Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1073/pnas.1921544118 |
Coal fly ash is a major carbon flux in the Chang Jiang (Yangtze River) basin | |
Gen K. Li; Woodward W. Fischer; Michael P. Lamb; A. Joshua West; Ting Zhang; Valier Galy; Xingchen Tony Wang; Shilei Li; Hongrui Qiu; Gaojun Li; Liang Zhao; Jun Chen; Junfeng Ji | |
2021-05-25 | |
发表期刊 | Proceedings of the National Academy of Science |
出版年 | 2021 |
英文摘要 | Fly ash—the residuum of coal burning—contains a considerable amount of fossilized particulate organic carbon (FOCash) that remains after high-temperature combustion. Fly ash leaks into natural environments and participates in the contemporary carbon cycle, but its reactivity and flux remained poorly understood. We characterized FOCash in the Chang Jiang (Yangtze River) basin, China, and quantified the riverine FOCash fluxes. Using Raman spectral analysis, ramped pyrolysis oxidation, and chemical oxidation, we found that FOCash is highly recalcitrant and unreactive, whereas shale-derived FOC (FOCrock) was much more labile and easily oxidized. By combining mass balance calculations and other estimates of fly ash input to rivers, we estimated that the flux of FOCash carried by the Chang Jiang was 0.21 to 0.42 Mt C⋅y−1 in 2007 to 2008—an amount equivalent to 37 to 72% of the total riverine FOC export. We attributed such high flux to the combination of increasing coal combustion that enhances FOCash production and the massive construction of dams in the basin that reduces the flux of FOCrock eroded from upstream mountainous areas. Using global ash data, a first-order estimate suggests that FOCash makes up to 16% of the present-day global riverine FOC flux to the oceans. This reflects a substantial impact of anthropogenic activities on the fluxes and burial of fossil organic carbon that has been made less reactive than the rocks from which it was derived. |
领域 | 地球科学 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/328752 |
专题 | 地球科学 |
推荐引用方式 GB/T 7714 | Gen K. Li,Woodward W. Fischer,Michael P. Lamb,et al. Coal fly ash is a major carbon flux in the Chang Jiang (Yangtze River) basin[J]. Proceedings of the National Academy of Science,2021. |
APA | Gen K. Li.,Woodward W. Fischer.,Michael P. Lamb.,A. Joshua West.,Ting Zhang.,...&Junfeng Ji.(2021).Coal fly ash is a major carbon flux in the Chang Jiang (Yangtze River) basin.Proceedings of the National Academy of Science. |
MLA | Gen K. Li,et al."Coal fly ash is a major carbon flux in the Chang Jiang (Yangtze River) basin".Proceedings of the National Academy of Science (2021). |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论