大気汚染物質の海洋への輸送(そのI) : 日本列島北東部太平洋沿岸海上の凝結核と巨大海塩粒子の測定

概要

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Some processes are considered to be effective for the anthropogenic aerosols which are produced over the land and spread over the ocean. Especially the attachment of aerosol particles to the sea-salt particles is expected to be one of the most effective processes. With this view, the concentrations of the condensation nuclei and the giant sea-salt particles were measured along the Pacific coast of Japan aboard a coast linear. The results are summarized as follows : (1) Opaque residues were frequently found in the center of halos which were developed on the reagent film by the giant sea-salt particles. The residues were more frequently found in the samples obtained in the polluted air than in the clean air. This may be considered as evidence that the condensation nuclei attach to the giant sea-salt particles. (2) The concentration of condensation nuclei in the southern part of the coast course was about 7×10^3 particles/cm^3 and was one order higher than that in the northern part. The diffusional mean equivalent radius in the southern part was smaller than that in the northern part. (3) The size distribution of condensation nuclei was dependent upon the wind direction. The concentration of the small size particles (10^<-7><γ<1.5×10^<-6>cm) decreased when the wind blew from sea to land. This may be attributed to the coagulation of aerosol particles.
北海道大学の論文
1982-03-25