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DOI | 10.1038/NGEO2917 |
Formation of recurring slope lineae on Mars by rarefied gas-triggered granular flows | |
Schmidt, Frederic1; Andrieu, Francois1; Costard, Francois1; Kocifaj, Miroslav2,3; Meresescu, Alina G.1 | |
2017-04-01 | |
发表期刊 | NATURE GEOSCIENCE
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ISSN | 1752-0894 |
EISSN | 1752-0908 |
出版年 | 2017 |
卷号 | 10期号:4 |
文章类型 | Article |
语种 | 英语 |
国家 | France; Slovakia |
英文摘要 | Active dark flows known as recurring slope lineae have been observed on the warmest slopes of equatorial Mars. The morphology, composition and seasonality of the lineae suggest a role of liquid water in their formation. However, internal and atmospheric sources of water appear to be insufficient to sustain the observed slope activity. Experimental evidence suggests that under the low atmospheric pressure at the surface of Mars, gas can flow upwards through porous Martian soil due to thermal creep under surface regions heated by the Sun, and disturb small particles. Here we present numerical simulations to demonstrate that such a dry process involving the pumping of rarefied gas in the Martian soil due to temperature contrasts can explain the formation of the recurring slope lineae. In our simulations, solar irradiation followed by shadow significantly reduces the angle of repose due to the resulting temporary temperature gradients over shaded terrain, and leads to flow at intermediate slope angles. The simulated flow locations are consistent with observed recurring slope lineae that initiate in rough and bouldered terrains with local shadows over the soil. We suggest that this dry avalanche process can explain the formation of the recurring slope lineae on Mars without requiring liquid water or CO2 frost activity. |
领域 | 地球科学 ; 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000398162800013 |
WOS关键词 | THERMAL EMISSION SPECTROMETER ; DUST ; PHOTOPHORESIS ; SURFACE ; CYCLE |
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/34953 |
专题 | 地球科学 气候变化 |
作者单位 | 1.Univ Paris Saclay, Univ Paris Sud, CNRS, GEOPS, Rue Belvedere,Bat 504-509, F-91405 Orsay, France; 2.Slovak Acad Sci, ICA, Dubravska Rd 9, Bratislava 84503, Slovakia; 3.Comenius Univ, Fac Math Phys & Informat, Bratislava 84248, Slovakia |
推荐引用方式 GB/T 7714 | Schmidt, Frederic,Andrieu, Francois,Costard, Francois,et al. Formation of recurring slope lineae on Mars by rarefied gas-triggered granular flows[J]. NATURE GEOSCIENCE,2017,10(4). |
APA | Schmidt, Frederic,Andrieu, Francois,Costard, Francois,Kocifaj, Miroslav,&Meresescu, Alina G..(2017).Formation of recurring slope lineae on Mars by rarefied gas-triggered granular flows.NATURE GEOSCIENCE,10(4). |
MLA | Schmidt, Frederic,et al."Formation of recurring slope lineae on Mars by rarefied gas-triggered granular flows".NATURE GEOSCIENCE 10.4(2017). |
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