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Thermal Conductivity of the Martian Soil at the InSight Landing Site From HP3 Active Heating Experiments
Journal of Geophysical Research: Planets ( IF 4.8 ) Pub Date : 2021-06-29 , DOI: 10.1029/2021je006861
M. Grott 1 , T. Spohn 1, 2 , J. Knollenberg 1 , C. Krause 3 , T. L. Hudson 4 , S. Piqueux 4 , N. Müller 1 , M. Golombek 4 , C. Vrettos 5 , E. Marteau 4 , S. Nagihara 6 , P. Morgan 7 , J. P. Murphy 8 , M. Siegler 9, 10 , S. D. King 8 , S. E. Smrekar 4 , W. B. Banerdt 4
Affiliation  

The heat flow and physical properties package (HP3) of the InSight Mars mission is an instrument package designed to determine the martian planetary heat flow. To this end, the package was designed to emplace sensors into the martian subsurface and measure the thermal conductivity as well as the geothermal gradient in the 0–5 m depth range. After emplacing the probe to a tip depth of 0.37 m, a first reliable measurement of the average soil thermal conductivity in the 0.03–0.37 m depth range was performed. Using the HP3 mole as a modified line heat source, we determined a soil thermal conductivity of 0.039 ± 0.002 W m−1 K−1, consistent with the results of orbital and in-situ thermal inertia estimates. This low thermal conductivity implies that 85%–95% of all particles are smaller than 104–173 μm and suggests that soil cementation is minimal, contrary to the considerable degree of cementation suggested by image data. Rather, cementing agents like salts could be distributed in the form of grain coatings instead. Soil densities compatible with the measurements are urn:x-wiley:21699097:media:jgre21692:jgre21692-math-0001 kg m−3, indicating soil porosities of urn:x-wiley:21699097:media:jgre21692:jgre21692-math-0002%.

中文翻译:

来自 HP3 主动加热实验的 InSight 着陆点火星土壤的热导率

InSight Mars 任务的热流和物理特性包 (HP 3 ) 是一个仪器包,旨在确定火星行星热流。为此,该封装旨在将传感器安装到火星地下并测量 0-5 m 深度范围内的热导率和地温梯度。将探头放置到 0.37 m 的尖端深度后,对 0.03-0.37 m 深度范围内的平均土壤热导率进行了第一次可靠的测量。使用 HP 3摩尔作为改进的线热源,我们确定土壤热导率为 0.039 ± 0.002 W m -1  K -1,与轨道和原位热惯性估计的结果一致。这种低导热性意味着85%-95所有颗粒的%小于104-173  μ m和表明土壤胶结是最小的,相反于由图像数据显示的相当程度的胶结。相反,像盐这样的胶结剂可以以颗粒涂层的形式分布。与测量相符的土壤密度为urn:x-wiley:21699097:media:jgre21692:jgre21692-math-0001kg m -3,表示土壤孔隙率为urn:x-wiley:21699097:media:jgre21692:jgre21692-math-0002%。
更新日期:2021-07-15
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