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

Soon Il An, Fei Fei Jin

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

We obtained linear solutions for the frequency and amplitude modulations of the El Niño-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.

Original languageEnglish
Pages (from-to)238-243
Number of pages6
JournalTellus, Series A: Dynamic Meteorology and Oceanography
Volume63
Issue number2
DOIs
Publication statusPublished - 2011 Mar 1

All Science Journal Classification (ASJC) codes

  • Oceanography
  • Atmospheric Science

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