Interactions between iron and carbon in permafrost thaw ponds ...

Thawing permafrost forms “thaw ponds” that accumulate and transport organic carbon (OC), redox-active iron (Fe), and other elements. Although Fe has been shown to act as a control on the microbial degradation of OC in permafrost soils, the role of iron in carbon cycling in thaw ponds remains poorly...

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Bibliographic Details
Main Authors: Chauhan, Ankita, Patzner, Monique S., Bhattacharyya, Amrita, Borch, Thomas, Fischer, Stefan, Obst, Martin, ThomasArrigo, Laurel K., Kretzschmar, Ruben, Mansor, Muammar, Bryce, Casey, Kappler, Andreas, Joshi, Prachi
Format: Article in Journal/Newspaper
Language:English
Published: ETH Zurich 2024
Subjects:
Iron‑carbon interactions
Iron speciation
Organic carbon
Thaw ponds
Permafrost soils
Abisko
permafrost
Online Access:https://dx.doi.org/10.3929/ethz-b-000681712
http://hdl.handle.net/20.500.11850/681712
Description
Summary:Thawing permafrost forms “thaw ponds” that accumulate and transport organic carbon (OC), redox-active iron (Fe), and other elements. Although Fe has been shown to act as a control on the microbial degradation of OC in permafrost soils, the role of iron in carbon cycling in thaw ponds remains poorly understood. Here, we investigated Fe-OC interactions in thaw ponds in partially and fully thawed soils (“bog” and “fen” thaw ponds, respectively) in a permafrost peatland complex in Abisko, Sweden, using size separation (large particulate fraction (LPF), small particulate fraction (SPF), and dissolved fraction (DF)), acid extractions, scanning electron microscopy (SEM), Fe K-edge X-ray absorption spectroscopy (XAS), and Fourier Transform Infrared (FTIR) spectroscopy. The bulk total Fe (total suspended Fe) in the bogs ranged from 135 mg/L (mean = 13 mg/L) whereas the fens exhibited higher total Fe (1.5 to 212 mg/L, mean = 30 mg/L). The concentration of bulk total OC (TOC) in the bog thaw ponds ranged from 50 to 352 ... : Science of The Total Environment, 946 ...

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