The authors thank Dr. Gurvan Madec and Dr. Pascale Delecluse for fruitful discussions, and Pr. Shukuro Manabe for useful comments, as well as anonymous reviewers whose comments helped to improve this manuscript. We are also very grateful to Dr. Adam Clayton for his great kindness and help in improving manuscript English readability. The authors thank JAMSTEC, especially FRCGC and the Earth Simulator Center, for their great hospitality and the highest-performance material and computer facilities they offer. Dr. Sophie Cravatte, Dr. Fabien Durand, Dr. Jerome Vialard, and all the LEGOS and LOCEAN teams are greatly thanked for their support of this research project. Most of the observations data were made available mainly by NOAA/NCEP/CPC through Climate Diagnostics Center (CDC) and IRI/LDEO Climate Data Library servers. QuikScat data are produced by Remote Sensing Systems and sponsored by the NASA Ocean Vector Winds Science Team. Those data were obtained from the IFREMER (CERSAT) ftp server. Some of the rainfall data used in this study were acquired as part of the Tropical Rainfall Measuring Mission (TRMM; sponsored by Japan NASDA and U.S. NASA Office of Earth Sciences, and distributed by the Goddard Distributed Active Archive Center). The authors also wish to acknowledge the use of NOAA/PMEL Ferret program for analysis and graphics in this paper, as well as to thank Dr. Pascal Terray for the use of Statpacks, the statistical analysis package he developed. This work was mostly funded by the Japan Society for the Promotion of Science (JSPS), and partly by the Institut Pierre-Simon Laplace (IPSL).
Alory, G., , S. Wijffels, , and G. Meyers, 2007: Observed temperature trends in the Indian Ocean over 1960–1999 and associated mechanisms. Geophys. Res. Lett., 34 .L02606, doi:10.1029/2006GL028044.
Annamalai, H., , and R. Murtugudde, 2004: Role of the Indian Ocean in regional climate variability. Earth’s Climate: The Ocean–Atmosphere Interaction, Geophys. Monogr., Vol. 147, Amer. Geophys. Union, 213–246.
Annamalai, H., , and P. Liu, 2005: Response of the Asian summer monsoon to changes in El Niño properties. Quart. J. Roy. Meteor. Soc., 131 , 805–831.
Annamalai, H., , and K. R. Sperber, 2005: Regional heat sources and the active and break phases of boreal summer intraseasonal (30–50 day) variability. J. Atmos. Sci., 62 , 2726–2748.
Annamalai, H., , P. Liu, , and S. P. Xie, 2005: Southwest Indian Ocean SST variability: Its local effect and remote influence on Asian monsoons. J. Climate, 18 , 4150–4167.
Annamalai, H., , K. Hamilton, , and K. R. Sperber, 2007: South Asian summer monsoon and its relationship with ENSO in the IPCC AR4 simulation. J. Climate, 20 , 1071–1092.
Arpe, K., , L. Dümenil, , and M. A. Giorgetta, 1998: Variability of the Indian monsoon in the ECHAM3 model: Sensitivity to sea surface temperature, soil moisture, and the stratospheric quasi-biennial oscillation. J. Climate, 11 , 1837–1858.
Ashok, K., , Z. Y. Guan, , and T. Yamagata, 2001: Impact of the Indian Ocean Dipole on the relationship between the Indian monsoon rainfall and ENSO. Geophys. Res. Lett., 28 , 4499–4502.
Behera, S. K., , J-J. Luo, , S. Masson, , S. A. Rao, , H. Sakuma, , and T. Yamagata, 2006: A GCM study on the interaction between IOD and ENSO. J. Climate, 19 , 1688–1705.
Brock, J., , and C. McClain, 1992: Interannual variability in phytoplankton blooms observed in the northwestern Arabian Sea during the southwest monsoon. J. Geophys. Res., 97 , C1. 733–750.
Cadet, D. L., , and S. Greco, 1987: Water-vapor transport over the Indian Ocean during the 1979 summer monsoon. Part I. Water vapor fluxes. Mon. Wea. Rev., 115 , 653–663.
