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A pronounced decadal change of tropical cyclone (TC) activity was identified over western North Pacific (WNP) around late-1990s.After late-1990s,the WNP total TC genesis number exhibited an evident decrease,particularly over southern WNP region (S-WNP: 5°N-20°N),which was mainly caused by reduced relative vorticity and descending anomalies.We also detected a significant northward migration of TC genesis position from 17.2°N to 18.7°N.