Electrical Conductivity of Mantle Transition Zone and Water Content Revealed by the Magnetic Data of China Seismo-Electromagnetic Satellite

IF 4.7 2区地球科学 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing Pub Date : 2024-12-27 DOI:10.1109/JSTARS.2024.3523671

Mingquan Lai;Xiuyan Ren;Changchun Yin;Yunhe Liu;Xinpeng Ma;Yinglin Wang;Shufan Zhao

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Abstract

The mantle transition zone (MTZ) plays a key role in the deep global material cycle, while the water content in MTZ is debated from saturated to dry. Since the electrical conductivity is highly sensitive to water, its accurate estimation will greatly help reveal the water content. The high quality and plenty of data are crucial for global-scale conductivity recovery. In this article, we use the magnetic vector data of China seismo-electromagnetic satellite (CSES) to estimate the global mantle electrical structure, accompanying with the Swarm satellite and observatories. In particular, we correct the latitude effect of CSES Level 2 data. The radial conductivity model and uncertainty information of the Earth are obtained by using Bayesian inversion. It is found that large changes in the electrical results of MTZ occur when using the CSES magnetic field data. The conductivity is higher than that inverted from Swarm data, but lower than that from the observatory data. Finally, we, respectively, invert the resistivity structure of the MTZ with two years and nearly nine years of database of CSES, Swarm, and observatories, and analyze the laboratory conductivity model. The results indicate that the water content of the MTZ is less than 0.01 weight%.

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中国地震电磁卫星磁资料揭示的地幔过渡带电导率和含水量

地幔过渡带（MTZ）在全球深部物质循环中起着关键作用，而地幔过渡带的含水量从饱和到干燥一直存在争议。由于电导率对水分非常敏感，因此准确的电导率估算对揭示含水率有很大帮助。高质量和丰富的数据对于全球范围的电导率恢复至关重要。本文利用中国地震电磁卫星（CSES）的磁矢量资料，结合Swarm卫星和观测站对全球地幔电性结构进行了估计。特别地，我们修正了CSES 2级数据的纬度效应。利用贝叶斯反演得到了地球的径向电导率模型和不确定性信息。利用CSES磁场数据，发现MTZ的电学结果发生了较大的变化。电导率高于Swarm数据反演的电导率，但低于观测数据反演的电导率。最后，我们分别利用CSES、Swarm和观测站2年和近9年的数据反演了MTZ的电阻率结构，并对实验室电导率模型进行了分析。结果表明，MTZ的含水量小于0.01重量%。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing 地学-成像科学与照相技术

CiteScore

9.30

自引率

10.90%

发文量

563

审稿时长

4.7 months

期刊介绍： The IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing addresses the growing field of applications in Earth observations and remote sensing, and also provides a venue for the rapidly expanding special issues that are being sponsored by the IEEE Geosciences and Remote Sensing Society. The journal draws upon the experience of the highly successful “IEEE Transactions on Geoscience and Remote Sensing” and provide a complementary medium for the wide range of topics in applied earth observations. The ‘Applications’ areas encompasses the societal benefit areas of the Global Earth Observations Systems of Systems (GEOSS) program. Through deliberations over two years, ministers from 50 countries agreed to identify nine areas where Earth observation could positively impact the quality of life and health of their respective countries. Some of these are areas not traditionally addressed in the IEEE context. These include biodiversity, health and climate. Yet it is the skill sets of IEEE members, in areas such as observations, communications, computers, signal processing, standards and ocean engineering, that form the technical underpinnings of GEOSS. Thus, the Journal attracts a broad range of interests that serves both present members in new ways and expands the IEEE visibility into new areas.