Measurements of CO2 and CH4 concentrations in air in a polar ice core
Abstract Dry and wet air-extraction systems and precise analysis systems of the CO 2 and CH 4 concentrations for a polar ice core were developed to reconstruct their ancient levels. A dry-extraction system was capable of crushing an ice sample of 1000 g into fine powder within 2 min, and its air-ext...
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Cambridge University Press (CUP)
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crcambridgeupr:10.1017/s0022143000015860 2024-05-19T07:32:24+00:00 Measurements of CO2 and CH4 concentrations in air in a polar ice core Nakazawa, Takakiyo Machida, Toshinobu Esumi, Kenji Tanaka, Masayuki Fujii, Yoshiyuki Aoki, Shuhji Watanabe, Okitsugu 1993 http://dx.doi.org/10.1017/s0022143000015860 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000015860 en eng Cambridge University Press (CUP) Journal of Glaciology volume 39, issue 132, page 209-215 ISSN 0022-1430 1727-5652 journal-article 1993 crcambridgeupr https://doi.org/10.1017/s0022143000015860 2024-05-02T06:51:17Z Abstract Dry and wet air-extraction systems and precise analysis systems of the CO 2 and CH 4 concentrations for a polar ice core were developed to reconstruct their ancient levels. A dry-extraction system was capable of crushing an ice sample of 1000 g into fine powder within 2 min, and its air-extraction efficiency was found to be 98%. The CO 2 and CH 4 concentrations of extracted air were determined using gas chromatography with a flame-ionized detector. The overall precision of our measurements, including air extraction, was estimated to be better than ± 1 ppmv for CO 2 and + 10 ppbv for CH 4 . Preliminary analysis of the ice core drilled at Mizuho Station, Antarctica, showed that the CO 2 and CH 4 concentrations at 3340–3700 year BP were about 280 ppmv and 700ppbv, respectively. The Yamato core drilled at the terminus of the glacial flow near the Yamato Mountains, Antarctica, yielded concentrations of 230–240 ppmv for CO 2 and 520–550 ppbv for CH 4 , suggesting that the core had formed during the glacial period. Article in Journal/Newspaper Antarc* Antarctica ice core Journal of Glaciology Cambridge University Press Journal of Glaciology 39 132 209 215 |
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Open Polar |
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Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
description |
Abstract Dry and wet air-extraction systems and precise analysis systems of the CO 2 and CH 4 concentrations for a polar ice core were developed to reconstruct their ancient levels. A dry-extraction system was capable of crushing an ice sample of 1000 g into fine powder within 2 min, and its air-extraction efficiency was found to be 98%. The CO 2 and CH 4 concentrations of extracted air were determined using gas chromatography with a flame-ionized detector. The overall precision of our measurements, including air extraction, was estimated to be better than ± 1 ppmv for CO 2 and + 10 ppbv for CH 4 . Preliminary analysis of the ice core drilled at Mizuho Station, Antarctica, showed that the CO 2 and CH 4 concentrations at 3340–3700 year BP were about 280 ppmv and 700ppbv, respectively. The Yamato core drilled at the terminus of the glacial flow near the Yamato Mountains, Antarctica, yielded concentrations of 230–240 ppmv for CO 2 and 520–550 ppbv for CH 4 , suggesting that the core had formed during the glacial period. |
format |
Article in Journal/Newspaper |
author |
Nakazawa, Takakiyo Machida, Toshinobu Esumi, Kenji Tanaka, Masayuki Fujii, Yoshiyuki Aoki, Shuhji Watanabe, Okitsugu |
spellingShingle |
Nakazawa, Takakiyo Machida, Toshinobu Esumi, Kenji Tanaka, Masayuki Fujii, Yoshiyuki Aoki, Shuhji Watanabe, Okitsugu Measurements of CO2 and CH4 concentrations in air in a polar ice core |
author_facet |
Nakazawa, Takakiyo Machida, Toshinobu Esumi, Kenji Tanaka, Masayuki Fujii, Yoshiyuki Aoki, Shuhji Watanabe, Okitsugu |
author_sort |
Nakazawa, Takakiyo |
title |
Measurements of CO2 and CH4 concentrations in air in a polar ice core |
title_short |
Measurements of CO2 and CH4 concentrations in air in a polar ice core |
title_full |
Measurements of CO2 and CH4 concentrations in air in a polar ice core |
title_fullStr |
Measurements of CO2 and CH4 concentrations in air in a polar ice core |
title_full_unstemmed |
Measurements of CO2 and CH4 concentrations in air in a polar ice core |
title_sort |
measurements of co2 and ch4 concentrations in air in a polar ice core |
publisher |
Cambridge University Press (CUP) |
publishDate |
1993 |
url |
http://dx.doi.org/10.1017/s0022143000015860 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000015860 |
genre |
Antarc* Antarctica ice core Journal of Glaciology |
genre_facet |
Antarc* Antarctica ice core Journal of Glaciology |
op_source |
Journal of Glaciology volume 39, issue 132, page 209-215 ISSN 0022-1430 1727-5652 |
op_doi |
https://doi.org/10.1017/s0022143000015860 |
container_title |
Journal of Glaciology |
container_volume |
39 |
container_issue |
132 |
container_start_page |
209 |
op_container_end_page |
215 |
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1799470447844130816 |