globalchange  > 气候减缓与适应
DOI: 10.1038/ngeo2936
论文题名:
Geomorphological evidence for ground ice on dwarf planet Ceres
作者: Schmidt B.E.; Hughson K.H.G.; Chilton H.T.; Scully J.E.C.; Platz T.; Nathues A.; Sizemore H.; Bland M.T.; Byrne S.; Marchi S.; O'Brien D.P.; Schorghofer N.; Hiesinger H.; Jaumann R.; Pasckert J.H.; Lawrence J.D.; Buzckowski D.; Castillo-Rogez J.C.; Sykes M.V.; Schenk P.M.; Desanctis M.-C.; Mitri G.; Formisano M.; Li J.-Y.; Reddy V.; LeCorre L.; Russell C.T.; Raymond C.A.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2017
卷: 10, 期:5
起始页码: 338
结束页码: 343
语种: 英语
Scopus关键词: asteroid ; geomorphology ; landslide ; meteorite ; planet ; spacecraft ; Ceres
英文摘要: Five decades of observations of Ceres suggest that the dwarf planet has a composition similar to carbonaceous meteorites and may have an ice-rich outer shell protected by a silicate layer. NASA's Dawn spacecraft has detected ubiquitous clays, carbonates and other products of aqueous alteration across the surface of Ceres, but surprisingly it has directly observed water ice in only a few areas. Here we use Dawn Framing Camera observations to analyse lobate morphologies on Ceres' surface and we infer the presence of ice in the upper few kilometres of Ceres. We identify three distinct lobate morphologies that we interpret as surface flows: thick tongue-shaped, furrowed flows on steep slopes; thin, spatulate flows on shallow slopes; and cuspate sheeted flows that appear fluidized. The shapes and aspect ratios of these flows are different from those of dry landslides - including those on ice-poor Vesta - but are morphologically similar to ice-rich flows on other bodies, indicating the involvement of ice. Based on the geomorphology and poleward increase in prevalence of these flows, we suggest that the shallow subsurface of Ceres is comprised of mixtures of silicates and ice, and that ice is most abundant near the poles. © 2017 Macmillan Publishers Limited, part of Springer Nature. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105790
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: Georgia Institute of Technology, Atlanta, GA, United States; University of California at Los Angeles, Los Angeles, CA, United States; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States; Max-Planck Institut Für Sonnensystemforschung, Gttingen, Germany; Planetary Science Institute, Tucson, AZ, United States; United States Geological Survey, Flagstaff, AZ, United States; University of Arizona, Tucson, AZ, United States; Southwest Research Institute, Boulder, CO, United States; University of Hawaii at Manoa, Honolulu, HI, United States; Institut Für Planetologie, Westfälische Wilhelms-Universität, Münster, Germany; German Aerospace Center (DLR), Berlin, Germany; Applied Physics Laboratory, Johns Hopkins University, Laurel, MD, United States; Lunar and Planetary Institute, Houston, TX, United States; Istituto di Astrofisica e Planetologia Spaziali, INAF, Roma, Italy; Universite de Nantes, Nantes, France

Recommended Citation:
Schmidt B.E.,Hughson K.H.G.,Chilton H.T.,et al. Geomorphological evidence for ground ice on dwarf planet Ceres[J]. Nature Geoscience,2017-01-01,10(5)
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