AAAR 34th Annual Conference
October 12 - October 16, 2015
Hyatt Regency
Minneapolis, Minnesota, USA
Abstract View
Characteristics and Major Sources of Carbonaceous Aerosols in PM2.5 from Sanya, China
JINGZHI WANG, Steven Sai Hang Ho, Junji Cao, Rujin Huang, Jiamao Zhou, Youzhi Zhao, Hongmei Xu, Suixin Liu, Gehui Wang, Zhenxing Shen, Yongming Han, Institute of Earth Environment, Chinese Academy of Sciences
Abstract Number: 257 Working Group: Carbonaceous Aerosols in the Atmosphere
Abstract PM2.5 samples were collected in Sanya, China in summer and winter in 2012/2013. Organic carbon (OC), elemental carbon (EC), and non-polar organic compounds including n-alkanes (n-C14-n-C40) and polycyclic aromatic hydrocarbons (PAHs) were quantified. The concentrations of these carbonaceous matters in winter generally were higher than in summer. The estimated secondary organic carbon (OCsec) accounted for 38% and 54% of the total organic carbon (TOC) in winter and summer, respectively. The higher value of OCsec in summer proves that photochemical conversions of organics are much active at the higher air temperatures and with stronger intense solar radiation. Calculations of carbon preference index (CPI) and percent contribution of wax n-alkanes suggest that anthropogenic sources were more dominant than derivation from terrestrial plants in this tourist city. Diagnostic ratios of atmospheric PAHs indicate that there was a wide mix of pollution sources in winter while fossil fuel combustion was the most dominant in summer. Positive Matrix Factorization (PMF) analysis for 18 PAHs in the winter samples show that motor vehicle emissions and biomass burning were the two main pollution sources, contributing 37.5% and 24.6% of the total quantified PAHs, respectively.