A solar wind-derived water reservoir on the Moon hosted by impact glass beads
A solar wind-derived water reservoir on the Moon hosted by impact glass beads
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DOI：
10.1038/s41561-023-01159-6
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发表时间：
2023-03
影响因子：
18.3
通讯作者：
Huicun He;J. Ji;Yue Zhang;Sen Hu;Yangting Lin;Hejiu Hui;J. Hao;Ruiying Li;Wei Yang;H. Tian;Chi Zhang;M. Anand;R. Tartèse;L. Gu;Jinhua Li;Di Zhang;Qian Mao;Lihui Jia;Xiaoguang Li;Yi Chen;Li Zhang;H. Ni;Shitou Wu;Hao Wang;Qiuli Li;Huaiyu He;Xianhua Li;Fu-guan Wu
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文献类型：
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作者：
Huicun He;J. Ji;Yue Zhang;Sen Hu;Yangting Lin;Hejiu Hui;J. Hao;Ruiying Li;Wei Yang;H. Tian;Chi Zhang;M. Anand;R. Tartèse;L. Gu;Jinhua Li;Di Zhang;Qian Mao;Lihui Jia;Xiaoguang Li;Yi Chen;Li Zhang;H. Ni;Shitou Wu;Hao Wang;Qiuli Li;Huaiyu He;Xianhua Li;Fu-guan Wu
过去20年的月球探测已经在月球表面发现了大量的水。有人提出，在月球土壤深处存在一层水合层，缓冲了月球上全球的水循环。然而，这一含水层的储层尚未被确定。在这里，我们报告了从嫦娥五号任务返回的月球土壤中提取的撞击玻璃珠中测量的水的丰度、氢同位素组成和核心到边缘的变化。撞击玻璃微珠保留了水化特征，并显示出与太阳风衍生水向内扩散一致的水丰度剖面。扩散模型估计在360 K温度下的扩散时间尺度小于15年。如此短的扩散时间尺度表明存在一种有效的水补给机制，可以维持月球表面的水循环。我们估计，月球土壤中由撞击玻璃珠承载的水量可能高达2.7 × 1014kg。我们对月球表面水库的直接测量表明，撞击玻璃珠可以在月球上储存大量太阳风产生的水，并表明撞击玻璃可能是其他无空气物体上的水库。
The past two decades of lunar exploration have seen the detection of substantial quantities of water on the Moon’s surface. It has been proposed that a hydrated layer exists at depth in lunar soils, buffering a water cycle on the Moon globally. However, a reservoir has yet to be identified for this hydrated layer. Here we report the abundance, hydrogen isotope composition and core-to-rim variations of water measured in impact glass beads extracted from lunar soils returned by the Chang’e-5 mission. The impact glass beads preserve hydration signatures and display water abundance profiles consistent with the inward diffusion of solar wind-derived water. Diffusion modelling estimates diffusion timescales of less than 15 years at a temperature of 360 K. Such short diffusion timescales suggest an efficient water recharge mechanism that could sustain the lunar surface water cycle. We estimate that the amount of water hosted by impact glass beads in lunar soils may reach up to 2.7 × 1014kg. Our direct measurements of this surface reservoir of lunar water show that impact glass beads can store substantial quantities of solar wind-derived water on the Moon and suggest that impact glass may be water reservoirs on other airless bodies.