钟振, 张腾, 段炼, 李毅, 朱化强. 应用重力场模型GL1500E和LLR天平动参数估算月核大小及其组成[J]. 武汉大学学报 ( 信息科学版), 2021, 46(2): 238-243. DOI: 10.13203/j.whugis20190124
引用本文: 钟振, 张腾, 段炼, 李毅, 朱化强. 应用重力场模型GL1500E和LLR天平动参数估算月核大小及其组成[J]. 武汉大学学报 ( 信息科学版), 2021, 46(2): 238-243. DOI: 10.13203/j.whugis20190124
ZHONG Zhen, ZHANG Teng, DUAN Lian, LI Yi, ZHU Huaqiang. Estimation of the Size and Composition of the Lunar Core Based on the Gravity Field Model GL1500E and LLR Physical Libration Parameters[J]. Geomatics and Information Science of Wuhan University, 2021, 46(2): 238-243. DOI: 10.13203/j.whugis20190124
Citation: ZHONG Zhen, ZHANG Teng, DUAN Lian, LI Yi, ZHU Huaqiang. Estimation of the Size and Composition of the Lunar Core Based on the Gravity Field Model GL1500E and LLR Physical Libration Parameters[J]. Geomatics and Information Science of Wuhan University, 2021, 46(2): 238-243. DOI: 10.13203/j.whugis20190124

应用重力场模型GL1500E和LLR天平动参数估算月核大小及其组成

Estimation of the Size and Composition of the Lunar Core Based on the Gravity Field Model GL1500E and LLR Physical Libration Parameters

  • 摘要: 针对月核大小及密度估计问题, 利用高分辨率重力场模型GL1500E的二阶位系数和LLR(lunar laser ranging)天平动参数, 考虑月核分层为外核和内核的情况, 结合非线性粒子群优化算法, 对月核大小和组成进行了估计。大批量的统计结果表明, 大概率分布的外核半径rc1约为469 km, 内核半径rc2约为303 km, 外核密度ρc1约为4 613 kg/m3, 内核密度ρc2约为7 004 kg/m3, 月幔密度ρm约为3 340 kg/m3。月幔密度非常接近地质研究结果3 360 kg/m3, 内外核半径与近期其他研究结果相近, 估算的月核大小与密度组成具有一定的参考价值。若月核由纯铁和硫化亚铁组成, 则研究表明, 内核大部分由纯铁组成, 外核大部分由硫化亚铁组成。

     

    Abstract: The lunar core is stratified into an outer core and an inner core. They can be estimated according to the second degree of gravity field model and selenophysical libration parameters from lunar laser ranging (LLR). We use the high-resolution lunar gravity field model GL1500E to evaluate the size and density of lunar core, which are inversed through a nonlinear particle swarm optimization. A large number of inversion indicates that, the outer diameter of the outer core is about 469 km with a corresponding density of 4 613 kg/m3, the radius of the inner core is around 303 km with a corresponding density of 7 004 kg/m3 and the density of mantle surrounds 3 340 kg/m3, which is quite close to the geological value of 3 360 kg/m3. The radii of inner core and outer core are quite close to other recent studies as well. The size and density of the lunar core found here can be therefore meaningful. If the lunar core is composed of pure iron and ferrous sulfide, our study shows that the inner core is mainly composed of pure iron whereas the outer core is largely composed of ferrous sulfide.

     

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