气候变化领域集成服务门户(CCPortal): Recent north magnetic pole acceleration towards Siberia caused by flux lobe elongation

CCPortal

DOI	10.1038/s41561-020-0570-9
	Recent north magnetic pole acceleration towards Siberia caused by flux lobe elongation
	Livermore P.W.; Finlay C.C.; Bayliff M.
发表日期	2020
ISSN	17520894
起始页码	387
结束页码	391
卷号	13 期号:5
英文摘要	The wandering of Earth’s north magnetic pole, the location where the magnetic field points vertically downwards, has long been a topic of scientific fascination. Since the first in situ measurements in 1831 of its location in the Canadian arctic, the pole has drifted inexorably towards Siberia, accelerating between 1990 and 2005 from its historic speed of 0–15 km yr−1 to its present speed of 50–60 km yr−1. In late October 2017 the north magnetic pole crossed the international date line, passing within 390 km of the geographic pole, and is now moving southwards. Here we show that over the last two decades the position of the north magnetic pole has been largely determined by two large-scale lobes of negative magnetic flux on the core–mantle boundary under Canada and Siberia. Localized modelling shows that elongation of the Canadian lobe, probably caused by an alteration in the pattern of core flow between 1970 and 1999, substantially weakened its signature on Earth’s surface, causing the pole to accelerate towards Siberia. A range of simple models that capture this process indicate that over the next decade the north magnetic pole will continue on its current trajectory, travelling a further 390–660 km towards Siberia. © 2020, The Author(s), under exclusive licence to Springer Nature Limited.
英文关键词	acceleration; core-mantle boundary; in situ measurement; magnetic field; Canada; Siberia
语种	英语
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/206807
作者单位	School of Earth and Environment, University of Leeds, Leeds, United Kingdom; DTU Space, Technical University of Denmark, Copenhagen, Denmark
推荐引用方式 GB/T 7714	Livermore P.W.,Finlay C.C.,Bayliff M.. Recent north magnetic pole acceleration towards Siberia caused by flux lobe elongation[J],2020,13(5).
APA	Livermore P.W.,Finlay C.C.,&Bayliff M..(2020).Recent north magnetic pole acceleration towards Siberia caused by flux lobe elongation.Nature Geoscience,13(5).
MLA	Livermore P.W.,et al."Recent north magnetic pole acceleration towards Siberia caused by flux lobe elongation".Nature Geoscience 13.5(2020).