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Published (Version of record)CC BY V4.0, Open Access
Published (Version of record)CC BY V4.0, Open
Journal article
High methane emissions from an anoxic fjord driven by mixing and oxygenation
Limnology and Oceanography Letters, Vol.7(5), pp.392-400
10/2022
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Abstract
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.
Details
- Title
- High methane emissions from an anoxic fjord driven by mixing and oxygenation
- Creators
- Stefano Bonaglia - University of GothenburgTobias Rütting - University of GothenburgMikhail Kononets - University of GothenburgAnders Stigebrandt - University of GothenburgIsaac R. Santos - University of GothenburgPer O. J. Hall - University of Gothenburg
- Publication Details
- Limnology and Oceanography Letters, Vol.7(5), pp.392-400
- Publisher
- John Wiley & Sons, Inc.
- Grant note
- Funding was provided by the Swedish Environmental Protection Agency(Grant Number NV 08/307 F-255-08) to AS and POJH.
- Identifiers
- 991013036321402368
- Copyright
- © 2022 The Authors. Limnology and Oceanography Letters published by Wiley Periodicals LLC on behalf of Association for the Sciences of Limnology and Oceanography. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
- Academic Unit
- Faculty of Science and Engineering; Science
- Language
- English
- Resource Type
- Journal article