Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2020GL090544 |
Numerical dynamo simulations reproduce palaeomagnetic field behaviour | |
D. G. Meduri; A. J. Biggin; C. J. Davies; R. K. Bono; C. J. Sprain; J. Wicht | |
2021-01-12 | |
发表期刊 | Geophysical Research Letters
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出版年 | 2021 |
英文摘要 | Numerical geodynamo simulations capture several features of the spatial and temporal geomagnetic field variability on historical and Holocene timescales. However, a recent analysis questioned the ability of these numerical models to comply with long‐term palaeomagnetic field behaviour. Analysing a suite of 50 geodynamo models, we present here the first numerical simulations known to reproduce the salient aspects of the palaeosecular variation and time‐averaged field behaviour since 10 Ma. We find that the simulated field characteristics covary with the relative dipole field strength at the core‐mantle boundary (dipolarity). Only models dominantly driven by compositional convection, with an Ekman number (ratio of viscous to Coriolis forces) lower than 10−3 and a dipolarity in the range 0.34 − 0.56 can capture the observed palaeomagnetic field behaviour. This dipolarity range agrees well with state‐of‐the‐art statistical field models and represent a testable prediction for next generation global palaeomagnetic field model reconstructions. |
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/311323 |
专题 | 气候变化 |
推荐引用方式 GB/T 7714 | D. G. Meduri,A. J. Biggin,C. J. Davies,et al. Numerical dynamo simulations reproduce palaeomagnetic field behaviour[J]. Geophysical Research Letters,2021. |
APA | D. G. Meduri,A. J. Biggin,C. J. Davies,R. K. Bono,C. J. Sprain,&J. Wicht.(2021).Numerical dynamo simulations reproduce palaeomagnetic field behaviour.Geophysical Research Letters. |
MLA | D. G. Meduri,et al."Numerical dynamo simulations reproduce palaeomagnetic field behaviour".Geophysical Research Letters (2021). |
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