長岡における積雪観測資料(14)(1989.11〜1990.4)

概要

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An observation of the weather and measurements of the snow depth on the ground, the water equivalent of snow cover, the depth of newly deposited snow and its density were carried out in a period from November 1989 to April 1990 at the observation field of the Nagaoka Institute of Snow and Ice Studies, which was situated at 37°25′N, 138°53′E and 97 m above sea level. The observation and the measurements were made daily at 9 : 00 a.m. coinciding with the official meteorological observation time. The snow depth was measured with an automatic snow depth meter by the infrared technique and the depth of newly deposited snow by the snow board method. The water equivalent of snow cover was measured with a metal wafer. The water equivalent of newly deposited snow was obtained from the weight of a cake of snow cut out, using a plastic cylinder of the known section area (50 cm^2), from the newly deposited snow on the snow board. The density of newly deposited snow was calculated from the depth and the weight of the "cake" of snow. The largest snow depth in the season was 113 cm, which recorded the 6th smallest value, and the cumulative depth of newly deposited snow was 378 cm, which recorded the 4th smallest value since the observation started in December, 1964, respectively.
独立行政法人防災科学技術研究所の論文
1990-10-18