Abstract

Changes in the Earth’s rotation are deeply connected to fluid dynamical processes in the outer core. This connection can be explored by studying the associated Earth eigenmodes with periods ranging from nearly diurnal to multi-decadal. It is essential to understand how the rotational and fluid core eigenmodes mutually interact, as well as their dependence on a host of diverse factors, such as magnetic effects, density stratification, fluid instabilities or turbulence. It is feasible to build detailed models including many of these features, and doing so will in turn allow us to extract more (indirect) information about the Earth’s interior. In this article, we present a review of some of the current models, the numerical techniques, their advantages and limitations and the challenges on the road ahead.

中文翻译：

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核心本征模态及其对地球自转的影响

 抽象的

地球自转的变化与外核的流体动力学过程密切相关。这种联系可以通过研究相关的地球本征模来探索，其周期范围从近日到数十年。必须了解旋转和流体核心本征模式如何相互作用，以及它们对许多不同因素的依赖性，例如磁效应、密度分层、流体不稳定性或湍流。建立包含许多这些特征的详细模型是可行的，这样做反过来将使我们能够提取更多有关地球内部的（间接）信息。在本文中，我们回顾了当前的一些模型、数值技术、它们的优点和局限性以及未来的挑战。