Journal cover Journal topic
Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
Journal topic

Journal metrics

IF value: 3.668
IF3.668
IF 5-year value: 3.707
IF 5-year
3.707
CiteScore value: 6.3
CiteScore
6.3
SNIP value: 1.383
SNIP1.383
IPP value: 3.75
IPP3.75
SJR value: 1.525
SJR1.525
Scimago H <br class='widget-line-break'>index value: 77
Scimago H
index
77
h5-index value: 49
h5-index49
Preprints
https://doi.org/10.5194/amt-2020-171
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-2020-171
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  09 Jun 2020

09 Jun 2020

Review status
This preprint is currently under review for the journal AMT.

New technique for high-precision, simultaneous measurements of CH4, N2O and CO2 concentrations, isotopic and elemental ratios of N2, O2 and Ar, and total air content in ice cores by wet extraction

Ikumi Oyabu1, Kenji Kawamura1,2,3, Kyotaro Kitamura1, Remi Dallmayr4, Akihiro Kitamura5, Chikako Sawada6, Jeffrey P. Severinghaus7, Ross Beaudette7, Satoshi Sugawara8, Shigeyuki Ishidoya9, Dorthe Dahl-Jensen10,11, Kumiko Goto-Azuma1,2, Shuji Aoki12, and Takakiyo Nakazawa12 Ikumi Oyabu et al.
  • 1National Institute of Polar Research, Tokyo 190-8518, Japan
  • 2Department of Polar Science, The Graduate University of Advanced Studies (SOKENDAI), Tokyo 190-8518, Japan
  • 3Japan Agency for Marine Science and Technology (JAMSTEC), Yokosuka 237-0061, Japan
  • 4Alfred Wegener Institute, Am Alten Hafen 26, Bremerhaven 27568, Germany
  • 5Labosoltech LLC, Tokyo 190-0003, Japan
  • 6Atmosphere and Ocean Research Institute, University of Tokyo, Tokyo 277-0882, Japan
  • 7Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA 92093, USA
  • 8Miyagi University of Education, Sendai 980-0845, Japan
  • 9National Institute of Advanced Industrial and Technology (AIST), Tsukuba 305-8569, Japan
  • 10University of Copenhagen, Tagensvej 16, Copenhagen 2100, Denmark
  • 11University of Manitoba,66 Chancellors Circle, Winnipeg, Manitoba, R3T 2N2, Canada
  • 12Tohoku University, Sendai 980-8577, Japan

Abstract. Air in polar ice cores provides various 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 (CH4, N2O and CO2 concentrations, δ15N, δ18O, δO2/N2, δAr/N2 and total air content) from an ice core sample of ~60 g. The ice sample is evacuated for ~2 hours and melted under vacuum, and the released air is continuously transferred into a sample tube at 10 K within 10 minutes. The air is homogenized in the sample tube overnight at room temperature, and split into two aliquots for mass spectrometric and gas chromatographic measurements. Cares are taken to minimize contamination of greenhouse gases with long evacuation time, consumption of oxygen during sample storage by passivation treatment on sample tubes, and fractionation of isotopic ratios with long homogenization time for splitting. Precisions are assessed by analysing standard gases with artificial ice, and by duplicate measurements of the Dome Fuji and NEEM ice cores. The overall reproducibility (one standard deviation) from duplicate ice-core analyses are 3.2 ppb, 2.2 ppb and 3.1 ppm for CH4, N2O and CO2 concentrations, 0.006, 0.010, 0.09 and 0.12 ‰ for δ15N, δ18O, δO2/N2 and δAr/N2, and 0.67 mlSTP 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.

Ikumi Oyabu et al.

Interactive discussion

Status: final response (author comments only)
Status: final response (author comments only)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment

Ikumi Oyabu et al.

Ikumi Oyabu et al.

Viewed

Total article views: 283 (including HTML, PDF, and XML)
HTML PDF XML Total Supplement BibTeX EndNote
187 88 8 283 28 11 7
  • HTML: 187
  • PDF: 88
  • XML: 8
  • Total: 283
  • Supplement: 28
  • BibTeX: 11
  • EndNote: 7
Views and downloads (calculated since 09 Jun 2020)
Cumulative views and downloads (calculated since 09 Jun 2020)

Viewed (geographical distribution)

Total article views: 194 (including HTML, PDF, and XML) Thereof 194 with geography defined and 0 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 

Cited

Saved

No saved metrics found.

Discussed

No discussed metrics found.
Latest update: 21 Sep 2020
Publications Copernicus
Download
Short summary
Air in polar ice cores provides various information on past atmosphere and climate. We present a new method for simultaneously measuring eight gases (CH4, N2O and CO2 concentrations, isotopic ratios of N2 and O2, elemental ratios between N2, O2 and Ar, and total air content) from single ice core samples at high precisions.
Air in polar ice cores provides various information on past atmosphere and climate. We present a...
Citation