Ocean circulation induced magnetic signals are sensitive towards oceanic water transports, heat, and salinity. Thus, measurements of these signals (e.g., by satellites), could be used as a new source for correcting general circulation models of the ocean. For this goal, we combine numerical forward models of the general ocean circulation with electromagnetic induction models. This model combination is first used to examine oceanic magnetic signals with respect to their intensity, temporal and spatial patterns, as well as their sensitivity towards oceanographic quantities. In combination with data assimilation methods (Kalman filters), these findings are used to constrain and correct forward simulations of the general ocean circulation with the measurements of the ocean-induced magnetic field (Irrgang et al., 2017).
Reference:
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Saynisch-Wagner, J., Petereit, J., Irrgang, C., Thomas, M. (2020): Phase changes of electromagnetic oceanic tidal signals. - Journal of Geophysical Research: Oceans, 125, 4, e2019JC015960. https://doi.org/10.1029/2019JC015960
Irrgang, C., Saynisch, J., Thomas, M. (2019): Estimating global ocean heat content from tidal magnetic satellite observations. - Scientific Reports, 9, 7893. https://doi.org/10.1038/s41598-019-44397-8
Šachl, L., Martinec, Z., Velímský, J., Irrgang, C., Petereit, J., Saynisch, J., Einšpigel, D., Schnepf, N. R. (2019): Modelling of electromagnetic signatures of global ocean circulation: physical approximations and numerical issues. - Earth Planets and Space, 71, 58. https://doi.org/10.1186/s40623-019-1033-7
Petereit, J., Saynisch, J., Irrgang, C., Thomas, M. (2019): Analysis of ocean tide induced magnetic fields derived from oceanic in‐situ observations — climate trends and the remarkable sensitivity of shelf regions. - Journal of Geophysical Research, 124, 11, 8257-8270. https://doi.org/10.1029/2018JC014768
Saynisch, J., Irrgang, C., Thomas, M. (2018): On the Use of Satellite Altimetry to Detect Ocean Circulation's Magnetic Signals. - Journal of Geophysical Research, 123, 3, 2305-2314. https://doi.org/10.1002/2017JC013742
Saynisch, J., Irrgang, C., Thomas, M. (2018): Estimating ocean tide model uncertainties for electromagnetic inversion studies. - Annales Geophysicae, 36, 1009-1014. https://doi.org/10.5194/angeo-36-1009-2018
Irrgang, C., Saynisch, J., & Thomas, M. (2017). Utilizing oceanic electromagnetic induction to constrain an ocean general circulation model: A data assimilation twin experiment. J. Adv. Model. Earth Syst., 9(3), 1703–1720. https://doi.org/10.1002/2017MS000951