Constraining the climate and ocean pH of the early Earth with a geological carbon cycle model
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- Joshua Krissansen-Totton
- Department of Earth and Space Sciences, University of Washington, Seattle, WA 98195;
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- Giada N. Arney
- Virtual Planetary Laboratory Team, NASA Astrobiology Institute, Seattle, WA 98195;
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- David C. Catling
- Department of Earth and Space Sciences, University of Washington, Seattle, WA 98195;
書誌事項
- 公開日
- 2018-04-02
- 権利情報
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- https://creativecommons.org/licenses/by-nc-nd/4.0/
- DOI
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- 10.1073/pnas.1721296115
- 公開者
- Proceedings of the National Academy of Sciences
この論文をさがす
説明
<jats:title>Significance</jats:title><jats:p>The climate and ocean pH of the early Earth are important for understanding the origin and early evolution of life. However, estimates of early climate range from below freezing to over 70 °C, and ocean pH estimates span from strongly acidic to alkaline. To better constrain environmental conditions, we applied a self-consistent geological carbon cycle model to the last 4 billion years. The model predicts a temperate (0–50 °C) climate and circumneutral ocean pH throughout the Precambrian due to stabilizing feedbacks from continental and seafloor weathering. These environmental conditions under which life emerged and diversified were akin to the modern Earth. Similar stabilizing feedbacks on climate and ocean pH may operate on earthlike exoplanets, implying life elsewhere could emerge in comparable environments.</jats:p>
収録刊行物
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- Proceedings of the National Academy of Sciences
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Proceedings of the National Academy of Sciences 115 (16), 4105-4110, 2018-04-02
Proceedings of the National Academy of Sciences