Episodic release of methane bubbles from peatland during spring thaw.

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Episodic release of methane bubbles from peatland during spring thaw. Abstract Text:

T Tokida,M Mizoguchi,T Miyazaki,A Kagemoto,O Nagata,R Hatano,T Tokida,M Mizoguchi,T Miyazaki,A Kagemoto,O Nagata,R Hatano,

Methane (CH(4)) flux into the atmosphere during spring thaw was investigated in a small ombrotrophic peatland (141 degrees 48'E, 43 degrees 19'N, Japan) using the conventional chamber method. More than 50 chamber deployments on top of the snow cover were carried out and continued for more than 165h until the surface snow and underlying ice cover on top of the peat layer had thawed completely. Methane emissions were almost absent in the presence of snow cover. At the very moment the surface ice cover thawed, a large CH(4) flush (>10mgCH(4)m(-2)h(-1)) was recorded, which was on the same order of magnitude as episodic ebullition previously observed in the high-summer. Gas bubbles trapped in the ice layer on top of the waterlogged peat were preliminarily analyzed for the volumetric percentage in the total ice volume and their gas species compositions. Results showed that the bubbles occupied about 3.2% volume and that the mixing ratio of CH(4) in the bubbles was about 20%. The abundance of the bubble-form CH(4) was sufficient to explain the observed episodic CH(4) release during the thaw. Results of this study show that CH(4) emissions during the thaw season have great temporal variability; emission occurs as an episodic release of bubble-form CH(4) stored in the frozen layer. The results also imply the possibility that gas-phase CH(4) plays an important role, not only during the growing season but also in cold-season CH(4) dynamics in northern peatlands.

Episodic release of methane bubbles from peatland during spring thaw. Publishing Authors By Initials

T Tokida,M Mizoguchi,T Miyazaki,A Kagemoto,O Nagata,R Hatano,T Tokida,M Mizoguchi,T Miyazaki,A Kagemoto,O Nagata,R Hatano,

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Episodic release of methane bubbles from peatland during spring thaw. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Chemosphere

VOLUME: 70

Page Numbers: 165-71

Journal Abbreviation: Chemosphere

ISSN: 0045-6535

DAY: 1

MONTH: 08

YEAR: 2007

Episodic release of methane bubbles from peatland during spring thaw. Information

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LANGUAGE: eng

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Grant and Affiliation Information for Episodic release of methane bubbles from peatland during spring thaw.

AFFILIATION: Department of Biological and Environmental Engineering, Graduate School of Agricultural and Life Sciences, University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo, Japan; Japan Society for the Promotion of Science, Japan.

Country: England

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MEDLINETA: Chemosphere

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