, Geophys. J. Int., 193, 187–196,
https://doi.org/10.1093/gji/ggs091, 2013.
Jones, D. B., Harrison, S., Anderson, K., and Betts, R. A.: Mountain rock
glaciers contain globally significant water stores, Sci. Rep., 8, 2834,
https://doi.org/10.1038/s41598-018-21244-w, 2018.
Kellerer-Pirklbauer, A. and Kaufmann, V.: Deglaciation and its impact on
permafrost and rock glacier evolution: New insight from two adjacent cirques
in Austria, Sci. Total Environ., 621, 1397–1414,
https://doi.org/10.1016/j.scitotenv.2017.10.087, 2018.
Kenner, R., Phillips, M., Hauck, C., Hilbich, C., Mulsow, C., Bühler,
Y., Stoffel, A., and Buchroithner, M.: New insights on permafrost genesis and
conservation in talus slopes based on observations at Flüelapass,
Eastern Switzerland, Geomorphology, 290, 101–113,
https://doi.org/10.1016/j.geomorph.2017.04.011, 2017.
Kenner, R., Noetzli, J., Hoelzle, M., Raetzo, H., and Phillips, M.: Distinguishing ice-rich and ice-poor permafrost to map ground temperatures and ground ice occurrence in the Swiss Alps, The Cryosphere, 13, 1925–1941, https://doi.org/10.5194/tc-13-1925-2019, 2019.
Keuschnig, M., Krautblatter, M., Hartmeyer, I., Fuss, C., and Schrott, L.:
Automated Electrical Resistivity Tomography Testing for Early Warning in
Unstable Permafrost Rock Walls Around Alpine Infrastructure, Permafrost Periglac. Process., 171, 158–171, https://doi.org/10.1002/ppp.1916, 2017.
King, L., Fisch Sr., W., Haeberli, W., and Wächter, H. P.: Comparison of
resistivity and radio-echo soundings on rock glacier permafrost, Zeitschrift
für Gletscherkd. und Glaziolgeologie, 23, 77–97, 1987.
Kneisel, C. and Hauck, C.: Electrical methods, in: Applied Geophysics in
Periglacial Environments, https://doi.org/10.1017/CBO9780511535628.002, 2008.
Kneisel, C., Hauck, C., and Mühll, D. V.: Permafrost below the Timberline
confirmed and characterized by geoelectrical resistivity measurements, Bever
Valley, eastern Swiss Alps, Permafr. Periglac. Process., 11, 295–304,
https://doi.org/10.1002/1099-1530(200012)11:4<295::AID-PPP353>3.0.CO;2-L, 2000.
Kneisel, C., Hauck, C., Fortier, R., and Moorman, B.: Advances in geophysical
methods for permafrost investigations, Permafr. Periglac. Process., 19,
157–178, https://doi.org/10.1002/ppp.616, 2008.
Kneisel, C., Rödder, T., and Schwindt, D.: Frozen ground dynamics
resolved by multi-year and year-round electrical resistivity monitoring at
three alpine sites in the Swiss Alps, Near Surf. Geophys., 12, 117–132,
2014.
Krautblatter, M. and Hauck, C.: Electrical resistivity tomography monitoring
of permafrost in solid rock walls, J. Geophys. Res.-Earth, 112,
F02S20, https://doi.org/10.1029/2006JF000546, 2007.
Krautblatter, M., Verleysdonk, S., Flores-Orozco, A. A., and Kemna, A.:
Temperature-calibrated imaging of seasonal changes in permafrost rock walls
by quantitative electrical resistivity tomography (Zugspitze,
German/Austrian Alps), J. Geophys. Res.-Earth, 115, F02003,
https://doi.org/10.1029/2008JF001209, 2010.
Kuras, O., Beamish, D., Meldrum, P. I., and Ogilvy, R. D.: Fundamentals of
the capacitive resistivity technique, Geophysics, 71,
G135–G152, https://doi.org/10.1190/1.2194892, 2006.
Lambiel, C. and Pieracci, K.: Permafrost distribution in talus slopes
located within the alpine periglacial belt, Swiss Alps, Permafr. Periglac.
Process., 19, 293–304, 2008.
