Reconstruction of past atmospheric CH4 concentration from the firn air data at Dome Fuji (scientific note)
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 o...
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ftnipr:oai:nipr.repo.nii.ac.jp:00002470 2023-05-15T13:48:00+02:00 Reconstruction of past atmospheric CH4 concentration from the firn air data at Dome Fuji (scientific note) Satoshi Sugawara Kenji Kawamura Shuji Aoki Takakiyo Nakazawa Gen Hashida 2003-03 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2470 http://id.nii.ac.jp/1291/00002470/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2470&item_no=1&attribute_id=18&file_no=1 en eng 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 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2470 http://id.nii.ac.jp/1291/00002470/ AA00733561 Memoirs of National Institute of Polar Research. Special issue, 57, 153-160(2003-03) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2470&item_no=1&attribute_id=18&file_no=1 CH4 firn air Dome Fuji Departmental Bulletin Paper P(論文) 2003 ftnipr 2022-11-12T19:43:14Z 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. Report Antarc* Antarctic Memoirs of National Institute of Polar Research Polar Research National Institute of Polar Research Repository, Japan Antarctic Dome Fuji ENVELOPE(39.700,39.700,-77.317,-77.317) The Antarctic |
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Open Polar |
collection |
National Institute of Polar Research Repository, Japan |
op_collection_id |
ftnipr |
language |
English |
topic |
CH4 firn air Dome Fuji |
spellingShingle |
CH4 firn air Dome Fuji Satoshi Sugawara Kenji Kawamura Shuji Aoki Takakiyo Nakazawa Gen Hashida Reconstruction of past atmospheric CH4 concentration from the firn air data at Dome Fuji (scientific note) |
topic_facet |
CH4 firn air Dome Fuji |
description |
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. |
format |
Report |
author |
Satoshi Sugawara Kenji Kawamura Shuji Aoki Takakiyo Nakazawa Gen Hashida |
author_facet |
Satoshi Sugawara Kenji Kawamura Shuji Aoki Takakiyo Nakazawa Gen Hashida |
author_sort |
Satoshi Sugawara |
title |
Reconstruction of past atmospheric CH4 concentration from the firn air data at Dome Fuji (scientific note) |
title_short |
Reconstruction of past atmospheric CH4 concentration from the firn air data at Dome Fuji (scientific note) |
title_full |
Reconstruction of past atmospheric CH4 concentration from the firn air data at Dome Fuji (scientific note) |
title_fullStr |
Reconstruction of past atmospheric CH4 concentration from the firn air data at Dome Fuji (scientific note) |
title_full_unstemmed |
Reconstruction of past atmospheric CH4 concentration from the firn air data at Dome Fuji (scientific note) |
title_sort |
reconstruction of past atmospheric ch4 concentration from the firn air data at dome fuji (scientific note) |
publisher |
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 |
publishDate |
2003 |
url |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2470 http://id.nii.ac.jp/1291/00002470/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2470&item_no=1&attribute_id=18&file_no=1 |
long_lat |
ENVELOPE(39.700,39.700,-77.317,-77.317) |
geographic |
Antarctic Dome Fuji The Antarctic |
geographic_facet |
Antarctic Dome Fuji The Antarctic |
genre |
Antarc* Antarctic Memoirs of National Institute of Polar Research Polar Research |
genre_facet |
Antarc* Antarctic Memoirs of National Institute of Polar Research Polar Research |
op_relation |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2470 http://id.nii.ac.jp/1291/00002470/ AA00733561 Memoirs of National Institute of Polar Research. Special issue, 57, 153-160(2003-03) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2470&item_no=1&attribute_id=18&file_no=1 |
_version_ |
1766248370351898624 |