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Visualizing Methane-Cycling Microbial Dynamics in Coastal Wetlands
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Episodic release of methane bubbles from peatland during spring thaw
T Tokida1, M Mizoguchi, T Miyazaki
1Department of Biological and Environmental Engineering, Graduate School of Agricultural and Life Sciences, University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo, Japan. tokida@affrc.go.jp
Chemosphere
|August 7, 2007
Summary
Methane (CH(4)) emissions from peatlands are minimal during snow cover but surge upon thawing. This study found trapped gas bubbles in ice released significant methane during spring thaw, highlighting seasonal CH(4) dynamics.
Area of Science:
- Environmental Science
- Geochemistry
- Atmospheric Science
Background:
- Peatlands are significant methane (CH(4)) sources.
- Understanding seasonal CH(4) flux is crucial for climate modeling.
- Spring thaw dynamics in peatlands remain understudied.
Purpose of the Study:
- Investigate CH(4) flux during spring thaw in a Japanese ombrotrophic peatland.
- Quantify CH(4) release associated with ice and snow melt.
- Identify the mechanism of CH(4) release during thaw.
Main Methods:
- Conventional chamber method for CH(4) flux measurement.
- Over 165 hours of continuous monitoring during spring thaw.
- Analysis of gas bubbles trapped within the ice layer.
Main Results:
- Methane emissions were negligible under snow cover.
- A significant CH(4) flush occurred immediately after ice thaw (>10mgCH(4)m(-2)h(-1)).
- Trapped bubbles contained approximately 20% CH(4) and occupied 3.2% of ice volume, explaining the observed release.
Conclusions:
- CH(4) emissions during thaw are highly variable and episodic.
- Release of bubble-form CH(4) stored in frozen layers drives thaw emissions.
- Gas-phase CH(4) plays a critical role in cold-season peatland CH(4) dynamics.
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