Collaborative Research: Global Conductivity by Spatiotemporal Analysis

地幔电导率的横向变化提供了对地幔对流、俯冲板块的命运、地幔柱的分布以及上地幔到下地幔过渡带性质的深入了解。地幔电导率的传统研究是利用永久地磁台时间序列的傅立叶分析得到的频域响应函数。然而，这种方法受到稀疏和地理上不规则的观测站分布的限制。磁卫星记录连续的时空磁波动，提供了克服这一限制的机会，因为它们对地球仪进行了全面的采样。调查人员提议开发一个时域三维球形地球感应编码，并利用磁卫星和奥斯特卫星的数据调查上地幔电导率的三维变化。

ConstableEAR-0087391Lateral variations in mantle electrical conductivity provide insight into mantle convection, the fate of subducting slabs, the distribution of mantle plumes, and the nature of the transition zone from upper to lower mantle. Mantle electrical conductivity traditionally has been studied using frequency-domain response functions derived from Fourier analysis of permanent geomagnetic observatory time series. This method is limited however by the sparse and geographically irregular observatory distribution. Magnetic satellites, which record continuous spatiotemporal magnetic fluctuations, offer an opportunity to overcome this limitation since they sample the globe completely. The investigators have proposed to develop a time-domain 3D spherical Earth induction code and use data from the MAGSAT and Oersted satellites to investigate 3D variations in upper mantle electrical conductivity.