Lateral variations of electrical conductivity in the lower mantle constrained by Swarm and CryoSat-2 missions

The electrical conductivity is an important geophysical parameter connected to the thermal, chemical, and mineralogical state of the Earth’s mantle. In this paper, we apply the previously developed methodology of forward and inverse EM induction modeling to the latest version of satellite-derived sp...

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Veröffentlicht in:	Earth, planets, and space planets, and space, 2021-01, Vol.73 (1), p.1-12, Article 4
Hauptverfasser:	Velímský, Jakub, Knopp, Ondřej
Format:	Artikel
Sprache:	eng
Schlagworte:	1. Geomagnetism Characterization of the geomagnetic field and its dynamic environment using data from space-based magnetometers CryoSat-2 Earth Earth and Environmental Science Earth mantle Earth Sciences Electrical conductivity Electrical resistivity EM induction Geology Geophysics/Geodesy Lower mantle Magnetic fields Mantle Mantle electrical conductivity Natural history Observations Satellite data Satellites Spacecraft recovery Spherical harmonics Swarm Three dimensional models
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Beschreibung
Zusammenfassung:	The electrical conductivity is an important geophysical parameter connected to the thermal, chemical, and mineralogical state of the Earth’s mantle. In this paper, we apply the previously developed methodology of forward and inverse EM induction modeling to the latest version of satellite-derived spherical harmonic coefficients of external and internal magnetic field, and obtain the first 3-D mantle conductivity models with contributions from Swarm and CryoSat-2 satellite data. We recover degree 3 conductivity structures which partially overlap with the shape of the large low-shear velocity provinces in the lower mantle.
ISSN:	1880-5981 1343-8832 1880-5981
DOI:	10.1186/s40623-020-01334-8