Cited by 93Paleontology and Stratigraphy of FossilsEarth Systems and Cosmic EvolutionGeology and Paleoclimatology Research

A theory of atmospheric oxygen

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Laakso, T. A., Schrag, D. P.·2017·Geobiology

Abstract

Abstract 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.

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Crossref · 10.1111/gbi.12230

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  • The mid-Proterozoic PO4 3- inventory was on the order of 5% of the present oceanic level.

    “In parallel, large-ensemble biogeochemical modeling (Ozaki et al. 2019) suggests a mid-Proterozoic PO 4 3-inventory on the order of 5% of the present oceanic level (Figure 6), consistent with results from low-order Earth system models (e.g., Laakso & Schrag 2017).”

    From The History of Ocean Oxygenation (2022) · cites this paper as Laakso & Schrag 2017

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Authors
Laakso, T. A., & Schrag, D. P.
Affiliations
Harvard University (US)
Corresponding author
Laakso, T. A.
Venue
Geobiology
Publisher
Wiley
Published
2017-04-05
Volume
15
Issue
3
Pages
366-384
ISSN
  • 1472-4669 (ISSN-L)
  • 1472-4677
OpenAlex
W2105639510
Cited by
93
References
87
Citations by year
2026: 7 · 2025: 4 · 2024: 7 · 2023: 6 · 2022: 7 · 2021: 10 · 2020: 14 · 2019: 15 · 2018: 15 · 2017: 6 · 2016: 1
FWCI
9.75
Type
journal article
Language
en
Open access
Locations
  • Geobiology (publishedVersion)
  • PubMed (publishedVersion)
  • Digital Access to Scholarship at Harvard (DASH) (Harvard University) (submittedVersion, cc-by)
Funders
National Aeronautics and Space Administration
Topics
  • Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Stratigraphy of Fossils
  • Physical Sciences › Earth and Planetary Sciences › Atmospheric Science › Earth Systems and Cosmic Evolution
  • Physical Sciences › Earth and Planetary Sciences › Atmospheric Science › Geology and Paleoclimatology Research
Keywords
atmospheric oxygen, Great Oxidation Event, Snowball Earth, atmospheric oxygenation, oxygenic photosynthesis, organic carbon cycling, biogeochemical cycles, positive and negative feedback, Archean, Proterozoic, Phanerozoic
MeSH terms
Atmosphere, Oxygen, Geological Phenomena

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