Chen, M. Y., , P. P. Xie, , J. E. Janowiak, , and P. Arkin, 2002: Global land precipitation: A 50-yr monthly analysis based on gauge observations. J. Hydrometeor., 3 , 249–266.
de Boyer Montégut, C., , G. Madec, , A. S. Fischer, , A. Lazar, , and D. Iudicone, 2004: Mixed layer depth over the global ocean: An examination of profile data and a profile-based climatology. J. Geophys. Res., 109 .C12003, doi:10.1029/2004JC002378.
de Boyer Montégut, C., , J. Vialard, , S. S. Shenoi, , D. Shankar, , F. Durand, , C. Ethé, , and G. Madec, 2007: Simulated seasonal and interannual variability of mixed layer heat budget in the northern Indian Ocean. J. Climate, 20 , 3249–3268.
Duvel, J-P., , H. Bellenger, , C. Basdevant, , G. Reverdin, , A. Vargas, , and J. Vialard, 2008: The Aeroclipper: A new device to explore convective systems and cyclones. Bull. Amer. Meteor. Soc., in press.
Findlater, J., 1969: A major low-level air current near the Indian Ocean during the northern summer. Quart. J. Roy. Meteor. Soc., 95 , 362–380.
Fischer, A. S., , R. A. Weller, , D. L. Rudnick, , C. C. Eriksen, , C. M. Lee, , K. H. Brink, , C. A. Fox, , and R. R. Leben, 2002: Mesoscale eddies, coastal upwelling, and the upper-ocean heat budget in the Arabian Sea. Deep-Sea Res. II, 49 , 2231–2264.
Goes, J. I., , P. G. Thoppil, , H. R. Gomes, , and J. T. Fasullo, 2005: Warming of the Eurasian landmass is making the Arabian Sea more productive. Science, 308 , 545–548.
Hahn, D. G., , and J. Shukla, 1976: An apparent relationship between Eurasian snow cover and Indian monsoon rainfall. J. Atmos. Sci., 33 , 2461–2462.
Hermes, J. C., , and C. J. C. Reason, 2008: Annual cycle of the South Indian Ocean (Seychelles-Chagos) thermocline ridge in a regional ocean model. J. Geophys. Res., 113 .C04035, doi:10.1029/2007JC004363.
Huang, B., , and J. L. Kinter, 2002: Interannual variability in the tropical Indian Ocean. J. Geophys. Res., 107 .3199, doi:10.1029/2001JC001278.
Huang, B., , and J. Shukla, 2007a: Mechanisms for the interannual variability in the tropical Indian Ocean. Part I: The role of remote forcing from the tropical Pacific. J. Climate, 20 , 2917–2936.
Huang, B., , and J. Shukla, 2007b: Mechanisms for the interannual variability in the tropical Indian Ocean. Part II: Regional processes. J. Climate, 20 , 2937–2960.
Joseph, P. V., 1990: Monsoon variability in relation to equatorial trough activity over India and west Pacific Oceans. Mausam, 41 , 291–296.
Joseph, P. V., , J. K. Eischeid, , and R. J. Pyle, 1994: Interannual variability of the onset of the Indian summer monsoon and its association with atmospheric features, El Niño and sea surface temperature anomalies. J. Climate, 7 , 81–105.
Kistler, R., and Coauthors, 2001: The NCEP–NCAR 50-Year Reanalysis: Monthly means CD-ROM and documentation. Bull. Amer. Meteor. Soc., 82 , 247–267.
Kitoh, A., 2007: Variability of Indian monsoon-ENSO relationship in a 1000-year MRI-CGCM2.2 simulation. Nat. Hazards, 42 , 261–272.
Krishna Kumar, K., , B. Rajagopalan, , and M. Cane, 1999: On the weakening relationship between the Indian monsoon and ENSO. Science, 284 , 2156–2159.
Krishna Kumar, K., , B. Rajagopalan, , M. Hoerling, , G. Bates, , and M. Cane, 2006: Unraveling the mystery of Indian monsoon failure during El Niño. Science, 314 , 115–119.
