Item type |
紀要論文(ELS) / Departmental Bulletin Paper(1) |
公開日 |
2003-03-01 |
タイトル |
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言語 |
en |
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タイトル |
Reconstruction of past atmospheric CH4 concentration from the firn air data at Dome Fuji (scientific note) |
言語 |
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言語 |
eng |
キーワード |
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主題Scheme |
Other |
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主題 |
CH4 |
キーワード |
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主題Scheme |
Other |
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主題 |
firn air |
キーワード |
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主題Scheme |
Other |
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主題 |
Dome Fuji |
資源タイプ |
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資源タイプ識別子 |
http://purl.org/coar/resource_type/c_6501 |
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資源タイプ |
departmental bulletin paper |
ページ属性 |
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内容記述タイプ |
Other |
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内容記述 |
P(論文) |
著者名(英) |
Sugawara, Satoshi
Kawamura, Kenji
Aoki, Shuji
Nakazawa, Takakiyo
Hashida, Gen
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著者所属(英) |
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en |
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Institute of Earth Science, Miyagi University of Education/Center for Atmospheric and Oceanic Studies, Tohoku University/Center for Atmospheric and Oceanic Studies, Tohoku University/Center for Atmospheric and Oceanic Studies, Tohoku University/National Institute of Polar Research |
抄録(英) |
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内容記述タイプ |
Other |
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内容記述 |
Air samples were collected from different depths of the firn layer at Dome Fuji in December 1998 and analyzed for CH4 concentrations. The age distribution of CH4 in the firn was calculated by using a one-dimensional numerical model, and then the inverse method was applied to reconstruct variations of atmospheric CH4 in the past. The age distribution function was calculated by including processes of molecular diffusion, downward air advection and bubble trapping in the snow-ice transition zone. Once the age distribution function is calculated, the vertical distribution of CH4 in the firn layer can be reconstructed by a linear combination of the age distribution functions weighted by the atmospheric CH4 concentrations in the past. Therefore, the most plausible past atmospheric record of CH4 can be derived iteratively so that its observed profile in the firn layer was reproduced well. In order to check the calculation scheme, the estimated variation of atmospheric CH4 was compared with direct measurements in the Antarctic region. They were in good agreement with each other, even for rapid slowing down of the secular increase observed in the 1990's. |
雑誌書誌ID |
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収録物識別子タイプ |
NCID |
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収録物識別子 |
AA00733561 |
書誌情報 |
Memoirs of National Institute of Polar Research. Special issue
巻 57,
p. 153-160,
発行日 2003-03
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