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DOI	10.1016/j.epsl.2020.116239
	A numerical examination of the effect of sulfide dissolution on silicate weathering
	Kanzaki Y.; Brantley S.L.; Kump L.R.
发表日期	2020
ISSN	0012821X
卷号	539
英文摘要	Silicate weathering regulates climate on geological time scales as a net, climate-sensitive sink of atmospheric CO2. On the other hand, sulfuric acid produced through sulfide dissolution affects silicate weathering, diminishing its effectiveness as a climate regulator based on evidence from river chemistry. This study takes a theoretical approach to quantitatively examine the effect of sulfide dissolution, coupling a one-dimensional model of pyrite weathering to that of albite transformation to kaolinite. The coupled model reveals that when the reaction front of sulfide is deeper than that of silicates reacting with CO2, the silicate-weathering feedback on climate is not directly affected by sulfide dissolution, but only indirectly through oceanic processes such as reverse weathering and carbonate deposition. In turn, when sulfide dissolution occurs within zones of CO2-silicate reactions close to the surface, the feedback between climate and silicate weathering can be significantly weakened because sulfuric acid competes effectively with carbonic acid in mineral dissolution. As the depth of the sulfide reaction front can be changed by variations in water table depth, the latter feedback weakening could have occurred in concert with climate-change-driven water table fluctuations, amplifying atmospheric CO2 variations during the Phanerozoic. © 2020 Elsevier B.V.
关键词	atmospheric CO2 climate Phanerozoic silicate weathering sulfide weathering water table
英文关键词	Atmospheric chemistry; Carbon dioxide; Climate change; Climate models; Dissolution; Feldspar; Groundwater; Kaolinite; Pyrites; Silicates; Sulfur compounds; Sulfuric acid; Surface reactions; climate; Numerical examination; One-dimensional model; Phanerozoic; Silicate weathering; Theoretical approach; Water table fluctuations; Water tables; Weathering; carbon dioxide; chemical weathering; climate effect; dissolution; numerical method; Phanerozoic; river water; silicate; sulfide; water depth; water table
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202691
作者单位	Department of Earth and Planetary Sciences, University of California – Riverside, Riverside, CA 92521, United States; Earth and Environmental Systems Institute, The Pennsylvania State University, University Park, PA 16802, United States; Department of Geosciences, The Pennsylvania State University, University Park, PA 16802, United States
推荐引用方式 GB/T 7714	Kanzaki Y.,Brantley S.L.,Kump L.R.. A numerical examination of the effect of sulfide dissolution on silicate weathering[J],2020,539.
APA	Kanzaki Y.,Brantley S.L.,&Kump L.R..(2020).A numerical examination of the effect of sulfide dissolution on silicate weathering.Earth and Planetary Science Letters,539.
MLA	Kanzaki Y.,et al."A numerical examination of the effect of sulfide dissolution on silicate weathering".Earth and Planetary Science Letters 539(2020).