3-D modelling the electric field due to ocean tidal flow and comparison with observations
3-D modelling the electric field due to ocean tidal flow and comparison with observations
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DOI：
10.1029/2005gl025043
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发表时间：
2006-03-28
影响因子：
5.2
通讯作者：
Utada, H
中科院分区：
文献类型：
--
作者：
Kuvshinov, A;Junge, A;Utada, H
海水的潮汐运动通过环境磁场，产生次级电场。这种运动感应电场可以在海洋或内陆探测到，并有可能对地球进行电探测。本文的第一个目标是了解由于潮汐海洋流的电信号的全球分布。我们模拟了两个潮汐分量的电信号-月球半日（M2）和周日（O 1）潮汐。我们假设一个现实的地球的电导率模型与表面薄壳和1-D地幔下面。模拟结果表明，在某些沿海地区，M2潮和O 1潮的电场幅值分别可达100 mV/km和10 mV/km。岩石圈电阻率的变化引起潮汐电信号的变化。我们表明我们的预测与观察结果非常一致。
The tidal motion of the ocean water through the ambient magnetic field, generates secondary electric field. This motionally induced electric field can be detected in the sea or inland and has a potential for electrical soundings of the Earth. A first goal of the paper is to gain an understanding of the global distribution of the electric signal due to tidal ocean flow. We simulate the electric signals for two tidal constituents - lunar semidiurnal (M2) and diurnal (O1) tides. We assume a realistic Earth's conductivity model with a surface thin shell and 1-D mantle underneath. Simulations demonstrate that in some coastal regions the amplitudes of the electric field can reach 100 mV/km and 10 mV/km for M2 and O1 tides respectively. The changes of lithosphere resistance produce detectable changes in the tidal electric signals. We show that our predictions are in a good agreement with observations.