摘要
太阳辐射是影响月表热环境的主要因素,前人的研究大多忽略月表地形的影响或仅考虑大尺度的地形起伏.本文以Banting简单陨坑(16.4°E, 26.6°N)为例,首先基于月球勘探轨道器(LRO)搭载的月球轨道器激光测高仪获取的地形数据构建了该陨坑的三维数值模型,计算了不同地方时条件下的有效太阳辐照度分布.其次,本文以具有Banting陨坑相同深径比的陨坑为研究对象,计算了其在月表任意位置和时刻的光照面积占陨坑面积的分布(光照面积占比).结果表明,在48.2°N/S和当地时间08:48–15:12的时空范围内,陨坑的光照面积占比达100%.最后,根据月表热辐射平衡模型计算了Banting陨坑在白天不同时刻的温度分布.通过与LRO月球辐射实验仪的测量温度对比,二者表现出较好的一致性,验证了数值模拟的可靠性.
Solar radiation plays an important part in lunar surface thermal environment. The topographic effect was usually ignored in previous work, which might cause great uncertainties in surface temperature simulation. To better understand the surface temperatures of the craters at any time and on any location of the Moon, we simulated the effective solar irradiance and temperatures of the Banting crater as an example. In this work, we firstly constructed a three-dimensional Banting crater(16.4?E, 26.6?N) model based on the elevation data obtained from the Lunar Orbiter Laser Altimeter onboard Lunar Reconnaissance Orbiter(LRO), and then calculated the distribution of the effective solar irradiance at different local times. In addition, we calculated the distribution of percentage of illuminated area of the Banting-like craters at any day time and on all locations of the Moon. These results show that the craters located within 48.2?N/S and at the time of 08:48–15:12 are illuminated without any self-shading, while that located at high latitudes or near to dawn/dusk endure different degrees of the self-shading effect. Finally, we simulated the temperatures of the Banting crater at different local times based on the surface radiation balance. Compared to the temperatures measured by Diviner aboard LRO, the results show that the simulated temperatures are well consistent with the Diviner observations, which verified our models and simulation results.
引文
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