북동아시아 연안해의 해양성 대기분진의 화학조성

Abstract

Input flux of lithogenic aerosol into the Northeast Asia Marginal Sea was high in the spring and winter seasons but low in the summer season. Especially, input of lithogenic aerosol over the East China Sea was very weak in the summer. Also, the input amounts of lithogenic aerosol gradually decreased in order of the Bohai Sea, the Yellow Sea and the East China Sea. Elements like Al, K, Ca, Ba, Sc, Cr, V, Mn, Co, Se, Rb, Sr, Y, Zr, Nb, Sn, Th, U and rare-earth group in aerosol particles mostly have their origin in the lithogenic materials. Sodium of aerosol in the North Eastern Asia is mostly derived from marine salts. But, in the spring season, about 50 % of Na in the aerosol collected the Bohai and Yellow Seas is originated in lithogenic source. Elements like Mg, K and Ca incoming into the Yellow and Bohai Seas are mostly lithogenic source. However, those of the East China Sea in summer time have their origin in marine salts. Trace metals like Ni, Cu, Zn As, Mo, Cd and Pb in marine aerosols inflow into the study area through anthropogenic processes such as burning of fossil fuel. Most of nitrate and ammonia in aerosol collected in the study area are originated from the burning of fossil fuel. Their input strength was the maximum in the winter and spring and the minimum in the summer season. Most of sulfates in the aerosol come from the industrial region located in Chinese east coast. It is inferred based on S/Ca ratios that aerosol originated in the desert of Chinese continental are transferred into the East China Sea passed by the Bohai and Yellow Seas. It is estimated that oceanic input of aerosol is the maximum in the Yellow Sea and is the minimum in the East China Sea. While the wet depositions of aerosol were not so much in the Bohai Sea where precipitation is lower, those in the Yellow Sea are relatively abundant because of the high rainfall.