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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Postglacial sealevels on a spherical, self-gravitating viscoelastic earth: effects of lateral viscosity variations in the upper mantle on the inference of viscosity contrasts in the lower mantle
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Postglacial sealevels on a spherical, self-gravitating viscoelastic earth: effects of lateral viscosity variations in the upper mantle on the inference of viscosity contrasts in the lower mantle

机译：球形自重粘弹性地球上的冰川后海平面：上地幔的侧向黏度变化对下地幔的黏度对比的影响

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摘要

Previous studies of lateral viscosity variations on postglacial rebound often neglect the spherical shape of the Earth and the self-gravity of the solid earth and oceans. In this paper, the consistent sealevel equation is solved by the coupled Laplace-finite element method for a spherical, self-gravitating incompressible Maxwell earth. It confirms the importance of self-gravity in the oceans on sealevel computation near the ice margin where the date are most sensitive to the existence of lateral variations in lithospheric thickness and asthenospheric viscosity. The effects of lateral variations in lower mantle viscosity, asthenospheric viscosity and lithospheric thickness are investigated. This paper confirms the finding of earlier investigations. The combined effect of lateral viscosity variations in the lower mantle with reverse viscosity contrasts in the upper mantle is also investigated. For sealevel data near the center of rebound, the effect of lateral viscosity contrast in the lower mantle can be masked by the existence of reverse lateral viscosity contrasts in the upper mantle. However, this is not the case for sealevel data just outside the ice margin.
机译：先前关于冰川后回弹的侧向黏度变化的研究通常忽略了地球的球形以及固体地球和海洋的自重。在本文中，通过耦合的拉普拉斯有限元方法对球形自重不可压缩的麦克斯韦地球求解一致的海平面方程。它证实了在冰缘附近海平面进行海平面计算时，海洋自重的重要性，在该日期，日期对岩石圈厚度和软流圈黏度的横向变化的存在最为敏感。研究了横向变化对下地幔粘度，软流圈粘度和岩石圈厚度的影响。本文证实了早期调查的发现。还研究了下地幔横向粘度变化与上地幔反向粘度对比的综合作用。对于反弹中心附近的海平面数据，下地幔中横向粘度对比的影响可以通过上地幔中存在反向横向粘度对比来掩盖。但是，对于冰边界以外的海平面数据却不是这种情况。

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