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Journal Article

Impact of oceanic warming on electromagnetic oceanic tidal signals - a CMIP5 climate model based sensitivity study

Authors
/persons/resource/saynisch

Saynisch,  J.
1.3 Earth System Modelling, 1.0 Geodesy, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/petereit

Petereit,  J.
1.3 Earth System Modelling, 1.0 Geodesy, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/irrgang

Irrgang,  Christopher
1.3 Earth System Modelling, 1.0 Geodesy, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/mthomas

Thomas,  M.
1.3 Earth System Modelling, 1.0 Geodesy, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

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2230911.pdf
(Publisher version), 747KB

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Citation

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. - Geophysical Research Letters, 44, 10, 4994-5000.
https://doi.org/10.1002/2017GL073683


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_2230911
Abstract
In contrast to ocean circulation signals, ocean tides are already well detectable by electromagnetic measurements. Oceanic electric conductivities from the Coupled Model Intercomparison Project Phase 5 (CMIP5) climate simulations are combined with tidal currents of M2 and O1 to estimate electromagnetic tidal signals and their sensitivity to global warming. Ninety-four years of global warming lead to differences of ±0.3 nT in tidal magnetic amplitudes and ±0.1 mV/km in the tidal electric amplitudes at sea level. Locally, the climate induced changes can be much higher, e.g., +1 nT in the North Atlantic. In general, all studied electromagnetic tidal amplitudes show large scale climate induced anomalies that are strongest in the northern hemisphere and amount to 30% of their actual values. Consequently, changes in oceanic electromagnetic tidal amplitudes should be detectable in electromagnetic records. Electric and magnetic signals, as well as tides of different frequencies contain complementary regional information.