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The InterTropical Convergence Zone (ITCZ) delivers intense precipitation for the tropical regions of the globe. The Australian tropics receives ~80% of its annual mean rainfall in the wet season (November-April), influenced by the arrival of the Australian Summer Monsoon (ASM) as the ITCZ moves south of the equator. Northern Australian rainfall projections are uncertain due to a paucity in understanding the ITCZ dynamics, the ITCZ/ASM relationship, and the large internal variability of these climatic phenomena. This study explores Central-Indo-Pacific (CIP) ITCZ dynamics, using a new set of indices that better capture the ITCZ intensity, latitudinal width, centre and southern edge positions (S edge); and by using the Sr/Ca record measured in a speleothem collected from Katherine, Northern Territory, Australia. Over the instrumental period, increases in ASM intensity and rainfall are correlated with southward latitudinal movements of the southern ITCZ edge (r = -0.71, -0.73 respectively ....