globalchange  > 气候减缓与适应
DOI: 10.1038/ngeo2475
论文题名:
Timing of water plume eruptions on Enceladus explained by interior viscosity structure
作者: Behounková M.; Tobie G.; Cadek O.; Choblet G.; Porco C.; Nimmo F.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2015
卷: 8, 期:8
起始页码: 601
结束页码: 604
语种: 英语
Scopus关键词: brightness temperature ; data set ; global ocean ; infrared radiation ; numerical model ; polar region ; prediction ; Saturn ; three-dimensional modeling ; viscosity ; water vapor
英文摘要: At the south pole of Saturn's icy moon Enceladus, eruptions of water vapour and ice emanate from warm tectonic ridges. Observations in the infrared and visible spectra have shown an orbital modulation of the plume brightness, which suggests that the eruption activity is influenced by tidal forces. However, the observed activity seems to be delayed by several hours with respect to predictions based on simple tidal models. Here we simulate the viscoelastic tidal response of Enceladus with a full three-dimensional numerical model and show that the delay in eruption activity may be a natural consequence of the viscosity structure in the south-polar region and the size of the putative subsurface ocean. By systematically comparing simulations of variations in normal stress along faults with plume brightness data, we show that the observed activity is reproduced for two classes of interior models with contrasting thermal histories: a low-viscosity convective region above a polar sea extending about 45°-60° from the south pole at a depth below the surface as small as 30 km, or a convecting ice shell of 60-70 km in thickness above a global ocean. Our analysis further shows that the eruption activity is controlled by the average normal stress applied across the cracks, thus providing a constraint on the eruption mechanism. © 2015 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/106263
Appears in Collections:气候减缓与适应
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作者单位: Charles University in Prague, Faculty of Mathematics and Physics, Department of Geophysics, V Holešovickách 2, Praha 8, Czech Republic; Université de Nantes, CNRS, Laboratoire de Planétologie et Géodynamique de Nantes, 2 rue de la Houssinière, Nantes Cedex, France; CICLOPS, Space Science Institute, Boulder, CO, United States; Department of Earth and Planetary Sciences, University of California, Santa Cruz, CA, United States

Recommended Citation:
Behounková M.,Tobie G.,Cadek O.,et al. Timing of water plume eruptions on Enceladus explained by interior viscosity structure[J]. Nature Geoscience,2015-01-01,8(8)
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