globalchange  > 气候减缓与适应
DOI: 10.1038/NGEO3033
论文题名:
Methane bursts as a trigger for intermittent lake-forming climates on post-Noachian Mars
作者: Kite E.S.; Gao P.; Goldblatt C.; Mischna M.A.; Mayer D.P.; Yung Y.L.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2017
卷: 10, 期:10
起始页码: 737
结束页码: 740
语种: 英语
Scopus关键词: clathrate ; climate ; fluviolacustrine deposit ; hydrothermal circulation ; lake ; Mars ; methane ; numerical model ; obliquity ; photochemistry ; temperature ; water-rock interaction ; watershed
英文摘要: Lakes existed on Mars later than 3.6 billion years ago, according to sedimentary evidence for deltaic deposition. The observed fluviolacustrine deposits suggest that individual lake-forming climates persisted for at least several thousand years (assuming dilute flow). But the lake watersheds' little-weathered soils indicate a largely dry climate history, with intermittent runoff events. Here we show that these observational constraints, although inconsistent with many previously proposed triggers for lake-forming climates, are consistent with a methane burst scenario. In this scenario, chaotic transitions in mean obliquity drive latitudinal shifts in temperature and ice loading that destabilize methane clathrate. Using numerical simulations, we find that outgassed methane can build up to atmospheric levels sufficient for lake-forming climates, if methane clathrate initially occupies more than 4% of the total volume in which it is thermodynamically stable. Such occupancy fractions are consistent with methane production by water-rock reactions due to hydrothermal circulation on early Mars. We further estimate that photochemical destruction of atmospheric methane curtails the duration of individual lake-forming climates to less than a million years, consistent with observations. We conclude that methane bursts represent a potential pathway for intermittent excursions to a warm, wet climate state on early Mars. © 2017 Macmillan Publishers Limited, part of Springer Nature. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105690
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 Geophysical Sciences, University of Chicago, Chicago, IL, United States; NASA Ames Research Center, Mountain View, CA, United States; Astronomy Department, University of California, Berkeley, CA, United States; School of Earth and Ocean Sciences, University of Victoria, Victoria, BC, United States; Jet Propulsion Laboratory, Pasadena, CA, United States; US Geological Survey, Astrogeology Science Center, Flagstaff, Arizona, United States; Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, United States

Recommended Citation:
Kite E.S.,Gao P.,Goldblatt C.,et al. Methane bursts as a trigger for intermittent lake-forming climates on post-Noachian Mars[J]. Nature Geoscience,2017-01-01,10(10)
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