globalchange  > 气候变化事实与影响
Scopus记录号: 2-s2.0-85062594509
论文题名:
Methane seasonal cycle at Gale Crater on Mars consistent with regolith adsorption and diffusion
作者: 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.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2019
语种: 英语
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.
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/122621
Appears in Collections:气候变化事实与影响

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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

Recommended Citation:
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]. Nature Geoscience,2019-01-01
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