globalchange  > 气候减缓与适应
DOI: 10.1038/ngeo2546
论文题名:
Spectral evidence for hydrated salts in recurring slope lineae on Mars
作者: Ojha L.; Wilhelm M.B.; Murchie S.L.; Mcewen A.S.; Wray J.J.; Hanley J.; Massé M.; Chojnacki M.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2015
卷: 8, 期:11
起始页码: 829
结束页码: 832
语种: 英语
Scopus关键词: absorption ; hydration ; hydrological cycle ; hypothesis testing ; Mars ; salt water ; temperature effect ; terrain ; transient flow
英文摘要: Determining whether liquid water exists on the Martian surface is central to understanding the hydrologic cycle and potential for extant life on Mars. Recurring slope lineae, narrow streaks of low reflectance compared to the surrounding terrain, appear and grow incrementally in the downslope direction during warm seasons when temperatures reach about 250-300K, a pattern consistent with the transient flow of a volatile species. Brine flows (or seeps) have been proposed to explain the formation of recurring slope lineae, yet no direct evidence for either liquid water or hydrated salts has been found. Here we analyse spectral data from the Compact Reconnaissance Imaging Spectrometer for Mars instrument onboard the Mars Reconnaissance Orbiter from four different locations where recurring slope lineae are present. We find evidence for hydrated salts at all four locations in the seasons when recurring slope lineae are most extensive, which suggests that the source of hydration is recurring slope lineae activity. The hydrated salts most consistent with the spectral absorption features we detect are magnesium perchlorate, magnesium chlorate and sodium perchlorate. Our findings strongly support the hypothesis that recurring slope lineae form as a result of contemporary water activity on Mars. © 2015 Macmillan Publishers Limited.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106147
Appears in Collections:气候减缓与适应
科学计划与规划

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作者单位: School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA, United States; Space Science and Astrobiology Division, NASA Ames Research Center, Moffett Field, CA, United States; Applied Physics Laboratory, Laurel, MD, United States; Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ, United States; Department of Space Studies, Southwest Research Institute, Boulder, CO, United States; Laboratoire de Planétologie et Géodynamique, Nantes, France

Recommended Citation:
Ojha L.,Wilhelm M.B.,Murchie S.L.,et al. Spectral evidence for hydrated salts in recurring slope lineae on Mars[J]. Nature Geoscience,2015-01-01,8(11)
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