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The interannual variability in the tropical Indian Ocean as simulated by a CGCM

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Abstract.

The interannual variability in the tropical Indian Ocean, and in particular the Indian Ocean dipole mode (IODM), is investigated using both observations and a multi-decadal simulations performed by the coupled atmosphere–ocean general circulation model SINTEX. Overall, the characteristics of the simulated IODM are close to the features of the observed mode. Evidence of significant correlations between sea level pressure anomalies in the southeastern Indian Ocean and sea surface temperature anomalies in the tropical Indian and Pacific Oceans have been found both in observations and a multi-decadal simulation. In particular, a positive SLP anomaly in the southeastern part of the basin seems to produce favorable conditions for the development of an IODM event. The role played by the ocean dynamics both in the developing and closing phases of the IODM events is also investigated. Our results suggest that, during the developing phase, the heat content and SST variability associated with the IODM are influenced by a local response of the ocean to the winds, and a remote response with the excitation of Kelvin and Rossby waves. Ocean wave dynamics appear to be important also during the dying phase of the IODM, when equatorial downwelling Kelvin waves transport positive heat content anomalies from the western to the eastern part of the basin, suppressing the zonal heat content anomaly gradient. The results obtained from the model suggest a mechanism for the IODM. This mechanism is generally consistent with the characteristics of the observed IODM. Furthermore, it might give some clue in understanding the correlation between IODM and ENSO activity found both in the model and in the observations.

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References

  • Allan R, and Coauthors (2001) Is there an Indian Ocean dipole, and is it independent of the El Niño–Southern Oscillation? Newsletter Climate Variability and Predictability Programme, 6(3): 18–22 Southampton, UK. Available also at http://www.clivar.org

  • Annamalai H, Murtugudde R, Potemra J, Xie S-P, Wang B (2002) Coupled dynamics in the Indian Ocean: externally or internally forced? Deep-Sea Res (in press)

  • Baquero-Bernal A, Latif M, Legutke M (2002) On dipole-like variability of sea surface temperature in the tropical Indian Ocean. J Clim 15: 1358–1368

    Article  Google Scholar 

  • Black E, Slingo JM, Sperber K (2002) An observational study of the relationship between excessively strong Short Rains in coastal East Africa and Indian Ocean SST. Mon Weather Rev (in press)

  • Behera SK, Krishnam S, Yamagata T (1999) Anomalous air–sea coupling in the southern tropical Indian Ocean during the boreal summer of 1994. Geophys Res Lett 26: 3001–3004

    Article  Google Scholar 

  • Blanke B, Delecluse P (1993) Low frequency variability of the tropical Atlantic ocean simulated by a general circulation model with mixed layer physics. J Phys Oceanogr 23: 1363–1388

    Article  Google Scholar 

  • Chambers DP, Tapley BD, Stewart RH (1999) Anomalous warming in the Indian Ocean coincident with El Niño. J Geophys Res 104: 10,525–10,533

    Article  Google Scholar 

  • Gill AE (1980) Some simple solutions for heat-induced tropical circulation. Q J R Meteorol Soc 106: 447–463

    Google Scholar 

  • Gualdi S, Navarra A (1998) A study of the seasonal variability of the tropical intraseasonal oscillation. Global Atmos Ocean Syst 6: 337–372

    Google Scholar 

  • Gualdi S, Navarra A, Guilyardi E, Delecluse P (2002) Assessment of the tropical Indo-Pacific climate in the SINTEX CGCM. Ann Geophys (in press)

  • Guilyardi E, Madec G, Terray L (2001) The role of lateral ocean physics in the upper ocean thermal balance of a coupled ocean–atmosphere GCM. Clim Dyn 17: 589–599

    Google Scholar 

  • Guilyardi E, Delecluse P, Gualdi S, Navarra A (2002) Mechanisms for ENSO phase change in a coupled GCM. J Clim (in press)

  • Hendon HH, Liebmann B, Glick JD (1997) Oceanic Kelvin waves and the Madden-Julian Oscillation. J Atmos Sci 55: 88–101

    Article  Google Scholar 

  • Huang B, Kinter III JL (2002) The interannual variability in the tropical Indian Ocean. J Geophys Res (in press)

  • Iizuka S, Matsuura T, Yamagata T (2000) The Indian Ocean SST dipole simulated in a coupled general circulation model. Geophys Res Lett 27: 3369–3372

    Google Scholar 

  • Kalnay E, and Coauthors (1996) The NCEP/NCAR 40-year Re-analysis Project. Bull Am Meteorol Soc 77: 437–471

    Article  Google Scholar 

  • Latif M, Barnett TP (1995) Interaction in the tropical Oceans. J Clim 8: 952–964

    Article  Google Scholar 

  • Le Blanc J-L, Boulanger J-P (2001) Propagation and reflection of long equatorial waves in the Indian Ocean from TOPEX/POSEIDON data during the 1993–1998 period. Clim Dyn 17: 547–557

    Article  Google Scholar 

  • Lorenc AC (1984) The evolution of planetary-scale 200 mb divergent flow during the FGGE year. Q J R Meteorol Soc 110: 427–441

    Google Scholar 

  • Madec G, Delecluse P, Imbard M, Levy C (1998) OPA version 8.1 ocean general circulation model reference manual. Technical Report, LODYC/IPSL, Note 11, Paris, France, pp 91

  • Madden RA, Julian PR (1994) Observations of the 40–50 day tropical oscillation – a review. Mon Weather Rev 122: 814–837

