On the resolution of density within the Earth
On the resolution of density within the Earth
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DOI：
10.1016/j.pepi.2003.07.008
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发表时间：
2003-11-28
影响因子：
2.3
通讯作者：
Gubbins, D
中科院分区：
文献类型：
--
作者：
Masters, G;Gubbins, D
自上次发表地球内部密度线性分辨率计算以来，已经过去了大约 30 年。从那时起，考虑到 3D 结构造成的分裂和耦合的偏置效应，自由振荡简并频率的数据集已被完全重新估计。本文提出了基于新数据的新分辨率分析，并重点关注两个特定问题：（1）内核边界处的密度跳跃，这对于讨论地球发电机的维持非常重要； （2）最下地幔可能存在密度过剩，这可能表明存在“热深海层”。我们发现内核边界处的密度跃变为 0.82 +/- 0.18 Mg m(-3)，这比之前认为的要大得多。我们还发现，虽然最下地幔密度可能增加 0.4%，但几乎没有证据支持这一说法。 (C) 2003 Elsevier B.V. 保留所有权利。
Roughly 30 years have passed since the last publication of a linear resolution calculation of density inside the Earth. Since that time, the data set of free oscillation degnerate frequencies has been completely re-estimated taking into account the biassing effects of splitting and coupling due to 3D structure. This paper presents a new resolution analysis based on the new data and focuses on two particular issues: (1) the density jump at the inner-core boundary which is important in discussions of the maintenance of the geodynamo; and (2) a possible density excess in the lowermost mantle which might be indicative of a "hot abyssal layer". We find that the density jump at the inner-core boundary is 0.82 +/- 0.18 Mg m(-3) which is significantly larger than previously thought. We also find little support for an excess density in the lowermost mantle though an increase of 0.4% is possible. (C) 2003 Elsevier B.V. All rights reserved.