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  • Bombardi, R. J., and L. M. V. Carvalho, 2010: The South Atlantic dipole and variations in the characteristics of the South American Monsoon in the WCRP-CMIP3 multimodel simulations. Climate Dynamics. In press.

This study investigates relationships between the Atlantic sea surface temperature (SST) and the variability of the characteristics of South American Monsoon System (SAMS), such as the onset dates and total precipitation over central eastern Brazil. The observed onset and total summer monsoon precipitation are estimated for the period 1979-2007. SST patterns are obtained from Empirical Orthogonal Function. It is shown that variations in SST on interannual timescales over the South Atlantic Ocean play an important role in the total summer monsoon precipitation. Negative (positive) SST anomalies over topical South Atlantic along with positive (negative) SST anomalies over extratropical South Atlantic are associated with early (late) onsets and wet (dry) summers over southeastern Brazil and late (early) onset and dry (wet) summers over northeastern Brazil. Simulations from Phase 3 of the World Climate Research Programme Coupled Model Intercomparison Project (CMIP-3) are assessed for the 20th century climate scenario (1971-2000). Most CMIP3 coupled models reproduce the main modes of variability of the South Atlantic Ocean. GFDL2.0 and MIROC-M are the models that best represent the SST variability over South Atlantic. On the other hand, these models do not succeed in representing the relationship between SST and SAMS variability

Last Updated: 2010-07-23

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