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Widespread distribution of OH/H 2 O on the lunar surface inferred from spectral data
Nature Geoscience ( IF 15.7 ) Pub Date : 2018-02-12 , DOI: 10.1038/s41561-018-0065-0
Joshua L. Bandfield , Michael J. Poston , Rachel L. Klima , Christopher S. Edwards

Remote-sensing data from lunar orbiters have revealed spectral features consistent with the presence of OH or H2O on the lunar surface. Analyses of data from the Moon Mineralogy Mapper spectrometer onboard the Chandrayaan-1 spacecraft have suggested that OH/H2O is recycled on diurnal timescales and persists only at high latitudes. However, the spatial distribution and temporal variability of the OH/H2O, as well as its source, remain uncertain. Here we incorporate a physics-based thermal correction into analysis of reflectance spectra from the Moon Mineralogy Mapper and find that prominent absorption features consistent with OH/H2O can be present at all latitudes, local times and surface types examined. This suggests the widespread presence of OH/H2O on the lunar surface without significant diurnal migration. We suggest that the spectra are consistent with the production of OH in space-weathered materials by the solar wind implantation of H+ and formation of OH at crystal defect sites, as opposed to H2O sourced from the lunar interior. Regardless of the specific composition or formation mechanism, we conclude that OH/H2O can be present on the Moon under thermal conditions more wide-ranging than previously recognized.



中文翻译:

根据光谱数据推断,OH / H 2 O在月球表面的广泛分布

来自月球轨道器的遥感数据揭示了与月球表面上存在OH或H 2 O一致的光谱特征。对Chandrayaan-1航天器上的Moon Mineralogy Mapper光谱仪进行的数据分析表明,OH / H 2 O在昼夜时间尺度上被回收,并且仅在高纬度地区持续存在。然而,OH / H 2 O的空间分布和时间变异性及其来源仍然不确定。在这里,我们将基于物理学的热校正方法整合到了Moon Mineralogy Mapper的反射光谱分析中,发现与OH / H 2一致的突出吸收特征在所检查的所有纬度,当地时间和地表类型中都可以存在O。这表明在月球表面普遍存在OH / H 2 O,而没有明显的日间迁移。我们认为,该光谱与通过太阳风注入H +以及在晶体缺陷部位形成OH而在空间风化材料中生成OH相一致,这与从月球内部获取的H 2 O相反。不管具体的组成或形成机理如何,我们得出的结论是,OH / H 2 O可以在比以前公认的范围更广的热条件下存在于月球上。

更新日期:2018-03-17
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