气候变化领域集成服务门户(CCPortal): Glacial weathering; sulfide oxidation; and global carbon cycle feedbacks

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DOI	10.1073/pnas.1702953114
	Glacial weathering; sulfide oxidation; and global carbon cycle feedbacks
	Torres M.A.; Moosdorf N.; Hartmann J.; Adkins J.F.; West A.J.
发表日期	2017
ISSN	0027-8424
起始页码	8716
结束页码	8721
卷号	114 期号:33
英文摘要	Connections between glaciation, chemical weathering, and the global carbon cycle could steer the evolution of global climate over geologic time, but even the directionality of feedbacks in this system remain to be resolved. Here, we assemble a compilation of hydrochemical data from glacierized catchments, use this data to evaluate the dominant chemical reactions associated with glacial weathering, and explore the implications for long-term geochemical cycles. Weathering yields from catchments in our compilation are higher than the global average, which results, in part, from higher runoff in glaciated catchments. Our analysis supports the theory that glacial weathering is characterized predominantly by weathering of trace sulfide and carbonate minerals. To evaluate the effects of glacial weathering on atmospheric pCO2, we use a solute mixing model to predict the ratio of alkalinity to dissolved inorganic carbon (DIC) generated by weathering reactions. Compared with nonglacial weathering, glacial weathering is more likely to yield alkalinity/DIC ratios less than 1, suggesting that enhanced sulfide oxidation as a result of glaciation may act as a source of CO2 to the atmosphere. Back-of-the-envelope calculations indicate that oxidative fluxes could change ocean–atmosphere CO2 equilibrium by 25 ppm or more over 10 ky. Over longer timescales, CO2 release could act as a negative feedback, limiting progress of glaciation, dependent on lithology and the concentration of atmospheric O2. Future work on glaciation–weathering–carbon cycle feedbacks should consider weathering of trace sulfide minerals in addition to silicate minerals. © 2017, National Academy of Sciences. All rights reserved.
英文关键词	Carbon cycle; Glaciation; Oxidation; Sulfide; Weathering
语种	英语
scopus关键词	carbon; carbon dioxide; carbonic acid; sulfide; alkalinity; Article; atmosphere; carbon cycle; carbon dioxide tension; catchment; chemical reaction; feedback system; glaciation; oxidation; priority journal; runoff; sea; weathering
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/159057
作者单位	Torres, M.A., Department of Earth Sciences, University of Southern California, Los Angeles, CA 90089, United States, Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, United States, Department of Earth, Environmental, and Planetary Sciences, Rice University, Houston, TX 77005, United States; Moosdorf, N., Department of Earth Sciences, University of Southern California, Los Angeles, CA 90089, United States, Institute for Geology, Center for Earth System Research and Sustainability (CEN), Universität Hamburg, Hamburg, 20146, Germany, Leibniz Center for Tropical Marine Research, Bremen, 28359, Germany; Hartmann, J., Institute for Geology, Center for Earth System Research and Sustainability (CEN), Universität Hamburg, Hamburg, 20146, Germany; Adkins, J.F., Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, United States; West, A.J., Department of Earth Sciences, University of Southern California, Los ...
推荐引用方式 GB/T 7714	Torres M.A.,Moosdorf N.,Hartmann J.,et al. Glacial weathering; sulfide oxidation; and global carbon cycle feedbacks[J],2017,114(33).
APA	Torres M.A.,Moosdorf N.,Hartmann J.,Adkins J.F.,&West A.J..(2017).Glacial weathering; sulfide oxidation; and global carbon cycle feedbacks.Proceedings of the National Academy of Sciences of the United States of America,114(33).
MLA	Torres M.A.,et al."Glacial weathering; sulfide oxidation; and global carbon cycle feedbacks".Proceedings of the National Academy of Sciences of the United States of America 114.33(2017).