DOI: 10.1002/2015GL067298
论文题名: Viscous flow rates of icy topography on the north polar layered deposits of Mars
作者: Sori M.M. ; Byrne S. ; Hamilton C.W. ; Landis M.E.
刊名: Geophysical Research Letters
ISSN: 0094-9443
EISSN: 1944-9174
出版年: 2016
卷: 43, 期: 2 起始页码: 541
结束页码: 549
语种: 英语
英文关键词: craters
; ice
; Mars
; polar layered deposits
; viscous flow
Scopus关键词: Carbon
; Carbon dioxide
; Deposits
; Finite element method
; Flow velocity
; Ice
; Competing effects
; Crater sizes
; Craters
; Impact craters
; Layered deposits
; Mars
; Steady state
; Viscous relaxation
; Viscous flow
; carbon dioxide
; crater
; dust
; finite element method
; flow velocity
; Mars
; topography
; viscous flow
英文摘要: We investigate the importance of viscous flow in shaping topography at the north polar layered deposits (NPLD) of Mars by using finite element modeling to calculate the distribution of stresses and flow velocities. Present-day impact craters on the NPLD are too small and cold for viscous relaxation to have been an important mechanism in controlling their current dimensions; this effect may be ignored when analyzing crater size-frequency distributions. Scarps at the NPLD margins, where avalanches of dust and carbon dioxide frost occur, are sufficiently steep, high, and warm to experience significant viscous flow. We find flow velocities at the base of these steep scarps on the order of tens to hundreds of cm/yr, which are fast enough to significantly affect their slope over kiloyear timescales. Alternatively, the scarps could be close to steady state in which observed block falls provide a competing effect to viscous flow. © 2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84955458215&doi=10.1002%2f2015GL067298&partnerID=40&md5=069a396cdf5bf7c3beb6b94c0fcfd576
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/10406
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: Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ, United States
Recommended Citation:
Sori M.M.,Byrne S.,Hamilton C.W.,et al. Viscous flow rates of icy topography on the north polar layered deposits of Mars[J]. Geophysical Research Letters,2016-01-01,43(2).