GSTDTAP  > 气候变化
DOI10.1029/2018GL079040
The Bagnold Dunes in Southern Summer: Active Sediment Transport on Mars Observed by the Curiosity Rover
Baker, Mariah M.1; Lapotre, Mathieu G. A.2; Minitti, Michelle E.3; Newman, Claire E.4; Sullivan, Robert5; Weitz, Catherine M.6; Rubin, David M.7; Vasavada, Ashwin R.8; Bridges, Nathan T.; Lewis, Kevin W.1
2018-09-16
发表期刊GEOPHYSICAL RESEARCH LETTERS
ISSN0094-8276
EISSN1944-8007
出版年2018
卷号45期号:17页码:8853-8863
文章类型Article
语种英语
国家USA
英文摘要

Orbiter-based observations have demonstrated that active aeolian environments are ubiquitous across Mars. Here we examine one such environment, the Bagnold Dune Field in Gale crater, with repeat imaging campaigns conducted from Curiosity during southern summer. Images reveal widespread migration of aeolian impact ripples (up to 2.8 cm/sol), which is in stark contrast to the inactivity of similar bedforms during southern winter. The winds responsible for steady southwestward migration of ripples are consistent with predictions of regional-scale flows that enter the crater from the north and interact with the topography of Mount Sharp but are not fully representative of all dune-forming winds. Inferred friction speeds of 1.5 m/s needed to explain mobilization of bedforms are likely not being achieved, and thus, a majority of sediment transport may be taking place at subthreshold conditions. This hypothesis is further supported by sand flux estimates that suggest a low saltation flux environment within the dune field.


Plain Language Summary A wealth of orbital images have revealed that wind is actively moving sand on the surface of Mars; landed instruments enable a closer look at these processes. Images acquired during southern summer by the Curiosity rover in Gale crater revealed high levels of wind activity, in contrast to previous imaging done during southern winter. A majority of ripple migration occurs toward the southwest, with ripples moving up to 2.8 cm per day. These findings are consistent with models that predict southern summer to be the windiest season at this location on Mars, with strong regional winds flowing over the northern crater rim and causing strong southwestward flow along the floor of the crater in the vicinity of the rover. Despite the fact that bedforms are active, models do not predict that the wind should be strong enough to initiate motion, which challenges our understanding of the physics of sediment transport under Martian conditions.


领域气候变化
收录类别SCI-E
WOS记录号WOS:000445727500018
WOS关键词GENERAL-CIRCULATION MODEL ; GALE CRATER ; AEOLIAN ACTIVITY ; LONGITUDINAL DUNES ; SAND FLUXES ; RIPPLES ; WINDS ; EARTH ; THRESHOLD ; SALTATION
WOS类目Geosciences, Multidisciplinary
WOS研究方向Geology
引用统计
文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/27623
专题气候变化
作者单位1.Johns Hopkins Univ, Morton K Blaustein Dept Earth & Planetary Sci, Baltimore, MD 21218 USA;
2.Harvard Univ, Dept Earth & Planetary Sci, 20 Oxford St, Cambridge, MA 02138 USA;
3.Arizona State Univ, Sch Earth & Space Explorat, Tempe, AZ USA;
4.Aeolis Res, Pasadena, CA USA;
5.Cornell Univ, Cornell Ctr Astrophys & Planetary Sci, Ithaca, NY USA;
6.Planetary Sci Inst, Tucson, AZ USA;
7.Univ Calif Santa Cruz, Dept Earth & Planetary Sci, Santa Cruz, CA 95064 USA;
8.CALTECH, Jet Prop Lab, Pasadena, CA 91125 USA
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Baker, Mariah M.,Lapotre, Mathieu G. A.,Minitti, Michelle E.,et al. The Bagnold Dunes in Southern Summer: Active Sediment Transport on Mars Observed by the Curiosity Rover[J]. GEOPHYSICAL RESEARCH LETTERS,2018,45(17):8853-8863.
APA Baker, Mariah M..,Lapotre, Mathieu G. A..,Minitti, Michelle E..,Newman, Claire E..,Sullivan, Robert.,...&Lewis, Kevin W..(2018).The Bagnold Dunes in Southern Summer: Active Sediment Transport on Mars Observed by the Curiosity Rover.GEOPHYSICAL RESEARCH LETTERS,45(17),8853-8863.
MLA Baker, Mariah M.,et al."The Bagnold Dunes in Southern Summer: Active Sediment Transport on Mars Observed by the Curiosity Rover".GEOPHYSICAL RESEARCH LETTERS 45.17(2018):8853-8863.
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