Item type |
紀要論文(ELS) / Departmental Bulletin Paper(1) |
公開日 |
1992-02-01 |
タイトル |
|
|
タイトル |
AIR EXTRACTION SYSTEMS FOR ICE CORE AND CO_2 AND CH_4 CONCENTRATIONS IN THE PAST ATMOSPHERE |
言語 |
|
|
言語 |
eng |
資源タイプ |
|
|
資源タイプ識別子 |
http://purl.org/coar/resource_type/c_6501 |
|
資源タイプ |
departmental bulletin paper |
ID登録 |
|
|
ID登録 |
10.15094/00003716 |
|
ID登録タイプ |
JaLC |
ページ属性 |
|
|
内容記述タイプ |
Other |
|
内容記述 |
P(論文) |
記事種別(英) |
|
|
|
en |
|
|
ABSTRACT |
論文名よみ |
|
|
その他のタイトル |
AIR EXTRACTION SYSTEMS FOR ICE CORE AND CO_2 AND CH_4 CONCENTRATIONS IN THE PAST ATMOSPHERE |
著者名よみ |
ナカザワ, タカキヨ
マチダ, トシノブ
エスミ, ケンジ
タナカ, マサユキ
フジイ, ヨシユキ
アオキ, シュンジ
ワタナベ, オキツグ
|
著者名(英) |
NAKAZAWA, Takakiyo
MACHIDA, Toshinobu
ESUMI, Kenji
TANAKA, Masayuki
FUJII, Yoshiyuki
AOKI, Shuhji
WATANABE, Okitsugu
|
著者所属(英) |
|
|
|
en |
|
|
Center for Atmospheric and Oceanic Studies, Faculty of Science, Tohoku University |
著者所属(英) |
|
|
|
en |
|
|
Center for Atmospheric and Oceanic Studies, Faculty of Science, Tohoku University |
著者所属(英) |
|
|
|
en |
|
|
Center for Atmospheric and Oceanic Studies, Faculty of Science, Tohoku University:(Present address)Japan Weather Association |
著者所属(英) |
|
|
|
en |
|
|
Center for Atmospheric and Oceanic Studies, Faculty of Science, Tohoku University |
著者所属(英) |
|
|
|
en |
|
|
National Institute of Polar Research |
著者所属(英) |
|
|
|
en |
|
|
National Institute of Polar Research |
著者所属(英) |
|
|
|
en |
|
|
National Institute of Polar Research |
抄録(英) |
|
|
内容記述タイプ |
Other |
|
内容記述 |
Dry and melt extraction systems have been developed to determine respectively the CO_2 and CH_4 concentrations of ancient air trapped in the polar ice core. The day extraction system was confirmed to be capable of crushing a core sample of 1kg to fine powder within 2 min, and its air extraction efficiency was estimated to be 98%. The air for the CH_4 measurements was extracted by melting core samples in an evacuated chamber. The CO_2 and CH_4 concentrations were determined using gas chromatography. The overall precision of our analyses is better than ±1 ppmv for CO_2 and ±10 ppbv for CH_4. Two Antarctic ice cores were used in this study. The ice core drilled at Mizuho Station (70°42'S, 44°20'E) showed that pre-industrial levels of the CO_2 and CH_4 concentrations (3300-200 yrs BP) were 279-287 ppmv and 690-750 ppbv, respectively and both concentrations increased rapidly for the last 200 years. It was also found that the CO_2 concentrations between 800 and 200 yrs BP were higher by almost 7 ppmv than those in remaining pre-industrial time, due probably to CO_2 release from the oceans and/or the biosphere. The Yamato core drilled near the end of ice flow (near the Yamato Mountains) showed concentrations of 230-240 ppmv and 530-580 ppbv for CO_2 and CH_4,respectively, which are apparently lower than post-glacial background levels, implying that the core was formed in the glacial period. |
雑誌書誌ID |
|
|
収録物識別子タイプ |
NCID |
|
収録物識別子 |
AA10756213 |
書誌情報 |
Proceedings of the NIPR Symposium on Polar Meteorology and Glaciology
巻 5,
p. 178,
発行日 1992-02
|
出版者 |
|
|
出版者 |
National Institute of Polar Research |