In this paper,dynamic linkage of air-sea coupling between the North and tropicalPacific is demonstrated with a large number of ensemble perturbed initial conditionsexperiments in a fully coupled fast ocean-atmosphere model (FOAM).In the FOAMmodel,an idealized mixed layer warming is initiated in the Kuroshio-Oyashioextension region,while the ocean and atmosphere remain fully coupled both locallyand elsewhere.The modeling results show that the warm anomalies are associatedwith anomalous cyclonic winds,which induce initial warming anomalies extendingdownstream in the following winter.Then,the downstream warming spreadssouthwestward and induces SST warming in the equatorial Pacific via surfacewind-evaporation-SST feedback.Warming in the tropical Pacific is further reinforcedvia Bjerknes’s feedback.