气候变化领域集成服务门户(CCPortal): A sluggish mid-Proterozoic biosphere and its effect on Earth's redox balance

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DOI	10.1111/gbi.12317
	A sluggish mid-Proterozoic biosphere and its effect on Earth's redox balance
	Ozaki K.; Reinhard C.T.; Tajika E.
发表日期	2019
ISSN	14724677
起始页码	3
结束页码	11
卷号	17 期号:1
英文摘要	The possibility of low but nontrivial atmospheric oxygen (O 2 ) levels during the mid-Proterozoic (between 1.8 and 0.8 billion years ago, Ga) has important ramifications for understanding Earth's O 2 cycle, the evolution of complex life and evolving climate stability. However, the regulatory mechanisms and redox fluxes required to stabilize these O 2 levels in the face of continued biological oxygen production remain uncertain. Here, we develop a biogeochemical model of the C-N-P-O 2 -S cycles and use it to constrain global redox balance in the mid-Proterozoic ocean–atmosphere system. By employing a Monte Carlo approach bounded by observations from the geologic record, we infer that the rate of net biospheric O 2 production was 3.5 -1.1 +1.4 Tmol year −1 (1σ), or ~25% of today's value, owing largely to phosphorus scarcity in the ocean interior. Pyrite burial in marine sediments would have represented a comparable or more significant O 2 source than organic carbon burial, implying a potentially important role for Earth's sulphur cycle in balancing the oxygen cycle and regulating atmospheric O 2 levels. Our statistical approach provides a uniquely comprehensive view of Earth system biogeochemistry and global O 2 cycling during mid-Proterozoic time and implicates severe P biolimitation as the backdrop for Precambrian geochemical and biological evolution. © 2018 The Authors. Geobiology Published by John Wiley & Sons Ltd
关键词	biogeochemical cycle biogeochemistry biosphere Monte Carlo analysis Precambrian redox conditions sea water astronomy atmosphere biodiversity chemistry oxidation reduction reaction sea theoretical model Atmosphere Biodiversity Earth (Planet)Evolution, Planetary Models, Theoretical Oceans and Seas Oxidation-Reduction Seawater
语种	英语
来源机构	Geobiology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/133254
推荐引用方式 GB/T 7714	Ozaki K.,Reinhard C.T.,Tajika E.. A sluggish mid-Proterozoic biosphere and its effect on Earth's redox balance[J]. Geobiology,2019,17(1).
APA	Ozaki K.,Reinhard C.T.,&Tajika E..(2019).A sluggish mid-Proterozoic biosphere and its effect on Earth's redox balance.,17(1).
MLA	Ozaki K.,et al."A sluggish mid-Proterozoic biosphere and its effect on Earth's redox balance".17.1(2019).