globalchange  > 气候减缓与适应
DOI: 10.1002/2017JE005477
Scopus记录号: 2-s2.0-85042305497
论文题名:
The Spectral Nature of Titan's Major Geomorphological Units: Constraints on Surface Composition
作者: Solomonidou A.; Coustenis A.; Lopes R.M.C.; Malaska M.J.; Rodriguez S.; Drossart P.; Elachi C.; Schmitt B.; Philippe S.; Janssen M.; Hirtzig M.; Wall S.; Sotin C.; Lawrence K.; Altobelli N.; Bratsolis E.; Radebaugh J.; Stephan K.; Brown R.H.; Le Mouélic S.; Le Gall A.; Villanueva E.V.; Brossier J.F.; Bloom A.A.; Witasse O.; Matsoukas C.; Schoenfeld A.
刊名: Journal of Geophysical Research: Planets
ISSN: 21699097
出版年: 2018
卷: 123, 期:2
起始页码: 489
结束页码: 507
语种: 英语
英文关键词: geomorphological units ; radiative transfer ; saturnian satellites ; spectral behavior ; Titan composition ; Titan geology
Scopus关键词: albedo ; geomorphological mapping ; haze ; planetary evolution ; planetary surface ; radiative transfer ; Saturn ; spectral analysis ; Titan
英文摘要: We investigate Titan's low-latitude and midlatitude surface using spectro-imaging near-infrared data from Cassini/Visual and Infrared Mapping Spectrometer. We use a radiative transfer code to first evaluate atmospheric contributions and then extract the haze and the surface albedo values of major geomorphological units identified in Cassini Synthetic Aperture Radar data, which exhibit quite similar spectral response to the Visual and Infrared Mapping Spectrometer data. We have identified three main categories of albedo values and spectral shapes, indicating significant differences in the composition among the various areas. We compare with linear mixtures of three components (water ice, tholin-like, and a dark material) at different grain sizes. Due to the limited spectral information available, we use a simplified model, with which we find that each albedo category of regions of interest can be approximately fitted with simulations composed essentially by one of the three surface candidates. Our fits of the data are overall successful, except in some cases at 0.94, 2.03, and 2.79 μm, indicative of the limitations of our simplistic compositional model and the need for additional components to reproduce Titan's complex surface. Our results show a latitudinal dependence of Titan's surface composition, with water ice being the major constituent at latitudes beyond 30°N and 30°S, while Titan's equatorial region appears to be dominated partly by a tholin-like or by a very dark unknown material. The albedo differences and similarities among the various geomorphological units give insights on the geological processes affecting Titan's surface and, by implication, its interior. We discuss our results in terms of origin and evolution theories. ©2018. American Geophysical Union. 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/114616
Appears in Collections:气候减缓与适应

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作者单位: California Institute of Technology, Pasadena, CA, United States; European Space Astronomy Centre, European Space Agency, Madrid, Spain; LESIA-Observatoire de Paris, Paris Sciences and Letters Research University, CNRS, Sorbonne Université, Université Paris-Diderot, Meudon, France; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States; Institut de Physique du Globe de Paris, CNRS-UMR 7154, Université Paris-Diderot, USPC, Paris, France; Institut de Planétologie et d'Astrophysique de Grenoble, Université Grenoble Alpes, CNRS, Grenoble, France; Fondation “La main à la pâte”, Montrouge, France; Department of Physics, University of Athens, Athens, Greece; Department of Geological Sciences, Brigham Young University, Provo, UT, United States; Institute of Planetary Research, DLR, Berlin, Germany; Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ, United States; Laboratoire de Planétologie et Géodynamique, CNRS UMR 6112, Université de Nantes, Nantes, France; LATMOS/IPSL, UPMC Université Paris 6, Sorbonne Universités, UVSQ, CNRS, Paris, France; European Space Research and Technology Centre, European Space Agency, Noordwijk, Netherlands; KTH-Royal Institute of Technology, Stockholm, Sweden; Department of Earth, Planetary, and Space Sciences, University of Calilfornia, Los Angeles, CA, United States

Recommended Citation:
Solomonidou A.,Coustenis A.,Lopes R.M.C.,et al. The Spectral Nature of Titan's Major Geomorphological Units: Constraints on Surface Composition[J]. Journal of Geophysical Research: Planets,2018-01-01,123(2)
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