The authors thank Peter Webster for useful discussions and for suggesting the TOGA COARE forecasting experiments. S. J. Woolnough was supported by the Natural Environment Research Council Grant NER/A/S/2000/1283 and thanks ECMWF for additional support.
Anderson, D., and M. A. Balmaseda, 2004: Overview of ocean models at ECMWF. Proc. Seminar on Recent Developments in Data Assimilation for Atmosphere and Ocean, Shinfield Park, Reading, United Kingdom, ECMWF, 103–111.
Anderson, D., and Coauthors, 2003: Comparison of the ECMWF seasonal forecast systems 1 and 2, including the relative performance for the 1997/8 El Nino. ECMWF Tech. Memo. 404, 95 pp. [Available online at http://www.ecmwf.int/publications/library/ecpublications/_pdf/tm/401-500/tm404.pdf.].
Balmaseda, M. A., 2004: Ocean data assimilation for seasonal forecasts. Proc. Seminar on Recent Developments in Data Assimilation for Atmosphere and Ocean, Shinfield Park, Reading, United Kingdom, ECMWF, 301–326.
Balmaseda, M. A., 2005: Ocean analysis at ECMWF: From real-time ocean initial conditions to historical ocean reanalysis. ECMWF Newsletter, No. 3, ECMWF, Reading, United Kingdom, 24–32.
Buizza, R., and T. N. Palmer, 1995: The singular-vector structure of the atmospheric global circulation. J. Atmos. Sci., 52 , 1434–1456.
Ferranti, L., T. N. Palmer, F. Molteni, and E. Klinker, 1990: Tropical–extratropical interaction associated with the 30–60-day oscillation and its impact on medium and extended range prediction. J. Atmos. Sci., 47 , 2177–2199.
Hendon, H. H., and B. Liebmann, 1990: A composite study of onset of the Australian summer monsoon. J. Atmos. Sci., 47 , 2227–2240.
Large, W. G., J. M. Williams, and S. Doney, 1994: Oceanic vertical mixing: A review and a model with a nonlocal boundary layer parameterization. Rev. Geophys., 32 , 363–403.
Lin, J-L., and Coauthors, 2006: Tropical intraseasonal variability in 14 IPCC AR4 climate models. Part I: Convective signals. J. Climate, 19 , 2665–2690.
Lin, Y-L., R. D. Farley, and H. D. Orville, 1983: Bulk parameterization of the snow field in a cloud model. J. Climate Appl. Meteor., 22 , 1065–1092.
Madden, R. A., and P. R. Julian, 1971: Detection of a 40–50-day oscillation in the zonal wind in the tropical Pacific. J. Atmos. Sci., 28 , 702–708.
Maloney, E. D., and D. L. Hartmann, 2000: Modulation of eastern North Pacific hurricanes by the Madden–Julian oscillation. J. Climate, 13 , 1451–1460.
Maloney, E. D., and D. L. Hartmann, 2001: The sensitivity of intraseasonal variability in the NCAR CCM3 to changes in convective parameterization. J. Climate, 14 , 2015–2034.
Maloney, E. D., and D. L. Hartmann, 2002: Modulation of hurricane activity in the Gulf of Mexico by the Madden-Julian oscillation. Science, 287 , 2002–2004.
Mo, K. C., 2000: The association between intraseasonal oscillations and tropical storms in the Atlantic basin. Mon. Wea. Rev., 128 , 4097–4107.
Palmer, T. N., 2001: A nonlinear dynamical perspective on model error: A proposal for non-local stochastic dynamic parameterization in weather and climate prediction models. Quart. J. Roy. Meteor. Soc., 127 , 279–304.
Puri, K., J. Barkmeijer, and T. Palmer, 2001: Tropical singular vectors computed with linearized diabatic physics. Quart. J. Roy. Meteor. Soc., 127 , 709–731.
Slingo, J. M., and Coauthors, 1996: Intraseasonal oscillations in 15 atmospheric general circulation models: Results from an AMIP diagnostic subproject. Climate Dyn., 12 , 325–357.
Sundqvist, H., E. Berge, and J. E. Kristjansson, 1989: Condensation and cloud parameterization studies with a mesoscale numerical weather prediction model. Mon. Wea. Rev., 117 , 1641–1657.
