Higher water content observed in smaller size fraction of Chang’e-5 lunar regolith samples  

细粒月壤中含有更高含量的水

作　　者：Honglei Lin Rui Xu Shuai Li Rui Chang Hejiu Hui Yang Liu Hengci Tian Kai Fan Zhiping He Huaiyu He Wei Yang Yangting Lin Yong Wei 林红磊;徐睿;李帅;常睿;惠鹤九;刘洋;田恒次;范开;何志平;贺怀宇;杨蔚;林杨挺;魏勇

机构地区：[1]Key Laboratory of Earth and Planetary Physics,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China [2]Key Laboratory of Space Active Opto-Electronics Technology,Shanghai Institute of Technical Physics,Chinese Academy of Sciences,Shanghai 200083,China [3]Hawaii Institute of Geophysics and Planetology,University of Hawai‘i at MaÅnoa,Honolulu,HI 96822,USA [4]State Key Laboratory for Mineral Deposits Research and Lunar and Planetary Science Institute,School of Earth Sciences and Engineering,Nanjing University,Nanjing 210023,China [5]State Key Laboratory of Space Weather,National Space Science Center,Chinese Academy of Sciences,Beijing 100190,China

出　　处：《Science Bulletin》2024年第23期3723-3729,共7页科学通报(英文版)

基　　金：supported by the National Natural Science Foundation of China(42241106,42230206);the Key Research Program of the Institute of Geology and Geophysics;Chinese Academy of Sciences(IGGCAS-202101);the Young Elite Scientists Sponsorship Program by China Association for Science and Technology(2021QNRC001);the Youth Innovation Promotion Association of the Chinese Academy of Sciences(2023071)。

摘　　要：Water has been detected in lunar regolith,with multiple sources identified through the analysis of individual grains.However,the primary origin of water in the bulk lunar regolith remains uncertain.This study presents spectroscopic analyses of water content in sealed Chang’e-5 samples.These samples were sieved into various size fractions(bulk,<45μm,and 45–355μm)inside a glovebox filled with high-purity nitrogen.Results indicate a higher water content in the fine fractions(~87±11.9 ppm)than in bulk soil(~37±4.8 ppm)and coarse fractions(~11±1.5 ppm).This suggests that water is predominantly concentrated in the outermost rims of the regolith grains,and thus exhibits dependence on the surface volume ratio(also known as surface correlation),indicating solar wind is a primary source of lunar surface water.Laboratory,in-situ,and orbital results bridge sample analysis and remote sensing,offering a cohesive understanding of lunar surface water characteristics as represented by Chang’e-5.The discovery provides statistical evidence for the origin of water in lunar soil and can be considered representative of the lunar surface conditions.The water enrichment of the finest fraction suggests the feasibility of employing size sorting of lunar soils as a potential technological approach for water resource extraction in future lunar research stations.

关 键 词：Chang’e-5 sample Water Solar wind SIZE-DEPENDENT SPECTRA 

分 类 号：P18[天文地球—天文学]