Multi-centennial hydroclimate shifts of Southeastern Brazil hydroclimate in response to North Atlantic cooling events over the past 7,500 years

New high-resolution trace element records combining stalagmites from Southeastern Brazil (SEBRA) evidence persistent multi-centennial shifts in hydroclimate conditions over the past 7,500 years, with wet anomalies associated with North Atlantic cooling events, including Bond events and the Little Ice Age (LIA). Our analysis reveals a coupling between the Bond events and increased South Atlantic Convergence Zone (SACZ) rainfall over SEBRA, with a persistent pattern over the Middle and Late Holocene. The most pronounced wet anomalies in SEBRA are synchronous with these events, and present a coherent structure with other records from the South American Summer Monsoon (SASM) region and the SACZ, and are in antiphase with Southern Brazil (SB) resembling the multi-centennial dipole between SEBRA and SB. This pattern indicates that large-scale reorganizations of the Intertropical Convergence Zone (ITCZ) are induced by North Atlantic cooling and a strengthened SASM/SACZ convection through changes in cross-equatorial heat transport related to a weakening of the AMOC. Furthermore, the interhemispheric antiphase relationship between SEBRA wet anomalies and drying across the Asian monsoon region evidences the global expression of AMOC–ITCZ modulation under North Atlantic cooling events. These findings demonstrate the pronounced response of SEBRA hydroclimate to even modest perturbations in the interhemispheric energy balance, evidencing the sensitivity of the region towards potential impacts under AMOC weakening scenarios.