Groundwater discharge as a driver of methane emissions from Arctic lakes

Carolina Olid (), Valentí Rodellas, Gerard Rocher-Ros, Jordi Garcia-Orellana, Marc Diego-Feliu, Aaron Alorda-Kleinglass, David Bastviken and Jan Karlsson
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Carolina Olid: Umeå University
Valentí Rodellas: Universitat Autònoma de Barcelona
Gerard Rocher-Ros: Umeå University
Jordi Garcia-Orellana: Universitat Autònoma de Barcelona
Marc Diego-Feliu: Universitat Autònoma de Barcelona
Aaron Alorda-Kleinglass: Universitat Autònoma de Barcelona
David Bastviken: Linköping University
Jan Karlsson: Umeå University

Nature Communications, 2022, vol. 13, issue 1, 1-9

Abstract: Abstract Lateral CH4 inputs to Arctic lakes through groundwater discharge could be substantial and constitute an important pathway that links CH4 production in thawing permafrost to atmospheric emissions via lakes. Yet, groundwater CH4 inputs and associated drivers are hitherto poorly constrained because their dynamics and spatial variability are largely unknown. Here, we unravel the important role and drivers of groundwater discharge for CH4 emissions from Arctic lakes. Spatial patterns across lakes suggest groundwater inflows are primarily related to lake depth and wetland cover. Groundwater CH4 inputs to lakes are higher in summer than in autumn and are influenced by hydrological (groundwater recharge) and biological drivers (CH4 production). This information on the spatial and temporal patterns on groundwater discharge at high northern latitudes is critical for predicting lake CH4 emissions in the warming Arctic, as rising temperatures, increasing precipitation, and permafrost thawing may further exacerbate groundwater CH4 inputs to lakes.

Date: 2022
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DOI: 10.1038/s41467-022-31219-1

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