On the detectability of the magnetic fields induced by ocean circulation in geomagnetic satellite observations

Earth, Planets and Space

Full Paper

Aaron Hornschild¹  Christopher Irrgang¹  Jan Saynisch-Wagner¹  Julien Baerenzung¹  Maik Thomas² 

[1] Helmholtz Centre Potsdam, GFZ German Research Centre for Geosciences, Section 1.3: Earth System Modelling, Potsdam, Germany;Helmholtz Centre Potsdam, GFZ German Research Centre for Geosciences, Section 1.3: Earth System Modelling, Potsdam, Germany;Institute of Meteorology, Freie Universität Berlin, Berlin, Germany;

关键词: Electromagnetic induction;    Ocean circulation;    Satellite magnetometer observations;    Kalman filter;    Assimilation;    Observing system simulation experiment;   

DOI  :  10.1186/s40623-022-01741-z

 received in 2022-05-16, accepted in 2022-11-10,  发布年份 2022

来源: Springer

【 摘 要 】

Due to their sensitivity to conductivity and oceanic transport, magnetic signals caused by the movement of the ocean are a beneficial source of information. Satellite observed tidal-induced magnetic fields have already proven to be helpful to derive Earth’s conductivity or ocean heat content. However, magnetic signals caused by ocean circulation are still unobserved in satellite magnetometer data. We present a novel method to detect these magnetic signals from ocean circulation using an observing system simulation experiment. The introduced approach relies on the assimilation of satellite magnetometer data based on a Kalman filter algorithm. The separation from other magnetic contributions is attained by predicting the temporal behavior of the ocean-induced magnetic field through presumed proxies. We evaluate the proposed method in different test case scenarios. The results demonstrate a possible detectability of the magnetic signal in large parts of the ocean. Furthermore, we point out the crucial dependence on the magnetic signal’s variability and show that our approach is robust to slight spatial and temporal deviations of the presumed proxies. Additionally, we showed that including simple prior spatial constraints could further improve the assimilation results. Our findings indicate an appropriate sensitivity of the detection method for an application outside the presented observing system simulation experiment. Therefore, we finally discussed potential issues and required advances toward the method’s application on original geomagnetic satellite observations.Graphical Abstract

【 授权许可】

CC BY   
© The Author(s) 2022

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