On the Secular Change of the Climate in Japan (1 st report)

[摘要] 1. Secular change of the climate in Sakai on the Japan Sea coast of Chugoku District, Japan.(1) The climate of the period 1925 to 1946 (say the latter period) differs discontinuously from that of 1903 to 1924 (say the former period).(2) The duration of sunshine, the depth of deepest snowfall and the amount of evaporation are increasing, but, on the contrary, the humidity, the number of days without sunshine and that of stormy days are decreasing in the latter period than the former.(3) The increase of the duration of sunshine is largest in summer, and the decrease of humidity and the number of stormy days are largest in winter.2. Secular change of the climate in other parts of Japan.(1) The climate of all parts of Japan shows a change between these two periods.(2) The change of the duration of sunshine has a tendency to decrease in the sunnyregion along the Pacific coast and to increase in the cloudy region along the Japan Sea coast. The humidity has a tendency to increase in the low humidity region along the Pacific coast and to decrease in the high humidity region along the Japan Sea coast.

[学科分类] 大气科学