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我が国の降水特性の長期変化Long-term Variation in Rainfall Characteristics of Japan

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Long-term Variation in Precipitation Characteristics of Japan

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WShigenobu TANAKA

This study investigates characteristics of recent extreme precipitation in Japan with not only AMS(Annual Maximum Series) but POT(Peaks Over Threshold(100mm)) of daily precipitation at 155 meteorological observatories. Outcomes revealed that most rainfall stations show slight decrease trend in annual precipitation but slight increase in annual maximum daily precipitation. Average of all rainfall stations in Japan is in significantly increasing trend. Events exceeding 100mm/day is significantly increasing in 1901-2013 while 1940-2013 is in just slight increase. Even in 1940-2013, the largest 50th rainfall in Japan shows significant and steady increase. These results show the importance of POT analysis against AMS one. This method would be also useful for not only observation data but GCM data.

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