N di o st rrd ib es utte io ins al fsoor sh tohwenw in hoFlieg ur seem5. i4a . rid part of the T ar rei ve idnife1r9 re 8d4 ). Rainfall tendencies for antecedence by fr oem xt ra m po oln at tihnsgtto he saepvpeartahleN rent yoepa rdeste icities into the future (Kane and Trivedi 1984). e rs r iod o ­ f

Another AGCM simulation of 1983 and 1984, using the UCLA AGCM, by Mechoso et dl. (1990) assessed the impact of the Pacific, Atlantic, and Indian oceans on precipitation over the Nordeste and asso­ ciated atmospheric circulation. The stream function and rotational wind anomalies results over South America and the South Atlantic for 1984 using SST anomalies only over the Atlantic Ocean compare well with the results using global SST anomalies. The pattern was the same found in Mechoso and Lyons 1988. Using only the Pacific SST anomalies, there were similarities with the results using global SST anomalies only near Indonesia and over the extreme west Pacific Ocean. When the Indian Ocean SST anomaly was considered, the similarities with the global SST anomaly results were observed over the Indian Ocean and equatorial Africa. The precipitation anomaly in 1984, using the global SST anomaly, showed enhanced precipitation over northeast Indonesia, a dipole of reduced precipitation over northern Brazil, and enhanced precipitation over the western Atlantic/eastern Nordeste. Using only the Atlantic SST anomalies, the precipitation anomalies were confined to the dipole over South America and

the Atlantic, but the positive values were weaker and shifted to the east. The dipole of reduced/enhanced precipitation was associated with the decreased moisture flux from the Atlantic Ocean to the northern part of South America and with the enhanced convergence of the southeast trade winds carrying moisture over the warmer South Atlantic. The model results showed an area of moisture flux divergence over northern Brazil and convergence over the Atlantic/eastern Nordeste, similar to the precipi­ tation anomaly pattern. The patterns of moisture flux and its convergence in 1983 were different. The flux was not well defined, as it was in 1984, and the moisture convergence was found over southeast Brazil. Analyses of remote effects on precipitation over the Nordeste show the influence of the Pacific and Indian Oceans. The sum of the results using Indian Ocean SST anomalies and Pacific SST anomalies showed the dipole of precipitation found when the global SST was used.