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Excitation of the Chandler Wobble

Published online by Cambridge University Press:  12 April 2016

N.S. Sidorenkov
N.S. Sidorenkov*
Affiliation:
Hydrometeorological Centre of the Russian Federation, Bol’shoi Predtechenskii per. 9-13, Moscow, Russia. e-mail:sidor@glasnet.ru

Abstract

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The redistribution of air and water masses between the Pacific and Indian oceans during the El Niño/Southern oscillation (ENSO) changes the components of the Earth’s inertia tensor and shifts the position of the pole of the Earth’s rotation. The spectrum of the ENSO has components with periods of about 6, 3.6, 2.8, and 2.4 years. These periods are all the multiples of the Chandler period T = 1.2 yr. and the principal period of nutation 18.6 yr. A nonlinear model for the Chandler polar motion has been constructed based on this empirical fact. In this model, the ENSO excites the Chandler polar motion by acting on the Earth at the frequencies of combinative resonance. At the same time, the Chandler polar motion induces a polar tide in the atmosphere and the World Ocean, which orders the ENSO. As a result, the dominant components in the noise spectrum of the ENSO are those with the periods indicated above.

Type
Part 5. Chandler and Annual Polar Motion: Observations and Excitation
Information
International Astronomical Union Colloquium , Volume 178: Polar Motion: Historical and Scientific Problems , 2000 , pp. 455 - 462
Copyright
Copyright © Astronomical Society of the Pacific 2000

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