Olivine is the perfect rock for the job. Olaf Schuiling, a geochemist at Utrecht University in the Netherlands and a passionate advocate of enhanced weathering, proposes spreading coarse olivine grains on … 107, 2010, pp. Enhanced weathering of olivine has been suggested as a measure to lower the atmospheric CO 2 level and it might also mitigate ocean acidification. One group of researchers who analyzed the potential effects of spreading olivine over nearly one third of earth's tropical land could reduce atmospheric carbon dioxide concentration by between 30ppm and 300ppm by 2100. However, the The … Miriam González and Tatiana Ilyina, “Impacts of artificial ocean alkalinization on the carbon cycle and climate in Earth system simulations,” Geophysical Research Letters, Vol. How Will Geoengineering Aerosols Affect Air Temperature. Geochemical thermodynamic equilibrium modelling was used, which considered both the variable mineralogical composition of olivine and the kinds of secondary precipitates that may be formed. When olivine is crushed, it weathers completely within a few years, depending on the grain size. Maintenance of supersaturation for calcite or aragonite as holds in seawater reduces the efficiency by about a factor of two compared to the efficiency without secondary precipitation. When Fe-bearing olivine undergoes weathering in an oxic environment, Fe(III) hydroxides will inevitably be formed, and as a result of this acidifying process, CO2 could be released to the atmosphere. This procedure would give the Amazon and Congo river basins the artificial silicate weathering potentials to sequester annually up to 4.35 and 0.64 Pg of carbon, respectively. When implemented in coastal environments, olivine weathering is expected to increase seawater alkalinity, thus resulting in additional CO 2 uptake from the atmosphere. It is now widely accepted that anthropogenic warming needs to be limited to not more than 2°C to preserve the Holocene mode of operation of the climate system and thus to prevent intolerable risks for humankind (Schellnhuber et al., 2016). Enhanced weathering on land (terrestrial) Mined olivine (magnesium iron silicate) is ground to a powder and either dumped on beaches where wave action disperses it into water or is spread on land. Removal by reactions with olivine is an attractive option, because it is widely available and reacts easily with the (acid) CO2 from the atmosphere. Published by Elsevier B.V. https://doi.org/10.1016/j.scitotenv.2016.09.008. Enhanced Weathering of Olivine – Overview and Initial Results | Nasir et al. The mineral olivine reacts naturally with atmospheric CO₂. Large scale mining operations would be required to implement this kind of scheme, and the process would harm ecosystems and communities. Cquestrate, “Detailed description of the idea,” http://www.cquestrate.com/the-idea/detailed-description-of-the-idea/, 14. The rate at which these minerals would dissolve, as well as the expense involved in amassing and dispersing enough of them to make an impact, is a major practical concern, as is the effect on the complex ocean ecosystem.2 The increased demand for minerals would also translate into increased mining activities, with the above-mentioned impacts.3, The Leverhulme Centre for Climate Change mitigation in the UK is conducting enhanced weathering field trials in the USA, Australia and Malaysia. When implemented in coastal environments, olivine weathering is expected to increase seawater alkalinity, thus resulting in additional CO2uptake from the atmosphere. Ocean alkalinisation only happens when more than 1 mol/kgH2O Mg-rich olivine weathers. It is a prime candidate for enhanced silicate weathering. [1] The minerals then react with the CO₂ in the air and the water from rain over time until completely dissolved. 6, 2015, pp. © 2016 The Author. Here you can find information on current research, news and developments on the use of oli vine against O cean A cidification. Enhanced weathering in the oceans (marine), This technique, similar to treating acidic agricultural lands with lime, proposes adding chemical carbonates to the ocean to theoretically increase alkalinity and therefore carbon uptake. Enhanced weathering on land (terrestrial) The idea is to control levels of atmospheric CO2 through natural chemical weathering processes 1 that draw CO2 out of the atmosphere (referred to as carbonation) and sequester it in newly-formed rock mineral, … ScienceDirect ® is a registered trademark of Elsevier B.V. ScienceDirect ® is a registered trademark of Elsevier B.V. 1st Place: Project Vesta: Olivine-Accelerated Coastal Enhanced Weathering. Schuiling1 and 0.TickeJJ2 10lii1ine … Copyright © 2020 Elsevier B.V. or its licensors or contributors. Kruger was one of the authors promoting a set of principles for governance that have been influential among the geoengineering proponents, including the astonishing notion that geoengineering is a public good. David Keller et al., “Potential climate engineering effectiveness and side effects during a high carbon dioxide-emission scenario,” Nature Communications, Vol. We acquire nearby olivine and transport it to beaches where wave action speeds up the carbon dioxide capture process, while also de-acidifying the ocean. 43, 2016, 3. OLIvOA is a research initiative investigating the use of enhanced weathering of the silicate mineral olivine against Ocean Acidification. Before enhanced weathering of olivine in coastal environments can be considered an option for realizing negative CO2 emissions for climate mitigation purposes, these aspects need further experimental assessment. An untapped opportunity Mineral weathering is one of the main mechanisms the planet uses to recycle carbon dioxide across geological time scales. Precipitation of sepiolite as Mg silicate reduces the efficiency even more. We make green-sand beaches with a highly abundant volcanic mineral, olivine. Olivine can also be scattered in the roadside. 3rd Place: … ETC Group and Heinrich Böll Foundation, “Geoengineering Map.” map.geoengineeringmonitor.org, The Big Bad Fix: The Case Against Climate Geoengineering, http://etcgroup.org/content/big-bad-fix, 1. It can also be applied extensively, by spreading fine … In the case of Olivine, it is abundant and is fast at weathering. Silicate rock called olivine is one type of rock that can take out... 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