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Rapid Removal of Atmospheric CO_2 by Urban Soils

机译：城市土壤快速去除大气中的CO_2

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摘要

The measured calcium carbonate content of soils to a depth of 100 mm at a large urban development site has increased over 18 months at a rate that corresponds to the sequestration of 85 t of CO_2/ha (8.5 kg of CO_2 m~(-2) )annually. This is a consequence of rapid weathering of calcium silicate and hydroxide minerals derived from the demolition of concrete structures, which releases Ca that combines with CO_2 ultimately derived from the atmosphere, precipitating as calcite. Stable isotope data confirm an atmospheric origjn for carbonate carbon, and ~(14)C dating indicates the predominance of modern carbon in the pedogenic calcite. Trial pits show that carbonation extends to depths of ≥1 m. Work at other sites shows that the occurrence of pedogenic carbonates is widespread in artificially created urban soils containing Ca and Mg silicate minerals. Appropriate management of fewer than 12000 ha of urban land to maximize calcite precipitation has the potential to remove 1 million t of CO_2 from the atmosphere annually. The maximal global potential is estimated to be approximately 700-1200 Mt of CO_2 per year (representing 2.0-3.7% of total emissions from fossil fuel combustion) based on current rates of production of industry-derived Ca- and Mg-bearing materials.
机译：在一个大型的城市发展场所中，测得的土壤碳酸钙含量达到100毫米深，在过去的18个月中，其增加的速率相当于固存85 t CO_2 / ha（8.5 kg CO_2 m〜（-2） ）每年。这是由于混凝土结构拆除引起的硅酸钙和氢氧化物矿物快速风化的结果，它释放出的Ca与最终源自大气的CO_2结合，沉淀为方解石。稳定的同位素数据证实了碳酸盐碳的大气成因，〜（14）C定年表明在成岩方解石中现代碳占主导地位。试验坑表明，碳化作用扩展到≥1m的深度。在其他地点的工作表明，在含有Ca和Mg硅酸盐矿物的人工创造的城市土壤中，成岩碳酸盐的发生是普遍的。适当管理少于12,000公顷的城市土地以最大化方解石沉淀，每年有可能从大气中清除100万吨的CO_2。根据目前工业生产的含钙和镁的材料的生产率，最大的全球潜力估计为每年约700-1200 Mt CO_2（占化石燃料燃烧总排放量的2.0-3.7％）。

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  • 来源
    《Environmental Science & Technology》 |2015年第9期|5434-5440|共7页
  • 作者

    Carla-Leanne Washbourne; Elisa Lopez-Capel; Phil Renforth; Philippa L. Ascough; David A. C. Manning;

  • 作者单位

    School of Civil Engineering and Geosciences, Newcastle University, Newcastle upon Tyne NE1 7RU, U.K.,Department of Science, Technology, Engineering and Public Policy, University College London, 36-36 Fitzroy Square, London W1T 6EY, U.K.;

    School of Civil Engineering and Geosciences, Newcastle University, Newcastle upon Tyne NE1 7RU, U.K.;

    School of Earth & Ocean Sciences, Cardiff University, Cardiff CF10 3AT, U.K.;

    Scottish Universities Environmental Research Centre, Rankine Avenue, Scottish Enterprise Technology Park, East Kilbride G75 0QF, U.K.;

    School of Civil Engineering and Geosciences, Newcastle University, Newcastle upon Tyne NE1 7RU, U.K.;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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