气候变化领域集成服务门户(CCPortal): Thick ice deposits in shallow simple craters on the Moon and Mercury

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DOI	10.1038/s41561-019-0405-8
	Thick ice deposits in shallow simple craters on the Moon and Mercury
	Rubanenko L.; Venkatraman J.; Paige D.A.
发表日期	2019
ISSN	17520894
卷号	12 期号:8
英文摘要	Permanently shadowed regions near the poles of Mercury and the Moon may cold-trap water ice for geologic time periods. In past studies, thick ice deposits have been detected on Mercury, but not on the Moon, despite their similar thermal environments. Here we report evidence for thick ice deposits inside permanently shadowed simple craters on both Mercury and the Moon. We measure the depth/diameter ratio of approximately 2,000 simple craters near the north pole of Mercury using Mercury Laser Altimeter data. We find that these craters become distinctly shallower at higher latitudes, where ice is known to have accumulated on their floors. This shallowing corresponds to a maximum infill of around 50 m, consistent with previous estimates. A parallel investigation of approximately 12,000 lunar craters using Lunar Reconnaissance Orbiter data reveals a similar morphological trend near the south pole of the Moon, which we conclude is also due to the presence of thick ice deposits. We find that previously detected surface ice deposits in the south polar region of the Moon are spatially correlated with shallow craters, indicating that the surface ice may be exhumed or linked to the subsurface via diffusion. The family of lunar craters that we identify are promising targets for future missions, and may also help resolve the apparent discrepancy between the abundance of frozen volatiles on Mercury and the Moon. © 2019, The Author(s), under exclusive licence to Springer Nature Limited.
语种	英语
scopus关键词	altimeter; crater; geological time; geomorphology; ice drift; laser method; latitudinal gradient; lunar phase; Mercury (planet); Moon; polar region
来源期刊	Nature Geoscience
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/124627
作者单位	Department of Earth, Planetary and Space Sciences, University of California, Los Angeles, CA, United States
推荐引用方式 GB/T 7714	Rubanenko L.,Venkatraman J.,Paige D.A.. Thick ice deposits in shallow simple craters on the Moon and Mercury[J],2019,12(8).
APA	Rubanenko L.,Venkatraman J.,&Paige D.A..(2019).Thick ice deposits in shallow simple craters on the Moon and Mercury.Nature Geoscience,12(8).
MLA	Rubanenko L.,et al."Thick ice deposits in shallow simple craters on the Moon and Mercury".Nature Geoscience 12.8(2019).