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Climate of Extraterrestrial Planets with Oceans and Carbonate-Silicate Geochemical Cycle Under Various Obliquities

Published online by Cambridge University Press:  29 April 2014

Yoshiyasu Watanabe ,
Eiichi Tajika  and
Shintaro Kadoya
Yoshiyasu Watanabe
Affiliation:
Dept. of Earth and Planetary Science, The University of Tokyo, Tokyo 113-0033, Japan email: y-watanabe@astrobio.k.u-tokyo.ac.jp
Eiichi Tajika
Affiliation:
Dept. of Earth and Planetary Science, The University of Tokyo, Tokyo 113-0033, Japan email: y-watanabe@astrobio.k.u-tokyo.ac.jp Dept. of Complexity Science and Engineering, The University of Tokyo, Chiba 277-8561, Japan email: tajika@astrobio.k.u-tokyo.ac.jp
Shintaro Kadoya
Affiliation:
Dept. of Earth and Planetary Science, The University of Tokyo, Tokyo 113-0033, Japan email: y-watanabe@astrobio.k.u-tokyo.ac.jp
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Abstract

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We systematically investigated the climate of water-rich terrestrial planets with a negative feedback mechanism of carbonate-silicate geochemical cycle against the climate under various obliquities and semi-major axes. We found that, while the permanent ice-cap mode (partially ice-covered throughout the year) and the seasonal ice-cap mode (partially ice-covered seasonally) exist stably at low obliquity conditions, the ranges of semi-major axis for these climate modes shrink and finally disappear with an increase of obliquity. When carbonate-silicate geochemical cycle is taken into account, the ranges of semi-major axis for all the climate modes expand at any obliquities, compared with the cases without carbonate-silicate geochemical cycle, indicating that the carbonate-silicate geochemical cycle strongly stabilizes the climate for the planets with any obliquities inside the habitable zone.

Keywords

astrobiologyplanets and satellites: generalEarth
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S293: Formation, Detection, and Characterization of Extrasolar Habitable Planets , August 2012 , pp. 333 - 335
Copyright
Copyright © International Astronomical Union 2014 

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