Assimilation of oceanic magnetic signals

RMS difference maps of the conductivity-weighted and depth-integrated ocean velocities of reference and truth runs. Bottom: Changes in the RMS difference due to the Kalman filtering. Blue areas indicate improvements, red areas indicate deteriorations.

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:

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

Contact

Christopher Irrgang
Scientist
Dr. Christopher Irrgang
Earth System Modelling
Telegrafenberg
Building A 20, Room 313
14473 Potsdam
+49 331 288-2847
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