气候变化领域集成服务门户(CCPortal): The Rheological Behavior of CO2 Ice: Application to Glacial Flow on Mars

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DOI	10.1029/2020GL090431
	The Rheological Behavior of CO2 Ice: Application to Glacial Flow on Mars
	Cross A.J.; Goldsby D.L.; Hager T.F.; Smith I.B.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:22
英文摘要	Vast quantities of solid CO2 reside in topographic basins of the south polar layered deposits (SPLD) on Mars and exhibit morphological features indicative of glacial flow. Previous experimental studies showed that CO2 ice is 1–2 orders of magnitude weaker than water ice under Martian polar conditions. Here we present data from deformation experiments on pure, fine-grained CO2 ice, over a broader range of temperatures than previously explored (158–213 K). The experiments confirm previous observations of highly nonlinear power law creep at larger stresses, but also show a transition to a previously unseen linear-viscous creep regime at lower stresses. We examine the viscosity of CO2 within the SPLD and predict that the CO2-rich deposits are modestly stronger than previously thought. Nevertheless, CO2 ice flows much more readily than H2O ice, particularly on the steep flanks of SPLD topographic basins, allowing the CO2 to pond as observed. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	Carbon dioxide; Creep; Deposits; Glacial geology; Fine grained; Layered deposits; Linear viscous; Morphological features; Non-linear power law; Orders of magnitude; Polar conditions; Rheological behaviors; Ice; carbon dioxide; ice cover; Mars; power law; rheology
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/169426
作者单位	Department of Earth and Environmental Science, University of Pennsylvania, Philadelphia, PA, United States; Department of Geology and Geophysics, Woods Hole Oceanographic Institution, Woods Hole, MA, United States; Lassonde School of Engineering, York University, Toronto, ON, Canada; Planetary Science Institute, Lakewood, CO, United States
推荐引用方式 GB/T 7714	Cross A.J.,Goldsby D.L.,Hager T.F.,et al. The Rheological Behavior of CO2 Ice: Application to Glacial Flow on Mars[J],2020,47(22).
APA	Cross A.J.,Goldsby D.L.,Hager T.F.,&Smith I.B..(2020).The Rheological Behavior of CO2 Ice: Application to Glacial Flow on Mars.Geophysical Research Letters,47(22).
MLA	Cross A.J.,et al."The Rheological Behavior of CO2 Ice: Application to Glacial Flow on Mars".Geophysical Research Letters 47.22(2020).