What is the maximum potential for CO2 sequestration by "stimulated" weathering on the global scale?
What is the maximum potential for CO2 sequestration by "stimulated" weathering on the global scale?
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DOI：
10.1007/s00114-008-0434-4
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发表时间：
2008-12-01
影响因子：
--
通讯作者：
Kempe, Stephan
中科院分区：
文献类型：
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作者：
Hartmann, Jens;Kempe, Stephan
硅酸盐岩石的自然化学风化作用是土壤和大气CO2的重要汇。先前的研究表明，将细碎的硅酸盐岩石应用于农业地区或森林可能会刺激自然化学风化[刺激风化（SW）]。然而，在现实条件下，这项技术是否能够在全球范围内隔离大量的二氧化碳，目前尚不清楚。通过对文献综述中“正常处理”量的初步估计，我们在这里报告了如果在世界上所有农业和森林地区均匀应用SW，理论上全球最大潜力为6510 (6)t C a(1)。这相当于人为二氧化碳排放量的0.9%（参照期2000-2005年）。然而，首先，由于物流问题，假设在大多数考虑的地区应用SW在经济上是不可可行的，其次，由于应用本身的能源需求，预计净二氧化碳固存量仅占消耗二氧化碳的一小部分（目前约为11%）。除非在申请程序上有所进展，否则近期实际的最大净二氧化碳消耗量潜力预计将远低于人为排放量的0.1%，因此，水处理不会成为降低大气二氧化碳浓度的关键技术之一。然而，文献表明，对于一些农业地区（农田），特别是潮湿气候下的水稻产区，这种SW可能是支持国际封存二氧化碳努力的可行工具。如果将SW与未来的二氧化碳排放证书交易挂钩，并考虑到作物产量的增加，那么SW在这些地区可能具有成本效益。
Natural chemical weathering of silicate rocks is a significant sink for soil and atmospheric CO2. Previous work suggested that natural chemical weathering may be stimulated by applying finely ground silicate rocks to agricultural areas or forests [stimulated weathering (SW)]. However, it remained unknown if this technique is practical to sequester globally significant amounts of CO2 under realistic conditions. Applying first estimates of "normal treatment" amounts from a literature review, we report here a theoretical global maximum potential of 65 10(6) t sequestered C a(-1) if SW would be applied homogenously on all agricultural and forested areas of the world. This is equivalent to 0.9% of anthropogenic CO2 emissions (reference period 2000-2005). First, however, the assumed application of SW on most of the considered areas is not economically feasible because of logistic issues, and second the net-CO2 sequestration is expected to amount to only a fraction of consumed CO2 due to the energy demand of the application itself (currently similar to 11%). Unless progress in application procedures is provided, the recent realistic maximum net-CO2-consumption potential is expected to be much smaller than 0.1% of anthropogenic emissions, and the SW would thus not be one of the key techniques to reduce atmospheric CO2 concentration. However, literature suggests that for some agricultural areas (croplands) and specifically for rice production areas in humid climates, this SW may be a feasible tool to support international efforts to sequester CO2. SW may be cost effective for those areas if linked to the CO2-emission certificate trade in the future, and increases in crop production are taken into account.