Japan Geoscience Union Meeting 2023

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[E] Oral

S (Solid Earth Sciences ) » S-EM Earth's Electromagnetism

[S-EM14] Electric, magnetic and electromagnetic survey technologies and scientific achievements

Wed. May 24, 2023 10:45 AM - 12:00 PM 106 (International Conference Hall, Makuhari Messe)

convener:Kiyoshi Baba(Earthquake Research Institute, The University of Tokyo), Tada-nori Goto(Graduate School of Science, University of Hyogo), Yuguo Li(Ocean University of China), Wiebke Heise(GNS Science, PO Box 30368, Lower Hutt, New Zealand), Chairperson:Tada-nori Goto(Graduate School of Science, University of Hyogo), Sihong Wu(Department of Geophysics, School of Earth and Space Sciences, Peking University, Beijing, China)

11:45 AM - 12:00 PM

[SEM14-20] Impact of variable seawater conductivity on ocean wave-induced electromagnetic fields simulated with finite difference method

*Jiaqi Ge1, Yuguo Li1 (1.ocean university of china)


Keywords:electromagnetic fields, variable seawater conductivity, wind waves, swell, mixed ocean wave

Electric fields generated by the motion of ocean waves through the Earth’s ambient geomagnetic fields and the induced secondary magnetic fields can be observed at the seafloor, at the sea-surface and in the air. In current studies on ocean wave-induced electromagnetic fields, the seawater conductivity is usually assumed to be constant and ocean waves are treated as regular waves with fixed amplitudes and frequencies. However, seawater conductivity is variable in the actual ocean and the actual ocean waves are the sum of multiple regular waves. In this paper, we present a finite difference algorithm for modeling the ocean wave-induced electromagnetic fields with the variation of seawater conductivity. We investigate impacts of variable seawater conductivity on the electric and magnetic fields induced by the wind waves and swell as well as mixed ocean waves, and analyze the characteristics of the electromagnetic fields.