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長崎地方における1914年から2001年までの黄砂現象の経年変化


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Title: 長崎地方における1914年から2001年までの黄砂現象の経年変化
Other Titles: Secular Variation of Yellow Sand Dust Events over Nagasaki in Japan: 1914~2001
Authors: 荒生, 公雄 / 伊東, 和博 / 古謝, 愛
Authors (alternative): Arao, Kimio / Itou, Kazuhiro / Koja, Ai
Issue Date: 31-Jan-2003
Citation: 長崎大学総合環境研究 5(1), p.1-10; 2003
Abstract: Yellow sand dust events (Kosa in Japanese) are very interesting phenomena on the viewpoint both of the atmospheric aerosol optical properties and their various influences on the global warming processes. The dates on which the yellow sand dust events have been observed at the Nagasaki Marine Observatory of the Japan Meteorological Agency were tabulated for 88 years from 1914 to 2001. Since the City of Nagasaki (33°N, 130°E) is located at the western seashore on the Kyushu Island, it is the nearest place to the Asian continent from Japan within a distance of 1000km. The purpose of this study is to reveal the secular variation of the dust events for providing a fundamental data concerning the atmospheric aerosols and the global environmental studies. The main results in this study are as follows. (1) The mean number of days of the yellow sand dust event at Nagasaki for the period of 88 years was 6.1 days per year, although it showed a large fluctuation year by year. (2) A significant maximum number of days of the dust event in the interval of ten days was 91 days/88 years in the middle of April. (3) The number of days of the dust event in recent years has increased in March and April, and decreased in May. This feature is very interest from the viewpoint of an influence of the global warming.
URI: http://hdl.handle.net/10069/5413
ISSN: 13446258
Type: Departmental Bulletin Paper
Appears in Collections:Volume 5, No. 1

Citable URI : http://hdl.handle.net/10069/5413

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