Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2018GL079040 |
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
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ISSN | 0094-8276 |
EISSN | 1944-8007 |
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 |
推荐引用方式 GB/T 7714 | 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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