DOI: 10.1016/j.epsl.2018.05.022
Scopus记录号: 2-s2.0-85048463054
论文题名: Sulfur isotopes in rivers: Insights into global weathering budgets, pyrite oxidation, and the modern sulfur cycle
作者: Burke A. ; Present T.M. ; Paris G. ; Rae E.C.M. ; Sandilands B.H. ; Gaillardet J. ; Peucker-Ehrenbrink B. ; Fischer W.W. ; McClelland J.W. ; Spencer R.G.M. ; Voss B.M. ; Adkins J.F.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 496 起始页码: 168
结束页码: 177
语种: 英语
英文关键词: pyrite
; rivers
; sulfur
; weathering
Scopus关键词: Carbon dioxide
; Geographical regions
; Isotopes
; Pyrites
; Rivers
; Sulfate minerals
; Sulfur
; Weathering
; Carbonate weathering
; Cation concentrations
; Climatic regions
; Freshwater fluxes
; Oxidative weathering
; Pyrite oxidation
; Pyrite weathering
; Relative contribution
; Budget control
; anion
; biogeochemistry
; cation
; concentration (composition)
; oxidation
; pyrite
; river water
; sulfur isotope
; weathering
英文摘要: The biogeochemical sulfur cycle is intimately linked to the cycles of carbon, iron, and oxygen, and plays an important role in global climate via weathering reactions and aerosols. However, many aspects of the modern budget of the global sulfur cycle are not fully understood. We present new δ34S measurements on sulfate from more than 160 river samples from different geographical and climatic regions—more than 46% of the world's freshwater flux to the ocean is accounted for in this estimate of the global riverine sulfur isotope budget. These measurements include major rivers and their tributaries, as well as time series, and are combined with previously published data to estimate the modern flux-weighted global riverine δ34S as 4.4 ± 4.5‰ (V-CDT), and 4.8 ± 4.9‰ when the most polluted rivers are excluded. The sulfur isotope data, when combined with major anion and cation concentrations, allow us to tease apart the relative contributions of different processes to the modern riverine sulfur budget, resulting in new estimates of the flux of riverine sulfate due to the oxidative weathering of pyrites (1.3 ± 0.2 Tmol S/y) and the weathering of sedimentary sulfate minerals (1.5 ± 0.2 Tmol S/y). These data indicate that previous estimates of the global oxidative weathering of pyrite have been too low by a factor of two. As pyrite oxidation coupled to carbonate weathering can act as a source of CO2 to the atmosphere, this global pyrite weathering budget implies that the global CO2 weathering sink is overestimated. Furthermore, the large range of sulfur isotope ratios in modern rivers indicates that secular changes in the lithologies exposed to weathering through time could play a major role in driving past variations in the δ34S value of seawater. © 2018 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109793
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: University of St Andrews, St Andrews, United Kingdom; California Institute of Technology, Pasadena, CA, United States; CRPG, CNRS, Vandoeuvre-lès-Nancy, France; Institut de Physique du Globe de Paris (IPGP), Sorbonne Paris Cité, University Paris Diderot, CNRS, Paris, France; Institut Universitaire de France, France; Woods Hole Oceanographic Institution, Woods Hole, MA, United States; University of Texas at Austin, Austin, TX, United States; Florida State University, TallahasseeFL, United States
Recommended Citation:
Burke A.,Present T.M.,Paris G.,et al. Sulfur isotopes in rivers: Insights into global weathering budgets, pyrite oxidation, and the modern sulfur cycle[J]. Earth and Planetary Science Letters,2018-01-01,496