Precipitating Snow Clouds during Winter Monsoon Seasons Influenced by Topography of the Shakotan Peninsula, Hokkaido Island, Japan (SHAROP)

概要

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The radar observations carried out on the Shakotan Peninsula, Hokkaido, Japan, indicated that the direction of movement of the precipitation echoes from snow clouds invading from the northwest to southeast had a tendency to shift towards the east, by about 10 degrees near the mountainous regions, when compared to the echoes over the center of the Ishikari Bay. This tendency was the same as in the case of the echoes from the north-northwest to south-southeast. It was considered, therefore, that the tendency seemed to reflect the influence of the mountainous regions. To estimate the topographical effect of the mountains around the peninsula, numerical experiments using Lavoie's mesoscale model were carried out. The experiments indicated also that the wind direction in a mixed layer shifted eastward by about 10 degrees near the mountainous regions to the west of the Ishikari Plain as compared to that in the center of the Ishikari Bay. Considering the fact that radar echoes of precipitating snow clouds move along the mean wind direction in the mixed layer, this result agrees well with the radar observations. It is expected therefore that the results obtained by this study will provide valuable informations for the nowcasting of snowfall in the Ishikari Plain including Sapporo City.
北海道大学の論文
1987-08-20