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Impact of Variable Sea-water Conductivity on Motional Induction Simulated with an Ogcm : Volume 12, Issue 4 (19/08/2015)

By Irrgang, C.

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Book Id: WPLBN0004020878
Format Type: PDF Article :
File Size: Pages 23
Reproduction Date: 2015

Title: Impact of Variable Sea-water Conductivity on Motional Induction Simulated with an Ogcm : Volume 12, Issue 4 (19/08/2015)  
Author: Irrgang, C.
Volume: Vol. 12, Issue 4
Language: English
Subject: Science, Ocean, Science
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Thomas, M., Irrgang, C., & Saynisch, J. (2015). Impact of Variable Sea-water Conductivity on Motional Induction Simulated with an Ogcm : Volume 12, Issue 4 (19/08/2015). Retrieved from

Description: Helmholtz Centre Potsdam, GFZ German Research Centre for Geosciences, Section 1.3, Earth System Modelling, Potsdam, Germany. Carrying high concentrations of dissolved salt, ocean water is a good electrical conductor. As sea-water flows through the Earth's ambient geomagnetic field, electric fields are generated, which in turn induce secondary magnetic fields. In current models for oceanic induced magnetic fields, a realistic consideration of sea-water conductivity is often neglected and the effect on the variability of the oceanic induced magnetic field unknown. To model magnetic fields that are induced by non-tidal global ocean currents, an electromagnetic induction model is implemented into the Ocean Model for Circulation and Tides (OMCT). This provides the opportunity to not only model oceanic induced magnetic signals, but to assess the impact of oceanographic phenomena on the induction process. In this paper, the sensitivity of the induction process due to spatial and temporal variations in sea-water conductivity is investigated. It is shown that assuming an ocean-wide uniform conductivity is insufficient to accurately capture the temporal variability of the magnetic signal. Using instead a realistic global sea-water conductivity distribution increases the temporal variability of the magnetic field up to 45 %. Especially vertical gradients in sea-water conductivity prove to be a key factor for the variability of the oceanic induced magnetic field. However, temporal variations of sea-water conductivity only marginally affect the magnetic signal.

Impact of variable sea-water conductivity on motional induction simulated with an OGCM

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