札幌市上空の垂直断面におけるエーロゾルの分布

概要

論文の詳細を見る
The vertical cross sections of the aerosol concentration and the temperature were studied over the Sapporo City in April 1980. The results in the present study are summarized as follows. The aerosol concentration was stationarily high over the central part of the city. And the polluted air in the central part was wafted up to the altitued of 1,200 m by the updrafts of 2 to 3 m/sec. The axes of these updrafts were found to be declined leeward by the environmental wind. To the leeward of these updrafts a compensating current, which consisted of upper clean air and penetrated downward along the axes of the updrafts, were always found. The tongue tip of such a clean air almost reached just above the ground surface. The temperature in the central part of the city was higher than that in the suburban part and a remarkable heat island was formed. The effect of heat island reached the altitude of 600 m. Above this altitude the temperature distribution became irregular in the central part of the city. A cross-over effect was found on the top of the updraft and the temperature in the updraft was lower than that in the environmental air. In most parts of the atmosphere measured, the potential temperature increased with the altitude. However an inversion of potential temperature was found near the surface of the central part and this superadiabatic stratification was considered as the driving force of the convection.
北海道大学の論文
1982-03-25