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http://dx.doi.org/10.14191/Atmos.2015.25.3.559

The Fine Power Spectra of the Southern Oscillation Index and Its Components and their Implication  

Lim, G.-H. (School of Earth and Environmental Sciences, College of Natural Sciences, Seoul National University)
Suh, Y.-C. (Department of Civil Engineering, Pukyong National University)
Publication Information
Atmosphere / v.25, no.3, 2015 , pp. 559-568 More about this Journal
Abstract
As is evident from its definition, Southern Oscillation Index variability conformed to a combination of the variations of Darwin and Tahiti pressure. Over the El-$Ni{\tilde{n}}o$ Southern Oscillation spectra, the Darwin pressure shared variations associated with the SSN tendency while the Tahiti had a connection with the stratospheric quasi-biennial oscillation modulating annual cycle. The power peak near the 3.5-year period comprised the third harmonic of the sun and the second of the modulated annual cycle. The derived harmonics came from both sources, so the initiation of El-$Ni{\tilde{n}}o$ could be predicted more successfully when including the effects of the sun and QBO.
Keywords
SOI; QBO; ENSO; SSN; modulation; spread spectrum;
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