globalchange  > 气候减缓与适应
DOI: 10.1038/ngeo2000
论文题名:
Warming early Mars with CO2 and H2
作者: Ramirez R.M.; Kopparapu R.; Zugger M.E.; Robinson T.D.; Freedman R.; Kasting J.F.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2014
卷: 7, 期:1
起始页码: 59
结束页码: 63
语种: 英语
英文摘要: The presence of valleys on ancient terrains of Mars suggests that liquid water flowed on the martian surface 3.8 Gyr ago or before. The above-freezing temperatures required to explain valley formation could have been transient, in response to the frequent large meteorite impacts on early Mars, or they could have been caused by long-lived greenhouse warming. Climate models that consider only the greenhouse gases carbon dioxide and water have been unable to recreate warm surface conditions, given the lower solar luminosity at that time. Here we use a one-dimensional climate model to demonstrate that an atmosphere containing 1.3-4 bar of CO2 and water, in addition to 5-20% H2, could have raised the mean surface temperature of early Mars above the freezing point of water. Vigorous volcanic outgassing from a highly reduced early martian mantle is expected to provide sufficient atmospheric H2 and CO 2-the latter from the photochemical oxidation of outgassed CH 4 and CO-to form a CO2 and H2 greenhouse. Such a dense early martian atmosphere is consistent with independent estimates of surface pressure based on cratering data. © 2014 Macmillan Publishers Limited.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106425
Appears in Collections:气候减缓与适应
科学计划与规划

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作者单位: Department of Geosciences, Penn State University, University Park, PA, 16802, United States; Penn State Astrobiology Research Center, Penn State University, University Park, PA, 16802, United States; NASA, Astrobiology Institute Virtual Planetary Laboratory, University of Washington, Seattle WA 98195, United States; Applied Research Laboratory, Penn State University, University Park, PA, 16802, United States; Astronomy Department, University OfWashington, WA, 98195, United States; SETI Institute, Mountain View, CA, 94043, United States; NASA, Ames Research Center, Moffett Field, CA, 94035, United States

Recommended Citation:
Ramirez R.M.,Kopparapu R.,Zugger M.E.,et al. Warming early Mars with CO2 and H2[J]. Nature Geoscience,2014-01-01,7(1)
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