    Article  Google Scholar 

  • Masina S, Pinardi N, Navarra A (2001) A global ocean temperature and altimeter data assimilation system for studies of climate variability. Clim Dyn 17: 687–700

    Article  Google Scholar 

  • Masson S, Delecluse P, Boulanger J-P, Menkes C (2002) A model study of the seasonal variability and formation mechanisms of the barrier layer in the eastern equatorial Indian Ocean. J Geophys Res 107: 8017–8037

    Article  Google Scholar 

  • Morcrette JJ (1991) Radiation and cloud radiative properties in the European centre for medium range weather forecasts forecasting system. J Geophys Res 96: 9121–9132

    Google Scholar 

  • Murtugudde RG, McCreary JP, Busalacchi AJ (2000) Oceanic processes associated with anomalous events in the Indian Ocean with relevance to 1997–1998. J Geophys Res 105: 3295–3306

    Article  Google Scholar 

  • Nordeng TE (1994) Extended versions of the convective parametrization scheme at ECMWF and their impact on the mean and transient activity of the model in the Tropics. ECMWF Research Department, Techn Mem 206, October 1994, European Center for Medium Range Weather Forecasts, Reading, UK, pp 41

  • Perigaud C, Delecluse P (1992) Annual sea level variations in the southern tropical Indian Ocean from Geosat and shallow water simulations, J Geophys Res 97: 20,169–20,178

    Google Scholar 

  • Philander SGH (1990) El Niño, La Niña and the Southern Oscillation. Academic, San Diego, California, pp 293

  • Rao SA, Behera SK, Masumoto Y, Yamagata T (2002) Interannual variability in the tropical Indian Ocean with special emphasis on the Indian Ocean Dipole. Deep-Sea Res 49: 1549–1572

    Article  Google Scholar 

  • Rasch PJ, Williamson DL (1990) Computational aspects of moisture transport in global models of the atmosphere. Q J R Meteorol Soc 116: 1071–1090

    Google Scholar 

  • Rayner NA, Parker DE, Frich P, Horton EB, Folland CK, Alexander LV (2000) SST and sea-ice fields for ERA40. Proc 2nd WCRP International Conference on reanalyses, Reading UK August 1999, WCRP-109, WMO/TD-985: 18–21

  • Reverdin G, Cadet D, Gutzler D (1986) Interannual displacements of convection and surface circulation over the equatorial Indian Ocean. Q J R Meteorol Soc 112: 43–67

    Google Scholar 

  • 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, Hamburg, Germany, pp 90

  • Saji NH, Goswami BN, Vinayachandran PN, Yamagata T (1999) A dipole mode in the tropical Indian Ocean. Nature 401: 360–363

    Article  Google Scholar 

  • Slingo JM, Annamalai H (2000) 1997: the El Niño of the century and the response of the Indian summer monsoon. Mon Weather Rev 128: 1778–1797

    Article  Google Scholar 

  • Trenberth KE, Shea DJ (1987) On the evolution of the Southern Oscillation. Mon Weather Rev 115: 3078–3096

    Article  Google Scholar 

  • Tiedtke M (1989) A comprehensive mass flux scheme for cumulus parametrization in large-scale models. Mon Weather Rev 117: 1779–1800

    Article  Google Scholar 

  • Tourre YM, White WB (1997) Evolution of ENSO signals over the Indo-Pacific domain. J Phys Oceanogr 27: 683–696

    Article  Google Scholar 

  • Valcke S, Terray L, Piacentini A (2000) The OASIS coupler user guide version 2.4. Technical Report, TR/CMGC/00-10, CERFACS, Toulouse, France, pp 85

  • Venzke S, Latif M, Villwock A (2000) The coupled GCM ECHO-2, part II: Indian Ocean response to ENSO. J Clim 13: 1371–1383

    Article  Google Scholar 

  • Vinayachandran PN, Saji NH, Yamagata T (1999) Response of the equatorial Indian Ocean to an unusual wind event during 1994. Geophys Res Lett 26: 1613–1615

    Article  Google Scholar 

  • Vinayachandran PN, Iizuka S, Yamagata T (2002) Indian Ocean dipole mode events in an ocean general circulation model. Deep-Sea Res (in press)

  • Webster PJ, Palmer TN, Yanai M, Shukla J, Magnana V, Yasunari T, Tomas R (1998) The monsoon: processes, predictability and prediction. J Geophys Res 103: 14,451–14,510

    Google Scholar 

  • Webster PJ, Moore AM, Loschnigg JP, Leben RR (1999) Coupled ocean–atmosphere dynamics in the Indian Ocean during 1997–98. Nature 401: 356–360

    CAS  Google Scholar 

  • Xie S-P, Annamalai H, Schott FA, McCreary Jr JP (2002) Structure and mechanisms of south Indian Ocean climate variability. J Clim 15: 864–878

    Article  Google Scholar 

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Acknowledgements.

The authors are indebted to Prof. Julia Slingo and to the CGAM tropical group for helpful discussions and suggestions. They are also grateful to Mrs. L. Amato for technical support. Dr. S. Gualdi acknowledges the support of CGAM during his visit to the Meteorological Department of the University of Reading where most of this study was done. This work has been supported by the European Community contract SINTEX ENV4-CT98-0714.

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Gualdi, S., Guilyardi, E., Navarra, A. et al. The interannual variability in the tropical Indian Ocean as simulated by a CGCM. Climate Dynamics 20, 567–582 (2003). https://doi.org/10.1007/s00382-002-0295-z

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