Carbon dioxide feedback on ocean planets

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Carbon dioxide feedback on ocean planets

Post by Lazarus on 8th July 2015, 4:43 pm

Kitzmann et al. "The unstable CO2 feedback cycle on ocean planets"
http://arxiv.org/abs/1507.01727

Clue's in the title: the carbon dioxide cycle on ocean planets, where carbon dioxide is removed from the atmosphere by dissolving into the ocean, is unstable: a cooler ocean is more able to dissolve carbon dioxide, thus removing a greenhouse gas from the atmosphere and tending towards runaway cooling, while a hotter ocean is less able to dissolve carbon dioxide and therefore tends to push conditions towards runaway greenhouse. Combined with the ice-albedo feedback it seems that the liquid water zone for ocean planets is much narrower than for terrestrial planets on which a silicate-carbonate cycle can operate.
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Re: Carbon dioxide feedback on ocean planets

Post by Lazarus on 29th September 2016, 4:00 pm

Maybe there is a possible negative feedback for carbon dioxide after all...

Levi, Sasselov & Podolak "The Abundance of Atmospheric CO2 in Ocean Exoplanets: A Novel CO2 Deposition Mechanism"
https://arxiv.org/abs/1609.08185
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