Journal of the Korean earth science society (한국지구과학회지)

The Korean Earth Science Society (한국지구과학회)
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Regime Shift of the Early 1980s in the Characteristics of the Tropical Cyclone Affecting Korea

  • Choi, Ki-Seon (National Typhoon Center/Korea Meteorological Administration) ;
  • Kim, Tae-Ryong (National Typhoon Center/Korea Meteorological Administration)
  • Received : 2011.07.21
  • Accepted : 2011.09.18
  • Published : 2011.09.30
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Abstract

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 North Pacific high (SWNPH) 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 SWNPH. 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.

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References

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