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Original Research Papers

Linear solutions for the frequency and amplitude modulation of ENSO by the annual cycle

Authors:

Soon-Il An ,

Department of Atmospheric Sciences, Yonsei University, Seoul, KR
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Fei-Fei Jin

Department of Meteorology, University of Hawaii, Hawaii, HI, US
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Abstract

We obtained linear solutions for the frequency and amplitude modulations of the El Ni˜no-Southern Oscillation (ENSO) by the annual cycle using a modified harmonic oscillator equation. The frequency modulation by the annual cycle was capable of changing the ENSO phases and dominant frequency, but could not modify the ENSO amplitude. On the other hand, the amplitude modulation by the annual cycle intensifies the ENSO variability and also induces seasonal amplitude locking. The intensification rate of the ENSO amplitude with respect to the annual cycle becomes less sensitive in low-frequency regime of ENSO.

How to Cite: An, S.-I. and Jin, F.-F., 2011. Linear solutions for the frequency and amplitude modulation of ENSO by the annual cycle. Tellus A: Dynamic Meteorology and Oceanography, 63(2), pp.238–243. DOI: http://doi.org/10.1111/j.1600-0870.2010.00482.x
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  Published on 01 Jan 2011
 Accepted on 27 Aug 2010            Submitted on 17 Jan 2010

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