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Decreasing removal rate of the dissolved CO2 in Lake Nyos, Cameroon, after the installation of additional degassing pipes

T. Ohba, S. Ooki, Y. Oginuma, M. Kusakabe, Y. Yoshida, A. Ueda, K. Anazawa, K. Saiki, K. Kaneko, Y. Miyabuchi, Issa, F. Aka, W. Fantong, A. Ako, G. Tanyileke and J.V. Hell
Geological Society, London, Special Publications, 437, 177-184, 23 December 2015, https://doi.org/10.1144/SP437.6
T. Ohba
1Department of Chemistry, School of Science, Tokai University, 4-1-1 Kitakaname, Hiratsuka, Kanagawa 259-1292, Japan
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  • For correspondence: [email protected]
S. Ooki
1Department of Chemistry, School of Science, Tokai University, 4-1-1 Kitakaname, Hiratsuka, Kanagawa 259-1292, Japan
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Y. Oginuma
1Department of Chemistry, School of Science, Tokai University, 4-1-1 Kitakaname, Hiratsuka, Kanagawa 259-1292, Japan
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M. Kusakabe
2Department of Environmental and Chemistry, Faculty of Science, University of Toyama, 3193 Gofuku, Toyama-shi, Toyama 930-8555, Japan
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Y. Yoshida
3Yoshida Engineer, Office 3-46-10 Tsukigaoka, Morioka 020-0121 Japan
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A. Ueda
2Department of Environmental and Chemistry, Faculty of Science, University of Toyama, 3193 Gofuku, Toyama-shi, Toyama 930-8555, Japan
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K. Anazawa
4Department of Natural Environmental Studies, Graduate School of Frontier Sciences, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8561 Japan
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K. Saiki
5Department of Earth and Space Science, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043 Japan
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K. Kaneko
6Graduate School of Human and Environment Studies, Kyoto University, Yoshida-nihonmatsu, Sakyo-ku, Kyoto 606-8501 Japan
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Y. Miyabuchi
7Faculty of Education, Kumamoto University, Kurokami 2-40-1, Chuo-ku, Kumamoto 860-8555, Japan
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Issa
1Department of Chemistry, School of Science, Tokai University, 4-1-1 Kitakaname, Hiratsuka, Kanagawa 259-1292, Japan
8Institute for Geological and Mining Research, PO Box 4110 Yaounde, Cameroon
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F. Aka
8Institute for Geological and Mining Research, PO Box 4110 Yaounde, Cameroon
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W. Fantong
8Institute for Geological and Mining Research, PO Box 4110 Yaounde, Cameroon
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A. Ako
8Institute for Geological and Mining Research, PO Box 4110 Yaounde, Cameroon
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G. Tanyileke
8Institute for Geological and Mining Research, PO Box 4110 Yaounde, Cameroon
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J.V. Hell
8Institute for Geological and Mining Research, PO Box 4110 Yaounde, Cameroon
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Abstract

The amount of dissolved CO2 (CO2aq) in Lake Nyos, Cameroon, has been measured annually since January 2011. First, Embedded Image concentration was estimated by a chemical analysis with the assumption of equilibria between CO2aq, Embedded Image and Embedded Image. The estimated Embedded Image was correlated with the observed electrical conductivity of lake water. The profile of [CO2aq] was generated from the electrical conductivity, pH and temperature profiles. The [CO2aq] profile was integrated over the water column to obtain the total amount of CO2aq. The amounts were 8.4, 6.8, 5.5, 4.4 and 3.9 Gmol (=109 mol) in 2011, 2012, 2013, 2014 and 2015, respectively. The fast reduction between 2011 and 2013 was attributed to the installation of two additional degassing pipes in April 2011. However, the rate of reduction decreased between 2014 and 2015 due to the reduced [CO2aq] at the inlet of the degassing pipes.

  • © 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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Decreasing removal rate of the dissolved CO2 in Lake Nyos, Cameroon, after the installation of additional degassing pipes

T. Ohba, S. Ooki, Y. Oginuma, M. Kusakabe, Y. Yoshida, A. Ueda, K. Anazawa, K. Saiki, K. Kaneko, Y. Miyabuchi, Issa, F. Aka, W. Fantong, A. Ako, G. Tanyileke and J.V. Hell
Geological Society, London, Special Publications, 437, 177-184, 23 December 2015, https://doi.org/10.1144/SP437.6
T. Ohba
1Department of Chemistry, School of Science, Tokai University, 4-1-1 Kitakaname, Hiratsuka, Kanagawa 259-1292, Japan
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • For correspondence: [email protected]
S. Ooki
1Department of Chemistry, School of Science, Tokai University, 4-1-1 Kitakaname, Hiratsuka, Kanagawa 259-1292, Japan
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
Y. Oginuma
1Department of Chemistry, School of Science, Tokai University, 4-1-1 Kitakaname, Hiratsuka, Kanagawa 259-1292, Japan
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
M. Kusakabe
2Department of Environmental and Chemistry, Faculty of Science, University of Toyama, 3193 Gofuku, Toyama-shi, Toyama 930-8555, Japan
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
Y. Yoshida
3Yoshida Engineer, Office 3-46-10 Tsukigaoka, Morioka 020-0121 Japan
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
A. Ueda
2Department of Environmental and Chemistry, Faculty of Science, University of Toyama, 3193 Gofuku, Toyama-shi, Toyama 930-8555, Japan
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
K. Anazawa
4Department of Natural Environmental Studies, Graduate School of Frontier Sciences, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8561 Japan
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
K. Saiki
5Department of Earth and Space Science, Graduate 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
K. Kaneko
6Graduate School of Human and Environment Studies, Kyoto University, Yoshida-nihonmatsu, Sakyo-ku, Kyoto 606-8501 Japan
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
Y. Miyabuchi
7Faculty of Education, Kumamoto University, Kurokami 2-40-1, Chuo-ku, Kumamoto 860-8555, Japan
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
Issa
1Department of Chemistry, School of Science, Tokai University, 4-1-1 Kitakaname, Hiratsuka, Kanagawa 259-1292, Japan
8Institute for Geological and Mining Research, PO Box 4110 Yaounde, Cameroon
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
F. Aka
8Institute for Geological and Mining Research, PO Box 4110 Yaounde, Cameroon
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
W. Fantong
8Institute for Geological and Mining Research, PO Box 4110 Yaounde, Cameroon
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  • Search for this author on this site
A. Ako
8Institute for Geological and Mining Research, PO Box 4110 Yaounde, Cameroon
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  • Search for this author on this site
G. Tanyileke
8Institute for Geological and Mining Research, PO Box 4110 Yaounde, Cameroon
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  • Search for this author on this site
J.V. Hell
8Institute for Geological and Mining Research, PO Box 4110 Yaounde, Cameroon
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  • Search for this author on this site

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Decreasing removal rate of the dissolved CO2 in Lake Nyos, Cameroon, after the installation of additional degassing pipes

T. Ohba, S. Ooki, Y. Oginuma, M. Kusakabe, Y. Yoshida, A. Ueda, K. Anazawa, K. Saiki, K. Kaneko, Y. Miyabuchi, Issa, F. Aka, W. Fantong, A. Ako, G. Tanyileke and J.V. Hell
Geological Society, London, Special Publications, 437, 177-184, 23 December 2015, https://doi.org/10.1144/SP437.6
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