Quillen Alice C, Martini Larkin, Nakajima Miki
Department of Physics and Astronomy, University of Rochester, Rochester, NY 14627, USA.
Department of Geology and Geological Engineering, Colorado School of Mines, Golden, CO 80401, USA.
Icarus. 2019 Sep 1;329:182-196. doi: 10.1016/j.icarus.2019.04.010. Epub 2019 Apr 15.
Using viscoelastic mass spring model simulations to track heat distribution inside a tidally perturbed body, we measure the near/far side asymmetry of heating in the crust of a spin synchronous Moon in eccentric orbit about the Earth. With the young Moon within. 8 Earth radii of the Earth, we find that tidal heating per unit area in a lunar crustal shell is asymmetric due to the octupole order moment in the Earth's tidal field and is 10 to 20% higher on its near side than on its far side. Tidal heating reduces the crustal basal heat flux and the rate of magma ocean crystallization. Assuming that the local crustal growth rate depends on the local basal heat flux and the distribution of tidal heating in latitude and longitude, a heat conductivity model illustrates that a moderately asymmetric and growing lunar crust could maintain its near/far side thickness asymmetry but only while the Moon is near the Earth.
利用粘弹性质量弹簧模型模拟来追踪潮汐扰动天体内部的热分布，我们测量了在围绕地球的偏心轨道上自旋同步的月球地壳中加热的近/远侧不对称性。对于距离地球在8个地球半径范围内的年轻月球，我们发现由于地球潮汐场中的八极矩，月球地壳壳层中单位面积的潮汐加热是不对称的，其近侧比远侧高10%到20%。潮汐加热降低了地壳底部热通量和岩浆海洋结晶速率。假设当地地壳生长速率取决于当地底部热通量以及潮汐加热在纬度和经度上的分布，一个热传导模型表明，一个适度不对称且不断生长的月球地壳可以维持其近/远侧厚度不对称性，但前提是月球靠近地球。
