Cited by 709Astro and Planetary SciencePlanetary Science and ExplorationStellar, planetary, and galactic studies

Runaway and moist greenhouse atmospheres and the evolution of Earth and Venus

Kasting, James F.·1988·Icarus

Abstract

A one-dimensional climate model is used to study the response of an Earth-like atmosphere to large increases in solar flux. For fully saturated, cloud-free conditions, the critical solar flux at which a runaway greenhouse occurs, that is, the oceans evaporate entirely, is found to be 1.4 times the present flux at Earth's orbit (S0). This value is close to the flux expected at Venus' orbit early in solar system history. Is is nearly independent of the amount of CO2 present in the atmosphere, but is sensitive to the H2O absorption coefficient in the 8- to 12-micrometers window region. Clouds should tend to depress the surface temperature on a warm, moist planet; thus, Venus may originally have had oceans if its initial water endowment was close to that of Earth. It lost them early in its history, however, because of rapid photodissociation of water vapor followed by escape of hydrogen to space. The critical solar flux above which water is rapidly lost could be as low as 1.1S0. The surface temperature of a runaway greenhouse atmosphere containing a full ocean's worth of water would have been in excess of 1500 degrees K--above the solidus for silicate rocks. The presence of such a steam atmosphere during accretion may have significantly influenced the early thermal evolution of both Earth and Venus.

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Crossref · 10.1016/0019-1035(88)90116-9

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  • A planet on the inner edge of the habitable zone could conceivably have a large abiotic buildup of oxygen through a runaway greenhouse effect while the oceans evaporate; after photodissociation of water in the atmosphere, hydrogen could escape, leaving oxygen behind.

    “A planet on the inner edge of the habitable zone (see Chapter 5) could conceivably have a large abiotic buildup of oxygen through a runaway greenhouse effect while the oceans evaporate; after photodissociation of water in the atmosphere, hydrogen could escape, leaving oxygen behind (Kasting, 1988).”

    From The Astrobiology Primer v2.0 (2016) · cites this paper as Kasting, 1988

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Authors
Kasting, J. F.
Affiliations
Ames Research Center (US)
Corresponding author
Kasting, James F.
Venue
Icarus
Publisher
Elsevier BV
Published
1988-06
Volume
74
Issue
3
Pages
472-494
ISSN
0019-1035 (ISSN-L)
OpenAlex
W1968152463
Cited by
709
References
47
Citations by year
2026: 21 · 2025: 30 · 2024: 33 · 2023: 39 · 2022: 31 · 2021: 35 · 2020: 37 · 2019: 30 · 2018: 37 · 2017: 32 · 2016: 36 · 2015: 33 · 2014: 30 · 2013: 40 · 2012: 19
FWCI
12.62
Type
journal article
Language
en
Open access
closed
Locations
  • Icarus (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astro and Planetary Science
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Planetary Science and Exploration
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Stellar, planetary, and galactic studies
Keywords
runaway greenhouse, Venus, Earth, water photodissociation, hydrogen escape, water vapor absorption, accretion, steam atmosphere, carbon dioxide, one-dimensional climate model
MeSH terms
Atmosphere, Carbon Dioxide, Climate, Light, Models, Theoretical, Scattering, Radiation, Sunlight, Temperature, Water, Solar System, Greenhouse Effect, Earth, Planet, Venus

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