globalchange  > 气候变化与战略
DOI: 10.1073/pnas.1702953114
论文题名:
Glacial weathering; sulfide oxidation; and global carbon cycle feedbacks
作者: Torres M.A.; Moosdorf N.; Hartmann J.; Adkins J.F.; West A.J.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2017
卷: 114, 期:33
起始页码: 8716
结束页码: 8721
语种: 英语
英文关键词: Carbon cycle ; Glaciation ; Oxidation ; Sulfide ; Weathering
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
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.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/162310
Appears in Collections:气候变化与战略

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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 Angeles, CA 90089, United States

Recommended Citation:
Torres M.A.,Moosdorf N.,Hartmann J.,et al. Glacial weathering; sulfide oxidation; and global carbon cycle feedbacks[J]. Proceedings of the National Academy of Sciences of the United States of America,2017-01-01,114(33)
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