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Paleoclimate observations and modeling studies suggest that extratropical climate change affects the tropical Pacific.A global coupled general circulation model is used to investigate the equatorial Pacific response to extratropical surface heat flux forcing that is downward (upward) poleward of 40°N (S).The equatorial response consists of two distinct stages: the zonal sea surface temperature (SST) gradient strengthens for the first 2-3 decades and then weakens afterwards.