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Vertical distribution of dissolved CO2 in lakes Nyos and Monoun (Cameroon) as estimated by sound speed in water

Kazuto Saiki, Katsuya Kaneko, Takeshi Ohba, Mitsuhisa Sanemasa, Minoru Kusakabe, Romaric Ntchantcho, Alain Fouepe, Gregory Tanyileke and Joseph V. Hell
Geological Society, London, Special Publications, 437, 185-192, 18 February 2016, https://doi.org/10.1144/SP437.10
Kazuto Saiki
1Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan
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  • For correspondence: ksaiki@ess.sci.osaka-u.ac.jp
Katsuya Kaneko
2Graduate School of Human and Environmental Studies, Kyoto University, Yoshida-nihonmatsu-cho, Sakyo-ku, Kyoto 606-8501, Japan
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Takeshi Ohba
3School of Science, Tokai University, 4-1-1 Kitakaname, Hiratsuka, Kanagawa 259-1292, Japan
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Mitsuhisa Sanemasa
1Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan
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Minoru Kusakabe
4Department of Biology and Chemistry, University of Toyama, 3190 Gofuku, Toyama-shi, Toyama 930-8555, Japan
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Romaric Ntchantcho
5Institute for Geological and Mining Res. (IRGM), BP 4110 Yaounde, Cameroon
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Alain Fouepe
5Institute for Geological and Mining Res. (IRGM), BP 4110 Yaounde, Cameroon
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Gregory Tanyileke
5Institute for Geological and Mining Res. (IRGM), BP 4110 Yaounde, Cameroon
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Joseph V. Hell
5Institute for Geological and Mining Res. (IRGM), BP 4110 Yaounde, Cameroon
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Abstract

Vertical profiles of sound speed (SS) in lake water were measured at lakes Nyos and Monoun (Cameroon) in 2012 and 2014. A significant linear correlation with Pearson's r of 0.987 to 0.995 between total CO2 concentration ([CO2]=[CO2(aq)]+[HCO3−]) and SS excess (Δv) in water was found. Based on this correlation, we propose the SS method as a new simple tool to monitor CO2 concentration in lakes Nyos and Monoun. We applied this method to multipoint measurements of CO2 in lakes Nyos and Monoun, and found horizontal differences between CO2 distributions in the two lakes. The results indicated that Lake Nyos water was stably stratified, and the total CO2 decreased from 2012 to 2014. At Lake Monoun, which consists of three basins (the western basin, the central basin, and the main basin), waters in the western and central basins exhibited a higher dissolved CO2 content than those in the main basin at the same depth. An increase in CO2 was also detected in the main basin from 2012 to 2014.

  • © 2017 The Author(s). Published by The Geological Society of London. All rights reserved
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Geological Society, London, Special Publications: 437 (1)
Geological Society, London, Special Publications
Volume 437
2017
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Vertical distribution of dissolved CO2 in lakes Nyos and Monoun (Cameroon) as estimated by sound speed in water

Kazuto Saiki, Katsuya Kaneko, Takeshi Ohba, Mitsuhisa Sanemasa, Minoru Kusakabe, Romaric Ntchantcho, Alain Fouepe, Gregory Tanyileke and Joseph V. Hell
Geological Society, London, Special Publications, 437, 185-192, 18 February 2016, https://doi.org/10.1144/SP437.10
Kazuto Saiki
1Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • For correspondence: ksaiki@ess.sci.osaka-u.ac.jp
Katsuya Kaneko
2Graduate School of Human and Environmental Studies, Kyoto University, Yoshida-nihonmatsu-cho, Sakyo-ku, Kyoto 606-8501, Japan
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Takeshi Ohba
3School of Science, Tokai University, 4-1-1 Kitakaname, Hiratsuka, Kanagawa 259-1292, Japan
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Mitsuhisa Sanemasa
1Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan
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Minoru Kusakabe
4Department of Biology and Chemistry, University of Toyama, 3190 Gofuku, Toyama-shi, Toyama 930-8555, Japan
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Romaric Ntchantcho
5Institute for Geological and Mining Res. (IRGM), BP 4110 Yaounde, Cameroon
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Alain Fouepe
5Institute for Geological and Mining Res. (IRGM), BP 4110 Yaounde, Cameroon
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Gregory Tanyileke
5Institute for Geological and Mining Res. (IRGM), BP 4110 Yaounde, Cameroon
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Joseph V. Hell
5Institute for Geological and Mining Res. (IRGM), BP 4110 Yaounde, Cameroon
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Vertical distribution of dissolved CO2 in lakes Nyos and Monoun (Cameroon) as estimated by sound speed in water

Kazuto Saiki, Katsuya Kaneko, Takeshi Ohba, Mitsuhisa Sanemasa, Minoru Kusakabe, Romaric Ntchantcho, Alain Fouepe, Gregory Tanyileke and Joseph V. Hell
Geological Society, London, Special Publications, 437, 185-192, 18 February 2016, https://doi.org/10.1144/SP437.10
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