Biogeosciences
Biogeosciences
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Articles | Volume 23, issue 16
Articles | Volume 23, issue 16
https://doi.org/10.5194/bg-23-5901-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-23-5901-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 23, issue 16
Research article
 | 
26 Aug 2026
Research article |  | 26 Aug 2026

Qualitative transformations of dissolved organic matter along supra-permafrost flow: insights from Arctic subterranean estuaries

Aude Flamand, Jean-François Lapierre, and Gwénaëlle Chaillou
Publisher's note: On 31 August 2026, Figure 4 was corrected because it had been inadvertently published as a duplicate of Figure 6.

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Short summary

Climate change is accelerating permafrost thaw and coastal erosion, increasing dissolved organic matter (DOM) inputs to the Arctic Ocean. We show that, beyond seawater dilution, DOM is transformed as it passes through Arctic beach subterranean estuaries, shifting from humic-rich to more microbially processed material. These coastal zones act as biogeochemical reactors, modifying DOM before its export to coastal waters.

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