Cited by 507Paleontology and Stratigraphy of FossilsOrigins and Evolution of LifeEarth Systems and Cosmic Evolution

Biogenic Methane, Hydrogen Escape, and the Irreversible Oxidation of Early Earth

Catling, David C., Zahnle, Kevin J., McKay, Christopher P.·2001·Science

Abstract

The low O 2 content of the Archean atmosphere implies that methane should have been present at levels ∼10 2 to 10 3 parts per million volume (ppmv) (compared with 1.7 ppmv today) given a plausible biogenic source. CH 4 is favored as the greenhouse gas that countered the lower luminosity of the early Sun. But abundant CH 4 implies that hydrogen escapes to space (↑space) orders of magnitude faster than today. Such reductant loss oxidizes the Earth. Photosynthesis splits water into O 2 and H, and methanogenesis transfers the H into CH 4 . Hydrogen escape after CH 4 photolysis, therefore, causes a net gain of oxygen [CO 2 + 2H 2 O → CH 4 + 2O 2 → CO 2 + O 2 + 4H(↑space)]. Expected irreversible oxidation (∼10 12 to 10 13 moles oxygen per year) may help explain how Earth's surface environment became irreversibly oxidized.

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Crossref · 10.1126/science.1061976

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39 of 39 references verified0 citation errors · 0 not checkable

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  • This hydrogen was likely derived from UV photolysis of CH4 in the upper atmosphere.

    “This hydrogen was likely derived from UV photolysis of CH4 in the upper atmosphere (135).”

    From The Archean atmosphere (2020) · cites this paper as [135]

  • Some emphasize the role of hydrogen escape to space in oxidizing solid Earth, lowering Earth's capacity to release O2-consuming reductants.

    “Some emphasize the role of hydrogen escape to space in oxidizing solid Earth, lowering Earth’s capacity to release O2-consuming reductants (121, 135, 136).”

    From The Archean atmosphere (2020) · cites this paper as [135]

  • Anoxic Archean air could hold 1000s of ppmv of CH4 if a microbial flux of CH4 was comparable to today's.

    “Anoxic Archean air could hold 1000 s of parts per million by volume of CH4 if a microbial flux of CH4 was comparable to today’s (135, 183, 184).”

    From The Archean atmosphere (2020) · cites this paper as [135]

  • Assuming crust oxidation (resulting in a present Fe3+ excess of ≈2 × 1021 mol O2 eq) is linked to continental growth, an 'episodic continental growth' model with rapid growth from 10 to 80% of present area 3.2-2.5 Ga would imply a net oxidation rate of ≈2 × 1012 mol O2 eq yr−1.

    “For example, assuming crust oxidation (resulting in a present Fe3+ excess54 of ≈2 × 1021 mol O2 eq) is linked to continental growth, an ‘episodic continental growth' model55 with rapid growth from 10 to 80% of present area 3.2–2.5 Ga would imply a net oxidation rate of ≈2 × 1012 mol O2 eq yr−1 (balanced by a combination of hydrogen escape and organic carbon accumulation).”
  • There are 3.7 × 1019 mol O2 in the atmosphere and oceans, 5.1 × 1020 mol O2 equivalent Fe3+ and sulfate in sedimentary rocks, and ~2 × 1021 mol O2 equivalent excess Fe3+ in igneous and metamorphic rocks.

    “Although there are 3.7 × 1019 mol O2 in the atmosphere and oceans, there are 5.1 × 1020 mol O2 equivalent Fe3+ and sulfate in sedimentary rocks, and ~2 × 1021 mol O2 equivalent excess Fe3+ in igneous and metamorphic rocks (68).”

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Authors
Catling, D. C., Zahnle, K. J., & McKay, C. P.
Affiliations
Ames Research Center (US)
Corresponding author
Catling, David C.
Venue
Science
Published
2001-08-03
Volume
293
Issue
5531
Pages
839-843
ISSN
  • 0036-8075 (ISSN-L)
  • 1095-9203
OpenAlex
W1972615373
Cited by
507
References
39
Citations by year
2026: 18 · 2025: 20 · 2024: 24 · 2023: 13 · 2022: 25 · 2021: 28 · 2020: 33 · 2019: 21 · 2018: 26 · 2017: 18 · 2016: 14 · 2015: 15 · 2014: 10 · 2013: 26 · 2012: 18
FWCI
17.72
Type
journal article
Language
en
Open access
closed
Locations
  • Science (publishedVersion)
  • PubMed (publishedVersion)
  • Bristol Research (University of Bristol) (publishedVersion)
  • Explore Bristol Research (submittedVersion)
Topics
  • Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Stratigraphy of Fossils
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Origins and Evolution of Life
  • Physical Sciences › Earth and Planetary Sciences › Atmospheric Science › Earth Systems and Cosmic Evolution
Keywords
biogenic methane, hydrogen escape, Archean atmosphere, methanogenesis, greenhouse effect, photosynthesis
MeSH terms
Atmosphere, Bacteria, Carbon Dioxide, Climate, Hydrogen, Iron, Methane, Oxidation-Reduction, Oxygen, Photosynthesis, Sulfur, Earth, Planet, Geologic Sediments, Evolution, Planetary, Euryarchaeota

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