气候变化领域集成服务门户(CCPortal): The Ice Content of the Dorsa Argentea Formation From Radar Sounder Data

CCPortal

DOI	10.1029/2020GL090705
	The Ice Content of the Dorsa Argentea Formation From Radar Sounder Data
	Whitten J.L.; Campbell B.A.; Plaut J.J.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:23
英文摘要	The Dorsa Argentea Formation (DAF) is an extensive Hesperian plains unit in the south polar region of Mars that was once ice rich and may still contain a substantial fraction of water ice. Given its 3.5-Ga age, the possibility for massive ice in the DAF has significant implications for the preservation of volatiles during large obliquity changes. Here Mars Advanced Radar for Subsurface and Ionosphere Sounding (MARSIS) and Shallow Radar (SHARAD) sounder data are analyzed to determine whether massive water ice is present at depth by utilizing subsurface DAF reflectors to infer the loss tangent of overlying material. SHARAD (0.005 ± 0.003) and especially MARSIS (0.009 ± 0.006) loss tangent values are closer to those of dry sediment than to equatorial glaciers or the polar caps, but a fraction of remnant ice at depth may occur. Water ice is not the predominant component of the DAF, so much of the ancient ice has been lost during large obliquity changes over the past 3.5 Ga. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	Acoustic devices; Ionosphere; Radar; Water treatment; Dry sediments; Ice content; Loss tangent; Massive ices; Polar cap; Radar sounder; South polar region; Water ice; Ice; ice; Mars; obliquity; polar region; radar imagery; volatile element
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/169324
作者单位	Department of Earth and Environmental Sciences, Tulane University, New Orleans, LA, United States; Center for Earth and Planetary Studies, National Air and Space Museum, Smithsonian Institution, Washington, DC, United States; NASA Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States
推荐引用方式 GB/T 7714	Whitten J.L.,Campbell B.A.,Plaut J.J.. The Ice Content of the Dorsa Argentea Formation From Radar Sounder Data[J],2020,47(23).
APA	Whitten J.L.,Campbell B.A.,&Plaut J.J..(2020).The Ice Content of the Dorsa Argentea Formation From Radar Sounder Data.Geophysical Research Letters,47(23).
MLA	Whitten J.L.,et al."The Ice Content of the Dorsa Argentea Formation From Radar Sounder Data".Geophysical Research Letters 47.23(2020).