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DOI | 10.1073/pnas.1921544118 |
Coal fly ash is a major carbon flux in the Chang Jiang (Yangtze river) basin | |
Li G.K.; Fischer W.W.; Lamb M.P.; West A.J.; Zhang T.; Galy V.; Wang X.T.; Li S.; Qiu H.; Li G.; Zhao L.; Chen J.; Ji J. | |
发表日期 | 2021 |
ISSN | 0027-8424 |
卷号 | 118期号:21 |
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. © 2021 National Academy of Sciences. All rights reserved. |
英文关键词 | Carbon cycle; Chang Jiang (Yangtze River); Coal; Fly ash; Sediment transport |
语种 | 英语 |
scopus关键词 | carbon; fossilized particulate organic carbon; organic carbon; unclassified drug; Article; carbon cycle; China; combustion; controlled study; environmental parameters; fly ash; geographic names; human impact (environment); mass balance; oil shale; oxidation; pyrolysis; Raman spectrometry; river basin; rock; sediment transport; Yangtze River |
来源期刊 | Proceedings of the National Academy of Sciences of the United States of America |
文献类型 | 期刊论文 |
条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/238559 |
作者单位 | Key Laboratory of Surficial Geochemistry, Ministry of Education, School of Earth Sciences and Engineering, Nanjing University, Nanjing, 210023, China; Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, United States; Department of Earth Sciences, University of Southern California, Los Angeles, CA 90089, United States; Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institute, Woods Hole, MA 02543, United States; Department of Earth and Environmental Sciences, Boston College, Chestnut Hill, MA 02467, United States; Department of Earth, Environmental and Planetary Sciences, Rice University, Houston, TX 77005, United States |
推荐引用方式 GB/T 7714 | Li G.K.,Fischer W.W.,Lamb M.P.,et al. Coal fly ash is a major carbon flux in the Chang Jiang (Yangtze river) basin[J],2021,118(21). |
APA | Li G.K..,Fischer W.W..,Lamb M.P..,West A.J..,Zhang T..,...&Ji J..(2021).Coal fly ash is a major carbon flux in the Chang Jiang (Yangtze river) basin.Proceedings of the National Academy of Sciences of the United States of America,118(21). |
MLA | Li G.K.,et al."Coal fly ash is a major carbon flux in the Chang Jiang (Yangtze river) basin".Proceedings of the National Academy of Sciences of the United States of America 118.21(2021). |
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