DOI: 10.1038/ngeo2921
论文题名: Electrification of sand on Titan and its influence on sediment transport
作者: Harper J.S.M. ; McDonald G.D. ; Dufek J. ; Malaska M.J. ; Burr D.M. ; Hayes A.G. ; McAdams J. ; Wray J.J.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2017
卷: 10, 期: 4 起始页码: 260
结束页码: 265
语种: 英语
Scopus关键词: aggregation
; dune
; electrification
; granular medium
; laboratory method
; organic matter
; particle motion
; saltation
; sand
; sediment transport
; threshold
; Titan
; wind field
英文摘要: Triboelectric, or frictional, charging is a ubiquitous yet poorly understood phenomenon in granular flows. Recognized in terrestrial volcanic plumes and sand storms, such electrification mechanisms are possibly present on Titan. There, dunes and plains of low-density organic particles blanket extensive regions of the surface. Unlike Earth, Titan hosts granular reservoirs whose physical and chemical properties possibly enhance the effects of charging on particle motion. Here we demonstrate in laboratory tumbler experiments under atmospheric conditions and using organic materials analogous to Titan that Titan sands can readily charge triboelectrically. We suggest that the resulting electrostatic forces are strong enough to promote aggregation of granular materials and affect sediment transport on Titan. Indeed, our experiments show that electrostatic forces may increase the saltation threshold for grains by up to an order of magnitude. Efficient electrification may explain puzzling observations on Titan such as the mismatch between dune orientations and inferred wind fields. We conclude that, unlike other Solar System bodies, nanometre-scale electrostatic processes may shape the geomorphological features of Titan across the moon's surface. © 2017 Macmillan Publishers Limited, part of Springer Nature. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105798
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; School of Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, GA, United States; Jet Propulsion Laboratory, Pasadena, CA, United States; Department of Earth and Planetary Science, University of Tennessee - Knoxville, Knoxville, TN, United States; Department of Astronomy, Cornell University, Ithaca, NY, United States
Recommended Citation:
Harper J.S.M.,McDonald G.D.,Dufek J.,et al. Electrification of sand on Titan and its influence on sediment transport[J]. Nature Geoscience,2017-01-01,10(4)