报告题目：Primary and Secondary Organic Aerosol Tracers and their Use in Source Apportionment（大气中一次及二次有机气溶胶示踪物的分析与源解析）
报告人：Prof. Jianzhen Yu，Department of Chemistry & Division of Environment，Hong Kong University of Science & Technology
报告时间：2011年3月31日15:00-16:00
报告地点：中国科学院大气物理研究所铁塔分部LAPC多媒体会议室

报告摘要：

PM2.5 aerosol samples were collected in Hong Kong during the summer of 2006. The major inorganic constituents and organic tracer compounds in PM2.5 were quantified and used in positive matrix factorization (PMF) and chemical mass balance (CMB) models to apportion the primary and secondary source contributions to organic carbon (OC). Secondary organic aerosol (SOA) tracers of several biogenic and anthropogenic hydrocarbons were included in the PMF analysis. Their inclusion allowed the identification of two components of SOA among seven factors resolved by PMF. One SOA component was mainly associated with secondary sulfate and nitrate. The other SOA component, characterized by biogenic SOA tracers and mixed with biomass burning and vegetative detritus particles, was biomass burning-induced SOA. Secondary OC (SOC) apportioned by PMF (SOCPMF) was on average 6.84 ？gC m-3 (65% of PM2.5 OC) on high pollution days under influence of significant regional transport (i.e., regional days) and 0.70 ？gC m-3 (25% of PM2.5 OC) on days under the influence of mainly local emissions (i.e., local days). The biomass burning-induced SOA accounted for 20% of the total SOA on the regional days, underlining the importance of biomass burning aerosol source in this region. Good correlations between contributions of SOC and individual primary OC sources apportioned by PMF and CMB further added to the credence to the PMF-derived estimation of secondary and primary OC source contributions by using secondary and primary aerosol organic tracers as the fitting species.