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This study investigates the influences of the Pacific-Japan (P J) teleconnection pattern on synoptic-scale variability (SSV) in the Western North Pacific (WNP).The PJ pattern exhibits salient intraseasonal variations, with a dominant peak at 10-50 days.During positive PJ phases, strengthened SSV is found in the WNP, with a.much stronger and better-organized synoptic wave train structure.Such a synoptic-scale wave train, however, is greatly weakened during negative PJ phases.Examination of the vertical profiles of the observational data suggests that environmental parameters are generally more (less) favorable for the growth of synoptic disturbances under positive (negative) PJ conditions.