月壤热物性特征及其剖面温度垂直分布模拟
发布时间：2018-10-10 17:01
【摘要】：长时间序列的太阳总辐射(TSI)记录是研究太阳活动驱动全球气候变化机制的重要基础。由于月球表层没有大气圈的屏障、水圈的调节和生物圈的影响,太阳辐射对月壤直接产生加热作用。因此,月壤温度剖面可作为反演TSI记录的直接证据,而月基平台的TSI重建则有赖于明确月壤温度剖面的变化规律。 月壤剖面垂直温度分布主要与月壤物质的热物性有关。本研究利用热传导性能测试仪器TPS2500S对月壤物质的热物性进行测试,包括3种月壤主要矿物(辉石、橄榄石、斜长石)的6种不同粒级的地球矿物粉末样品,以及中国、美国、日本3国所研制的模拟月壤样品,获取了可靠的月壤物质热物性实测数据,分析了矿物组成、颗粒特性、温度等因素对月壤热物性的影响,一方面为探月相关领域积累基础数据,另一方面也是月壤温度剖面模型的重要输入参数。研究表明,月壤主要矿物导热系数和热容总体上均表现出随矿物颗粒粒径的增加而上升的变化特征,而热扩散系数则呈现相反的变化趋势；不同矿物的变化规律有所差异。不同模拟月壤热物性特征较为接近,均属低热导材料,其导热系数与粒径大小具有正相关关系；随温度的升高,其热传输能力增强,热物性随温度升高所引起的变幅趋于减小。 月壤温度剖面是随深度和时间变化的函数。本研究从热传导理论出发,利用月壤温度剖面模型,编写计算机程序进行数值运算,模拟了不同时段、不同月面纬度的月壤温度剖面,并以虹湾作为特征地区模拟其月壤剖面温度垂直分布特征；同时,对影响月壤剖面温度垂直分布规律的因素进行了分析,包括矿物组成、颗粒特性、模拟月壤及其所引起的热物性特征,以及月球内部热流等。研究表明,月壤温度剖面在白昼期间表现为由表层往深层传导热量,夜晚期间的情况则相反；剖面温度昼夜变幅由表层往深层逐渐减小,至0.5-0.6m以下基本保持恒温；月壤剖面温度垂直变幅由低纬度往高纬度逐渐减小；导热系数大的矿物组成、颗粒粒径、模拟月壤,其月壤剖面中的垂直温度梯度更大。 在此基础上,对研究中存在的问题进行了分析,并对后续研究进行展望,即从机制上把握月壤剖面温度垂直变化规律,剔除非太阳辐射强迫所引起的噪音,将其作为直接证据反演过去更长时间尺度的TSI序列；形成m级精度以上的月球表面温度分布模型和月壤温度剖面模型。
[Abstract]:The (TSI) records of solar total radiation in long time series are the important basis for studying the mechanism of global climate change driven by solar activity. Because there is no atmospheric barrier on the surface of the moon, the regulation of hydrosphere and the influence of biosphere, solar radiation directly heats the lunar soil. Therefore, the lunar soil temperature profile can be used as direct evidence for retrieving the TSI records, and the TSI reconstruction of the lunar platform depends on the understanding of the variation law of the lunar soil temperature profile. The vertical temperature distribution of lunar soil is mainly related to the thermal properties of lunar soil. In this study, the thermal properties of lunar soil were measured by TPS2500S, including 6 kinds of earth mineral powder samples of three major minerals (pyroxene, olivine, plagioclase), as well as China and the United States. The simulated lunar soil samples developed by three countries in Japan have obtained reliable measured data on the thermal properties of lunar soil, and analyzed the effects of mineral composition, particle characteristics and temperature on the thermal properties of lunar soil. On the one hand, it accumulates the basic data in the related fields of lunar exploration, on the other hand, it is an important input parameter of the temperature profile model of lunar soil. The results show that the thermal conductivity and heat capacity of the main minerals in the lunar soil generally show the characteristics of increasing with the increase of the particle size, while the thermal diffusion coefficient shows the opposite trend, and the variation law of different minerals is different. The thermal properties of different simulated lunar soils are similar and belong to low thermal conductivity materials, and their thermal conductivity is positively correlated with the size of particle size, and the heat transfer capacity increases with the increase of temperature, and the amplitude of variation caused by the increase of temperature tends to decrease. The temperature profile of lunar soil is a function of variation with depth and time. Based on the theory of heat conduction and the model of lunar soil temperature profile, a computer program is compiled to simulate the temperature profile of lunar soil in different periods and different latitudes of lunar surface. The vertical temperature distribution in the lunar soil profile was simulated by using Hongwan as the characteristic area, and the factors influencing the vertical temperature distribution in the lunar soil profile were analyzed, including the mineral composition and particle characteristics. Simulation of lunar soil and its thermal properties, as well as the interior heat flow of the moon. The results show that the temperature profile of the lunar soil shows heat transfer from the surface to the deep layer during the day and the contrary during the night, and the diurnal variation of the temperature decreases gradually from the surface layer to the deep layer, and keeps the constant temperature below 0.5-0.6 m. The vertical temperature range of lunar soil profile gradually decreases from low latitude to high latitude, and the vertical temperature gradient in lunar soil profile is larger for mineral composition with large thermal conductivity, particle size and simulated lunar soil. On this basis, the existing problems in the study are analyzed, and the future research is prospected, that is, to grasp the vertical variation law of the temperature in the lunar soil profile from the mechanism, and to eliminate the noise caused by the non-solar radiation forcing. It is used as direct evidence to invert the TSI series of the past longer time scale and to form the lunar surface temperature distribution model and lunar soil temperature profile model with more than m-order accuracy.
