Interdecadal variation of Korea affecting TC activity in early 1980s

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• 作者：Jae-Won Choi ; Yumi Cha ; Jeoung-Yun Kim
• 关键词：Change ; point analysis ; Tropical cyclone ; Korea ; Shift ; Vertical wind shear
• 刊名：Geoscience Letters
• 出版年：2017
• 出版时间：December 2017
• 年：2017
• 卷：4
• 期：1
• 全文大小：1762KB
• 刊物类别：Earth Sciences, general; Atmospheric Sciences; Geophysics/Geodesy; Oceanography; Planetology; Biogeo
• 刊物主题：Earth Sciences, general; Atmospheric Sciences; Geophysics/Geodesy; Oceanography; Planetology; Biogeosciences;
• 出版者：Springer International Publishing
• ISSN：2196-4092
• 卷排序：4

文摘

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 significant 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 Pacific 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 figures 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.