Lawrence, D. M., , and P. J. Webster, 2001: Interannual variations of the intraseasonal oscillation in the South Asian summer monsoon region. J. Climate, 14 , 2910–2922.
Lee, T., 2004: Decadal weakening of the shallow overturning circulation in the south Indian Ocean. Geophys. Res. Lett., 31 .L18305, doi:10.1029/2004GL020884.
Lévy, M., , D. Shankar, , J-M. André, , S. S. C. Shenoi, , F. Durand, , and C. de Boyer Montégut, 2007: Basin-wide seasonal evolution of the Indian Ocean’s phytoplankton blooms. J. Geophys. Res., 112 .C12014, doi:10.1029/2007JC004090.
Li, T., , C-W. Tham, , and C-P. Chang, 2001: A coupled air–sea–monsoon oscillator for the tropospheric biennial oscillation. J. Climate, 14 , 752–764.
Loschnigg, J., , and P. J. Webster, 2000: A coupled ocean–atmosphere system of SST modulation for the Indian Ocean. J. Climate, 13 , 3342–3360.
Loschnigg, J., , G. A. Meehl, , P. J. Webster, , J. M. Arblaster, , and G. P. Compo, 2003: The Asian monsoon, the tropospheric biennial oscillation and the Indian Ocean Dipole in the NCAR CSM. J. Climate, 16 , 1617–1642.
Luo, J-J., , S. Masson, , S. K. Behera, , P. Delecluse, , S. Gualdi, , A. Navarra, , and T. Yamagata, 2003: South Pacific origin of the decadal ENSO-like variation as simulated by a coupled GCM. Geophys. Res. Lett., 30 .2250, doi:10.1029/2003GL018649.
Luo, J-J., , S. Masson, , S. K. Behera, , S. Shingu, , and T. Yamagata, 2005a: Seasonal climate predictability in a coupled OAGCM using a different approach for ensemble forecasts. J. Climate, 18 , 4474–4497.
Luo, J-J., , S. Masson, , E. Roeckner, , G. Madec, , and T. Yamagata, 2005b: Reducing climatology bias in an ocean–atmosphere CGCM with improved coupling physics. J. Climate, 18 , 2344–2360.
Luo, J-J., , S. Masson, , S. K. Behera, , and T. Yamagata, 2007: Experimental forecasts of Indian Ocean Dipole using a coupled OAGCM. J. Climate, 20 , 2178–2190.
Luo, J-J., , S. Masson, , S. K. Behera, , and T. Yamagata, 2008: Extended ENSO predictions using a fully coupled ocean–atmosphere model. J. Climate, 21 , 84–93.
Madden, R. A., , and P. R. Julian, 1972: Description of global-scale circulation cells in the tropics with a 40-50 day period. J. Atmos. Sci., 29 , 1109–1123.
Madec, G., , P. Delecluse, , M. Imbard, , and C. Levy, 1998: OPA 8.1 ocean general circulation model reference manual. Notes du pôle de modélisation de l’IPSL 11, 91 pp. [Available online at http://www.lodyc.jussieu.fr/NEMO/general/manual/Doc_OPA8.1.pdf.].
Masson, S., and Coauthors, 2005: Impact of barrier layer on winter-spring variability of the southeastern Arabian Sea. Geophys. Res. Lett., 32 .L07703, doi:10.1029/2004GL021980.
Masumoto, Y., , and G. Meyers, 1998: Forced Rossby waves in the southern tropical Indian Ocean. J. Geophys. Res., 103 , 27589–27602.
Mathew, R., , and Y. Tanimoto, 2007: Role of SST over the Indian Ocean in influencing the intraseasonal variability of the Indian summer monsoon. J. Meteor. Soc. Japan, 85 , 349–358.
Meehl, G. A., , and J. M. Arblaster, 2001: The tropospheric biennial oscillation and Indian monsoon rainfall. Geophys. Res. Lett., 28 , 1731–1734.
Meehl, G. A., , and J. M. Arblaster, 2002a: The tropospheric biennial oscillation and Asian–Australian monsoon rainfall. J. Climate, 15 , 722–744.
