Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997arep...41..705s&link_type=abstract
Astronomy Reports, Volume 41, Issue 5, September 1997, pp.705-708
Astronomy and Astrophysics
Astronomy
1
Scientific paper
The redistribution of air and water masses between the Pacific and Indian oceans during the El Nino 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. Except for 2.8 yr, these periods are all multiples of the Chandler period T = 1.2 yr. A nonlinear model for the Chandler polar motion (CPM) has been constructed based on this empirical fact. In this model, the ENSO excites the CPM by acting on the Earth at the frequencies of combination resonances. At the same time, the CPM 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.
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