气候变化领域集成服务门户(CCPortal): Mud flow levitation on Mars: Insights from laboratory simulations

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DOI	10.1016/j.epsl.2020.116406
	Mud flow levitation on Mars: Insights from laboratory simulations
	Brož P.; Krýza O.; Conway S.J.; Mueller N.T.; Hauber E.; Mazzini A.; Raack J.; Balme M.R.; Sylvest M.E.; Patel M.R.
发表日期	2020
ISSN	0012821X
卷号	545
英文摘要	Sediment mobilisation occurring at depth and ultimately manifesting at the surface, is a process which may have operated on Mars. However, the propagation behaviour of this mixture of water and sediments (hereafter simply referred to as mud) over the martian surface, remains uncertain. Although most of the martian surface is below freezing today, locally warmer surface temperatures do occur, and our current knowledge suggests that similar conditions prevailed in the recent past. Here, we present the results of experiments performed inside a low pressure chamber to investigate mud propagation over a warm (∼295 K) unconsolidated sand surface under martian atmospheric pressure conditions (∼7 mbar). Results show that the mud boils while flowing over the warm surface. The gas released during this process can displace the underlying sand particles and hence erode part of the substrate. This “entrenched” flow can act as a platform for further mud propagation over the surface. The escaping gas causes intermittent levitation of the mud resulting in enhanced flow rates. The mud flow morphologies produced by these phenomena differ from those produced when mud flows over a frozen martian surface as well as from their terrestrial counterparts. The intense boiling removes the latent heat both from the mud and the subsurface, meaning that the mud flow would eventually start to freeze and hence changing again the way it propagates. The diverse morphology expressed by our experimental mudflows implies that caution should be exercised when interpreting flow features on the surface of Mars and other celestial bodies. © 2020 Elsevier B.V.
关键词	analogue experiments levitation low pressure chamber Mars mud flow sedimentary volcanism
英文关键词	Atmospheric pressure; Celestial bodies; Flow features; Laboratory simulation; Martian surface; Sand particles; Surface of Mars; Surface temperatures; Unconsolidated sands; Morphology; atmospheric pressure; computer simulation; laboratory method; Mars; mudflow; surface temperature
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202514
作者单位	Institute of Geophysics of the Czech Academy of Sciences, Boční II/1401, Prague, 14131, Czech Republic; CNRS UMR-6112 Laboratoire de Planétologie et Géodynamique, Université de Nantes, France; Institute of Planetary Research, DLR, Rutherfordstr. 2, Berlin, 12489, Germany; Centre for Earth Evolution and Dynamics (CEED), University of Oslo, Norway; Institut für Planetologie, Westfälische Wilhelms-Universität, Münster, Germany; School of Physical Science, STEM, The Open University, Milton Keynes, United Kingdom; Space Science and Technology Department, STFC Rutherford Apple-ton Laboratory, Oxford, United Kingdom
推荐引用方式 GB/T 7714	Brož P.,Krýza O.,Conway S.J.,et al. Mud flow levitation on Mars: Insights from laboratory simulations[J],2020,545.
APA	Brož P..,Krýza O..,Conway S.J..,Mueller N.T..,Hauber E..,...&Patel M.R..(2020).Mud flow levitation on Mars: Insights from laboratory simulations.Earth and Planetary Science Letters,545.
MLA	Brož P.,et al."Mud flow levitation on Mars: Insights from laboratory simulations".Earth and Planetary Science Letters 545(2020).