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Paleoclimate studies based on speleothem records suggest that variation in insolation precession and ocean circulation plays an important role in controlling the moisture transport along the South Atlantic Convergence Zone (SACZ), causing abrupt rainfall redistribution over central Brazil. However, little is known about paleoclimate changes in regions directly affected by the SACZ close to its modern axis. In this study we present a novel paleoprecipitation reconstruction based on precisely dated O speleothem records from central-eastern covering the last 85 kyr. At orbital time-scale monsoon precipitation over central-eastern Brazil shows limited coupling with insolation forcing, except for the interval between 60 and 85 kyr BP. This feature is attributed to an additional forcing by the glacial boundary conditions that significantly influence the position and strength of the SACZ. On the other hand, during the last glacial, the precipitation variability over the eastern portion of the SACZ region was strongly modulated by millennial-scale climate oscillation recorded on high latitude areas of North Hemisphere. Particularly during the marine isotope stage 3, changes in monsoon precipitation near the axis of SACZ mimics abrupt oscillation pacing by the transition of Greenland stadial and interstadial events. During the wet stadial phases addition increments in the strength of South American monsoon precipitation over central-eastern Brazil show consistent patterns in terms of the timing and structure with the episodes of massive deposition of ice rafting debris in the North Atlantic. Our results suggest a farther southward displacement of the Intertropical

Atividade do Sistema de Monção Sul-americana na porção central do Brasil durante o último período glacial a partir da aplicação de isótopos de oxigênio em espeleotemas