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Biogeosciences An interactive open-access journal of the European Geosciences Union
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Preprints
https://doi.org/10.5194/bg-2020-438
https://doi.org/10.5194/bg-2020-438

  06 Jan 2021

06 Jan 2021

Review status: this preprint is currently under review for the journal BG.

High-resolution induced polarization imaging of biogeochemical carbon-turnover hot spots in a peatland

Timea Katona1, Benjamin Silas Gilfedder2, Sven Frei2, Matthias Bücker3, and Adrian Flores-Orozco1 Timea Katona et al.
  • 1Research Division Geophysics, Department of Geodesy and Geoinformation, TU-Wien, Austria
  • 2Department of Hydrology, University of Bayreuth, Germany
  • 3Institute for Geophysics and Extraterrestrial Physics, TU Braunschweig, Germany

Abstract. Biogeochemical hot spots are defined as areas where biogeochemical processes occur with anomalously high reaction rates relative to their surroundings. Due to their importance in carbon and nutrient cycling, characterization of hot spots is critical to accurately predict carbon budgets in the context of climate change. However, biogeochemical hot spots are difficult to identify in the environment, as sampling resolutions are often too coarse to find these areas in the subsurface. Here, we present imaging results of a geophysical survey using the non-invasive induced polarization (IP) method to identify biogeochemical hot spots of carbon turnover in a minerotrophic wetland. To interpret the field-scale IP signatures, geochemical analyses were performed on freeze-core samples obtained in areas characterized by anomalously high and low IP responses. Our results reveal large variations in the electrical response, with the highest IP phase values (> 20 mrad) corresponding with high concentrations of phosphates (> 4000 μM), an indicator of carbon turnover. Moreover, analysis of the freeze core reveal negligible concentrations of iron sulfides. The extensive geochemical and geophysical data presented in our study demonstrates that IP images can assess changes in the biogeochemical activity in peat, and identify hot spots.

Timea Katona et al.

Status: open (until 17 Feb 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on bg-2020-438', Andre Revil, 19 Jan 2021 reply

Timea Katona et al.

Timea Katona et al.

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