DOI: 10.1111/gbi.12230
Scopus记录号: 2-s2.0-85017399442
论文题名: A theory of atmospheric oxygen
作者: Laakso T.A. ; Schrag D.P.
刊名: Geobiology
ISSN: 1472-4677
EISSN: 1472-4669
出版年: 2017
卷: 15, 期: 3 起始页码: 366
结束页码: 384
语种: 英语
Scopus关键词: Archean
; atmospheric gas
; biogeochemical cycle
; biogeochemistry
; carbon cycle
; Earth
; geological record
; hydrogen
; iron
; oxygen
; paleoenvironment
; Phanerozoic
; phosphorus cycle
; photosynthesis
; Proterozoic
; sulfur cycle
; oxygen
; atmosphere
; chemistry
; geographic and geological phenomena
; Atmosphere
; Geological Phenomena
; Oxygen
Scopus学科分类: Earth and Planetary Sciences: General Earth and Planetary Sciences
; Environmental Science: General Environmental Science
; Agricultural and Biological Sciences: Ecology, Evolution, Behavior and Systematic
英文摘要: Geological records of atmospheric oxygen suggest that pO2 was less than 0.001% of present atmospheric levels (PAL) during the Archean, increasing abruptly to a Proterozoic value between 0.1% and 10% PAL, and rising quickly to modern levels in the Phanerozoic. Using a simple model of the biogeochemical cycles of carbon, oxygen, sulfur, hydrogen, iron, and phosphorous, we demonstrate that there are three stable states for atmospheric oxygen, roughly corresponding to levels observed in the geological record. These stable states arise from a series of specific positive and negative feedbacks, requiring a large geochemical perturbation to the redox state to transition from one to another. In particular, we show that a very low oxygen level in the Archean (i.e., 10−7 PAL) is consistent with the presence of oxygenic photosynthesis and a robust organic carbon cycle. We show that the Snowball Earth glaciations, which immediately precede both transitions, provide an appropriate transient increase in atmospheric oxygen to drive the atmosphere either from its Archean state to its Proterozoic state, or from its Proterozoic state to its Phanerozoic state. This hypothesis provides a mechanistic explanation for the apparent synchronicity of the Proterozoic Snowball Earth events with both the Great Oxidation Event, and the Neoproterozoic oxidation. © 2017 John Wiley & Sons Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/85060
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA, United States
Recommended Citation:
Laakso T.A.,Schrag D.P.. A theory of atmospheric oxygen[J]. Geobiology,2017-01-01,15(3)