Publication Abstracts

Höning et al. 2021, accepted

Höning, D., P. Baumeister, J.L. Grenfell, N. Tosi, and M.J. Way, 2021: Early habitability and crustal decarbonation of a stagnant-lid Venus. J. Geophys. Res. Planets, accepted.

Little is known about the early evolution of Venus and a potential habitable period during its first one billion years, with a key uncertainty on whether or not plate tectonics and an active carbonate-silicate cycle were present. In the presence of liquid water on the surface but without plate tectonics, weathering would have been limited to freshly produced basaltic crust, with an early carbon cycle restricted to the crust and atmosphere. With the evaporation of surface water, weathering would cease. With ongoing volcanism, carbonate sediments would be buried and sink downwards. Thereby, carbonates would heat up until they become unstable and the crust would become depleted in carbonates. With CO2 supply to the atmosphere the surface temperature rises further, the depth below which decarbonation occurs decreases, causing the release of even more CO2.

In order to assess the habitable period of an early stagnant-lid Venus, we employ a coupled interior-atmosphere evolution model accounting for CO2 degassing, seafloor weath- ering, carbonate burial, and crustal decarbonation. We find habitable conditions throughout the first 900 Myr of Venus' evolution, followed by evaporation of water and rapid depletion of the crust in carbonates. For the atmospheric CO2 of stagnant-lid exoplanets, we predict a bimodal distribution, depending on whether or not these planets experienced a runaway greenhouse in their history. Planets with high atmospheric CO2 could be associated with crustal depletion of carbonates as a consequence of a runaway greenhouse, whereas planets with low atmospheric CO2 would indicate active silicate weathering and thereby a habitable climate.

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BibTeX Citation

@unpublished{ho00800c,
  author={Höning, D. and Baumeister, P. and Grenfell, J. L. and Tosi, N. and Way, M. J.},
  title={Early habitability and crustal decarbonation of a stagnant-lid Venus},
  year={2021},
  journal={J. Geophys. Res. Planets},
}

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RIS Citation

TY  - INPR
ID  - ho00800c
AU  - Höning, D.
AU  - Baumeister, P.
AU  - Grenfell, J. L.
AU  - Tosi, N.
AU  - Way, M. J.
PY  - 2021
TI  - Early habitability and crustal decarbonation of a stagnant-lid Venus
JA  - J. Geophys. Res. Planets
ER  -

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