气候变化领域集成服务门户(CCPortal): Joint Inversion of Daily and Long-Period Geomagnetic Transfer Functions Reveals Lateral Variations in Mantle Water Content

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DOI	10.1029/2020GL087222
	Joint Inversion of Daily and Long-Period Geomagnetic Transfer Functions Reveals Lateral Variations in Mantle Water Content
	Munch F.D.; Grayver A.V.; Guzavina M.; Kuvshinov A.V.; Khan A.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:10
英文摘要	We present a novel approach to investigate variations in upper mantle and transition zone (MTZ) water content based on the joint analysis of electromagnetic (EM) signals originating in the ionosphere and magnetosphere. We invert EM signals (period range 6 hr to 85 days) to probe the electrical conductivity structure underneath 20 geomagnetic observatories, accounting for the complex spatial structure of the ionospheric and magnetospheric sources. The joint inversion of EM data for the daily and long-period bands leads to significantly improved resolution in the upper mantle and MTZ. The conductivity profiles reveal significant lateral variability, which we interpret in terms of mantle water content by coupling electrical conductivity with constrains on mantle thermochemical structure derived from the analysis of seismic data. Our results suggest the existence of a relatively dry MTZ beneath Europe and a water-enriched MTZ underneath North America and northern Asia. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Electric conductivity; Ionosphere; Magnetosphere; Seismology; Electrical conductivity; Geomagnetic transfer functions; Joint analysis; Joint inversion; Lateral variations; Spatial structure; Thermo-chemical structures; Transition zones; Geomagnetism; data interpretation; electrical conductivity; electromagnetic radiation; inverse analysis; ionosphere; spatial analysis; thermochemistry; transition zone; upper mantle; water content; Asia; Europe; North America
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/170362
作者单位	Institute of Geophysics, ETH Zürich, Zürich, Switzerland; Institute of Theoretical Physics, University of Zürich, Zürich, Switzerland
推荐引用方式 GB/T 7714	Munch F.D.,Grayver A.V.,Guzavina M.,et al. Joint Inversion of Daily and Long-Period Geomagnetic Transfer Functions Reveals Lateral Variations in Mantle Water Content[J],2020,47(10).
APA	Munch F.D.,Grayver A.V.,Guzavina M.,Kuvshinov A.V.,&Khan A..(2020).Joint Inversion of Daily and Long-Period Geomagnetic Transfer Functions Reveals Lateral Variations in Mantle Water Content.Geophysical Research Letters,47(10).
MLA	Munch F.D.,et al."Joint Inversion of Daily and Long-Period Geomagnetic Transfer Functions Reveals Lateral Variations in Mantle Water Content".Geophysical Research Letters 47.10(2020).