Meehl, G. A., , and J. M. Arblaster, 2002b: Indian monsoon GCM sensitivity experiments testing tropospheric biennial oscillation transition conditions. J. Climate, 15 , 923–944.
Meehl, G. A., , J. M. Arblaster, , and J. Loschnigg, 2003: Coupled ocean–atmosphere dynamical processes in the tropical Indian and Pacific Ocean regions and the TBO. J. Climate, 16 , 2138–2158.
Meehl, G. A., , C. Covey, , B. McAvaney, , M. Latif, , and R. J. Stouffer, 2005: Overview of the Coupled Model Intercomparison Project. Bull. Amer. Meteor. Soc., 86 , 89–93.
Mooley, D. A., , and B. Parthasarathy, 1984: Fluctuations in all-India summer monsoon rainfall during 1871-1978. Climatic Change, 6 , 287–301.
Mooley, D. A., , and D. A. Paolino Jr., 1988: A predictive monsoon signal in the surface level thermal field over India. Mon. Wea. Rev., 116 , 339–352.
Mooley, D. A., , B. Parthasarathy, , and G. B. Pant, 1986: Relationships between Indian summer monsoon rainfall and location of the ridge at the 500-mb level along 75°E. J. Climate Appl. Meteor., 25 , 633–640.
Murtugudde, R., , and A. J. Busalacchi, 1999: Interannual variability of the dynamics and thermodynamics of the tropical Indian Ocean. J. Climate, 12 , 2300–2326.
Murtugudde, R., , J. P. McCreary, , and A. J. Busalacchi, 2000: Oceanic processes associated with anomalous events in the Indian Ocean with relevance to 1997–1998. J. Geophys. Res., 105 , 3295–3306.
Murtugudde, R., , R. Seager, , and P. Thoppil, 2008: Arabian Sea response to monsoon variations. Paleooceanography, 22 .PA4217, doi:10.1029/2007PA001467.
Ninomiya, K., , and C. Kobayashi, 1999: Precipitation and moisture balance of the Asian summer monsoon in 1991 Part II: Moisture transport and moisture balance. J. Meteor. Soc. Japan, 77 , 77–99.
Nitta, T., , and S. Yamada, 1989: Recent warming of tropical sea surface temperature and its relationship to the Northern Hemisphere circulation. J. Meteor. Soc. Japan, 67 , 375–383.
Ogasawara, N., , A. Kitoh, , T. Yasunari, , and A. Noda, 1999: Tropospheric biennial oscillation of the ENSO-monsoon system in the MRI coupled GCM. J. Meteor. Soc. Japan, 77 , 1247–1270.
Parthasarathy, B., , H. F. Diaz, , and J. K. Eischeid, 1988: Prediction of all-India summer monsoon rainfall with regional and large-scale parameters. J. Geophys. Res., 93 , 5341–5350.
Parthasarathy, B., , K. Rupa Kumar, , and V. R. Deshpande, 1991a: Indian summer monsoon rainfall and 200 mb meridional wind index: Application for long-range prediction. Int. J. Climatol., 11 , 165–176.
Parthasarathy, B., , K. Rupa Kumar, , and A. A. Munot, 1991b: Evidence of secular variations in Indian monsoon rainfall–circulation relationships. J. Climate, 4 , 927–938.
Parthasarathy, B., , K. Rupa Kumar, , and A. A. Munot, 1992: Surface pressure and summer monsoon rainfall over India. Adv. Atmos. Sci., 9 , 359–366.
Périgaud, C., , and P. Delecluse, 1993: Interannual sea level variations in the tropical Indian Ocean from Geosat and shallow water simulations. J. Phys. Oceanogr., 23 , 1916–1934.
Rao, K. G., , and B. N. Goswami, 1988: Interannual variations of sea surface temperature over the Arabian Sea and the Indian monsoon: A new perspective. Mon. Wea. Rev., 116 , 558–568.
Rao, S. A., , and S. K. Behera, 2005: Subsurface influence on SST in the tropical Indian Ocean: Structure and interannual variability. Dyn. Atmos. Oceans, 39 , 103–135.
