著者

荒生 公雄 牧野 保美 永木 嘉寛

出版者

長崎大学教育学部

雑誌

長崎大学教育学部自然科学研究報告 = Science bulletin of the Faculty of Education, Nagasaki University (ISSN:0386443X)

巻号頁・発行日

vol.30, pp.65-74, 1979-02-28

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Yellow sand, that is, a heavy dust storm over the Far East is studied from a viewpoint of statistical and synoptic meteorology. Secular variation of annual number of days with yellow sand at Nagasaki is shown for the 62-year period between 1914 and 1975. The mean annual number of days is 5.3 days and 85 percent of them belong to spring. The travelling velocity of dust particles estimated from the surface observations in Japan islands almost corresponds to the westerly wind at an altitude of 4km. The size distribution of yellow sands collected at Nagasaki agrees with the power law distribution with the value of γ=3.0~3.5, where γ is the radius exponent defined by n(r)=Cr-γ.