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DOI | 10.1029/2020GL087109 |
Convective erosion of a primordial stratification atop Earth's core | |
M. Bouffard; M. Landeau; A. Goument | |
2020-05-03 | |
发表期刊 | Geophysical Research Letters
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出版年 | 2020 |
英文摘要 | Seismic and geomagnetic observations suggest the presence of a stratified layer atop Earth's core. Previous laboratory experiments showed that this layer could be primordial, produced by a collision between the primitive Earth and a giant impactor. However, paleomagnetic data require turbulent flow motions in the core for the last 3.4Ga. Such flows can erode an existing stratification. It is therefore unclear whether a primordial stratification still exists nowadays. Here, we use numerical simulations to investigate the erosion by thermal convection of a chemical layer atop Earth's core. Our scaling law predicts that a primordial layer thicker than 1km with a density anomaly above 0.01% can survive 4.5Ga of convective erosion. We conclude that the observed present‐day stratification could be a vestige of core formation. We also observe strong double‐diffusive flows in the layer. These might reconcile the existence of a stratification with the present‐day structure of the geomagnetic field. |
领域 | 气候变化 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/248883 |
专题 | 气候变化 |
推荐引用方式 GB/T 7714 | M. Bouffard,M. Landeau,A. Goument. Convective erosion of a primordial stratification atop Earth's core[J]. Geophysical Research Letters,2020. |
APA | M. Bouffard,M. Landeau,&A. Goument.(2020).Convective erosion of a primordial stratification atop Earth's core.Geophysical Research Letters. |
MLA | M. Bouffard,et al."Convective erosion of a primordial stratification atop Earth's core".Geophysical Research Letters (2020). |
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