Reverdin, G., , D. Cadet, , and D. Gutzler, 1986: Interannual displacements of convection and surface circulation over the equatorial Indian Ocean. Quart. J. Roy. Meteor. Soc., 112 , 43–46.
Reynolds, R. W., , N. A. Rayner, , T. M. Smith, , D. C. Stokes, , and W. Wang, 2002: An improved in situ and satellite SST analysis for climate. J. Climate, 15 , 1609–1625.
Roeckner, E., and Coauthors, 1996: The atmospheric general circulation model ECHAM-4: Model description and simulation of present-day climate. Max-Planck-Institut für Meteorologie Rep. 218, 90 pp.
Saji, N. H., , B. N. Goswami, , P. N. Vinayachandran, , and T. Yamagata, 1999: A dipole mode in the tropical Indian Ocean. Nature, 401 , 360–363.
Schoenefeldt, R., , and F. A. Schott, 2006: Decadal variability of the Indian Ocean cross-equatorial exchange in SODA. Geophys. Res. Lett., 33 .L08602, doi:10.1029/2006GL025891.
Schott, F. A., , M. Dengler, , and R. Schoenefeldt, 2002: The shallow overturning circulation of the Indian Ocean. Prog. Oceanogr., 53 , 57–103.
Schott, F. A., , S-P. Xie, , and J. P. McCreary Jr., 2008: Indian Ocean circulation and climate variability. Rev. Geophys., in press.
Shukla, J., 1975: Effect of Arabian sea-surface temperature anomaly on Indian summer monsoon: A numerical experiment with the GFDL model. J. Atmos. Sci., 32 , 503–511.
Shukla, J., 1987: Interannual variability of monsoons. Monsoons, J. S. Fein and P. L. Stephens, Eds., J. Wiley and Sons, 339–463.
Slingo, J., , H. Spencer, , B. Hoskins, , P. Berrisford, , and E. Black, 2004: The meteorology of the western Indian Ocean and the influence of the east African highlands. Philos. Trans. Roy. Soc. London, A363 , 25–42.
Terray, P., , and S. Dominiak, 2005: Indian Ocean sea surface temperature and El Niño–Southern Oscillation: A new perspective. J. Climate, 18 , 1351–1368.
Terray, P., , F. Chauvin, , and H. Douville, 2007: Impact of southeast Indian Ocean sea surface temperature anomalies on monsoon-ENSO-dipole variability in a coupled ocean-atmosphere model. Climate Dyn., 28 , 553–580.
Valcke, S., , L. Terray, , and A. Piacentini, 2000: The OASIS coupler user guide version 2.4. CERFACE Tech. Rep. TR/CGMC/ 00-10, 85 pp.
Vecchi, G. A., , and D. E. Harrison, 2004: Interannual Indian rainfall variability and Indian Ocean sea surface temperature anomalies. Earth’s Climate: The Ocean–Atmosphere Interaction, Geophys. Monogr., Vol. 147, Amer. Geophys. Union, 247–259.
Vialard, J., and Coauthors, 2008: Cirene: Air–sea interactions in the Seychelles-Chagos thermocline ridge region. Bull. Amer. Meteor. Soc., in press.
Walker, G. T., 1924: Correlations in seasonal variations of weather, IX. A further study of world weather, World Weather II. Mem. India Meteor. Dep., 24 , 275–332.
Washington, W. M., , R. M. Chervin, , and G. V. Rao, 1977: Effects of a variety of Indian Ocean surface temperature anomaly patterns on the summer monsoon circulation: Experiments with the NCAR general circulation model. Pure Appl. Geophys., 115 , 1335–1356.
Webster, P. J., , V. Magaña, , T. Palmer, , J. Shukla, , R. Tomas, , M. Yanai, , and T. Yasunari, 1998: Monsoon: Processes, predictability, and the prospects for prediction. J. Geophys. Res., 103 , 14451–14510.
Webster, P. J., , A. M. Moore, , J. P. Loschnigg, , and R. R. Leben