globalchange  > 气候变化与战略
DOI: 10.1038/s41561-021-00701-8
论文题名:
A coupled model of episodic warming, oxidation and geochemical transitions on early Mars
作者: Wordsworth R.; Knoll A.H.; Hurowitz J.; Baum M.; Ehlmann B.L.; Head J.W.; Steakley K.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2021
卷: 14, 期:3
起始页码: 127
结束页码: 132
语种: 英语
英文关键词: bolide ; carbon dioxide ; hydrogen ; Mars ; oxidation ; phyllosilicate ; remobilization ; sulfate
英文摘要: Reconciling the geology of Mars with models of atmospheric evolution remains a major challenge. Martian geology is characterized by past evidence for episodic surface liquid water, and geochemistry indicating a slow and intermittent transition from wetter to drier and more oxidizing surface conditions. Here we present a model that incorporates randomized injection of reducing greenhouse gases and oxidation due to hydrogen escape to investigate the conditions responsible for these diverse observations. We find that Mars could have transitioned repeatedly from reducing (hydrogen-rich) to oxidizing (oxygen-rich) atmospheric conditions in its early history. Our model predicts a generally cold early Mars, with mean annual temperatures below 240 K. If peak reducing-gas release rates and background carbon dioxide levels are high enough, it nonetheless exhibits episodic warm intervals sufficient to degrade crater walls, form valley networks and create other fluvial/lacustrine features. Our model also predicts transient build-up of atmospheric oxygen, which can help explain the occurrence of oxidized mineral species such as manganese oxides at Gale Crater. We suggest that the apparent Noachian–Hesperian transition from phyllosilicate deposition to sulfate deposition around 3.5 billion years ago can be explained as a combined outcome of increasing planetary oxidation, decreasing groundwater availability and a waning bolide impactor flux, which dramatically slowed the remobilization and thermochemical destruction of surface sulfates. Ultimately, rapid and repeated variations in Mars’s early climate and surface chemistry would have presented both challenges and opportunities for any emergent microbial life. © 2021, The Author(s), under exclusive licence to Springer Nature Limited.
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被引频次[WOS]:57   [查看WOS记录]     [查看WOS中相关记录]
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/169832
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作者单位: School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, United States; Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA, United States; Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, MA, United States; Department of Geosciences, Stony Brook University, Stony Brook, NY, United States; Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, United States; NASA Jet Propulsion Laboratory, Pasadena, CA, United States; Department of Earth, Environmental and Planetary Sciences, Brown University, Providence, RI, United States; NASA Ames Research Center, Mountain View, CA, United States

Recommended Citation:
Wordsworth R.,Knoll A.H.,Hurowitz J.,et al. A coupled model of episodic warming, oxidation and geochemical transitions on early Mars[J]. Nature Geoscience,2021-01-01,14(3)
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