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DOI | 10.1038/s41561-019-0313-y |
Methane seasonal cycle at Gale Crater on Mars consistent with regolith adsorption and diffusion | |
Moores, John E.1; Gough, Raina, V2; Martinez, German M.3; Meslin, Pierre-Yves4; Smith, Christina L.1; Atreya, Sushi K.3; Mahaffy, Paul R.5; Newman, Claire E.6; Webster, Christopher R.7 | |
2019-05-01 | |
发表期刊 | NATURE GEOSCIENCE |
ISSN | 1752-0894 |
EISSN | 1752-0908 |
出版年 | 2019 |
卷号 | 12期号:5页码:321-+ |
文章类型 | Article |
语种 | 英语 |
国家 | Canada; USA; France |
英文摘要 | A strong, repeatable seasonal cycle in the background methane mixing ratio has been observed at the Gale Crater landing site of the Mars Science Laboratory rover with the Tunable Laser Spectrometer of the Sample Analysis at Mars instrument. However, as of yet, no physical process has been proposed that can explain both the timing and amplitude of the observations. Here we show that a one-dimensional numerical model considering adsorption onto and diffusion through the regolith can reproduce the variation, including a phase lag, if the regolith is impregnated with methane from a prior plume or supplied from below by microseepage. Combining the model results with geological constraints, we estimate that the amount of microseepage at Gale is at most 3 x10(-5)tonnes km(-2) yr(-1). Gale's unique dynamical environment makes such seeps easier to detect in surface sampling measurements. Over most of the Martian surface, atmospheric mixing is stronger or atmospheric transport more effective, and we expect the amplitude of the seasonal cycle to be smaller for the same strength of seep. |
领域 | 地球科学 ; 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000467814100005 |
WOS关键词 | MARTIAN ATMOSPHERE ; ROVER ; REMS ; RELEASE ; SURFACE ; NAVCAM ; LAYER ; LIFE |
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/183083 |
专题 | 地球科学 气候变化 |
作者单位 | 1.York Univ, Ctr Res Earth & Space Sci, Toronto, ON, Canada; 2.Univ Colorado, Boulder Creek, CA USA; 3.Univ Michigan, Ann Arbor, MI 48109 USA; 4.Univ Paul Sabatier, Toulouse, France; 5.NASA Goddard, Greenbelt, MD USA; 6.Aeolis Res, Pasadena, CA USA; 7.Caltech JPL, Pasadena, CA USA |
推荐引用方式 GB/T 7714 | Moores, John E.,Gough, Raina, V,Martinez, German M.,et al. Methane seasonal cycle at Gale Crater on Mars consistent with regolith adsorption and diffusion[J]. NATURE GEOSCIENCE,2019,12(5):321-+. |
APA | Moores, John E..,Gough, Raina, V.,Martinez, German M..,Meslin, Pierre-Yves.,Smith, Christina L..,...&Webster, Christopher R..(2019).Methane seasonal cycle at Gale Crater on Mars consistent with regolith adsorption and diffusion.NATURE GEOSCIENCE,12(5),321-+. |
MLA | Moores, John E.,et al."Methane seasonal cycle at Gale Crater on Mars consistent with regolith adsorption and diffusion".NATURE GEOSCIENCE 12.5(2019):321-+. |
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