globalchange  > 气候减缓与适应
DOI: 10.1038/ngeo2706
论文题名:
Transport processes induced by metastable boiling water under Martian surface conditions
作者: Massé M.; Conway S.J.; Gargani J.; Patel M.R.; Pasquon K.; McEwen A.; Carpy S.; Chevrier V.; Balme M.R.; Ojha L.; Vincendon M.; Poulet F.; Costard F.; Jouannic G.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2016
卷: 9, 期:6
起始页码: 425
结束页码: 428
语种: 英语
Scopus关键词: brine ; experimental study ; Mars ; Martian atmosphere ; planetary landform ; planetary surface ; saltation ; sediment transport ; surface pressure
英文摘要: Liquid water may exist on the Martian surface today, albeit transiently and in a metastable state under the low atmospheric surface pressure. However, the identification of liquid water on Mars from observed morphological changes is hampered by our limited understanding of how metastable liquids interact with sediments. Here, we present lab experiments in which a block of ice melts and seeps into underlying sediment, and the resulting downslope fluid propagation and sediment transport are tracked. In experiments at Martian surface pressure, we find that pure water boils as it percolates into the sediment, inducing grain saltation and leading to wholesale slope destabilization: a hybrid flow mechanism involving both wet and dry processes. For metastable brines, which are more stable under Martian conditions than pure water, saltation intensity and geomorphological impact are reduced; however, we observed channel formation in some briny flow experiments that may be analogous to morphologies observed on Mars. In contrast, under terrestrial-like experimental conditions, there is little morphological impact of seeping water or brine, which are both stable. We propose that the hybrid flow mechanism operating in our experiments under Martian surface pressure could explain observed Martian surface changes that were originally interpreted as the products of either dry or wet processes. © 2016 Macmillan Publishers Limited.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106003
Appears in Collections:气候减缓与适应
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作者单位: Laboratoire de Planétologie et Géodynamique, UMR 6112, Université de Nantes, 2 chemin de la Houssinière, Nantes Cedex 3, France; Institut d'Astrophysique Spatiale, Université Paris-Sud XI, Bâtiment 121, Orsay Cedex, France; Department of Physical Sciences, Open University,Walton Hall, Milton Keynes, United Kingdom; Géosciences Paris Sud, CNRS, Université Paris-Sud XI, Rue du Belvédère, Orsay Cedex, France; Lunar and Planetary Laboratory, University of Arizona, 1541 E. University Boulevard, Tucson, AZ, United States; Keck Laboratory for Space and Planetary Simulation, Arkansas Center for Space and Planetary Science, University of Arkansas, Fayetteville, AR, United States; School of Earth and Atmospheric Sciences, Georgia Institute of Technology, 311 First Drive, Atlanta, GA, United States; Cerema, LRPC Nancy, Tomblaine, France

Recommended Citation:
Massé M.,Conway S.J.,Gargani J.,et al. Transport processes induced by metastable boiling water under Martian surface conditions[J]. Nature Geoscience,2016-01-01,9(6)
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