New technique for high-precision, simultaneous measurements of CH 4 , N 2 O and CO 2 concentrations; isotopic and elemental ratios of N 2 , O 2 and Ar; and total air content in ice cores by wet extraction
Air in polar ice cores provides unique information on past climatic and atmospheric changes. We developed a new method combining wet extraction, gas chromatography and mass spectrometry for high-precision, simultaneous measurements of eight air components ( CH 4 , N 2 O and CO 2 concentrations; δ 15...
Published in: | Atmospheric Measurement Techniques |
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Online Access: | https://doi.org/10.5194/amt-13-6703-2020 https://doaj.org/article/1245e4bff01c47058f49d1749e5ad518 |
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ftdoajarticles:oai:doaj.org/article:1245e4bff01c47058f49d1749e5ad518 2023-05-15T16:38:53+02:00 New technique for high-precision, simultaneous measurements of CH 4 , N 2 O and CO 2 concentrations; isotopic and elemental ratios of N 2 , O 2 and Ar; and total air content in ice cores by wet extraction I. Oyabu K. Kawamura K. Kitamura R. Dallmayr A. Kitamura C. Sawada J. P. Severinghaus R. Beaudette A. Orsi S. Sugawara S. Ishidoya D. Dahl-Jensen K. Goto-Azuma S. Aoki T. Nakazawa 2020-12-01T00:00:00Z https://doi.org/10.5194/amt-13-6703-2020 https://doaj.org/article/1245e4bff01c47058f49d1749e5ad518 EN eng Copernicus Publications https://amt.copernicus.org/articles/13/6703/2020/amt-13-6703-2020.pdf https://doaj.org/toc/1867-1381 https://doaj.org/toc/1867-8548 doi:10.5194/amt-13-6703-2020 1867-1381 1867-8548 https://doaj.org/article/1245e4bff01c47058f49d1749e5ad518 Atmospheric Measurement Techniques, Vol 13, Pp 6703-6731 (2020) Environmental engineering TA170-171 Earthwork. Foundations TA715-787 article 2020 ftdoajarticles https://doi.org/10.5194/amt-13-6703-2020 2022-12-31T09:48:54Z Air in polar ice cores provides unique information on past climatic and atmospheric changes. We developed a new method combining wet extraction, gas chromatography and mass spectrometry for high-precision, simultaneous measurements of eight air components ( CH 4 , N 2 O and CO 2 concentrations; δ 15 N , δ 18 O , δ O 2 ∕N 2 and δ Ar∕N 2 and total air content) from an ice-core sample of ∼ 60 g . The ice sample is evacuated for ∼ 2 h and melted under vacuum, and the released air is continuously transferred into a sample tube at 10 K within 10 min . The air is homogenized in the sample tube overnight at room temperature and split into two aliquots for mass spectrometric and gas chromatographic measurements. Care is taken to minimize (1) contamination of greenhouse gases by using a long evacuation time, (2) consumption of oxygen during sample storage by a passivation treatment on sample tubes, and (3) fractionation of isotopic ratios with a long homogenization time for splitting. Precision is assessed by analyzing standard gases with artificial ice and duplicate measurements of the Dome Fuji and NEEM ice cores. The overall reproducibility (1 SD) of duplicate ice-core analyses are 3.2 ppb , 2.2 ppb and 2.9 ppm for CH 4 , N 2 O and CO 2 concentrations; 0.006 ‰, 0.011 ‰, 0.09 ‰ and 0.12 ‰ for δ 15 N , δ 18 O , δ O 2 ∕N 2 and δ Ar∕N 2 and 0.63 mL STP kg −1 for total air content, respectively. Our new method successfully combines the high-precision, small-sample and multiple-species measurements, with a wide range of applications for ice-core paleoenvironmental studies. Article in Journal/Newspaper ice core Directory of Open Access Journals: DOAJ Articles Dome Fuji ENVELOPE(39.700,39.700,-77.317,-77.317) Atmospheric Measurement Techniques 13 12 6703 6731 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental engineering TA170-171 Earthwork. Foundations TA715-787 |
spellingShingle |
Environmental engineering TA170-171 Earthwork. Foundations TA715-787 I. Oyabu K. Kawamura K. Kitamura R. Dallmayr A. Kitamura C. Sawada J. P. Severinghaus R. Beaudette A. Orsi S. Sugawara S. Ishidoya D. Dahl-Jensen K. Goto-Azuma S. Aoki T. Nakazawa New technique for high-precision, simultaneous measurements of CH 4 , N 2 O and CO 2 concentrations; isotopic and elemental ratios of N 2 , O 2 and Ar; and total air content in ice cores by wet extraction |
topic_facet |
Environmental engineering TA170-171 Earthwork. Foundations TA715-787 |
