Articles | Volume 22, issue 8
https://doi.org/10.5194/bg-22-2069-2025
https://doi.org/10.5194/bg-22-2069-2025
Research article
 | 
25 Apr 2025
Research article |  | 25 Apr 2025

Rising Arctic seas and thawing permafrost: uncovering the carbon cycle impact in a thermokarst lagoon system in the outer Mackenzie Delta, Canada

Maren Jenrich, Juliane Wolter, Susanne Liebner, Christian Knoblauch, Guido Grosse, Fiona Giebeler, Dustin Whalen, and Jens Strauss

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Cited articles

An, L., Yan, Y.-C., Tian, H.-L., Chi, C.-Q., Nie, Y., and Wu, X.-L.: Roles of sulfate-reducing bacteria in sustaining the diversity and stability of marine bacterial community, Front. Microbiol., 14, https://doi.org/10.3389/fmicb.2023.1218828, 2023. 
Angelopoulos, M., Overduin, P. P., Westermann, S., Tronicke, J., Strauss, J., Schirrmeister, L., Biskaborn, B. K., Liebner, S., Maksimov, G., Grigoriev, M. N., and Grosse, G.: Thermokarst Lake to Lagoon Transitions in Eastern Siberia: Do Submerged Taliks Refreeze?, J. Geophys. Res.-Earth, 125, e2019JF005424, https://doi.org/10.1029/2019JF005424, 2020. 
Angelopoulos, M., Overduin, P. P., Jenrich, M., Nitze, I., Günther, F., Strauss, J., Westermann, S., Schirrmeister, L., Kholodov, A., Krautblatter, M., Grigoriev, M. N., and Grosse, G.: Onshore Thermokarst Primes Subsea Permafrost Degradation, Geophys. Res. Lett., 48, e2021GL093881, https://doi.org/10.1029/2021GL093881, 2021. 
Balcombe, P., Speirs, J. F., Brandon, N. P., and Hawkes, A. D.: Methane emissions: choosing the right climate metric and time horizon, Environ. Sci.-Proc. Imp., 20, 1323–1339, https://doi.org/10.1039/C8EM00414E, 2018. 
Berry, H. B., Whalen, D., and Lim, M.: Long-term ice-rich permafrost coast sensitivity to air temperatures and storm influence: lessons from Pullen Island, Northwest Territories, Canada, Arctic Science, 7, 723–745, https://doi.org/10.1139/as-2020-0003, 2021. 
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Short summary
Climate warming in the Arctic is causing the erosion of permafrost coasts and the transformation of permafrost lakes into lagoons. To understand how this affects greenhouse gas (GHG) emissions, we studied carbon dioxide (CO₂) and methane (CH₄) production in lagoons with varying sea connections. Younger lagoons produce more CH₄, while CO₂ increases under more marine conditions. Flooding of permafrost lowlands due to rising sea levels may lead to higher GHG emissions from Arctic coasts in future.
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