Production and global transport of Titan’s sand particles

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• 作者：Jason W Barnes ; Ralph D Lorenz ; Jani Radebaugh ; Alexander G Hayes…
• 刊名：Planetary Science
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：4
• 期：1
• 全文大小：4,429 KB
• 参考文献：1.Lorenz RD, Wall S, Radebaugh J, Boubin G, Reffet E, Janssen M, et al. The Sand Seas of Titan: Cassini RADAR Observations of Longitudinal Dunes. Science. 2006; 312:724-.ADS View Article
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  27.Lorenz RD, Lunine JI, Grier JA, Fisher MA. Prediction of aeolian features on
• 作者单位：Jason W Barnes (1)
  Ralph D Lorenz (2)
  Jani Radebaugh (3)
  Alexander G Hayes (4)
  Karl Arnold (3)
  Clayton Chandler (3)
  
  1. Department of Physics, University of Idaho, Moscow, 83844-0903, Idaho, USA
  2. Applied Physics Laboratory, Johns Hopkins University, Laurel, 20723, MD, USA
  3. Department of Geology, Brigham Young University, Provo, 84602, UT, USA
  4. Department of Astronomy, Cornell University, Ithaca, 14853, NY, USA
  
• 刊物主题：Extraterrestrial Physics, Space Sciences; Planetology;
• 出版者：Springer US
• ISSN：2191-2521

文摘

Previous authors have suggested that Titan’s individual sand particles form by either sintering or by lithification and erosion. We suggest two new mechanisms for the production of Titan’s organic sand particles that would occur within bodies of liquid: flocculation and evaporitic precipitation. Such production mechanisms would suggest discrete sand sources in dry lakebeds. We search for such sources, but find no convincing candidates with the present Cassini Visual and Infrared Mapping Spectrometer coverage. As a result we propose that Titan’s equatorial dunes may represent a single, global sand sea with west-to-east transport providing sources and sinks for sand in each interconnected basin. The sand might then be transported around Xanadu by fast-moving Barchan dune chains and/or fluvial transport in transient riverbeds. A river at the Xanadu/Shangri-La border could explain the sharp edge of the sand sea there, much like the Kuiseb River stops the Namib Sand Sea in southwest Africa on Earth. Future missions could use the composition of Titan’s sands to constrain the global hydrocarbon cycle.