globalchange  > 气候变化与战略
DOI: 10.1073/pnas.1802345115
论文题名:
Direct evidence of surface exposed water ice in the lunar polar regions
作者: Li S.; Lucey P.G.; Milliken R.E.; Hayne P.O.; Fisher E.; Williams J.-P.; Hurley D.M.; Elphic R.C.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2018
卷: 115, 期:36
起始页码: 8907
结束页码: 8912
语种: 英语
英文关键词: Lunar polar regions ; Lunar water ice ; Moon mineralogy mapper ; Near-infrared spectroscopy ; Permanently shaded regions
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
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.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/163666
Appears in Collections:气候变化与战略

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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, United States

Recommended Citation:
Li S.,Lucey P.G.,Milliken R.E.,et al. Direct evidence of surface exposed water ice in the lunar polar regions[J]. Proceedings of the National Academy of Sciences of the United States of America,2018-01-01,115(36)
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