Atmospheric and oceanic excitation of the rotation of a three-layer Earth

Details Atmospheric and oceanic excitation of the rotation of a three-layer Earth Atmospheric and oceanic excitation of the rotation of a three-layer Earth

Aug 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005a%26a...438.1149d&link_type=abstract

Astronomy and Astrophysics, Volume 438, Issue 3, August II 2005, pp.1149-1161

Astronomy and Astrophysics

Astrophysics

8

Earth, Reference Systems

Scientific paper

In this paper, we evaluate the nutational Earth response to the excitation exerted by a surface fluid (atmosphere, ocean, and hydrology) for a simple Earth model, constituted of three homogeneous layers: a solid deformable inner-core, a liquid outer core, and an elastic mantle. Our formula, valid in the quasi-diurnal frequency band, includes two resonances, at the Free Core Nutation (FCN) and the Free Inner-Core Nutation (FICN). Additionally, we have evaluated the amplitudes of those wobbles in response to a random noise excitation. We show that, compared with the FCN signal, the resonance at the FICN frequency induced by a surface fluid layer only induces a very small signal in the Earth rotation, and that, with an excitation comparable to the one available at the FCN, the FICN would generate a signal at the Earth surface at the sub-micrometer level.

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