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DOI | 10.1029/2020GL087940 |
Decomposition of geomagnetic secular acceleration into traveling waves using complex empirical orthogonal functions | |
Rodrigo Chi‐; Durá; n; Margaret S. Avery; Nicholas Knezek; Bruce A. Buffett | |
2020-07-08 | |
发表期刊 | Geophysical Research Letters
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出版年 | 2020 |
英文摘要 | Satellite observations reveal short pulses in the second time‐derivative of the geomagnetic field. We seek to interpret these signals using complex empirical orthogonal functions (CEOFs). This methodology decomposes the signal into traveling waves, permitting estimates for the period, angular wave number and phase velocity. We recover CEOFs from the CHAOS‐6 model, focusing on three geographic regions with strong secular acceleration. Two regions are confined to the equator, while the third is located under Alaska. We find evidence for both eastward and westward traveling waves with periods between 7 and 20 years. There is also evidence for weaker standing waves with complex spatial patterns. Two of the three regions have waves that are compatible with predictions for waves in a stratified fluid. Our results yield estimates for the structure of fluid stratification at the top of the core. |
领域 | 气候变化 |
URL | 查看原文 |
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文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/283289 |
专题 | 气候变化 |
推荐引用方式 GB/T 7714 | Rodrigo Chi‐,Durá,n,et al. Decomposition of geomagnetic secular acceleration into traveling waves using complex empirical orthogonal functions[J]. Geophysical Research Letters,2020. |
APA | Rodrigo Chi‐,Durá,n,Margaret S. Avery,Nicholas Knezek,&Bruce A. Buffett.(2020).Decomposition of geomagnetic secular acceleration into traveling waves using complex empirical orthogonal functions.Geophysical Research Letters. |
MLA | Rodrigo Chi‐,et al."Decomposition of geomagnetic secular acceleration into traveling waves using complex empirical orthogonal functions".Geophysical Research Letters (2020). |
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