The mantle rotation pole position. A solar component - INSU - Institut national des sciences de l'Univers Access content directly
Journal Articles Comptes Rendus. Géoscience Year : 2017

The mantle rotation pole position. A solar component

Fernando Lopes
  • Function : Correspondent author
Jean-Louis Le Mouël
  • Function : Author
  • PersonId : 838177
Dominique Gibert

Abstract

The direction of the Earth's rotation axis with respect to the mantle has been studied for more than a century. The time variation of this direction is generally considered to be the sum of three components: the annual wobble, forced by the atmosphere, the Chandler wobble, a free oscillation with a period of 435 days, and the so-called drift of the mean pole. In the present paper, applying the singular spectrum analysis (SSA) technique, we uncover two more components, with smaller amplitude than the three first ones, but well identified, periodic with periods of 11 and 5.5 years, respectively, undoubtedly linked to solar activity. We interpret them tentatively as the result of an exchange of kinetic angular momentum between the atmosphere, in which a flow would be generated by solar activity, and the mantle. The order of magnitude of the required mean winds in the atmosphere computed in the frame of a schematic model is 1 ms−1, compatible with the observed values of the meridional mean circulation
Fichier principal
Vignette du fichier
PL03793.pdf (1.08 Mo) Télécharger le fichier
Origin : Publication funded by an institution
Loading...

Dates and versions

insu-01574681 , version 1 (16-08-2017)

Identifiers

Cite

Fernando Lopes, Jean-Louis Le Mouël, Dominique Gibert. The mantle rotation pole position. A solar component. Comptes Rendus. Géoscience, 2017, 349 (4), pp.159-164. ⟨10.1016/j.crte.2017.06.001⟩. ⟨insu-01574681⟩
93 View
139 Download

Altmetric

Share

Gmail Facebook X LinkedIn More