Tiedtke, M., 1989: A comprehensive mass flux scheme for cumulus parameterization in large-scale models. Mon. Wea. Rev., 117 , 1779–1800.
Tokioka, T., K. Yamazaki, A. Kitoh, and T. Ose, 1988: The equatorial 30–60 day oscillation and the Arakawa-Schubert penetrative cumulus parameterization. J. Meteor. Soc. Japan, 66 , 883–901.
Tompkins, A. M., and G. C. Craig, 1998: Radiative-convective equilibrium in a three-dimensional cloud ensemble model. Quart. J. Roy. Meteor. Soc., 124 , 2073–2097.
Tompkins, A. M., and T. Jung, 2003: Influence of process interactions on MJO-like convective structures in the IFS model. Proc. ECMWF/CLIVAR Workshop on Simulation and Prediction of Intra-Seasonal Variability with the Emphasis on the MJO, Shinfield Park, Reading, United Kingdom, ECMWF, 103–114. [Available online at http://www.ecmwf.int/publications/library/ecpublications/_pdf/workshop/2003/MJO/ws_mjo_tompkins.pdf.].
Tompkins, A. M., K. Gierens, and G. Rädel, 2007: Ice supersaturation in the ECMWF integrated forecast system. Quart. J. Roy. Meteor. Soc., 133 , 53–63.
Vialard, J., F. Vitart, M. Balmaseda, T. Stockdale, and D. Anderson, 2005: An ensemble generation method for seasonal forecasting with an ocean–atmosphere coupled model. Mon. Wea. Rev., 133 , 441–453.
Vitart, F., 2003: Monthly forecasting system. ECMWF Tech. Memo. 424, 70 pp. [Available online at http://www.ecmwf.int/publications/library/ecpublications/_pdf/tm/401-500/tm424.pdf.].
Vitart, F., J. Anderson, J. Sirutis, and R. Tuleya, 2001: Sensitivity of tropical storms simulated by a general circulation model to changes in cumulus parametrization. Quart. J. Roy. Meteor. Soc., 127 , 25–51.
Vitart, F., M. A. Balmaseda, L. Ferranti, and D. Anderson, 2003: Westerly wind events and the 1997/98 El Niño event in the ECMWF seasonal forecasting system: A case study. J. Climate, 16 , 3153–3170.
Waliser, D. E., C. Jones, J-K. E. Schemm, and N. E. Graham, 1999a: A statistical extended-range tropical forecast model based on the slow evolution of the Madden–Julian oscillation. J. Climate, 12 , 1918–1939.
Waliser, D. E., K. Lau, and J-H. Kim, 1999b: The influence of coupled sea surface temperatures on the Madden–Julian oscillation: A model perturbation experiment. J. Atmos. Sci., 56 , 333–358.
Waliser, D. E., K. Lau, W. Stern, and C. Jones, 2003: Potential predictability of the Madden–Julian oscillation. Bull. Amer. Meteor. Soc., 84 , 33–50.
Wang, S., and Q. Wang, 1999: On condensation and evaporation in turbulence cloud parameterizations. J. Atmos. Sci., 56 , 3338–3344.
Wang, W., and M. Schlessinger, 1999: The dependence on convective parameterization of the tropical intraseasonal oscillation simulated by the UIUC 11-layer atmospheric GCM. J. Climate, 12 , 1423–1457.
Wheeler, M. C., and K. Weickmann, 2001: Real-time monitoring and prediction of modes of coherent synoptic to intraseasonal tropical variability. Mon. Wea. Rev., 129 , 2677–2694.
Wheeler, M. C., and H. H. Hendon, 2004: An all-season real-time multivariate MJO index: Development of an index for monitoring and prediction. Mon. Wea. Rev., 132 , 1917–1932.
Wolff, J., E. Maier-Raimer, and S. Legutke, 1997: The Hamburg ocean primitive equation model. Deutsches Klimarechenzentrum Tech. Rep. 13, 98 pp.
Woolnough, S. J., F. Vitart, and M. Balmaseda, 2007: The role of the ocean in the Madden-Julian Oscillation: Sensitivity of an MJO forecast to ocean coupling. Quart. J. Roy. Meteor. Soc., 133 , 117–128.
Yasunari, T., 1979: Cloudiness fluctuations associated with the Northern Hemisphere summer monsoon. J. Meteor. Soc. Japan, 57 , 225–242.