globalchange  > 气候减缓与适应
DOI: 10.1029/2017JE005399
Scopus记录号: 2-s2.0-85046537653
论文题名:
Geological Evolution of Titan's Equatorial Regions: Possible Nature and Origin of the Dune Material
作者: Brossier J.F.; Rodriguez S.; Cornet T.; Lucas A.; Radebaugh J.; Maltagliati L.; Le Mouélic S.; Solomonidou A.; Coustenis A.; Hirtzig M.; Jaumann R.; Stephan K.; Sotin C.
刊名: Journal of Geophysical Research: Planets
ISSN: 21699097
出版年: 2018
卷: 123, 期:5
起始页码: 1089
结束页码: 1112
语种: 英语
英文关键词: Cassini ; geological processes ; infrared and radar observations ; Titan surface
Scopus关键词: dune field ; infrared spectroscopy ; planetary atmosphere ; planetary evolution ; planetary surface ; radar ; satellite mission ; structural geology ; synthetic aperture radar ; Titan
英文摘要: In 13 years, infrared observations from the Visual and Infrared Mapping Spectrometer onboard Cassini provided significant hints about the spectral and geological diversity of Titan's surface. The analysis of the infrared (IR) signature of spectral units enables constraining the surface composition, which is crucial for understanding possible interactions between Titan's interior, surface, and atmosphere. Here we investigate a selection of areas in the equatorial regions, imaged by Cassini's instruments, which exhibit an apparent transition from the Visual and Infrared Mapping Spectrometer IR-bright to the IR-blue and IR-brown units (from false-color composites using red: 1.57/1.27 μm, green: 2.01/1.27 μm, and blue: 1.27/1.08 μm). By applying an updated radiative transfer model, we extract the surface albedo of IR units identified in these regions. Then, we compare them with synthetic mixtures of two expected components on Titan's surface, namely, water ice and laboratory tholins. This allows us to reconnect the derived composition and grain size information to the geomorphology observed from Radio Detection and Ranging instrument (RADAR)/Synthetic Aperture Radar images. We interpret IR-bright units as hills and plains coated by organic material and incised by fluvial networks. Erosion products are transported downstream to areas where IR-blue units are seen near the IR-bright units. These units, enriched in water ice, are most likely outwash plains hosting debris from fluvial erosion. Farther away from the IR-bright units, the IR-brown units are dominantly made of organics with varied grain sizes, ranging from dust- to sand-sized particles that form the dune fields. The transition areas therefore exhibit trends in water ice content and grain size supported by geomorphological observations. ©2018. The Authors.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113941
Appears in Collections:气候减缓与适应

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作者单位: Institute of Planetary Research, German Aerospace Center (DLR), Berlin, Germany; Institut de Physique du Globe de Paris, CNRS-UMR 7154, Université Paris-Diderot, USPC, Paris, France; Laboratoire Astrophysique, Instrumentation et Modélisation, CNRS-UMR 7158, Université Paris-Diderot, USPC, CEA-Saclay, Paris, France; European Space Agency, European Space Astronomy Center, Madrid, Spain; Department of Geological Sciences, Brigham Young University, Provo, UT, United States; Nature Publishing Group, London, United Kingdom; Laboratoire de Planétologie et Géodynamique, CNRS-UMR 6112, Université de Nantes, Nantes, France; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States; Laboratoire d'études spatiales et d'instrumentation en astrophysique, Observatoire de Paris, CNRS, UPMC Université Paris 06, Université Paris-Diderot, Meudon, France; Fondation “La main à la pâte”, Montrouge, France

Recommended Citation:
Brossier J.F.,Rodriguez S.,Cornet T.,et al. Geological Evolution of Titan's Equatorial Regions: Possible Nature and Origin of the Dune Material[J]. Journal of Geophysical Research: Planets,2018-01-01,123(5)
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