Aerosol and cloud formation processes induced by sulfur compounds of marine biospherical origin

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An observation station facing the Pacific ocean was set up in Ogasawara Hahajima island by 1000 km south to main land of Japan.Constructing automatic continuous measurement system to measure atmospheric dimethylsulfide (DMS), ozone and radon, and data communication system to check the measurement condition, almost continuous data sampling for one year has been conducted. Members of our group went to Ogasawara Hahajima island for ten days each month and collected aerosols and cloud condensation nuclei (CCN). These samples were analyzed in laboratories at Nagoya university. In addition, using meteorological objective analysis data, isentropic backward trajectory analysis was carried out to look for the origins of the materials.It is concluded that, even at 100 km south to main land of Japan and Eurasian continent, Ogasawara Hahajima island undergoes influence of continental and/or anthropogenic materials under continental air mass in winter. There found a good correlation between concentration of CCN and nss-sulfate in the marine atmosphere. The precursors of this nss-sulfate would be DMS especially under maritime air mass, and anthropogenic sulfur dioxide under continental air mass.