Longman, Jack, Palmer, Martin R. and Gernon, Thomas M. (2020) Viability of greenhouse gas removal via artificial addition of volcanic ash to the ocean. Anthropocene, 32, [100264]. (doi:10.1016/j.ancene.2020.100264).
Abstract
Mitigating human contributions to climate change is a highly debated topic, as it becomes evident that many nations do not adhere to optional reductions in global emission. Substantial research is taking place into negative carbon technologies that actively reduce the amount of atmospheric carbon dioxide (CO 2) via greenhouse gas removal (GGR). Various GGR methods have been proposed, from reforestation to ocean fertilisation. This article discusses advantages of an approach based on enhanced input of tephra to the ocean, to increase the drawdown of atmospheric CO 2. Natural addition of tephra to the ocean results in preservation of enhanced organic matter in sediment. Hence, augmenting its delivery should raise the level of sequestration. Calculations indicate that offshore tephra addition could sequester 2750 tonnes of CO 2 per 50,000 tonnes of ash delivered (a typical bulk carrier's capacity). The cost is estimated as ∼$55 per tonne of CO 2 sequestered and is an order of magnitude cheaper than many proposed GGR technologies. Further advantages include: tephra addition is simply an augmentation of a natural Earth process, it is a low technology approach that requires few developments, and it may sequester carbon for thousands of years. Hence, offshore tephra addition warrants further investigation to assess its viability.
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- Current Faculties > Faculty of Environmental and Life Sciences > School of Ocean and Earth Science > Geochemistry
School of Ocean and Earth Science > Geochemistry - Faculties (pre 2018 reorg) > Faculty of Engineering and the Environment (pre 2018 reorg) > Southampton Marine & Maritime Institute (pre 2018 reorg)
- Faculties (pre 2018 reorg) > Faculty of Natural and Environmental Sciences (pre 2018 reorg) > Institute for Life Sciences (pre 2018 reorg)
Current Faculties > Faculty of Environmental and Life Sciences > Institute for Life Sciences > Institute for Life Sciences (pre 2018 reorg)
Institute for Life Sciences > Institute for Life Sciences (pre 2018 reorg) - Faculties (pre 2018 reorg) > Faculty of Natural and Environmental Sciences (pre 2018 reorg) > Ocean and Earth Science (pre 2018 reorg) > Geochemistry (pre 2018 reorg)
Current Faculties > Faculty of Environmental and Life Sciences > School of Ocean and Earth Science > Ocean and Earth Science (pre 2018 reorg) > Geochemistry (pre 2018 reorg)
School of Ocean and Earth Science > Ocean and Earth Science (pre 2018 reorg) > Geochemistry (pre 2018 reorg) - Current Faculties > Faculty of Environmental and Life Sciences > School of Ocean and Earth Science > Geology and Geophysics
School of Ocean and Earth Science > Geology and Geophysics - Current Faculties > Faculty of Environmental and Life Sciences > School of Ocean and Earth Science > SPITFIRE DTP
School of Ocean and Earth Science > SPITFIRE DTP
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