气候变化领域集成服务门户(CCPortal): Flexure of the Lithosphere Beneath the North Polar Cap of Mars: Implications for Ice Composition and Heat Flow

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DOI	10.1029/2019GL086746
	Flexure of the Lithosphere Beneath the North Polar Cap of Mars: Implications for Ice Composition and Heat Flow
	Broquet A.; Wieczorek M.A.; Fa W.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:5
英文摘要	The geodynamical response of the lithosphere under stresses imposed by the geologically young north polar cap is one of the few clues we have to constrain both the polar cap composition and the present-day thermal state of Mars. Here we combine radar data with a flexural loading model to self-consistently estimate the density ((Formula presented.)) and real dielectric constant ((Formula presented.)) of the polar cap, and the elastic thickness of the lithosphere underneath ((Formula presented.)). Our results show that (Formula presented.) ranges from 920 to 1,520 kg m (Formula presented.), (Formula presented.) is 2.75 (+0.40, (Formula presented.) 0.35), and (Formula presented.) is between 330 and 450 km. We determine a polar cap volume that is up to 30% larger than current estimates that all neglect lithospheric flexure. Our inferred compositions suggest that, for dust content larger than about 6 vol%, 10 vol% CO (Formula presented.) ice is mixed within the polar deposits, which has important implications for the climate evolution of Mars. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Heat transfer; Current estimates; Elastic thickness; Flexural loading; flexure of the lithosphere; Lithospheric flexure; Mars; North polar cap; Polar deposits; Ice; dielectric property; heat flow; lithosphere; Mars; radar; Calluna vulgaris
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/170629
作者单位	Observatoire de la Côte d'Azur, CNRS, Laboratoire Lagrange, Université Côte d'Azur, Nice, France; Institute of Remote Sensing and Geographical Information System, School of Earth and Space Sciences, Peking University, Beijing, China; State Key Laboratory of Lunar and Planetary Sciences, Macau University of Science and Technology, Macau, China
推荐引用方式 GB/T 7714	Broquet A.,Wieczorek M.A.,Fa W.. Flexure of the Lithosphere Beneath the North Polar Cap of Mars: Implications for Ice Composition and Heat Flow[J],2020,47(5).
APA	Broquet A.,Wieczorek M.A.,&Fa W..(2020).Flexure of the Lithosphere Beneath the North Polar Cap of Mars: Implications for Ice Composition and Heat Flow.Geophysical Research Letters,47(5).
MLA	Broquet A.,et al."Flexure of the Lithosphere Beneath the North Polar Cap of Mars: Implications for Ice Composition and Heat Flow".Geophysical Research Letters 47.5(2020).