DOI: | 10.1002/2016GL070650
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论文题名: | Enceladus's and Dione's floating ice shells supported by minimum stress isostasy |
作者: | Beuthe M.; Rivoldini A.; Trinh A.
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刊名: | Geophysical Research Letters
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ISSN: | 0094-8528
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EISSN: | 1944-8259
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出版年: | 2016
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卷: | 43, 期:19 | 起始页码: | 10088
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结束页码: | 10096
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语种: | 英语
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英文关键词: | crust
; Dione
; Enceladus
; gravity
; isostasy
; subsurface ocean
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Scopus关键词: | Geodesy
; Gravitation
; Oceanography
; Crust
; Dione
; Enceladus
; Isostasy
; Sub-surface ocean
; Shells (structures)
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英文摘要: | Enceladus's gravity and shape have been explained in terms of a thick isostatic ice shell floating on a global ocean, in contradiction of the thin shell implied by librations. Here we propose a new isostatic model minimizing crustal deviatoric stress and demonstrate that gravity and shape data predict a 38 ± 4 km thick ocean beneath a 23 ± 4 km thick shell agreeing with—but independent of—libration data. Isostatic and tidal stresses are comparable in magnitude. South polar crust is only 7 ± 4 km thick, facilitating the opening of water conduits and enhancing tidal dissipation through stress concentration. Enceladus's resonant companion, Dione, is in a similar state of minimum stress isostasy. Its gravity and shape can be explained in terms of a 99 ± 23 km thick isostatic shell overlying a 65 ± 30 km thick global ocean, thus providing the first clear evidence for a present-day ocean within Dione. ©2016. American Geophysical Union. All Rights Reserved. |
URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84990940886&doi=10.1002%2f2016GL070650&partnerID=40&md5=d4b70ecb698a9ae9065bd6b7700a1115
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Citation statistics: |
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资源类型: | 期刊论文
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标识符: | http://119.78.100.158/handle/2HF3EXSE/9491
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Appears in Collections: | 科学计划与规划 气候变化与战略
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作者单位: | Royal Observatory of Belgium, Brussels, Belgium
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Recommended Citation: |
Beuthe M.,Rivoldini A.,Trinh A.. Enceladus's and Dione's floating ice shells supported by minimum stress isostasy[J]. Geophysical Research Letters,2016-01-01,43(19).
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