Cited by 17Origins and Evolution of LifePaleontology and Stratigraphy of FossilsAstro and Planetary Science

Atmospheric nitrogen when life evolved on Earth

Gebauer, Stefanie, Grenfell, John Lee, Lammer, Helmut, de Vera, Jean-Pierre Paul, Sproß, Laurenz, Airapetian, Vladimir S., Sinnhuber, Miriam, Rauer, Heike·2020·Astrobiology

Abstract

The amount of nitrogen (N 2 ) present in the atmosphere when life evolved on our planet is central for understanding the production of prebiotic molecules and, hence, is a fundamental quantity to constrain. Estimates of atmospheric molecular nitrogen partial surface pressures during the Archean, however, widely vary in the literature. In this study, we apply a model that combines newly gained insights into atmospheric escape, magma ocean duration, and outgassing evolution. Results suggest <420 mbar surface molecular nitrogen at the time when life originated, which is much lower compared with estimates in previous works and hence could impact our understanding of the production rate of prebiotic molecules such as hydrogen cyanide. Our revised values provide new input for atmospheric chamber experiments that simulate prebiotic chemistry on the early Earth. Our results that assume negligible nitrogen escape rates are in agreement with research based on solidified gas bubbles and the oxidation of iron in micrometeorites at 2.7 Gyr ago, which suggest that the atmospheric pressure was probably less than half the present-day value. Our results contradict previous studies that assume N 2 partial surface pressures during the Archean were higher than those observed today and suggest that, if the N 2 partial pressure were low in the Archean, it would likely be low in the Hadean as well. Furthermore, our results imply a biogenic nitrogen fixation rate from 9 to 14 Teragram N 2 per year (Tg N 2 /year), which is consistent with modern marine biofixation rates and, hence, indicate an oceanic origin of this fixation process.

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Crossref · 10.1089/ast.2019.2212

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Authors
Gebauer, S., Grenfell, J. L., Lammer, H., de Vera, J.-P. P., Sproß, L., Airapetian, V. S., Sinnhuber, M., & Rauer, H.
Affiliations
  • Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR) (DE)
  • Austrian Academy of Sciences (AT)
  • Institute for Planetary Research (PF), German Aerospace Centre (DLR), Berlin, Germany.
  • Goddard Space Flight Center (US)
  • Karlsruhe Institute of Technology (DE)
Corresponding author
Gebauer, Stefanie
Venue
Astrobiology
Published
2020-12
Volume
20
Issue
12
Pages
1413-1426
ISSN
  • 1531-1074 (ISSN-L)
  • 1557-8070
OpenAlex
W3097152008
Cited by
17
References
105
Citations by year
2026: 1 · 2025: 1 · 2024: 2 · 2023: 5 · 2022: 3 · 2021: 3 · 2020: 1 · 2019: 1
FWCI
1.34
Type
journal article
Language
en
Open access
closed
Locations
  • Astrobiology (publishedVersion)
  • PubMed (publishedVersion)
  • elib (German Aerospace Center) (submittedVersion)
Topics
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Origins and Evolution of Life
  • Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Stratigraphy of Fossils
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astro and Planetary Science
Keywords
atmospheric nitrogen, Archean atmosphere, early Earth, prebiotic chemistry, hydrogen cyanide, atmospheric escape, magma ocean, outgassing, atmospheric pressure, micrometeorites
MeSH terms
Origin of Life, Atmosphere, Nitrogen, Oxidation-Reduction, Earth, Planet

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