Dynamic climatology of precipitation around Japan with attention to the daily precipitation systems in relation to the seasonal cycle of large-scale climate systems

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Seasonal cycle of the precipitation climatology and its year-to-year variation around the Japan were analyzed, with special attention to appearance tendency of the daily precipitation systems and effects of the phase differences in the seasonal march among the large-scale Asian monsoon subsystems near Japan. The present study reveals that the Baiu precipitation has decreased after~ 2000 in the northwestern Kyushu, where the heavy rainfall events frequently appear climatologically, greatly reflected by the decrease in the heavy rainfall days. The detailed features on the rainfall characteristics in the "Aki-Same"(autumn rainfall) season, long-term change of the wintertime precipitation, and evolutions of the precipitation and the synoptic-scale systems during late autumn~ midwinter~ early spring have also been found.