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首页> 外文期刊>International Journal of Geophysics >Superrotation of Earth’s Inner Core, Extraterrestrial Impacts, and the Effective Viscosity of Outer Core
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Superrotation of Earth’s Inner Core, Extraterrestrial Impacts, and the Effective Viscosity of Outer Core

机译：地球内核的超旋转，地球外的影响以及外核的有效粘度

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摘要

The recently verified superrotation of Earth’s inner core is examined and a new model is presented which is based on the tidal despinning of the mantle and the viscosity of the outer core. The model also takes into account other damping mechanisms arising from the inner core superrotation such as magnetic and gravitational coupling as well as contribution from eddy viscosity in the outer core. The effective viscosity obtained in this model confirms a previously well constrained value of about 103 Pa s. In addition, the model shows that the currently measured superrotation of the inner core must be almost exactly equal to its asymptotic or steady-state value. The effect of extraterrestrial impacts is also investigated, and it is shown that perturbations due to such impacts can only persist over a short geological time.
机译：研究人员最近验证了地球内核的超旋转，并提出了一种基于地幔的潮汐旋流和外核的黏度的新模型。该模型还考虑了由内芯超旋转引起的其他阻尼机制，例如磁耦合和重力耦合，以及外芯中涡流粘度的贡献。在该模型中获得的有效粘度证实了先前的良好约束值约为103 Pa·s。此外，该模型还表明，当前测得的内核超旋转必须几乎完全等于其渐近或稳态值。还研究了地外影响的影响，结果表明，由于这种影响而引起的扰动只能持续很短的地质时间。

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