Interactive feedback between ENSO and the Indian Ocean in an interactive ensemble coupled model

Jong Seong Kug, Ben P. Kirtman, In Sik Kang

Research output: Contribution to journalArticlepeer-review

46 Scopus citations

Abstract

An interactive feedback between ENSO and the Indian Ocean is investigated using a Center for Ocean-Land-Atmosphere Studies (COLA) interactive ensemble coupled model. From a long-term simulation of the coupled GCM, it is shown that El Niño events terminate relatively rapidly when the Indian Ocean SST is anomalously warm. The anomalous Indian Ocean warming induces the anomalous easterlies over the western Pacific by modulating the Walker circulation. In turn, the anomalous easterlies generate oceanic-upwelling Kelvin waves over the western Pacific, which propagate eastward and accelerate the decay of the warm SST in the eastern Pacific. As a result, El Niño terminates relatively quickly, and the phase transition from El Niño to La Niña progresses rapidly. These interactive processes are consistent with those derived from the previous observational analyses.

Original languageEnglish (US)
Pages (from-to)6371-6381
Number of pages11
JournalJournal of Climate
Volume19
Issue number24
DOIs
StatePublished - Dec 15 2006
Externally publishedYes

ASJC Scopus subject areas

  • Atmospheric Science

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