| DOI: | 10.1002/2017JE005459
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| Scopus记录号: | 2-s2.0-85040720774
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| 论文题名: | Crater Mound Formation by Wind Erosion on Mars |
| 作者: | Steele L.J.; Kite E.S.; Michaels T.I.
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| 刊名: | Journal of Geophysical Research: Planets
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| ISSN: | 21699097
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| 出版年: | 2018
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| 卷: | 123, 期:1 | | 起始页码: | 113
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| 结束页码: | 130
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| 语种: | 英语
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| 英文关键词: | circulation
; crater
; Mars
; mesoscale
; mountains
; sedimentary
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| Scopus关键词: | canyon
; crater
; erosion rate
; Mars
; mountain
; sedimentary rock
; surface wind
; wind erosion
; wind stress
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| 英文摘要: | Most of Mars' ancient sedimentary rocks by volume are in wind-eroded sedimentary mounds within impact craters and canyons, but the connections between mound form and wind erosion are unclear. We perform mesoscale simulations of different crater and mound morphologies to understand the formation of sedimentary mounds. As crater depth increases, slope winds produce increased erosion near the base of the crater wall, forming mounds. Peak erosion rates occur when the crater depth is ∼2 km. Mound evolution depends on the size of the host crater. In smaller craters mounds preferentially erode at the top, becoming more squat, while in larger craters mounds become steeper sided. This agrees with observations where smaller craters tend to have proportionally shorter mounds and larger craters have mounds encircled by moats. If a large-scale sedimentary layer blankets a crater, then as the layer recedes across the crater it will erode more toward the edges of the crater, resulting in a crescent-shaped moat. When a 160 km diameter mound-hosting crater is subject to a prevailing wind, the surface wind stress is stronger on the leeward side than on the windward side. This results in the center of the mound appearing to “march upwind” over time and forming a “bat-wing” shape, as is observed for Mount Sharp in Gale crater. ©2017. American Geophysical Union. All Rights Reserved. |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/114796
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| Appears in Collections: | 气候减缓与适应
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作者单位: | Department of Geophysical Sciences, University of Chicago, Chicago, IL, United States; SETI Institute, Mountain View, CA, United States
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| Recommended Citation: | |
Steele L.J.,Kite E.S.,Michaels T.I.. Crater Mound Formation by Wind Erosion on Mars[J]. Journal of Geophysical Research: Planets,2018-01-01,123(1)
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