Loke, M. H. and Barker, R. D.: Least-squares deconvolution of apparent
resistivity pseudosections, Geophysics, 60, 1682–1690,
https://doi.org/10.1190/1.1443900, 1995.
Magnin, F., Krautblatter, M., Deline, P., Ravanel, L., Malet, E., and
Bevington, A.: Determination of warm, sensitive permafrost areas in
near-vertical rockwalls and evaluation of distributed models by electrical
resistivity tomography, J. Geophys. Res.-Earth, 120, 745–762,
https://doi.org/10.1002/2014JF003351, 2015.
Magnin, F., Josnin, J.-Y., Ravanel, L., Pergaud, J., Pohl, B., and Deline, P.: Modelling rock wall permafrost degradation in the Mont Blanc massif from the LIA to the end of the 21st century, The Cryosphere, 11, 1813–1834, https://doi.org/10.5194/tc-11-1813-2017, 2017.
Marcer, M., Cicoira, A., Cusicanqui, D., Bodin, X., Echelard, T., Obregon,
R., and Schoeneich, P.: Rock glaciers throughout the French Alps accelerated
and destabilised since 1990 as air temperatures increased, Commun. Earth
Environ., 2, 81, https://doi.org/10.1038/s43247-021-00150-6, 2021.
Maurer, H. and Hauck, C.: Instruments and methods: Geophysical imaging of
alpine rock glaciers, J. Glaciol., 53, 110–120,
https://doi.org/10.3189/172756507781833893, 2007.
Mewes, B., Hilbich, C., Delaloye, R., and Hauck, C.: Resolution capacity of geophysical monitoring regarding permafrost degradation induced by hydrological processes, The Cryosphere, 11, 2957–2974, https://doi.org/10.5194/tc-11-2957-2017, 2017.
Mollaret, C., Hilbich, C., Pellet, C., Flores-Orozco, A., Delaloye, R., and Hauck, C.: Mountain permafrost degradation documented through a network of permanent electrical resistivity tomography sites, The Cryosphere, 13, 2557–2578, https://doi.org/10.5194/tc-13-2557-2019, 2019.
Mourey, J., Lacroix, P., Duvillard, P.-A., Marsy, G., Marcer, M., Malet, E., and Ravanel, L.: Multi-method monitoring of rockfall activity along the classic route up Mont Blanc (4809 m a.s.l.) to encourage adaptation by mountaineers, Nat. Hazards Earth Syst. Sci., 22, 445–460, https://doi.org/10.5194/nhess-22-445-2022, 2022.
Mudler, J., Hördt, A., Przyklenk, A., Fiandaca, G., Maurya, P. K., and Hauck, C.: Two-dimensional inversion of wideband spectral data from the capacitively coupled resistivity method – first applications in periglacial environments, The Cryosphere, 13, 2439–2456, https://doi.org/10.5194/tc-13-2439-2019, 2019.
Oldenborger, G. A. and LeBlanc, A. M.: Monitoring changes in unfrozen water
content with electrical resistivity surveys in cold continuous permafrost,
Geophys. J. Int., 215, 965–977, https://doi.org/10.1093/GJI/GGY321, 2018.
Otto, J. C. and Smith, M. J.: Geomorphological mapping, in: Geomorphological
Techniques, edited by: Clarke, L., British Society for Geomorphology, https://www.researchgate.net/publication/257263871_Geomorphological_Mapping (last access: 6 July 2023), 2013.
Otto, J. C., Keuschnig, M., Götz, J., Marbach, M., and Schrott, L.:
Detection of mountain permafrost by combining high resolution surface and
subsurface information – an example from the glatzbach catchment, austrian
alps, Geogr. Ann. Ser. A Phys. Geogr., 94, 43–57,
https://doi.org/10.1111/j.1468-0459.2012.00455.x, 2012.
Palacky, G. J.: 3. Resistivity Characteristics of Geologic Targets, in
Electromagnetic Methods in Applied Geophysics: Volume 1, Theory,
Society of Exploration Geophysicists, 52–129, https://doi.org/10.1190/1.9781560802631.ch3, 1988.
Patton, A. I., Rathburn, S. L., and Capps, D. M.: Landslide response to
climate change in permafrost regions, Geomorphology, 340, 116–128,
https://doi.org/10.1016/j.geomorph.2019.04.029, 2019.
