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- W3122389276 endingPage "24" @default.
- W3122389276 startingPage "24" @default.
- W3122389276 abstract "We consider super-Earth sized planets which have a water mass fraction large enough to form an external mantle composed of high-pressure water-ice polymorphs and also lack a substantial H/He atmosphere. We consider such planets in their habitable zone, so that their outermost condensed mantle is a global, deep, liquid ocean. For these ocean planets, we investigate potential internal reservoirs of CO2, the amount of CO2 dissolved in the ocean for the various saturation conditions encountered, and the ocean-atmosphere exchange flux of CO2. We find that, in a steady state, the abundance of CO2 in the atmosphere has two possible states. When wind-driven circulation is the dominant CO2 exchange mechanism, an atmosphere of tens of bars of CO2 results, where the exact value depends on the subtropical ocean surface temperature and the deep ocean temperature. When sea-ice formation, acting on these planets as a CO2 deposition mechanism, is the dominant exchange mechanism, an atmosphere of a few bars of CO2 is established. The exact value depends on the subpolar surface temperature. Our results suggest the possibility of a negative feedback mechanism, unique to water planets, where a reduction in the subpolar temperature drives more CO2 into the atmosphere to increase the greenhouse effect." @default.
- W3122389276 created "2021-02-01" @default.
- W3122389276 creator A5022129586 @default.
- W3122389276 creator A5030060477 @default.
- W3122389276 creator A5047192495 @default.
- W3122389276 date "2017-03-21" @default.
- W3122389276 modified "2023-09-27" @default.
- W3122389276 title "The Abundance of Atmospheric CO<sub>2</sub>in Ocean Exoplanets: a Novel CO<sub>2</sub>Deposition Mechanism" @default.
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