气候变化领域集成服务门户(CCPortal): Direct evidence of surface exposed water ice in the lunar polar regions

CCPortal

DOI	10.1073/pnas.1802345115
	Direct evidence of surface exposed water ice in the lunar polar regions
	Li S.; Lucey P.G.; Milliken R.E.; Hayne P.O.; Fisher E.; Williams J.-P.; Hurley D.M.; Elphic R.C.
发表日期	2018
ISSN	0027-8424
起始页码	8907
结束页码	8912
卷号	115 期号:36
英文摘要	Water ice may be allowed to accumulate in permanently shaded regions on airless bodies in the inner solar system such as Mercury, the Moon, and Ceres [Watson K, et al. (1961) J Geophys Res 66:3033–3045]. Unlike Mercury and Ceres, direct evidence for water ice exposed at the lunar surface has remained elusive. We utilize indirect lighting in regions of permanent shadow to report the detection of diagnostic near-infrared absorption features of water ice in reflectance spectra acquired by the Moon Mineralogy Mapper [M (3)] instrument. Several thousand M (3) pixels (∼280 × 280 m) with signatures of water ice at the optical surface (depth of less than a few millimeters) are identified within 20° latitude of both poles, including locations where independent measurements have suggested that water ice may be present. Most ice locations detected in M (3) data also exhibit lunar orbiter laser altimeter reflectance values and Lyman Alpha Mapping Project instrument UV ratio values consistent with the presence of water ice and also exhibit annual maximum temperatures below 110 K. However, only ∼3.5% of cold traps exhibit ice exposures. Spectral modeling shows that some ice-bearing pixels may contain ∼30 wt % ice that is intimately mixed with dry regolith. The patchy distribution and low abundance of lunar surface-exposed water ice might be associated with the true polar wander and impact gardening. The observation of spectral features of H2O confirms that water ice is trapped and accumulates in permanently shadowed regions of the Moon, and in some locations, it is exposed at the modern optical surface. © 2018 National Academy of Sciences. All Rights Reserved.
英文关键词	Lunar polar regions; Lunar water ice; Moon mineralogy mapper; Near-infrared spectroscopy; Permanently shaded regions
语种	英语
scopus关键词	ice; absorption; Article; environmental monitoring; gardening; illumination; mineralogy; moon; near infrared reflectance spectroscopy; priority journal; signal noise ratio; simulation; surface water hydrology; topography; water analysis; water temperature
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/160470
作者单位	Li, S., Department of Geology and Geophysics, University of Hawaii, Honolulu, HI 96822, United States, Department of Earth, Environmental and Planetary Sciences, Brown University, Providence, RI 02912, United States; Lucey, P.G., Department of Geology and Geophysics, University of Hawaii, Honolulu, HI 96822, United States; Milliken, R.E., Department of Earth, Environmental and Planetary Sciences, Brown University, Providence, RI 02912, United States; Hayne, P.O., Department of Astrophysical and Planetary Sciences, University of Colorado Boulder, Boulder, CO 80309, United States; Fisher, E., Department of Earth, Environmental and Planetary Sciences, Brown University, Providence, RI 02912, United States; Williams, J.-P., Department of Earth, Planetary, and Space Sciences, University of California, Los Angeles, CA 90095, United States; Hurley, D.M., Applied Physics Laboratory, Johns Hopkins University, Laurel, MD 20723, United States; Elphic, R.C., Ames Research Center, NASA, Mountain View, CA 94035...
推荐引用方式 GB/T 7714	Li S.,Lucey P.G.,Milliken R.E.,et al. Direct evidence of surface exposed water ice in the lunar polar regions[J],2018,115(36).
APA	Li S..,Lucey P.G..,Milliken R.E..,Hayne P.O..,Fisher E..,...&Elphic R.C..(2018).Direct evidence of surface exposed water ice in the lunar polar regions.Proceedings of the National Academy of Sciences of the United States of America,115(36).
MLA	Li S.,et al."Direct evidence of surface exposed water ice in the lunar polar regions".Proceedings of the National Academy of Sciences of the United States of America 115.36(2018).