Pavoni, M., Carrera, A., and Boaga, J.: Improving the galvanic contact
resistance for geoelectrical measurements in debris areas: A case study,
Near Surf. Geophys., 20, 178–191, https://doi.org/10.1002/nsg.12192, 2022.
PERMOS: Swiss Permafrost Bulletin 2019/2020, edited by: Noetzli, J. and
Pellet, C., Swiss Permafrost Monitoring Network (PERMOS), https://www.permos.ch/fileadmin/Files/publications/swiss_permafrost_bulletin/PERMOS_bulletin_2020.pdf (last
access: 6 July 2023), 2021.
Pogliotti, P., Guglielmin, M., Cremonese, E., Morra di Cella, U., Filippa, G., Pellet, C., and Hauck, C.: Warming permafrost and active layer variability at Cime Bianche, Western European Alps, The Cryosphere, 9, 647–661, https://doi.org/10.5194/tc-9-647-2015, 2015.
Reinosch, E., Buckel, J., Dong, J., Gerke, M., Baade, J., and Riedel, B.: InSAR time series analysis of seasonal surface displacement dynamics on the Tibetan Plateau, The Cryosphere, 14, 1633–1650, https://doi.org/10.5194/tc-14-1633-2020, 2020.
Rosset, E., Hilbich, C., Schneider, S., and Hauck, C.: Automatic filtering of
ERT monitoring data in mountain permafrost, Near Surf. Geophys., 11,
423–434, https://doi.org/10.3997/1873-0604.2013003, 2013.
Rücker, C. and Günther, T.: The simulation of finite ERT electrodes
using the complete electrode model, Geophysics, 76, F227–F238,
https://doi.org/10.1190/1.3581356, 2011.
Sass, O. and Viles, H. A.: How wet are these walls? Testing a novel
technique for measuring moisture in ruined walls, J. Cult. Herit., 7,
257–263, https://doi.org/10.1016/j.culher.2006.08.001, 2006.
Scapozza, C.: Investigation on protalus ramparts in the Swiss Alps, Geogr.
Helv., 70, 135–139, https://doi.org/10.5194/gh-70-135-2015, 2015.
Scapozza, C., Lambiel, C., Baron, L., Marescot, L., and Reynard, E.: Internal
structure and permafrost distribution in two alpine periglacial talus
slopes, Valais, Swiss Alps, Geomorphology, 132, 208–221,
https://doi.org/10.1016/j.geomorph.2011.05.010, 2011.
Scherler, M., Hauck, C., Hoelzle, M., and Salzmann, N.: Modeled sensitivity
of two alpine permafrost sites to RCM-based climate scenarios, J. Geophys.
Res.-Earth, 118, 780–794, https://doi.org/10.1002/jgrf.20069, 2013.
Schneider, S., Hoelzle, M., and Hauck, C.: Influence of surface and subsurface heterogeneity on observed borehole temperatures at a mountain permafrost site in the Upper Engadine, Swiss Alps, The Cryosphere, 6, 517–531, https://doi.org/10.5194/tc-6-517-2012, 2012.
Schneider, S., Daengeli, S., Hauck, C., and Hoelzle, M.: A spatial and temporal analysis of different periglacial materials by using geoelectrical, seismic and borehole temperature data at Murtèl–Corvatsch, Upper Engadin, Swiss Alps, Geogr. Helv., 68, 265–280, https://doi.org/10.5194/gh-68-265-2013, 2013.
Schrott, L. and Sass, O.: Application of field geophysics in geomorphology:
advances and limitations exemplified by case studies, Geomorphology,
93, 55–73, https://doi.org/10.1016/j.geomorph.2006.12.024, 2008.
Smith, S. L., O'Neill, H. B., Isaksen, K., Noetzli, J., and Romanovsky, V.
E.: The changing thermal state of permafrost, Nat. Rev. Earth Environ.,
3, 10–23, https://doi.org/10.1038/s43017-021-00240-1, 2022.
Spicher, A.: Tektonische Karte der Schweiz 1:500 000, Carte tectonique de la Suisse 1:500 000, 2nd edn., Schweizerische Geologische Kommission, 1980.
