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기후물리 연구단
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Revisiting ENSO/Indian Ocean Dipole phase relationships

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Title
Revisiting ENSO/Indian Ocean Dipole phase relationships
Author(s)
Malte F. Stuecker; Axel Timmermann; Fei-Fei Jin; Yoshimitsu Chikamoto; Wenjun Zhang; Andrew T. Wittenberg; Esther Widiasih; Sen Zhao
Publication Date
2017-03
Journal
GEOPHYSICAL RESEARCH LETTERS, v.44, no.5, pp.2481 - 2492
Publisher
AMER GEOPHYSICAL UNION
Abstract
Here we show that the characteristics of the Indian Ocean Dipole (IOD), such as its power spectrum and phase relationship with the El Nino-Southern Oscillation (ENSO), can be succinctly explained by ENSO combination mode (C-mode) wind and heat flux forcing together with a seasonal modulation of the air/sea coupled Indian Ocean (IO) Bjerknes feedback. This model explains the observed high-frequency near-annual IOD variability in terms of deterministic ENSO/annual cycle interactions. ENSO-independent IOD events can be understood as a seasonally modulated ocean response to white noise atmospheric forcing. Under this new physical null hypothesis framework, IOD predictability is determined by both ENSO predictability and the ENSO signal-to-noise ratio. We further emphasize that lead/lag correlations between different climate variables are easily misinterpreted when not accounting properly for the seasonal modulation of the underlying climate phenomena. © 2017. American Geophysical Union. All Rights Reserved.
URI
https://pr.ibs.re.kr/handle/8788114/4143
ISSN
0094-8276
Appears in Collections:
Center for Climate Physics(기후물리 연구단) > Journal Papers (저널 논문)
Files in This Item:
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