Magnetic signals from oceanic tides: new satellite observations and applications
arxiv(2024)
摘要
Tidal flow of seawater across the Earth's magnetic field induces electric
currents and magnetic fields within the ocean and solid Earth. The amplitude
and phase of the induced fields depends on electrical properties of both the
seawater and the solid Earth, thus can be used as a proxy to study seabed
properties or potentially for monitoring long-term trends in the global ocean
climatology. This paper presents new global oceanic tidal magnetic field models
and their uncertainties for four tidal constituents, including M_2, N_2, O_1
and for the first time Q_1. Models are obtained through a robust
least-squares analysis of magnetic field observations from the Swarm and CHAMP
satellites using a specially designed data selection scheme. We compare the
retrieved magnetic signals with several alternative models reported in the
literature. Additionally, we validate them using a series of high-resolution
global 3-D electromagnetic simulations and place constraints on the
conductivity of sub-oceanic mantle for all tidal constituents, revealing an
excellent agreement between all tidal constituents and the oceanic upper mantle
structure.
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