Oceanic excitation of polar motion and nutation: an overview

Exchanges of the angular momentum between the atmosphere, the ocean and the solid Earth have an important impact on polar motion at periods from a fraction of a day to years and contribute significantly to nutation. But while the role of the atmosphere in the excitation balance is well established, the importance of the ocean has been recognized only recently. This paper gives an overview of the non-tidal oceanic excitation of polar motion and nutation by taking into account recent advances in modeling the oceanic angular momentum.