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

在日本本土以南1000公里处的小川滨岛建立了一个面向太平洋的观测站，建立了大气二甲基硫化物(DMS)、臭氧和氡的自动连续测量系统，并建立了数据通信系统来检查测量情况，几乎连续采集了一年的数据。我们小组成员每月前往小川岛10天，收集气溶胶和云凝结核(CCN)。这些样本在名古屋大学的实验室中进行了分析。此外，利用气象客观分析资料，进行等熵后向轨迹分析，寻找物质的来源。结果表明，即使在日本大陆和欧亚大陆以南100公里处，小河原Hahajima岛在冬季也受到大陆气团和/或人为物质的影响。海洋大气中CCN浓度与NSS-硫酸盐浓度之间存在较好的相关性。这种NSS-硫酸盐的前体可能是DMS，特别是在海洋气团下，以及人为的二氧化硫在大陆气团下。

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.