DOI: 10.1002/2017JE005513
Scopus记录号: 2-s2.0-85049842914
论文题名: Coarse Sediment Transport in the Modern Martian Environment
作者: Baker M.M. ; Newman C.E. ; Lapotre M.G.A. ; Sullivan R. ; Bridges N.T. ; Lewis K.W.
刊名: Journal of Geophysical Research: Planets
ISSN: 21699097
出版年: 2018
卷: 123, 期: 6 起始页码: 1380
结束页码: 1394
语种: 英语
英文关键词: aeolian transport
; atmosphere-surface interactions
; Curiosity rover imaging campaigns
Scopus关键词: crater
; eolian process
; Mars
; Martian atmosphere
; sand
; seasonal variation
; sediment transport
; space technology
; wind
英文摘要: The occurrence of regional and global dust storms, observations of migrating ripples and dunes, and the recognition of aeolian sandstone outcrops demonstrate that aeolian processes have been and continue to be a significant agent of surface modification on Mars. However, the mechanisms of aeolian transport within Mars' low atmospheric pressure surface environment are still not fully understood. This work presents a synthesis of change detection observations conducted with the Mars Science Laboratory Curiosity rover in Gale crater over three Martian years. Sediment mobility during this period was highly variable, consistent with previous orbiter-based observations showing strong seasonal variability, with strongest winds expected during southern summer. Wind activity inferred at each change detection site helps test the accuracy of atmospheric models, as well as constrain the intensity of current atmosphere-surface interactions and the physics of sand transport in the tenuous Martian atmosphere. Results indicate an apparent discrepancy between predicted wind speeds and the wind strengths required by classical incipient-motion models to explain observed sediment motion. Observed mobilization of perched and/or isolated very coarse sand grains and fine pebbles (i.e., grain sizes 1 mm ≤d≤3 mm) likely requires an alternate explanation, such as very strong but infrequent wind gusts, drag-induced rolling, or impact-driven creep caused by smaller saltating particles. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113771
Appears in Collections: 气候减缓与适应
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作者单位: Morton K. Blaustein Department of Earth and Planetary Sciences, The Johns Hopkins University, Baltimore, MD, United States; Aeolis Research, Pasadena, CA, United States; Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA, United States; Cornell Center for Astrophysics and Planetary Science, Cornell University, Ithaca, NY, United States; Applied Physics Laboratory, The Johns Hopkins University, Laurel, MD, United States
Recommended Citation:
Baker M.M.,Newman C.E.,Lapotre M.G.A.,et al. Coarse Sediment Transport in the Modern Martian Environment[J]. Journal of Geophysical Research: Planets,2018-01-01,123(6)