Lamont-Doherty Earth Observatory of Columbia University, Palisades, New York 10964, United States.
Environ Sci Technol. 2013 Jul 2;47(13):7521-9. doi: 10.1021/es401531y. Epub 2013 Jun 21.
Reducing atmospheric CO2 using a combination of air capture and offshore geological storage can address technical and policy concerns with climate mitigation. Because CO2 mixes rapidly in the atmosphere, air capture could operate anywhere and in principle reduce CO2 to preindustrial levels. We investigate the Kerguelen plateau in the Indian Ocean, which offers steady wind resources, vast subseafloor storage capacities, and minimal risk of economic damages or human inconvenience and harm. The efficiency of humidity swing driven air capture under humid and windy conditions is tested in the laboratory. Powered by wind, we estimate ∼75 Mt CO2/yr could be collected using air capture and sequestered below seafloor or partially used for synfuel. Our analysis suggests that Kerguelen offers a remote and environmentally secure location for CO2 sequestration using renewable energy. Regional reservoirs could hold over 1500 Gt CO2, sequestering a large fraction of 21st century emissions.
利用空气捕捉和近海地质储存相结合来减少大气中的二氧化碳，可以解决气候缓解方面的技术和政策问题。由于二氧化碳在大气中迅速混合，空气捕捉可以在任何地方运行，并原则上将二氧化碳减少到工业化前的水平。我们研究了印度洋的凯尔盖朗高原，那里有稳定的风能资源、巨大的海底储存容量，并且经济损失或人类不便和伤害的风险最小。在实验室中测试了在潮湿和多风条件下湿度摆动驱动的空气捕捉的效率。利用风能，我们估计每年可以使用空气捕捉收集约 7500 万吨二氧化碳，并将其封存在海底以下，或者部分用于合成燃料。我们的分析表明，凯尔盖朗高原为利用可再生能源进行二氧化碳封存提供了一个偏远且环境安全的地点。区域水库可以容纳超过 15000 亿吨二氧化碳，封存了 21 世纪排放的很大一部分。
