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Published (Version of record)CC BY-NC V4.0, Open Access
Published (Version of record)CC BY-NC V4.0, Open
Journal article
Drivers of Seasonal and Diel Methane Emissions From a Seagrass Ecosystem
Journal of geophysical research. Biogeosciences, Vol.129(11), pp.1-16
11/2024
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Abstract
Seagrass meadows are effective sinks of atmospheric carbon dioxide (CO2). However, there is little insight on how methane (CH4) emissions may potentially offset carbon sequestration in seagrass meadows. Here, we resolve diel and seasonal dynamics of CH4 and CO2 water-air fluxes over a cold-temperate Zostera marina seagrass meadow using high-resolution timeseries observations in seawater. CH4 was emitted from the seagrass-dominated coastal bay year-round to atmosphere with CH4 fluxes ranging from 0.2 to 2.6 μmol m−2 d−1. These fluxes are at the lower end of earlier estimates based mostly on short-term (i.e., 1 day) observations. The 13-fold seasonal fluctuations in CH4 emissions were greater than the 6-fold diel fluctuation. Radon observations imply that dissolved CH4 was primarily originated from sediment porewater. The main fate of CH4 in the water was outgassing to the atmosphere via wind forcing. Oxygen and temperature partially controlled dissolved CH4 seasonal dynamics. There was an annual average uptake of CO2 from the atmosphere (−0.9 ± 1.5 mmol m−2 d−1) driven by enhanced photosynthesis in the spring and summer. The CO2-equivalent CH4 outgassing (0.5 ± 0.6 g CO2 eq m−2 yr−1) offsets only 0.8% of the sediment carbon accumulation in this cold-temperate Z. marina meadows over a 20-year time horizon. The CO2-equivalent CH4 flux was 6% of the average annual CO2 uptake. Hence, CH4 emissions from this cold-temperate seagrass meadow acted as a minor offset to carbon sequestration
Details
- Title
- Drivers of Seasonal and Diel Methane Emissions From a Seagrass Ecosystem
- Creators
- Linnea Henriksson - University of GothenburgYvonne Y. Y. Yau - University of GothenburgClaudia Majtényi-Hill - University of GothenburgWilma Ljungberg - University of GothenburgAprajita S. Tomer - University of GothenburgShibin Zhao - Ocean University of ChinaFenfang Wang - Xiamen UniversityAlex Cabral - University of GothenburgMaria Asplund - University of GothenburgIsaac R. Santos - University of Gothenburg
- Publication Details
- Journal of geophysical research. Biogeosciences, Vol.129(11), pp.1-16
- Publisher
- American Geophysical Union
- Number of pages
- 16
- Grant note
- Swedish research council; Swedish Research Council 2021-01280 / FORMAS; Swedish Research Council Formas
- Identifiers
- 991013235709202368
- Copyright
- © 2024 The Author(s). This is an open access article under the terms of the Creative Commons Attribution-NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.
- Academic Unit
- Faculty of Science and Engineering; National Marine Science Centre
- Language
- English
- Resource Type
- Journal article