DOI: 10.1016/j.epsl.2020.116239
论文题名: A numerical examination of the effect of sulfide dissolution on silicate weathering
作者: Kanzaki Y. ; Brantley S.L. ; Kump L.R.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 539 语种: 英语
中文关键词: 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
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. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165069
Appears in Collections: 气候变化与战略
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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
Recommended Citation:
Kanzaki Y.,Brantley S.L.,Kump L.R.. A numerical examination of the effect of sulfide dissolution on silicate weathering[J]. Earth and Planetary Science Letters,2020-01-01,539