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Original Research Papers

Atmospheric CO2 variations over the last three glacial–interglacial climatic cycles deduced from the Dome Fuji deep ice core, Antarctica using a wet extraction technique

Authors:

Kenji Kawamura ,

Center for Atmospheric and Oceanic Studies, Graduate School of Science, Tohoku University, Sendai 980-8578, JP; Climate and Environmental Physics, Physics Institute, University of Bern, Sidlerstrasse 5, CH-3012 Bern, CH
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Takakiyo Nakazawa,

Center for Atmospheric and Oceanic Studies, Graduate School of Science, Tohoku University, Sendai 980-8578, JP
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Shuji Aoki,

Center for Atmospheric and Oceanic Studies, Graduate School of Science, Tohoku University, Sendai 980-8578, JP
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Satoshi Sugawara,

Institute of Earth Science, Miyagi University of Education, Sendai 980-0845, JP
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Yoshiyuki Fujii,

National Institute of Polar Research, 1-9-10 Kaga, Itabashi-ku, Tokyo 173-8515, JP
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Okitsugu Watanabe

National Institute of Polar Research, 1-9-10 Kaga, Itabashi-ku, Tokyo 173-8515, JP
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Abstract

A deep ice core drilled at Dome Fuji, East Antarctica was analyzed for the CO2 concentration using a wet extraction method in order to reconstruct its atmospheric variations over the past 320 kyr, which includes three full glacial—interglacial climatic cycles, with a mean time resolution of about 1.1 kyr. The CO2 concentration values derived for the past 65 kyr are very close to those obtained from other Antarctic ice cores using dry extraction methods, although the wet extraction method is generally thought to be inappropriate for the determination of the CO2 concentration. The comparison between the CO2 and Ca2+ concentrations deduced from the Dome Fuji core suggests that calcium carbonate emitted from lands was mostly neutralized in the atmosphere before reaching the central part of Antarctica, or that only a small part of calcium carbonate was involved in CO2 production during the wet extraction process. The CO2 concentration for the past 320 kyr deduced from the Dome Fuji core varies between 190 and 300 ppmv, showing clear glacial—interglacial variations similar to the result of the Vostok ice core. However, for some periods, the concentration values of the Dome Fuji core are higher by up to 20 ppmv than those of the Vostok core. There is no clear indication that such differences are related to variations of chemical components of Ca2+, microparticle and acidity of the Dome Fuji core.

How to Cite: Kawamura, K., Nakazawa, T., Aoki, S., Sugawara, S., Fujii, Y. and Watanabe, O., 2003. Atmospheric CO2 variations over the last three glacial–interglacial climatic cycles deduced from the Dome Fuji deep ice core, Antarctica using a wet extraction technique. Tellus B: Chemical and Physical Meteorology, 55(2), pp.126–137. DOI: http://doi.org/10.3402/tellusb.v55i2.16730
  Published on 01 Jan 2003
 Accepted on 2 Dec 2002            Submitted on 21 Jan 2002

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