Trend analyses of intensity and duration of typhoons that influenced the korean peninsula during past 60 Years

摘要: The paper presents trend analyses of the past 60-year-data of intensity (central pressure) and duration of the typhoons that influenced the Korean Peninsula. The singular spectrum analysis was employed to extract the trends. The result of linear regression of the trend component shows that the intensity of typhoons is slightly increased. A long-term change with period of about 30 years was detected, and thus the original series were separated into two sub-periods of 30 years. For these sub-periods, normal and Gumbel distributions of central pressure and duration of typhoons were estimated. The results show that during the second sub-period the overall intensity of typhoon was increased but the occurrence of extreme typhoons remains unchanged. The duration also showed an obvious increase during the second sub-period.