OceanMag II EM-Raying the Ocean

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Presentation transcript:

OceanMag II EM-Raying the Ocean Jan Saynisch, Johannes Petereit, Christopher Irrgang GFZ German Research Centre for Geosciences, Potsdam DFG SPP 1788 Dynamic Earth Colloquium June 14-16, 2017 Bremen

Using Swarm observations of oceanic electromagnetic induction to improve global ocean circulation models -10 -6 -2 2 6 10 [nT] Ocean circulation induced magnetic field at sea surface -10 -6 -2 2 6 10 [nT] Tidal (M2) induced magnetic field at sea surface

Using Swarm observations of oceanic electromagnetic induction to improve global ocean circulation models -10 -6 -2 2 6 10 [nT] Ocean circulation induced magnetic field at sea surface Our data assimilation twin experiment shows (Irrgang et al., 2017, accepted): Ocean velocities can be corrected Ocean heat and salinity are not corrected Not yet extracted from Swarm observations -10 -6 -2 2 6 10 [nT] Tidal (M2) induced magnetic field at sea surface Tidal magnetic field is sensitive towards changes in ocean heat and salinity (Saynisch et al., 2016, 2017) Recently extracted from Swarm observations (Sabaka et al., 2017) Utilize tidal magnetic observations to improve oceanic heat and salinity transports in ocean models

References Cover picture http://en.es-static.us/upl/2016/05/swarm-satellites-ESA-e1463262322667.jpg Irrgang, C., Saynisch, J., Thomas, M. (2017). Utilizing electromagnetic induction to constrain an ocean general circulation model: A data assimilation twin experiment. Accepted in Journal of Advances in Modeling Earth Systems. Sabaka, T. J., Tyler, R. H., & Olsen, N. (2016). Extracting Ocean-Generated Tidal Magnetic Signals From Swarm Data through Satellite Gradiometry. Geophys. Res. Lett. http://doi.org/10.1002/2016GL068180 Saynisch, J., Petereit, J., Irrgang, C., Kuvshinov, A., & Thomas, M. (2016). Impact of climate variability on the tidal oceanic magnetic signal-A model-based sensitivity study. J. Geophys. Res. Oceans, 121(8), 5931–5941. http://doi.org/10.1002/2016JC012027 Saynisch, J., Petereit, J., Irrgang, C., & Thomas, M. (2017). Impact of oceanic warming on electromagnetic oceanic tidal signals: A CMIP5 climate model-based sensitivity study. Geophys. Res. Lett., 1–7. http://doi.org/10.1002/2017GL073683