气候变化领域集成服务门户(CCPortal): A largely invariant marine dissolved organic carbon reservoir across Earth’s history

CCPortal

DOI	10.1073/pnas.2103511118
	A largely invariant marine dissolved organic carbon reservoir across Earth’s history
	Fakhraee M.; Tarhan L.G.; Planavsky N.J.; Reinhard C.T.
发表日期	2021
ISSN	0027-8424
卷号	118 期号:40
英文摘要	Marine dissolved organic carbon (DOC), the largest pool of reduced carbon in the oceans, plays an important role in the global carbon cycle and contributes to the regulation of atmospheric oxygen and carbon dioxide abundances. Despite its importance in global biogeochemical cycles, the long-term history of the marine DOC reservoir is poorly constrained. Nonetheless, significant changes to the size of the oceanic DOC reservoir through Earth’s history have been commonly invoked to explain changes to ocean chemistry, carbon cycling, and marine ecology. Here, we present a revised view of the evolution of marine DOC concentrations using a mechanistic carbon cycle model that can reproduce DOC concentrations in both oxic and anoxic modern environments. We use this model to demonstrate that the overall size of the marine DOC reservoir has likely undergone very little variation through Earth’s history, despite major changes in the redox state of the ocean–atmosphere system and the nature and efficiency of the biological carbon pump. A relatively static marine DOC reservoir across Earth’s history renders it unlikely that major changes in marine DOC concentrations have been responsible for driving massive repartitioning of surface carbon or the large carbon isotope excursions observed in Earth’s stratigraphic record and casts doubt on previously hypothesized links between marine DOC levels and the emergence and radiation of early animals. © 2021 National Academy of Sciences. All rights reserved.
英文关键词	Dissolved organic carbon; Ediacara biota; Marine carbon cycle; Precambrian
语种	英语
scopus关键词	dissolved organic carbon; organic carbon; unclassified drug; Article; biomass; concentration (parameter); degradation; environmental factor; marine environment; oxidation reduction state; surface property
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/238358
作者单位	School of Earth and Atmospheric Sciences, Georgia Tech, Atlanta, GA 30318, United States; Alternative Earths Team, NASA Interdisciplinary Consortia for Astrobiology Research, Riverside, CA 92521, United States; Department of Earth and Planetary Sciences, Yale University, New Haven, CT 06511, United States
推荐引用方式 GB/T 7714	Fakhraee M.,Tarhan L.G.,Planavsky N.J.,等. A largely invariant marine dissolved organic carbon reservoir across Earth’s history[J],2021,118(40).
APA	Fakhraee M.,Tarhan L.G.,Planavsky N.J.,&Reinhard C.T..(2021).A largely invariant marine dissolved organic carbon reservoir across Earth’s history.Proceedings of the National Academy of Sciences of the United States of America,118(40).
MLA	Fakhraee M.,et al."A largely invariant marine dissolved organic carbon reservoir across Earth’s history".Proceedings of the National Academy of Sciences of the United States of America 118.40(2021).