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Title: 日本各地におけるピナツボ火山噴火に伴う山本の混濁係数の変動
Other Titles: Variations of Yamamoto's Turbidity Coefficient over Japan before and after the Eruption of Mt. Pinatubo 1991
Authors: 荒生, 公雄 / 古賀, かすみ / 碇, 由紀子
Authors (alternative): Arao, Kimio / Koga, Kasumi / Ikari, Yukiko
Issue Date: 28-Feb-1994
Publisher: 長崎大学教育学部
Citation: 長崎大学教育学部自然科学研究報告. vol.50, p.9-18; 1994
Abstract: Atmospheric turbidity anomalies over Japan due to the volcanic erution of Mt. Pinatubo occurred on June 1991 were studied by the use of the pyrheliometric data of Japan Meteorological Agency. The turbidity coefficient (β) defined by Yamamoto et al. (1968) was evaluated for 14 stations and for 3 years from 1990 to 1992. In addition to the monthly mean value of β, the low mode value of β which is defined as the moderate value between the minimum and the median, and the high mode vaule as the moderate value between the maximum and the median were taken into account for estimating the monthly anomalies of atmospheeric turbidity. The results can be sammarized as follows. (1) The most severe influence of the stratospheric volcanic dust appeared in spring 1992 at almost all stations in Japan. (2) The extremes of the monthly anomalies were as high as the level of ⊿β=0.12~0.15, which are significantly greater than those estimated at the E1Chichon event during the years 1982-1983(⊿β=0.08~0.11). (3) Since the maximums were observed almost in the same months both at southern stations and northern stations, it is suggested that the stratospheric dust cloud spreaded meridionally at a high velocity.
URI: http://hdl.handle.net/10069/32208
ISSN: 0386443X
Type: Departmental Bulletin Paper
Text Version: publisher
Appears in Collections:No. 50

Citable URI : http://hdl.handle.net/10069/32208

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