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Intradecadal variations in length of day and their correspondence with geomagnetic jerks

文献类型：期刊论文

作者Duan, Pengshuo2; Huang, Chengli1,2
刊名NATURE COMMUNICATIONS
出版日期2020-05-08
卷号11期号:1页码:8
ISSN号2041-1723
DOI10.1038/s41467-020-16109-8
英文摘要Earth's core oscillations and magnetic field inside the liquid outer core cannot be observed directly from the surface, we can infer these information from the intradecadal variations in Earth's rotation rate defined by length of day. However, the fine time-varying characteristics as well as relevant mechanisms of the intradecadal variations are still unclear. Here we report that the intradecadal variations present a significant 8.6-year harmonic component with an unexpected increasing phenomenon, besides a 6-year decreasing oscillation. More importantly, we find that there is a very good correspondence between the extremes of the 8.6-year oscillation with geomagnetic jerks. The fast equatorial waves with subdecadal periods propagating at Earth's core surface may explain the origin of this 8.6-year oscillation. Earth rotation variation reflects the physics, dynamics and the magnetic field changes of Earth's interior. The authors find a significant similar to 8.6year periodic increasing oscillation in length of day and its good link to geomagnetic jerks related to Earth's core oscillations, which may be used to predict the future jerk timings.
WOS关键词TORSIONAL WAVES ; CORE SURFACE ; INNER-CORE ; SECULAR ACCELERATION ; NORMAL-MODES ; EARTHS ; OSCILLATION ; MANTLE ; EXCITATION ; DYNAMICS
资助项目B-type Strategic Priority Program of the Chinese Academy of Sciences[XDB41000000] ; National Natural Science Foundation of China[11803064] ; National Natural Science Foundation of China[11773058] ; National Natural Science Foundation of China[41774017] ; National Natural Science Foundation of China[11373058]
WOS研究方向Science & Technology - Other Topics
语种英语
出版者NATURE PUBLISHING GROUP
WOS记录号WOS:000533939300008
资助机构B-type Strategic Priority Program of the Chinese Academy of Sciences ; B-type Strategic Priority Program of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; B-type Strategic Priority Program of the Chinese Academy of Sciences ; B-type Strategic Priority Program of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; B-type Strategic Priority Program of the Chinese Academy of Sciences ; B-type Strategic Priority Program of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; B-type Strategic Priority Program of the Chinese Academy of Sciences ; B-type Strategic Priority Program of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China
源URL[http://ir.bao.ac.cn/handle/114a11/54710]  
专题中国科学院国家天文台
通讯作者Duan, Pengshuo; Huang, Chengli
作者单位1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
2.Chinese Acad Sci, Shanghai Astron Observ, CAS Key Lab Planetary Sci, Shanghai 200030, Peoples R China
推荐引用方式
GB/T 7714		 Duan, Pengshuo,Huang, Chengli. Intradecadal variations in length of day and their correspondence with geomagnetic jerks[J]. NATURE COMMUNICATIONS,2020,11(1):8.
APA Duan, Pengshuo,&Huang, Chengli.(2020).Intradecadal variations in length of day and their correspondence with geomagnetic jerks.NATURE COMMUNICATIONS,11(1),8.
MLA Duan, Pengshuo,et al."Intradecadal variations in length of day and their correspondence with geomagnetic jerks".NATURE COMMUNICATIONS 11.1(2020):8.

入库方式： OAI收割

来源：国家天文台

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