Distribution of dissolved methane and nitrous oxide in Chilean coastal systems of the Magellanic Sub-Antarctic region (50°–55°S)

Oceanic methane (CH4) budgets lack data from high‐latitude fjords that often behave as intermittently anoxic ecosystems with potentially high methane emissions. We conducted 15 expeditions and 49 in situ lander deployments in an anoxic Scandinavian fjord between 2009 and 2021. Benthic fluxes were highest at the deepest anoxic site (average 516 μmol CH4 m−2 d−1), supporting bottom water methane exceeding 5000 nM. Natural and engineered mixing events displaced methane‐rich bottom waters, enhancing upper water concentrations and driving high sea–air flux reaching 641 μmol CH4 m−2 d−1. Mixing also reduced pelagic methane oxidation from 70% to 20% of all methane sources into the fjord. Upscaling of literature fluxes combined with our results suggests that fjords globally emit 1.0 ± 0.8 Tg CH4 yr−1. Despite their small global area, fjords are hotspots of methane release. We suggest that ongoing deoxygenation and global change will enhance methane emissions from fjords.

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High methane emissions from an anoxic fjord driven by mixing and oxygenation

Bonaglia

Rütting

Kononets

et al. 2022

Limnol Oceanogr Letters

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Temporal methane variability in the water column of an area of seasonal coastal upwelling: A study based on a 12 year time series

Tenorio

Sanzana

Faúndez

2021

Progress in Oceanography

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Carbon stocks and greenhouse gas emissions (CH4 and N2O) in mangroves with different vegetation assemblies in the central coastal plain of Veracruz Mexico

Hernández

Junca-Gómez

2020

Science of The Total Environment

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Distribution of dissolved methane and nitrous oxide in Chilean coastal systems of the Magellanic Sub-Antarctic region (50°–55°S)

Cited by 5 publications

References 64 publications

High methane emissions from an anoxic fjord driven by mixing and oxygenation

High methane emissions from an anoxic fjord driven by mixing and oxygenation

Temporal methane variability in the water column of an area of seasonal coastal upwelling: A study based on a 12 year time series

Carbon stocks and greenhouse gas emissions (CH4 and N2O) in mangroves with different vegetation assemblies in the central coastal plain of Veracruz Mexico

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