气候变化领域集成服务门户(CCPortal): Valley formation on early Mars by subglacial and fluvial erosion

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DOI	10.1038/s41561-020-0618-x
	Valley formation on early Mars by subglacial and fluvial erosion
	Grau Galofre A.; Jellinek A.M.; Osinski G.R.
发表日期	2020
ISSN	17520894
起始页码	663
结束页码	668
卷号	13 期号:10
英文摘要	The southern highlands of Mars are dissected by hundreds of valley networks, which are evidence that water once sculpted the surface. Characterizing the mechanisms of valley incision may constrain early Mars climate and the search for ancient life. Previous interpretations of the geological record require precipitation and surface water runoff to form the valley networks, in contradiction with climate simulations that predict a cold, icy ancient Mars. Here we present a global comparative study of valley network morphometry, using a principal-component-based analysis with physical models of fluvial, groundwater sapping and glacial and subglacial erosion. We found that valley formation involved all these processes, but that subglacial and fluvial erosion are the predominant mechanisms. This is supported by predictions from models of steady-state erosion and geomorphological comparisons to terrestrial analogues. The inference of subglacial channels among the valley networks supports the presence of ice sheets that covered the southern highlands during the time of valley network emplacement. © 2020, The Author(s), under exclusive licence to Springer Nature Limited.
英文关键词	geological record; geomorphology; groundwater; ice sheet; Mars; paleoclimate; runoff; subglacial environment; surface water; valley
语种	英语
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/206779
作者单位	Department of Earth, Ocean and Atmospheric Sciences, University of British Columbia, Vancouver, BC, Canada; School of Earth and Space Exploration, Arizona State University, Tempe, AZ, United States; Department of Earth Sciences, University of Western Ontario, London, ON, Canada; Institute for Earth and Space Exploration, University of Western Ontario, London, ON, Canada
推荐引用方式 GB/T 7714	Grau Galofre A.,Jellinek A.M.,Osinski G.R.. Valley formation on early Mars by subglacial and fluvial erosion[J],2020,13(10).
APA	Grau Galofre A.,Jellinek A.M.,&Osinski G.R..(2020).Valley formation on early Mars by subglacial and fluvial erosion.Nature Geoscience,13(10).
MLA	Grau Galofre A.,et al."Valley formation on early Mars by subglacial and fluvial erosion".Nature Geoscience 13.10(2020).