DOI: 10.1073/pnas.2001648117
论文题名: Spontaneous formation of geysers at only one pole on Enceladus’s ice shell
作者: Kang W. ; Flierl G.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2020
卷: 117, 期: 26 起始页码: 14764
结束页码: 14768
语种: 英语
英文关键词: Enceladus
; Icy moon
; Planetary science
Scopus关键词: ice
; Article
; astronomy
; complex formation
; geology
; mathematical model
; moon
; priority journal
; seasonal variation
; topography
英文摘要: The ice shell on Enceladus, an icy moon of Saturn, exhibits strong asymmetry between the northern and southern hemispheres, with all known geysers concentrated over the south pole, even though the expected pattern of tidal forced deformation should be symmetric between the north and south poles. Using an idealized ice-evolution model, we demonstrate that this asymmetry may form spontaneously, without any noticeable a priori asymmetry (such as a giant impact or a monopole structure of geological activity), in contrast to previous studies. Infinitesimal asymmetry in the ice shell thickness due to random perturbations are found to be able to grow indefinitely, ending up significantly thinning the ice shell at one of the poles, thereby allowing fracture formation there. Necessary conditions to trigger this hemispheric symmetry-breaking mechanism are found analytically. A rule of thumb we find is that, for Galilean and Saturnian icy moons, the ice shell can undergo hemispheric symmetry breaking only if the mean shell thickness is around 10 to 30 km. © 2020 National Academy of Sciences. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/163449
Appears in Collections: 气候变化与战略
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作者单位: Kang, W., Earth, Atmospheric and Planetary Science Department, Massachusetts Institute of Technology, Cambridge, MA 02139, United States; Flierl, G., Earth, Atmospheric and Planetary Science Department, Massachusetts Institute of Technology, Cambridge, MA 02139, United States
Recommended Citation:
Kang W.,Flierl G.. Spontaneous formation of geysers at only one pole on Enceladus’s ice shell[J]. Proceedings of the National Academy of Sciences of the United States of America,2020-01-01,117(26)