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| Titel |
Benchmark study of magnetic induction codes forced by ocean electric currents |
| VerfasserIn |
Libor Šachl, David Einspigel, Alexander Grayver, Christopher Irrgang, Alexei Kuvshinov, Zdeněk Martinec, Johannes Petereit, Jan Saynish, Neesha Schnepf, Jakub Velimsky |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250148938
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| Publikation (Nr.) |
 EGU/EGU2017-13244.pdf |
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| Zusammenfassung |
| We present a benchmark in which magnetic induction codes are tested in a series of modeling studies. Ocean electric currents provide the forcing. We focus on the wind- and buoyancy-driven ocean-induced magnetic field; tides are not considered. The individual benchmarks start with the magnetostatic case of time-invariant forcing and homogeneous surface conductivity, and the benchmark complexity increases gradually from this starting point. We test a rich variety of induction codes. There are codes based on the full equation of electromagnetic induction, as well as codes that utilize certain approximations of the governing equation, e.g. Tyler (1997)’s thin layer approximation. We include both time-domain and frequency-domain codes. In order to assess the performance of the individual codes, we compare the spatial distributions and power spectra of the induced magnetic fields.
References
Stephenson, D. & Bryan, K. Large-scale electric and magnetic fields generated by the oceans. J. Geophys. Res 97, 15467 (1992).
Tyler, R. H., Mysak, L. A., and Oberhuber, J. M, 1997. Electromagnetic fields generated by a three dimensional global ocean circulation. J. Geophys. Res., 102, 5531–5551. |
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