【学位授予单位】：华东师范大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：P184
[Abstract]:The (TSI) records of solar total radiation in long time series are the important basis for studying the mechanism of global climate change driven by solar activity. Because there is no atmospheric barrier on the surface of the moon, the regulation of hydrosphere and the influence of biosphere, solar radiation directly heats the lunar soil. Therefore, the lunar soil temperature profile can be used as direct evidence for retrieving the TSI records, and the TSI reconstruction of the lunar platform depends on the understanding of the variation law of the lunar soil temperature profile. The vertical temperature distribution of lunar soil is mainly related to the thermal properties of lunar soil. In this study, the thermal properties of lunar soil were measured by TPS2500S, including 6 kinds of earth mineral powder samples of three major minerals (pyroxene, olivine, plagioclase), as well as China and the United States. The simulated lunar soil samples developed by three countries in Japan have obtained reliable measured data on the thermal properties of lunar soil, and analyzed the effects of mineral composition, particle characteristics and temperature on the thermal properties of lunar soil. On the one hand, it accumulates the basic data in the related fields of lunar exploration, on the other hand, it is an important input parameter of the temperature profile model of lunar soil. The results show that the thermal conductivity and heat capacity of the main minerals in the lunar soil generally show the characteristics of increasing with the increase of the particle size, while the thermal diffusion coefficient shows the opposite trend, and the variation law of different minerals is different. The thermal properties of different simulated lunar soils are similar and belong to low thermal conductivity materials, and their thermal conductivity is positively correlated with the size of particle size, and the heat transfer capacity increases with the increase of temperature, and the amplitude of variation caused by the increase of temperature tends to decrease. The temperature profile of lunar soil is a function of variation with depth and time. Based on the theory of heat conduction and the model of lunar soil temperature profile, a computer program is compiled to simulate the temperature profile of lunar soil in different periods and different latitudes of lunar surface. The vertical temperature distribution in the lunar soil profile was simulated by using Hongwan as the characteristic area, and the factors influencing the vertical temperature distribution in the lunar soil profile were analyzed, including the mineral composition and particle characteristics. Simulation of lunar soil and its thermal properties, as well as the interior heat flow of the moon. The results show that the temperature profile of the lunar soil shows heat transfer from the surface to the deep layer during the day and the contrary during the night, and the diurnal variation of the temperature decreases gradually from the surface layer to the deep layer, and keeps the constant temperature below 0.5-0.6 m. The vertical temperature range of lunar soil profile gradually decreases from low latitude to high latitude, and the vertical temperature gradient in lunar soil profile is larger for mineral composition with large thermal conductivity, particle size and simulated lunar soil. On this basis, the existing problems in the study are analyzed, and the future research is prospected, that is, to grasp the vertical variation law of the temperature in the lunar soil profile from the mechanism, and to eliminate the noise caused by the non-solar radiation forcing. It is used as direct evidence to invert the TSI series of the past longer time scale and to form the lunar surface temperature distribution model and lunar soil temperature profile model with more than m-order accuracy.
【学位授予单位】：华东师范大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：P184
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