Journal article
Tidal and Rainfall Controls of CH4 Fluxes in a Southern Moreton Bay Mangrove‐Saltmarsh
Journal of geophysical research: Biogeosciences, Vol.131(8), pp.1-18
08/2026
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Abstract
Coastal wetlands play a crucial role in global carbon dynamics, acting as carbon dioxide (CO2) sinks while also emitting methane (CH4), a potent greenhouse gas. This study investigates CH4 fluxes over a six‐month period in a sub‐tropical coastal mangrove‐saltmarsh wetland in southern Moreton Bay, Queensland, Australia, using eddy covariance. The site functioned predominantly as a net CH4 source, with a mean (±SD) half‐hourly flux of 0.054 ± 0.943 μmol m−2 s−1 over the full six‐month period, exceeding previous mean CH4 estimates from coastal wetlands and reflecting high variability. Hydrological factors, particularly the extent and duration of tidal inundation and rainfall, strongly influenced coastal wetland CH4 dynamics. Spring tides amplified emissions by promoting waterlogged anoxic conditions ideal for methanogenesis. In contrast, rainfall events disrupted typical flux patterns, enhancing both emissions and uptake, overall leading to a net CH4 sink. Diel and seasonal variations were also evident, with elevated night‐time emissions and seasonal fluxes modulated by hydrological events. These findings underscore the importance of short‐term hydrological disturbances in shaping CH4 fluxes and highlight the need for region‐specific long‐term monitoring in coastal wetlands. As climate change intensifies precipitation, storm frequency, and associated inundation patterns, capturing these transient, high‐impact events is essential for accurate GHG accounting and climate mitigation strategies.
Details
- Title
- Tidal and Rainfall Controls of CH4 Fluxes in a Southern Moreton Bay Mangrove‐Saltmarsh
- Creators
- Eboni‐Jane Vienna-Hallam - Monash UniversityRuth Reef - Monash UniversityJudith A. Rosentreter - Southern Cross UniversityBradley D. Eyre - Southern Cross UniversityJacob Yeo - Southern Cross UniversityAdam J. Kessler - Monash UniversityTivanka Anandappa - Monash University
- Publication Details
- Journal of geophysical research: Biogeosciences, Vol.131(8), pp.1-18
- Publisher
- Wiley
- Number of pages
- 18
- Grant note
- Open access publishing facilitated by Monash University, as part of the Wiley ‐ Monash University agreement via the Council of Australasian University Librarians.
- Identifiers
- 991013396817202368
- Copyright
- © 2026 The Author(s)
- Academic Unit
- Faculty of Science and Engineering; Science
- Language
- English
- Resource Type
- Journal article