description |
Air in polar ice cores provides unique information on past climatic and atmospheric changes. We developed a new method combining wet extraction, gas chromatography and mass spectrometry for high-precision, simultaneous measurements of eight air components ( CH 4 , N 2 O and CO 2 concentrations; δ 15 N , δ 18 O , δ O 2 ∕N 2 and δ Ar∕N 2 and total air content) from an ice-core sample of ∼ 60 g . The ice sample is evacuated for ∼ 2 h and melted under vacuum, and the released air is continuously transferred into a sample tube at 10 K within 10 min . The air is homogenized in the sample tube overnight at room temperature and split into two aliquots for mass spectrometric and gas chromatographic measurements. Care is taken to minimize (1) contamination of greenhouse gases by using a long evacuation time, (2) consumption of oxygen during sample storage by a passivation treatment on sample tubes, and (3) fractionation of isotopic ratios with a long homogenization time for splitting. Precision is assessed by analyzing standard gases with artificial ice and duplicate measurements of the Dome Fuji and NEEM ice cores. The overall reproducibility (1 SD) of duplicate ice-core analyses are 3.2 ppb , 2.2 ppb and 2.9 ppm for CH 4 , N 2 O and CO 2 concentrations; 0.006 ‰, 0.011 ‰, 0.09 ‰ and 0.12 ‰ for δ 15 N , δ 18 O , δ O 2 ∕N 2 and δ Ar∕N 2 and 0.63 mL STP kg −1 for total air content, respectively. Our new method successfully combines the high-precision, small-sample and multiple-species measurements, with a wide range of applications for ice-core paleoenvironmental studies. |
format |
Article in Journal/Newspaper |
author |
I. Oyabu K. Kawamura K. Kitamura R. Dallmayr A. Kitamura C. Sawada J. P. Severinghaus R. Beaudette A. Orsi S. Sugawara S. Ishidoya D. Dahl-Jensen K. Goto-Azuma S. Aoki T. Nakazawa |
author_facet |
I. Oyabu K. Kawamura K. Kitamura R. Dallmayr A. Kitamura C. Sawada J. P. Severinghaus R. Beaudette A. Orsi S. Sugawara S. Ishidoya D. Dahl-Jensen K. Goto-Azuma S. Aoki T. Nakazawa |
author_sort |
I. Oyabu |
title |
New technique for high-precision, simultaneous measurements of CH 4 , N 2 O and CO 2 concentrations; isotopic and elemental ratios of N 2 , O 2 and Ar; and total air content in ice cores by wet extraction |
title_short |
New technique for high-precision, simultaneous measurements of CH 4 , N 2 O and CO 2 concentrations; isotopic and elemental ratios of N 2 , O 2 and Ar; and total air content in ice cores by wet extraction |
title_full |
New technique for high-precision, simultaneous measurements of CH 4 , N 2 O and CO 2 concentrations; isotopic and elemental ratios of N 2 , O 2 and Ar; and total air content in ice cores by wet extraction |
title_fullStr |
New technique for high-precision, simultaneous measurements of CH 4 , N 2 O and CO 2 concentrations; isotopic and elemental ratios of N 2 , O 2 and Ar; and total air content in ice cores by wet extraction |
title_full_unstemmed |
New technique for high-precision, simultaneous measurements of CH 4 , N 2 O and CO 2 concentrations; isotopic and elemental ratios of N 2 , O 2 and Ar; and total air content in ice cores by wet extraction |
title_sort |
new technique for high-precision, simultaneous measurements of ch 4 , n 2 o and co 2 concentrations; isotopic and elemental ratios of n 2 , o 2 and ar; and total air content in ice cores by wet extraction |
publisher |
Copernicus Publications |
publishDate |
2020 |
url |
https://doi.org/10.5194/amt-13-6703-2020 https://doaj.org/article/1245e4bff01c47058f49d1749e5ad518 |
long_lat |
ENVELOPE(39.700,39.700,-77.317,-77.317) |
geographic |
Dome Fuji |
geographic_facet |
Dome Fuji |
genre |
ice core |
genre_facet |
ice core |
op_source |
Atmospheric Measurement Techniques, Vol 13, Pp 6703-6731 (2020) |
op_relation |
https://amt.copernicus.org/articles/13/6703/2020/amt-13-6703-2020.pdf https://doaj.org/toc/1867-1381 https://doaj.org/toc/1867-8548 doi:10.5194/amt-13-6703-2020 1867-1381 1867-8548 https://doaj.org/article/1245e4bff01c47058f49d1749e5ad518 |
op_doi |
https://doi.org/10.5194/amt-13-6703-2020 |
container_title |
Atmospheric Measurement Techniques |
container_volume |
13 |
container_issue |
12 |
container_start_page |
6703 |
op_container_end_page |
6731 |
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1766029236874772480 |