DOI: 10.1029/2018JG004416
Scopus记录号: 2-s2.0-85052403611
论文题名: Making Sense of Massive Carbon Isotope Excursions With an Inverse Carbon Cycle Model
作者: Miyazaki Y. ; Planavsky N.J. ; Bolton E.W. ; Reinhard C.T.
刊名: Journal of Geophysical Research: Biogeosciences
ISSN: 21698953
出版年: 2018
卷: 123, 期: 8 起始页码: 2485
结束页码: 2496
语种: 英语
英文摘要: The beginning and end of the Proterozoic Eon are marked by extreme variations in carbonate carbon isotope values that have been interpreted to record massive perturbations to the global carbon cycle. The lower Proterozoic contains an extended interval of strata characterized by positive carbonate δ13C values. Conversely, uppermost Proterozoic carbonate strata contain thick intervals with extremely negative δ13C values and multiple large swings in carbonate δ13C. Previous attempts to model these pronounced carbon isotope excursions as shifts in the global marine dissolved inorganic carbon (DIC) reservoir have proved to be problematic, as the direction and magnitude of these positive and negative carbon isotope excursions require unrealistic amounts of either organic carbon burial or organic carbon oxidation, respectively. Here we present a modified global carbon cycle model—coupled with oxygen and sulfur cycle mass balances—that includes a parameterization of the recycling of sedimentary isotope anomalies and allows the extent of organic carbon oxidation to vary as a function of atmospheric oxygen levels. Our model is designed to match carbon isotope records while maintaining redox and mass balance with a given set of initial conditions and carbon cycle parameterizations. Using this approach, we demonstrate that there is a range of plausible biogeochemical perturbations that could induce substantial δ13C excursions in the global marine DIC reservoir. However, we also find that there are multiple, nonunique Earth system states for any observed marine δ13C value. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113462
Appears in Collections: 气候减缓与适应
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作者单位: Department of Geology and Geophysics, Yale University, New Haven, CT, United States; School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA, United States
Recommended Citation:
Miyazaki Y.,Planavsky N.J.,Bolton E.W.,et al. Making Sense of Massive Carbon Isotope Excursions With an Inverse Carbon Cycle Model[J]. Journal of Geophysical Research: Biogeosciences,2018-01-01,123(8)