This study analyzed the climate regime shift using statistical change-point analysis on the time-series tropical cyclone (TC) frequency that affected Japan in July to September. The result showed that there was a significant change in 1995 and since then, it showed a trend of rapidly decreasing frequency. To determine the reason for this, differences between 1995 to 2012 (9512) period and 1978 to 1994 (7894) period were analayzed.
First, regarding TC genesis, TCs during the 9512 period showed a characteristic of genesis from the southeast quadrant of the tropical and subtropical western North Pacific and TCs during the 7894 period showed their genesis from the northwest quadrant. Regarding a TC track, TCs in the 7894 period had a strong trend of moving from the far east sea of the Philippines via the East China Sea to the mid-latitude region in East Asia while TCs in the 9512 period showed a trend of moving from the Philippines toward the southern part of China westward. Thus, TC intensity in the 7894 period, which can absorb sufficient energy from the sea as they moved a long distance over the sea, was stronger than that of 9512.
Large-scale environments were analyzed to determine the cause of such difference in TC activity occurred between two periods. During the 9512 period, anomalous cold and dry anticyclones were developed strongly in the East Asia continent. As a result, Korea and Japan were affected by the anomalous northerlies thereby preventing TCs in this period from moving toward the mid-latitude region in East Asia. Instead, anomalous easterlies (anomalous trade wind) were developed in the tropical western Pacific so that a high passage frequency from the Philippine to the south China region along the anomalous steering flows was revealed. The characteristics of the anomalous cold and dry anticyclone developed in the East Asia continent were also confirmed by the analysis of air temperature, relative humidity and sensible heat net flux showing that most regions in East Asia had negative values.

Abstract
 1. 서 론
 2. 자료 및 분석방법
  2.1. 자료
  2.2. 분석방법
 3. 월 변동
 4. 일본에 영향을 준 태풍빈도에 대한 통계적 시점변화 분석
 5. 9512기간과 7894기간의 차
  5.1. 태풍활동
  5.2. 종관규모 대기순환
 6. 요약 및 결론
 REFERENCE

• 최재원(국립기상연구소 정책연구과) | Choi Jae-Won (Policy Research Department, National Institute of Meteorological Research) Corresponding author
• 박기준(국립기상연구소 정책연구과) | Ki-Jun Park (Policy Research Department, National Institute of Meteorological Research)
• 이경미(국립기상연구소 정책연구과) | Kyungmi Lee (Policy Research Department, National Institute of Meteorological Research)
• 김정윤(국립기상연구소 정책연구과) | Jeoung-Yun Kim (Policy Research Department, National Institute of Meteorological Research)
• 김백조(국립기상연구소 정책연구과) | Baek-Jo Kim (Policy Research Department, National Institute of Meteorological Research)