Abstract
The Indian Ocean Dipole (IOD) can affect the El Niño–Southern Oscillation (ENSO) state of the following year, in addition to the well-known preconditioning by equatorial Pacific Warm Water Volume (WWV), as suggested by a study based on observations over the recent satellite era (1981–2009). The present paper explores the interdecadal robustness of this result over the 1872–2008 period. To this end, we develop a robust IOD index, which well exploits sparse historical observations in the tropical Indian Ocean, and an efficient proxy of WWV interannual variations based on the temporal integral of Pacific zonal wind stress (of a historical atmospheric reanalysis). A linear regression hindcast model based on these two indices in boreal fall explains 50 % of ENSO peak variance 14 months later, with significant contributions from both the IOD and WWV over most of the historical period and a similar skill for El Niño and La Niña events. Our results further reveal that, when combined with WWV, the IOD index provides a larger ENSO hindcast skill improvement than the Indian Ocean basin-wide mode, the Indian Monsoon or ENSO itself. Based on these results, we propose a revised scheme of Indo-Pacific interactions. In this scheme, the IOD–ENSO interactions favour a biennial timescale and interact with the slower recharge-discharge cycle intrinsic to the Pacific Ocean.
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Acknowledgments
We thank Dr. Sébastien Masson and Dr. Swadhin Behera for constructive comments on this paper. We would like to thank Dr. Lucia Bunge for sending us the ENSO historical indices of Bunge and Clarke (2009), as well as Dr. Tomoki Tozuka, Dr. Pascal Oettli, Dr. Sophie Cravatte, Dr. Caroline Ummenhofer, Dr. Pascal Terray, Hugo Dayan and Chloe Prodhomme for their help and fruitful discussions. We would like to thank the three anonymous reviewers, as well as Dr Julie Arblaster, for their constructive comments. The first author would like to thank Pr. Toshio Yamagata and his colleagues at the University of Tokyo, especially Miss Junko Moriyama, for their hospitality and help during his stay there. The first author was funded by the University of Tokyo (partly through the SATREPS JICA/JST program) and now by the Institut de Recherche pour le Développement (IRD). Matthieu Lengaigne and Jérôme Vialard are funded by IRD. Matthieu Lengaigne gratefully acknowledges the National Institute of Oceanography (NIO, Goa, India) for hosting him during this work. Support for the 20CR project is provided by the US DOE INCITE program, and BER, and by the NOAA Climate Program Office. Also, the NOAA and IRI data libraries were used for this study. The IODhist and WWVhist historical indices constructed here are available at http://www.locean-ipsl.upmc.fr/~Takeshi-Izumo/data.html.
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Izumo, T., Lengaigne, M., Vialard, J. et al. Influence of Indian Ocean Dipole and Pacific recharge on following year’s El Niño: interdecadal robustness. Clim Dyn 42, 291–310 (2014). https://doi.org/10.1007/s00382-012-1628-1
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DOI: https://doi.org/10.1007/s00382-012-1628-1
Keywords
- El Niño–Southern Oscillation (ENSO)
- Indian Ocean Dipole
- Warm Water Volume (WWV) recharge-discharge of the equatorial Pacific Ocean
- Indian and Asian monsoons
- Tropical Tropospheric Biennial Oscillation (TBO)
- Interannual and interdecadal climate variability and predictability
- Walker circulation
- Air-sea interactions
- Tropical Indo-Pacific
- Indian Ocean basin-wide warming/cooling (IOBW)
- Observational uncertainties