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Sequestering atmospheric carbon dioxide by increasing ocean alkalinity

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  • Kheshgi, Haroon S.

Abstract

We present a preliminary analysis of a geoengineering option based on the intentional increase of ocean alkalinity to enhance marine storage of atmospheric CO2. Like all geoengineering techniques to limit climate change, with today's limited understandig of the climate system, this approach must be regarded as a potential strategic option that requires ongoing assessment to establish its potential benefits and side effecs. CO2 would be absorbed from the atmosphere by the oceans at an increased rate if ocean alkalinity were raised. Ocean alkalinity might be raised by introducing the dissolution products of alkaline minerals into the oceans. The limited deposits of naturally occurring soda ash (Na2CO3) are readily soluble and easily mined. Limestone (CaCO3) is abundant in the Earth's crust but is not readily soluble. This analysis explores the potential feasibility and limits of such approaches.

Suggested Citation

  • Kheshgi, Haroon S., 1995. "Sequestering atmospheric carbon dioxide by increasing ocean alkalinity," Energy, Elsevier, vol. 20(9), pages 915-922.
    • Handle: RePEc:eee:energy:v:20:y:1995:i:9:p:915-922
    DOI: 10.1016/0360-5442(95)00035-F
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    Cited by:

    1. Sarah Gore & Phil Renforth & Rupert Perkins, 2019. "The potential environmental response to increasing ocean alkalinity for negative emissions," Mitigation and Adaptation Strategies for Global Change, Springer, vol. 24(7), pages 1191-1211, October.
    2. Stefano Caserini & Beatriz Barreto & Caterina Lanfredi & Giovanni Cappello & Dennis Ross Morrey & Mario Grosso, 2019. "Affordable CO2 negative emission through hydrogen from biomass, ocean liming, and CO2 storage," Mitigation and Adaptation Strategies for Global Change, Springer, vol. 24(7), pages 1231-1248, October.
    3. Guo, Fuxing & Wang, Yanping & Zhu, Haoyong & Zhang, Chuangye & Sun, Haowei & Fang, Zhuling & Yang, Jing & Zhang, Linsen & Mu, Yan & Man, Yu Bon & Wu, Fuyong, 2023. "Crop productivity and soil inorganic carbon change mediated by enhanced rock weathering in farmland: A comparative field analysis of multi-agroclimatic regions in central China," Agricultural Systems, Elsevier, vol. 210(C).
    4. Hanak, Dawid P. & Jenkins, Barrie G. & Kruger, Tim & Manovic, Vasilije, 2017. "High-efficiency negative-carbon emission power generation from integrated solid-oxide fuel cell and calciner," Applied Energy, Elsevier, vol. 205(C), pages 1189-1201.
    5. Rob Swart & Natasha Marinova, 2010. "Policy options in a worst case climate change world," Mitigation and Adaptation Strategies for Global Change, Springer, vol. 15(6), pages 531-549, August.
    6. Naomi Vaughan & Timothy Lenton, 2011. "A review of climate geoengineering proposals," Climatic Change, Springer, vol. 109(3), pages 745-790, December.
    7. Rau, Greg H. & Baird, Jim R., 2018. "Negative-CO2-emissions ocean thermal energy conversion," Renewable and Sustainable Energy Reviews, Elsevier, vol. 95(C), pages 265-272.
    8. Renforth, P. & Jenkins, B.G. & Kruger, T., 2013. "Engineering challenges of ocean liming," Energy, Elsevier, vol. 60(C), pages 442-452.
    9. Tan, Raymond R. & Aviso, Kathleen B. & Foo, Dominic C.Y. & Lee, Jui-Yuan & Ubando, Aristotle T., 2019. "Optimal synthesis of negative emissions polygeneration systems with desalination," Energy, Elsevier, vol. 187(C).

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