Episodic release of methane bubbles from peatland during spring thaw
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| Title: | Episodic release of methane bubbles from peatland during spring thaw |
|---|---|
| Authors: | Tokida, T.1,2 tokida@affrc.go.jp, Mizoguchi, M.3, Miyazaki, T.1, Kagemoto, A.4, Nagata, O.5, Hatano, R.4 |
| Source: | Chemosphere. Dec2007, Vol. 70 Issue 2, p165-171. 7p. |
| Subjects: | Methane, Emissions (Air pollution), Peatlands, Snow, Thawing, Ice, Bubbles |
| Geographic Terms: | Japan |
| Abstract: | Methane (CH4) flux into the atmosphere during spring thaw was investigated in a small ombrotrophic peatland (141°48′E, 43°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 CH4 flush (>10mgCH4 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 CH4 in the bubbles was about 20%. The abundance of the bubble-form CH4 was sufficient to explain the observed episodic CH4 release during the thaw. Results of this study show that CH4 emissions during the thaw season have great temporal variability; emission occurs as an episodic release of bubble-form CH4 stored in the frozen layer. The results also imply the possibility that gas-phase CH4 plays an important role, not only during the growing season but also in cold-season CH4 dynamics in northern peatlands. [Copyright &y& Elsevier] |
| Copyright of Chemosphere is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 27639716 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Episodic release of methane bubbles from peatland during spring thaw – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Tokida%2C+T%2E%22">Tokida, T.</searchLink><relatesTo>1,2</relatesTo><i> tokida@affrc.go.jp</i><br /><searchLink fieldCode="AR" term="%22Mizoguchi%2C+M%2E%22">Mizoguchi, M.</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Miyazaki%2C+T%2E%22">Miyazaki, T.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Kagemoto%2C+A%2E%22">Kagemoto, A.</searchLink><relatesTo>4</relatesTo><br /><searchLink fieldCode="AR" term="%22Nagata%2C+O%2E%22">Nagata, O.</searchLink><relatesTo>5</relatesTo><br /><searchLink fieldCode="AR" term="%22Hatano%2C+R%2E%22">Hatano, R.</searchLink><relatesTo>4</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Chemosphere%22">Chemosphere</searchLink>. Dec2007, Vol. 70 Issue 2, p165-171. 7p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Methane%22">Methane</searchLink><br /><searchLink fieldCode="DE" term="%22Emissions+%28Air+pollution%29%22">Emissions (Air pollution)</searchLink><br /><searchLink fieldCode="DE" term="%22Peatlands%22">Peatlands</searchLink><br /><searchLink fieldCode="DE" term="%22Snow%22">Snow</searchLink><br /><searchLink fieldCode="DE" term="%22Thawing%22">Thawing</searchLink><br /><searchLink fieldCode="DE" term="%22Ice%22">Ice</searchLink><br /><searchLink fieldCode="DE" term="%22Bubbles%22">Bubbles</searchLink> – Name: SubjectGeographic Label: Geographic Terms Group: Su Data: <searchLink fieldCode="DE" term="%22Japan%22">Japan</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Methane (CH4) flux into the atmosphere during spring thaw was investigated in a small ombrotrophic peatland (141°48′E, 43°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 CH4 flush (>10mgCH4 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 CH4 in the bubbles was about 20%. The abundance of the bubble-form CH4 was sufficient to explain the observed episodic CH4 release during the thaw. Results of this study show that CH4 emissions during the thaw season have great temporal variability; emission occurs as an episodic release of bubble-form CH4 stored in the frozen layer. The results also imply the possibility that gas-phase CH4 plays an important role, not only during the growing season but also in cold-season CH4 dynamics in northern peatlands. [Copyright &y& Elsevier] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Chemosphere is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/j.chemosphere.2007.06.042 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 7 StartPage: 165 Subjects: – SubjectFull: Methane Type: general – SubjectFull: Emissions (Air pollution) Type: general – SubjectFull: Peatlands Type: general – SubjectFull: Snow Type: general – SubjectFull: Thawing Type: general – SubjectFull: Ice Type: general – SubjectFull: Bubbles Type: general – SubjectFull: Japan Type: general Titles: – TitleFull: Episodic release of methane bubbles from peatland during spring thaw Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Tokida, T. – PersonEntity: Name: NameFull: Mizoguchi, M. – PersonEntity: Name: NameFull: Miyazaki, T. – PersonEntity: Name: NameFull: Kagemoto, A. – PersonEntity: Name: NameFull: Nagata, O. – PersonEntity: Name: NameFull: Hatano, R. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 12 Text: Dec2007 Type: published Y: 2007 Identifiers: – Type: issn-print Value: 00456535 Numbering: – Type: volume Value: 70 – Type: issue Value: 2 Titles: – TitleFull: Chemosphere Type: main |
| ResultId | 1 |
