Characterization and Source Apportionment of Submicron Aerosols at a Regional Site in Pearl River Delta of China Using an Aerodyne High-Resolution Aerosol Mass Spectrometer
Submicron aerosol particles (PM1) were sampled and measured in Heshan, a regional site downwind of Guangzhou megacity in Pearl River Delta (PRD) of South China, using an Aerodyne High-Resolution Time-of-Flight Aerosol Mass Spectrometer (HR-ToF-AMS) in November 2010, during the time of 2010 Guangzhou Asian Games. The mean measured PM1 mass concentration was 68.7∮23.6 冚g m-3 during the campaign, with organic aerosol (OA) and sulfate being the two dominant species, accounting for 41.9％ and 28.8％, respectively. The diurnal cycles of OA, sulfate, nitrate and ammonium all rise to high peaks at morning and dusk due to transport of traffic emissions from upwind Guangzhou city. The average size distributions of the species were mainly dominated by an accumulation mode peaking at 500~600 nm. Calculations based on high-resolution organic mass spectra show that on average, C, H, O and N contributed 58.1, 7.3, 30.7, and 3.9％ to the total organic mass, respectively. The average OM/OC ratio was 1.73∮0.08. The Van Krevelen diagram of OA yielded a significant anti-correlation (R2=0.70) between H/C and O/C, with a slope of -0.96.
Chemical composition Diurnal variation Organic aerosols Regional transport HR-ToF-AMS
Z.-H. Gong L.-Y. He X.-F. Huang Z.-J. Lan L. Xue L.-W. Zeng
Key Laboratory for Urban Habitat Environmental Science and Technology,School of Environment and Energy,Peking University Shenzhen Graduate School,Shenzhen 518055,China
国际会议
西安
英文
801-808
2011-08-17（万方平台首次上网日期，不代表论文的发表时间）