Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1038/NGEO3033 |
Methane bursts as a trigger for intermittent lake-forming climates on post-Noachian Mars | |
Kite, Edwin S.1; Gao, Peter2,3; Goldblatt, Colin4; Mischna, Michael A.5; Mayer, David P.1,6; Yung, Yuk L.7 | |
2017-10-01 | |
发表期刊 | NATURE GEOSCIENCE
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ISSN | 1752-0894 |
EISSN | 1752-0908 |
出版年 | 2017 |
卷号 | 10期号:10 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; Canada |
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. |
领域 | 地球科学 ; 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000412102200009 |
WOS关键词 | GALE CRATER ; MARTIAN ATMOSPHERE ; SEDIMENTARY-ROCKS ; CLAY-MINERALS ; ANCIENT ; MODEL ; GREENHOUSE ; OBLIQUITY ; EVOLUTION ; OLIVINE |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/34888 |
专题 | 地球科学 气候变化 |
作者单位 | 1.Univ Chicago, Dept Geophys Sci, Chicago, IL 60637 USA; 2.NASA, Ames Res Ctr, Mountain View, CA 94035 USA; 3.Univ Calif Berkeley, Astron Dept, Berkeley, CA 94720 USA; 4.Univ Victoria, Sch Earth & Ocean Sci, Victoria, BC V8P 5C2, Canada; 5.Jet Prop Lab, Pasadena, CA 91109 USA; 6.US Geol Survey, Astrogeol Sci Ctr, Flagstaff, AZ 86001 USA; 7.CALTECH, Div Geol & Planetary Sci, Pasadena, CA 91125 USA |
推荐引用方式 GB/T 7714 | Kite, Edwin S.,Gao, Peter,Goldblatt, Colin,et al. Methane bursts as a trigger for intermittent lake-forming climates on post-Noachian Mars[J]. NATURE GEOSCIENCE,2017,10(10). |
APA | Kite, Edwin S.,Gao, Peter,Goldblatt, Colin,Mischna, Michael A.,Mayer, David P.,&Yung, Yuk L..(2017).Methane bursts as a trigger for intermittent lake-forming climates on post-Noachian Mars.NATURE GEOSCIENCE,10(10). |
MLA | Kite, Edwin S.,et al."Methane bursts as a trigger for intermittent lake-forming climates on post-Noachian Mars".NATURE GEOSCIENCE 10.10(2017). |
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