Coastal spreading of olivine to control atmospheric CO2 concentrations: A critical analysis of viability
Coastal spreading of olivine to control atmospheric CO2 concentrations: A critical analysis of viability
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DOI：
10.1016/j.ijggc.2009.07.001
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发表时间：
2009-12-01
影响因子：
3.9
通讯作者：
Spiers, Christopher J.
中科院分区：
文献类型：
--
作者：
Hangx, Suzanne J. T.;Spiers, Christopher J.
通过沿地球海岸线沿着散布破碎的橄榄石岩，从而加速风化反应，来控制大气CO2浓度的定性建议目前正引起相当大的关注。本文提供了一个关键的概念评估，定量证明它是否可以显着促进CO2封存。这一概念的可行性取决于橄榄石溶解的速率、主导反应的封存能力及其CO2足迹。动力学计算表明，抵消30%的全球1990年二氧化碳排放量的海滩风化意味着每年分布的5.0 Gt的橄榄石。对于15-25摄氏度的平均海水温度，橄榄石砂（300微米粒度）需要700-2100年才能达到必要的稳定状态封存率，因此几乎没有实用价值。为了在15-20年内获得有用的稳态CO2吸收率，需要粒度
Qualitative proposals to control atmospheric CO2 concentrations by spreading crushed olivine rock along the Earth's coastlines, thereby accelerating weathering reactions, are presently attracting considerable attention. This paper provides a critical evaluation of the concept, demonstrating quantitatively whether or not it can contribute significantly to CO2 sequestration. The feasibility of the concept depends on the rate of olivine dissolution, the sequestration capacity of the dominant reaction, and its CO2 footprint. Kinetics calculations show that offsetting 30% of worldwide 1990 CO2 emissions by beach weathering means distributing of 5.0 Gt of olivine per year. For mean seawater temperatures of 15-25 degrees C, olivine sand (300 mu m grain size) takes 700-2100 years to reach the necessary steady state sequestration rate and is therefore of little practical value. To obtain useful, steady state CO2 uptake rates within 15-20 years requires grain sizes