著者

佐々倉 航三

出版者

静岡県地学会

雑誌

静岡地学 = Shizuoka Chigaku (ISSN:02850753)

巻号頁・発行日

vol.4, pp.19-23, 1965-10-20

著者

佐々倉 航三

出版者

The Association of Japanese Geographers

雑誌

地理学評論 (ISSN:00167444)

巻号頁・発行日

vol.38, no.9, pp.572-578, 1965-09-01 (Released:2008-12-24)

参考文献数

7

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都市気候の一環として都市の内外における湿度差が論ぜられるが,東京付近においてはその差は概ね5%ぐらいであり,その原因は主として郊外の方に水張が大きいことにあることを明かにした.また都心における湿度の経年変化が80年間に6% ぐらい低落したことを示し,その原因が主として都心における気温の経年上昇にあることを明かにした.

著者

佐々倉 航三

出版者

公益社団法人 日本地理学会

雑誌

地理学評論 (ISSN:00167444)

巻号頁・発行日

vol.8, no.3, pp.203-213, 1932

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Last year the harvest was poor in every district in Japan, especially in the Northeastern district of the Mainland and in Hokkaid&ocirc;. The total rice yield in the Northeastern district and Hokkaid&ocirc; is estimated as only onehalf that of normal years. There may be several causes of the poor harvest, such as typhoon, droughts, etcRI believe the poor harvest of the last year was due to low temperatures and reduced hours of sunshine. I have drawn 12 climatic maps based on data recorded in the Monthly Bulletin of the Central Meteorological Observatory, Tokyo.<br> From Figs. 7 and 8 we can easily understand that the climatic couditions that prevailed during June and July, 1931, were very unfavorable for the rice crop. The zones of -2.0 C and below it as the mean deviation of air temperature during June and July and those of -10% and below it as the mean deviation of sunshine percentage during June and July, are Aomori and Iwate Prefectures and Hokkaido. These zones correspond to the districts where the rice harvest was very poor.<br> I think that the reasons for low temperatures and lesser sunshine in Japan during June and July last year are as follows: As we can see in Fig. II, the center of the anticyclone in June was situated in the Okhotsk Sea, its barometric reading being above 761mm. Usually in June the anticyclone occupies the offing of the Sanriku district, resulting in the rainy season in Japan : but last year the center of the anticyclone migrated farther northwards and cold air was brought in by north-easterly winds.<br> During July last year the distribution of air pressure resembled that of ordinary years, but the weak high pressure zone still remained in the Okhotsk Sea, and that as many as twenty-five cyclones visited Japan, so that dull weather prevailed during nearly the whole of July. The original cause of the unfavorable climate was undoubtedly the abnormal high pressure that prevailed over the Okhotsk Sea during June last year.