应环境变化与地表过程重点实验室康世昌研究员的邀请, 台湾中央研究院环境变化研究中心副研究员許世傑博士前来青藏高原研究所交流并作学术报告。  

　　报告题目：Long-Range Transport of Eolian Dust Observed in Taiwan: East Asian versus Non-East Asian Sources 

　　讲 座 人：許世傑 博士      

　　主 持 人：康世昌 研究员 

　　地    点： 中国科学院青藏高原研究所 办公楼915会议室 

　　时    间： 2014年3月29日(星期六)   10:00-12:00  

　　简    介： 

　　During March 20-23, 2010, East Asia witnessed the largest dust storm ever recorded in the region, resulting in Al concentrations up to 50 μg/m3 at PCY (Pengchiayu, an offshore island, 25.62°N, 122.07°E; 100 m a.s.l.) on March 21 and 22. However, this dust event was not eminent at MLL (Mt. Lulin, 23.47°N, 120.87°E; 2862 m a.s.l.) where the time series of Al showed more pronounced peaks on March 10-11 and 26-27 instead. It is noteworthy that Al concentration at MLL correlated strongly with 7Be, a cosmogenic radionuclide that is often used as a tracer for air masses downwelled from lower stratosphere-upper troposphere. The source and transport pathway of the dust observed at MLL were investigated with a multitude of approaches including trajectory clustering, CALIPSO lidar, model simulation and isotope analyses for aerosol provenance. All results support that eolian dust collected at MLL primarily originated from North Africa and Middle East, rather than East Asia, and was transported mainly in the free troposphere by the Westerlies. Source apportionment by the MATCH model showed that East Asian dust is significant only in a very restricted area in the northwestern Pacific but it contributes little to the North Pacific dust deposition. Our 87Sr/86Sr and εNd(0) data clearly indicate that the MLL and PCY dust samples have vastly different provenances, with the MLL samples resembling those measured in northeast Africa and the PCY samples carrying isotopic signatures of East Asian dusts.  

　　許世傑博士，台湾中央研究院环境变化研究中心副研究员，研究兴趣主要集中于气溶胶理化性质、传输和沉降过程，以及微量元素同位素应用于大气污染源解析等研究。发表SCI研究论文60余篇。 

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