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The Cryosphere An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/tc-2018-288
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/tc-2018-288
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 30 Jan 2019

Research article | 30 Jan 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal The Cryosphere (TC).

Two-dimensional Inversion of wideband spectral data from the Capacitively Coupled Resistivity method – First Applications in periglacial environments

Jan Mudler1, Andreas Hördt1, Anita Przyklenk1, Gianluca Fiandaca2, Pradip Kumar Maurya2, and Christian Hauck3 Jan Mudler et al.
  • 1Technische Universität Braunschweig, Institut für Geophysik und extraterrestrische Physik, Braunschweig, Germany
  • 2Aarhus University, Department of Geoscience, Hydrogeophysics Group, Aarhus, Denmark
  • 3University of Fribourg, Department of Geosciences, Fribourg, Switzerland

Abstract. The Capacitively Coupled Resistivity (CCR) method determines the electrical resistivity and permittivity by analysing the spectra of magnitude and phase shift of the electrical impedance. The CCR is well suited for the application in cryospheric and periglacial areas, because these areas provide the required physical conditions and logistical advantages of the method regarding the problems of coupling on highly resistive grounds and in some cases hard surfaces. Since the electrical properties of ice and frozen material have a strong frequency dependence, broad spectral measurements can deliver complementary information compared to conventional low-frequency techniques. For the inversion of the data, we modified an existing 2-D inversion code originally developed for low-frequency Induced Polarization data by including a Cole-Cole parametrization of electrical permittivity. We discuss the application of the code and particular aspects related to capacitively coupled measurements using data from two sites with cryospheric influence: the Schilthorn massif in the Swiss Alps and the frozen lake Prestvannet in the northern part of Norway. We investigate the effect of capacitive sensor height above the surface and corroborate the assumption that it is negligible for highly resistive conditions. The first results agree reasonably well with known subsurface structure and measurements reported in the literature. We conclude that a spectral 2-D inversion with a Cole-Cole parametrization of permittivity is a feasible tool to invert CCR data in periglacial environments.

Jan Mudler et al.
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Short summary
The Capacitively Coupled Resistivity method (CCR) enables the determination of frequency dependent electrical parameters of the subsurface. CCR is well suited for the application in cryospheric areas because it provides logistical advantages regarding the coupling on hard surfaces and highly resistive grounds. With our new spectral two-dimensional inversion, we can identify subsurface structures based on full spectral information. We show first results of the Inversion method on the field scale.
The Capacitively Coupled Resistivity method (CCR) enables the determination of frequency...
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