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Implications of surface roughness in models of water desorption on the Moon
Monthly Notices of the Royal Astronomical Society ( IF 4.8 ) Pub Date : 2021-05-18 , DOI: 10.1093/mnras/stab1360
Björn J R Davidsson 1 , Sona Hosseini 1
Affiliation  

The observed presence of water molecules in the dayside lunar regolith was an unexpected discovery and remains poorly understood. Standard thermophysical models predict temperatures that are too high for adsorbed water to be stable. We propose that this problem can be caused by the assumption of locally flat surfaces that is common in such models. Here, we apply a model that explicitly considers surface roughness, and accounts for solar illumination, shadows cast by topography, self-heating, thermal reradiation, and heat conduction. We couple the thermophysical model to a model of first-order desorption of lunar surface water and demonstrate that surface roughness substantially increases the capability of the Moon to retain water on its sunlit hemisphere at any latitude, and within 45○ of the poles, at any time of the lunar day. Hence, we show that lunar surface roughness has a strong influence on lunar water adsorption and desorption. Therefore, it is of critical importance to take account of surface roughness to get an accurate picture of the amount of water on the Moon’s surface and in its exosphere.

中文翻译:

表面粗糙度对月球水解吸模型的影响

在白天的月球风化层中观察到水分子的存在是一个意外的发现,并且仍然知之甚少。标准热物理模型预测温度太高以至于吸附水无法稳定。我们提出这个问题可能是由此类模型中常见的局部平坦表面假设引起的。在这里,我们应用了一个明确考虑表面粗糙度的模型,并考虑了太阳光照、地形投射的阴影、自热、热再辐射和热传导。我们将热物理模型与月球表面水的一阶解吸模型相结合,并证明表面粗糙度显着提高了月球在任何纬度和两极 45° 范围内将水保留在任何纬度的能力。农历一天的时间。因此,我们表明,月球表面粗糙度对月球水的吸附和解吸有很大的影响。因此,考虑表面粗糙度以准确了解月球表面及其外逸层中的水量至关重要。
更新日期:2021-05-18
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