气候变化领域集成服务门户(CCPortal): Multidecadal variation of the Earth's inner-core rotation

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DOI	10.1038/s41561-022-01112-z
	Multidecadal variation of the Earth's inner-core rotation
	Yang, Yi; Song, Xiaodong
发表日期	2023
ISSN	1752-0894
EISSN	1752-0908
起始页码	182
结束页码	+
卷号	16 期号:2 页码:17
英文摘要	Differential rotation of Earth's inner core relative to the mantle is thought to occur under the effects of the geodynamo on core dynamics and gravitational core-mantle coupling. This rotation has been inferred from temporal changes between repeated seismic waves that should traverse the same path through the inner core. Here we analyse repeated seismic waves from the early 1990s and show that all of the paths that previously showed significant temporal changes have exhibited little change over the past decade. This globally consistent pattern suggests that inner-core rotation has recently paused. We compared this recent pattern to the Alaskan seismic records of South Sandwich Islands doublets going back to 1964 and it seems to be associated with a gradual turning-back of the inner core as a part of an approximately seven-decade oscillation, with another turning point in the early 1970s. This multidecadal periodicity coincides with changes in several other geophysical observations, especially the length of day and magnetic field. These observations provide evidence for dynamic interactions between the Earth's layers, from the deepest interior to the surface, potentially due to gravitational coupling and the exchange of angular momentum from the core and mantle to the surface. Multidecadal oscillation of the Earth's inner core, coinciding with length of day and magnetic field variations, is experiencing a pause and reversing, according to analysis of repeating seismic waves traversing the inner core since the 1960s.
学科领域	Geosciences, Multidisciplinary
语种	英语
WOS研究方向	Geology
WOS记录号	WOS:000919704300001
来源期刊	NATURE GEOSCIENCE
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/272465
作者单位	Peking University; Peking University
推荐引用方式 GB/T 7714	Yang, Yi,Song, Xiaodong. Multidecadal variation of the Earth's inner-core rotation[J],2023,16(2):17.
APA	Yang, Yi,&Song, Xiaodong.(2023).Multidecadal variation of the Earth's inner-core rotation.NATURE GEOSCIENCE,16(2),17.
MLA	Yang, Yi,et al."Multidecadal variation of the Earth's inner-core rotation".NATURE GEOSCIENCE 16.2(2023):17.