The carbonate-silicate cycle and CO2/climate feedbacks on tidally locked terrestrial planets

Adam R. Edson, James F. Kasting, David Pollard, Sukyoung Lee, Peter R. Bannon

Research output: Contribution to journalArticlepeer-review

39 Scopus citations

Abstract

Atmospheric gaseous constituents play an important role in determining the surface temperatures and habitability of a planet. Using a global climate model and a parameterization of the carbonate-silicate cycle, we explored the effect of the location of the substellar point on the atmospheric CO2 concentration and temperatures of a tidally locked terrestrial planet, using the present Earth continental distribution as an example. We found that the substellar point's location relative to the continents is an important factor in determining weathering and the equilibrium atmospheric CO2 level. Placing the substellar point over the Atlantic Ocean results in an atmospheric CO2 concentration of 7 ppmv and a global mean surface air temperature of 247 K, making ∼30% of the planet's surface habitable, whereas placing it over the Pacific Ocean results in a CO2 concentration of 60,311 ppmv and a global temperature of 282 K, making ∼55% of the surface habitable.

Original languageEnglish (US)
Pages (from-to)562-571
Number of pages10
JournalAstrobiology
Volume12
Issue number6
DOIs
StatePublished - Jun 1 2012

All Science Journal Classification (ASJC) codes

  • Agricultural and Biological Sciences (miscellaneous)
  • Space and Planetary Science

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