Waterworlds May Have Better Climate Buffering Capacities than Their Continental Counterparts

被引:12
|
作者
Hayworth, Benjamin P. C. [1 ]
Foley, Bradford J. [1 ,2 ]
机构
[1] Penn State Univ, Dept Geosci, University Pk, PA 16802 USA
[2] Penn State Univ, Ctr Exoplanets & Habitable Worlds, University Pk, PA 16802 USA
关键词
Habitable planets; Exoplanets; Extrasolar rocky planets; Ocean planets; Carbon dioxide; ATMOSPHERIC CO2; REVISED MODEL; CARBON-CYCLE; FEEDBACK; WATER;
D O I
10.3847/2041-8213/abb882
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The long-term habitability of a planet is often assumed to be controlled by its ability to cycle carbon between the solid planetary interior and atmosphere. This process allows the planet to respond to external forcings (i.e., changes in insolation, changes in volcanic outgassing rates, etc.) and regulate its surface temperature through negative feedbacks on atmospheric CO(2)involved in silicate weathering. Continental weathering and seafloor weathering rates have different, non-linear dependencies on pCO(2)and will respond differently to changes in external forcings. Because waterworlds (planets with only seafloor weathering) have a weaker pCO(2)dependence than continental worlds (such as modern Earth), we find that waterworlds are better at resisting changes in surface temperature resulting from perturbations in insolation than their continental counterparts, and may be more habitable in this respect.
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页数:10
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