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Ultrahigh resolution dissolved organic matter characterization reveals distinct permafrost characteristics on the Peel Plateau, Canada

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A Correction to this article was published on 13 January 2024

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Abstract

The Arctic is warming at a rate twice that of other global ecosystems and changing climate conditions in the Arctic are mobilizing long frozen permafrost stores of organic carbon. In ice-rich regions, permafrost thaw on sloping terrain can cause land subsidence, and the development of thaw-driven mass wasting. The Peel Plateau, Northwest Territories, Canada has extensive thaw-driven landslides called retrogressive thaw slumps that are exposing early Holocene age paleo-thaw layers and Pleistocene age glaciogenic material deposited by the Laurentide Ice Sheet. This study aimed to see if unique retrogressive thaw slump derived permafrost inputs could be readily observed in streams across six diverse thermokarst features via optical and ultrahigh-resolution mass spectrometry. Aquatic samples from water draining thermokarst slump features, and downstream of thermokarst inputs exhibited higher dissolved organic carbon concentrations and lower aromaticity as evidenced by optical parameters (e.g. declining SUVA254, increasing S275-295) and FT-ICR MS metrics (e.g. lower AImod and nominal oxidation state of carbon) versus upstream of thermokarst impacts. Increases in the relative abundances of assigned heteroatomic molecular formulae (e.g. CHON, CHOS, CHONS) were also greater within and downstream of thermokarst features. The unique molecular formulae present in permafrost thermokarst inputs were determined (n = 1844) and subsequently tracked downstream. These permafrost marker formulae were enriched in aliphatics and H/C, as well as heteroatoms and exhibited low aromaticity. A portion of the unique molecular fingerprint persisted downstream, highlighting the potential to not only assess thermokarst inputs but also to follow these inputs and their fate downstream throughout the aquatic network.

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Data availability

All molecular formulae documented by the FT-ICR MS are available in the OSF database at https://osf.io/4kvys/ with the title: P19786_Tracing Permafrost Thaw DOM on the Peel Plateau, Canada.

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Acknowledgements

Thank you to all funding partners including Polar Continental Shelf Program grant number 657-21 for helicopter support, and NSERC (Natural Sciences and Engineering Council of Canada; grants RGPIN-2019-05524 and RGPNS-2019-444873), UAlberta North, POLAR Canada (Northern Scientific Training Program), and ArcticNet Canada (grant P13). Thank you to all of the field support during sample collection including A. Koe, and the Tetlit Gwich'in Renewable Resource Council in Fort McPherson. A portion of this work was conducted at the National High Magnetic Field Laboratory ICR User Facility, which is funded by the National Science Foundation Division of Chemistry through DMR-1644779 and the State of Florida. The authors thank all the helpful researchers at the NHMFL, ICR Program who enabled data acquisition and processing. Thank you to Dr. Jacob Carstens for assistance in creating Figures 2, 3, 4 and 5. The authors appreciate the guidance from our lab group members Amy Holt and Sommer Starr during data processing.

Funding

Polar Continental Shelf Program grant number 657-21 for helicopter support, and NSERC (Natural Sciences and Engineering Council of Canada; grants RGPIN-2019-05524 and RGPNS-2019-444873), UAlberta North, POLAR Canada (Northern Scientific Training Program), and ArcticNet Canada (grant P13). A portion of this work was conducted at the National High Magnetic Field Laboratory ICR User Facility, which is funded by the National Science Foundation Division of Chemistry through DMR-1644779 and the State of Florida.

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Correspondence to M. R. N. Moore.

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Responsible Editor: Jack Brookshire.

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The original online version of this paper was updated. The name from the second to last author was misspelled Koklej. The correct spelling is: Kokelj.

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10533_2023_1101_MOESM1_ESM.xlsx

Supplementary file1 List of all formula present, and their formula class, for each group of sample types: upstream common, within-slump common, within-slump unique, and within-slump unique in downstream (XLSX 319 KB)

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Moore, M.R.N., Tank, S.E., Kurek, M.R. et al. Ultrahigh resolution dissolved organic matter characterization reveals distinct permafrost characteristics on the Peel Plateau, Canada. Biogeochemistry 167, 99–117 (2024). https://doi.org/10.1007/s10533-023-01101-3

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  • DOI: https://doi.org/10.1007/s10533-023-01101-3

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