Is there an Indian Ocean dipole and is it independent of the El Niño-Southern Oscillation?

Allan, Robert J. and Chambers, Don and Drosdowsky, Wasyl and Hendon, Harry and Latif, Mojib and Nicholls, Neville and Smith, Ian and Stone, Roger C. and Tourre, Yves (2001) Is there an Indian Ocean dipole and is it independent of the El Niño-Southern Oscillation? CLIVAR Exchanges, 6 (3 (no.). pp. 18-22. ISSN 1026 - 0471


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The papers by Saji et al (1999) and Webster et al (1999) describe an equatorial Indian Ocean sea surface temperature (SST) dipole pattern (IOD) which they claim modulates rainfall in East Africa and Indonesia, and operates independently of the global-scale El Nino-Southern Oscillation (ENSO). The concept of possible independence of Indian Ocean SST variability form ENSO has been shaped by research focusing on climate events during the 1990s (eg Behera et al, 1999; Murtugudde et al., 2000). However, in an earlier paper Nicholls (1989) describes a different IOD pattern of variability related to Australian winter rainfall, and argues that this pattern operates largely independently of ENSO. In this paper we demonstrate clearly that with consideration of the evolution of ENSO events, the varying lag correlations between IOD end ENSO indices, and using seasonally stratified data, the apparent ENSO independence disappears form both IODs.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: No
Item Status: Live Archive
Additional Information: Key paper on the issue of the relationship between Indian Ocean SST variability and supposed independence from El Nino/Southern Oscillation. Note on Copyright. Permission to use any scientific material (text as well as figures) published in CLIVAR-Exchanges should be obtained from the authors, who hold copyright.
Faculty / Department / School: Historic - Faculty of Sciences - Department of Biological and Physical Sciences
Date Deposited: 11 Oct 2007 01:16
Last Modified: 02 Jul 2013 22:48
Uncontrolled Keywords: Indian Ocean sea surface temperature variability; ENSO
Fields of Research : 04 Earth Sciences > 0406 Physical Geography and Environmental Geoscience > 040605 Palaeoclimatology
04 Earth Sciences > 0401 Atmospheric Sciences > 040105 Climatology (excl.Climate Change Processes)
04 Earth Sciences > 0405 Oceanography > 040503 Physical Oceanography

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