Joint inversion of satellite-detected tidal and magnetospheric signals constrains electrical conductivity and water content of the upper mantle and transition zone
Joint inversion of satellite-detected tidal and magnetospheric signals constrains electrical conductivity and water content of the upper mantle and transition zone
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DOI：
10.1002/2017gl073446
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发表时间：
2017-06-28
影响因子：
5.2
通讯作者：
Toffner-Clausen, L.
中科院分区：
文献类型：
--
作者：
Grayver, A. V.;Munch, F. D.;Toffner-Clausen, L.
我们提出了一个新的地幔全球电导率模型。该模型是通过使用一种新的方法推导出来的，该方法基于同时反演不同来源的卫星磁场测量结果。具体地说，我们估计了磁层起源和海洋潮汐磁信号的响应，这些信号来自最新的SARM和CHAMP数据。通过对麦克斯韦方程的全三维求解，解决了在数据中恰当地解释海洋效应这一具有挑战性的任务。我们表明，磁层和潮汐磁信号的同时反演导致了一个分辨率大大提高的模型。与实验室的电导率剖面对比表明，所得到的模型与上地幔和过渡带的热解组分和含水率分别为0.01wt%和0.1wt%的热解相吻合。
We present a new global electrical conductivity model of Earth's mantle. The model was derived by using a novel methodology, which is based on inverting satellite magnetic field measurements from different sources simultaneously. Specifically, we estimated responses of magnetospheric origin and ocean tidal magnetic signals from the most recent Swarm and CHAMP data. The challenging task of properly accounting for the ocean effect in the data was addressed through full three-dimensional solution of Maxwell's equations. We show that simultaneous inversion of magnetospheric and tidal magnetic signals results in a model with much improved resolution. Comparison with laboratory-based conductivity profiles shows that obtained models are compatible with a pyrolytic composition and a water content of 0.01 wt% and 0.1 wt% in the upper mantle and transition zone, respectively.