The role of the basic state in the ENSO-monsoon relationship and implications for predictability

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Turner, A.G. ; Inness, P.M. ; Slingo, J.M. (2005)

The impact of systematic model errors on a coupled simulation of the Asian Summer monsoon and its interannual variability is studied. Although the mean monsoon climate is reasonably well captured, systematic errors in the equatorial Pacific mean that the monsoon-ENSO teleconnection is rather poorly represented in the GCM. A system of ocean-surface heat flux adjustments is implemented in the tropical Pacific and Indian Oceans in order to reduce the systematic biases. In this version of the GCM, the monsoon-ENSO teleconnection is better simulated, particularly the lag-lead relationships in which weak monsoons precede the peak of El Nino. In part this is related to changes in the characteristics of El Nino, which has a more realistic evolution in its developing phase. A stronger ENSO amplitude in the new model version also feeds back to further strengthen the teleconnection. These results have important implications for the use of coupled models for seasonal prediction of systems such as the monsoon, and suggest that some form of flux correction may have significant benefits where model systematic error compromises important teleconnections and modes of interannual variability.
  • References (33)
    33 references, page 1 of 4

    Response of the Indian Monsoon and ENSO-monsoon teleconnections to enhanced greenhouse effect in the CNRM coupled model. J. Meteorol. Soc. Jpn., 81, 779-803

    'Predictability of monsoons'. Pp. 99-109 in Monsoon Dynamics. Eds. J. Lighthill and R. P. Pearce, Cambridge University Press, Cambridge, UK

    Influence of mean state changes on the structure of ENSO in a tropical coupled GCM. J. Climate, 14, 730-742

    Monsoon precipitation in the AMIP runs. Clim. Dyn., 14, 659- 689

    The simulation of SST, sea ice extents and ocean heat transports in a version of the Hadley Centre coupled model without flux adjustments. Clim. Dyn., 16, 147-168

    Representing El Nin╦ťo in coupled ocean-atmosphere GCMs: the dominant role of the atmospheric component. J. Climate, 17, 4623-4629

    Organization of tropical convection in a GCM with varying vertical resolution: Implications for the simulation of the Madden-Julian Oscillation. Clim. Dyn., 17, 777-793

    Simulation of the Madden-Julian Oscillation in a coupled general circulation model. Part II: The role of the basic state. J. Climate, 16, 365-382

    Climate change 2001: The scientific basis. Contribution of Working Group I to the Third Assessment Report, Eds. J. T. Houghton, Y. Ding, D. J. Griggs, M. Noguer, P. J. van der Linden, X. Dai, K. Maskell and C. A. Johnson, Cambridge University Press, UK

    Anthropogenic climate change for 1860 to 2100 simulated with the HadCM3 model under updated emission scenarios. Clim. Dyn., 20, 583-612

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