摘要
By performing a statistical change-point analysis of activities of the tropical cyclones(TCs)that have affected Korea(K-TCs),it was found that there was a signifi cant change between 1983 and 1984.During the period of 1984-2004(P2),more TCs migrated toward the west,recurved in the southwest,and affected Korea,compared to the period of 1965-1983(P1).These changes for P2 were related to the southwestward expansion of the subtropical western Pacifi c high(SWPH)and,simultaneously,elongation of its elliptical shape toward Korea.Because of these changes,the central pressure and lifetime of K-TC during P2 were deeper and longer,respectively,than fi gures for P1.This stronger K-TC intensity for P2 was related to the more southwestward genesis due to the southwestward expansion of the SWPH.The weaker vertical wind shear environment during P2 was more favorable for K-TC to maintain a strong intensity in the mid-latitudes of East Asia.
By performing a statistical change-point analysis of activities of the tropical cyclones(TCs)that have affected Korea(K-TCs),it was found that there was a signifi cant change between 1983 and 1984.During the period of 1984-2004(P2),more TCs migrated toward the west,recurved in the southwest,and affected Korea,compared to the period of 1965-1983(P1).These changes for P2 were related to the southwestward expansion of the subtropical western Pacifi c high(SWPH)and,simultaneously,elongation of its elliptical shape toward Korea.Because of these changes,the central pressure and lifetime of K-TC during P2 were deeper and longer,respectively,than fi gures for P1.This stronger K-TC intensity for P2 was related to the more southwestward genesis due to the southwestward expansion of the SWPH.The weaker vertical wind shear environment during P2 was more favorable for K-TC to maintain a strong intensity in the mid-latitudes of East Asia.
