Carbon Cycle and Long-Term Evolution of Climate for a Globally Ocean-Covered Planet

Details Carbon Cycle and Long-Term Evolution of Climate for a Globally Ocean-Covered Planet Carbon Cycle and Long-Term Evolution of Climate for a Globally Ocean-Covered Planet

Sep 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011ess.....2.4203g&link_type=abstract

American Astronomical Society, ESS meeting #2, #42.03

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Carbon cycle is important for considering the long-term stability of climate of a planet. For the Earth, as the surface temperature rises, continental weathering is enhanced, which causes consumption of atmospheric CO2 and then results in decrease of the surface temperature. This negative feedback called Walker feedback works on a planet with plate techtonics and continents, and stabilizes its climate over the long term.
There may be wide variety of the amount of the ocean on extrasolar terrestrial planets. If the amount of water on the Earth increased by five times, the Earth’s surface would be completely covered by the ocean. Since the mass of the ocean on the present Earth is tiny (0.023wt%) compared to the Earth’s mass, a lot of exoplanets with globally covered ocean will be found.
According to the preliminary carbon cycle model, the surface temperature of the planet with very small fraction of continental area (1%) is maintained to be much higher (about 80 degrees Celsius) than that of the Earth, because surface weathering is suppressed and effective burial of carbonate does not work. In order to consider a globally ocean-covered planet, we further develop a carbon cycle model with weathering of oceanic crust in the hydrothermal system and thermal evolution of the planet. We discuss the long-term stability and habitability of the globally ocean-covered planet with various sizes from mini Earths to super Earths.

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