Stingl, H., Garleff, K., Höfner, T., Huwe, B., Jaesche, P., John, B., and
Veit, H.: Grundfragen des alpinen Periglazials – Ergebnisse, Probleme und
Perspektiven periglazialmorphologischer Untersuchungen im Langzeitprojekt
“Glorer Hütte” in der Südlichen Glockner-/Nördlichen Schobergruppe (Südliche Hohe Tauern, Osttirol), Salzburg,
Geogr. Arb., 15–42, ISBN 978-3-85283-030-3, 2010.
Supper, R., Ottowitz, D., Jochum, B., Römer, A., Pfeiler, S., Kauer, S.,
Keuschnig, M., and Ita, A.: Geoelectrical monitoring of frozen ground and
permafrost in alpine areas: Field studies and considerations towards an
improved measuring technology, Near Surf. Geophys., 12, 93–115,
https://doi.org/10.3997/1873-0604.2013057, 2014.
Tang, L., Wang, X., Lan, F., Qiu, P., and Jin, L.: Measuring the content of
unfrozen water in frozen soil based on resistivity, Int. J. Electrochem.
Sci., 15, 9459–9472, https://doi.org/10.20964/2020.09.57, 2020.
Tomaškovičová, S., Ingeman-Nielsen, T., Christiansen, A. V.,
Brandt, I., Dahlin, T., and Elberling, B.: Effect of electrode shape on
grounding resistances – Part 2: Experimental results and cryospheric
monitoring, Geophysics, 81, WA159–WA172, https://doi.org/10.1190/GEO2015-0148.1,
2016.
Uhlemann, S. and Kuras, O.: Numerical Simulations of Capacitive Resistivity Imaging (CRI) Measurements, Near Surf. Geophys., 12, 523–537, https://doi.org/10.3997/1873-0604.2014008, 2014.
Uhlemann, S., Dafflon, B., Peterson, J., Ulrich, C., Shirley, I., Michail,
S., and Hubbard, S. S.: Geophysical Monitoring Shows that Spatial
Heterogeneity in Thermohydrological Dynamics Reshapes a Transitional
Permafrost System, Geophys. Res. Lett., 48, e2020GL091149, https://doi.org/10.1029/2020GL091149,
2021.
Villarroel, C. D., Ortiz, D. A., Forte, A. P., Tamburini Beliveau, G.,
Ponce, D., Imhof, A., and López, A.: Internal structure of a large,
complex rock glacier and its significance in hydrological and dynamic
behavior: A case study in the semi-arid Andes of Argentina, Permafr.
Periglac. Process., 33, 78–95, https://doi.org/10.1002/ppp.2132, 2021.
Vonder Mühll, D. and Haeberli, W.: Thermal characteristics of the
permafrost within an active rock glacier (Murtèl/Corvatsch, Grisons,
Swiss Alps), J. Glaciol., 36, 151–158,
https://doi.org/10.3189/S0022143000009382, 1990.
Vonder Mühll, D., Hauck, C., and Gubler, H.: Mapping of mountain
permafrost using geophysical methods, Prog. Phys. Geogr., 26, 643–660,
https://doi.org/10.1191/0309133302pp356ra, 2002.
Vonder Mühll, D., Nötzli, J., and Roer, I.: PERMOS – A comprehensive
monitoring network of mountain permafrost in the Swiss Alps, Proc. 9th Int.
Conf. Permafr., 1869–1874, https://www.permafrost.org/event/icop9/ (last access: 6 July 2023), 2008.
ZAMG: Jahrbuch der Zamg, Vienna, Austria, https://www.zamg.ac.at/cms/de/klima/klimauebersichten/jahrbuch (last access: 24 March 2023), 2021.
Short summary
This study reveals permafrost degradation by repeating old geophysical measurements at three Alpine sites. The compared data indicate that ice-poor permafrost is highly affected by temperature warming. The melting of ice-rich permafrost could not be identified. However, complex geomorphic processes are responsible for this rather than external temperature change. We suspect permafrost degradation here as well. In addition, we introduce a new current injection method for data acquisition.
This study reveals permafrost degradation by repeating old geophysical measurements at three...
