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arXiv 2207.09283astro-ph.EP
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火星内部动力学和热演化--地球动力学的观点

Interior Dynamics and Thermal Evolution of Mars -- a Geodynamic Perspective

Ana-Catalina Plesa, Mark Wieczorek, Martin Knapmeyer, Attilio Rivoldini, Michaela Walterova, Doris Breuer

摘要:

在过去的几十年里,全球地球动力学模型已被用来研究类地行星的热演化。随着计算能力的提高和数值技术的改进,这些模型变得更加复杂,模拟现在能够使用高分辨率的3D球壳几何形状,并考虑到强烈变化的粘度,适用于地幔物质。在这项研究中,我们回顾了全球三维地球动力学模型,已被用来研究火星的热演化和内部动力学。我们将讨论如何将这些模型与当地和全球的观测相结合,以约束地球的热历史。特别是,我们使用最近的洞察力估计地壳厚度,上地幔结构和核心大小,以展示这些约束如何与3D地球动力学模型相结合,以提高我们对火星内部动力学,现今热状态和温度变化的理解。

英文摘要:

Over the past decades, global geodynamical models have been used to investigate the thermal evolution of terrestrial planets. With the increase of computational power and improvement of numerical techniques, these models have become more complex, and simulations are now able to use a high resolution 3D spherical shell geometry and to account for strongly varying viscosity, as appropriate for mantle materials. In this study we review global 3D geodynamic models that have been used to study the thermal evolution and interior dynamics of Mars. We discuss how these models can be combined with local and global observations to constrain the planet's thermal history. In particular, we use the recent InSight estimates of the crustal thickness, upper mantle structure, and core size to show how these constraints can be combined with 3D geodynamic models to improve our understanding of the interior dynamics, present-day thermal state and temperature variations in the interior of Mars.

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