气候变化领域集成服务门户(CCPortal): Methane seasonal cycle at Gale Crater on Mars consistent with regolith adsorption and diffusion

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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 J.E.; Gough R.V.; Martinez G.M.; Meslin P.-Y.; Smith C.L.; Atreya S.K.; Mahaffy P.R.; Newman C.E.; Webster C.R.
发表日期	2019
ISSN	17520894
卷号	12 期号:5
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 × 10−5 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. © 2019, The Author(s), under exclusive licence to Springer Nature Limited.
语种	英语
scopus关键词	adsorption; atmospheric transport; crater; diffusion; instrumentation; Mars; methane; mixing ratio; regolith; seasonal variation
来源期刊	Nature Geoscience
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/124682
作者单位	Centre for Research in Earth and Space Science, York University, Toronto, ON, Canada; University of Colorado, Boulder, CA, United States; University of Michigan, Ann Arbor, MI, United States; Université Paul Sabatier, Toulouse, France; NASA-Goddard, Greenbelt, MD, United States; Aeolis Research, Pasadena, CA, United States; Caltech-JPL, Pasadena, CA, United States
推荐引用方式 GB/T 7714	Moores J.E.,Gough R.V.,Martinez G.M.,et al. Methane seasonal cycle at Gale Crater on Mars consistent with regolith adsorption and diffusion[J],2019,12(5).
APA	Moores J.E..,Gough R.V..,Martinez G.M..,Meslin P.-Y..,Smith C.L..,...&Webster C.R..(2019).Methane seasonal cycle at Gale Crater on Mars consistent with regolith adsorption and diffusion.Nature Geoscience,12(5).
MLA	Moores J.E.,et al."Methane seasonal cycle at Gale Crater on Mars consistent with regolith adsorption and diffusion".Nature Geoscience 12.5(2019).